JP2001156820A - Communication network, node device, transmission control method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication network, a node device, a transmission control method and a communication network capable of preventing unnecessary traffic from being added to a communication network and preventing the existence of communication in which the communication band is reduced. Provide equipment. After a signal input to a communication network and arriving at a destination terminal is input to the communication network, control is performed such that the signal passes through a switch 251 at least twice and does not go around the communication network one or more times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication network, a node device, and a transmission control method and device.

[0002]

2. Description of the Related Art In recent years, with the increase in the amount of information, a communication network system in which node devices are connected by a parallel multiplex transmission line has been studied in order to cope with a high-speed and large-capacity communication network connecting terminal devices. An example of the configuration of such a communication network system is disclosed in, for example, JP-A-8-17.
2394 or JP-A-8-237306.

Prior to the description of the present invention, a reference example in which a part of the configuration of Japanese Patent Application Laid-Open No. 8-237306 is used to clarify the features of the present invention is shown below. Also, as a problem of this reference example, a decrease in the communication band when performing communication with a terminal to which a packet can reach after passing through a switch at least once has been described.
The solution described in 182468 will be described.

FIG. 16 is a block diagram showing a configuration of a node device in a communication network of a reference example. FIG. 16 shows an example in which a plurality of terminals are connected to the node device via a sub-transmission line. I have.

In FIG. 16, reference numeral 1600 denotes a node device;
Reference numerals 1601 to 1608 denote terminal signal insertion units which are insertion means, and these are terminals 1651 to 16 to be described later.
It has a function of inserting a packet input from the packet 58 into a packet stream input from parallel multiplex transmission lines 1621 to 1628 to be described later.

Reference numerals 1611 to 1618 denote buffers serving as buffer means, which temporarily store packets output from the terminal signal insertion units 1601 to 1608 in a storage area corresponding to an output terminal of a switch 1641 described later. It has the function to do. Also, 1621 to 162
Reference numerals 8 and 1631 to 1638 denote parallel multiplex transmission lines in which a plurality of channels for connecting the node devices are provided in parallel, such as a plurality of spatially separated optical fiber transmission lines. Alternatively, it may be a wavelength division multiplexed transmission line that is wavelength-division multiplexed on one optical fiber.

Reference numeral 1641 denotes a switch which is controlled by a switch control unit 1642 to be described later, and is connected to the input terminal IN1.
To IN8 to any output terminal OUT1 to OUT8
It is connected to OUT8. The switch 1641 is
Parallel multiplex transmission lines 1621 to 1628 and 1631 to 16
In the case where a plurality of optical fiber transmission lines are used for 38, replacement is performed using a space switch or the like. When wavelength multiplex transmission lines are used for the parallel multiplex transmission lines 1621 to 1628 and 1631 to 1638, the transmission unit including a plurality of variable wavelength laser diodes and a multiplexer is wavelength A switch is configured between the node devices by connecting to a multiplex transmission line and separating each wavelength by a demultiplexer at a receiving unit of the wavelength multiplex transmission line, and a transmission wavelength of the variable wavelength laser diode is set to a wavelength λ1 to λ8. Exchange is performed by setting to an arbitrary wavelength.

Reference numeral 1642 denotes a switch control unit, for example, a switch 1 according to a control pattern shown in FIG.
641. Reference numeral 1643 denotes a buffer control unit. The input terminals IN1 to IN8 of the switches 1641 connected to the buffers 1611 to 1618 are connected to the desired output terminals OU.
When connected to T1 to OUT8, the buffer 1611
1618 to read out the stored packet. Reference numerals 1651 to 1658 denote terminals. Also, reference numerals 1661 to 1668 denote terminal signal separation units serving as separation means.
Detects the addresses of the packets input from 1 to 1628, and transmits the packets to the terminals 1651 to 1658 via the sub-transmission path and the packets to be input to the buffers 1611 to 1618 via the terminal signal insertion units 1601 to 1608. It has the function of separating.

FIG. 17 is a block diagram showing the internal configuration of the terminal signal separation units 1661 to 1668 in FIG. 16. In FIG. 17, reference numeral 1701 denotes a header detection unit which detects a destination address from a packet header. . 1
Reference numerals 702 and 1703 denote first and second gates for outputting or blocking an input signal.

[0010] In the terminal signal separation units 1661 to 1668, the headers of the packets input from the parallel multiplex transmission lines 1621 to 1628 are detected by the header detection unit 1701. Open / close processing is performed.

[0011] The header detecting section 1701 has a terminal 1 previously connected to the terminal signal separating sections 1661 to 1668.
If the addresses 651 to 1658 are stored and the detected destination address matches the stored address, the second gate 1703 is opened and the first gate 1701 is opened.
2 is closed and the packet is output only to the terminals 1651 to 1658. If the detected destination address does not match the stored address, the first gate 1702 is opened and the second gate 1703 is closed to output the packet to only the terminal signal insertion units 1601 to 1608. The packets output to terminal signal insertion sections 1601 to 1608 are sent to buffers 1611 to 1618 via terminal signal insertion sections 1601 to 1608.

FIG. 18 is a block diagram showing the internal configuration of the terminal signal insertion units 1601 to 1608 in FIG. 16. In FIG. 18, reference numeral 1801 denotes a header detection unit which detects a destination address from a packet header. . 1
A selector 802 outputs one of two input signals. 1803 is FIFO (First)
In First Out), the packet is temporarily stored.

[0013] Terminal signal insertion sections 16701 to 1608 temporarily store packets transmitted from terminals 1651 to 1658 in FIFO 1803. At the same time, the header of the packet stream input to the selector 1802 from the terminal signal separation units 1661 to 1668 is detected. If there is a gap in the packet stream, the packet is read from the FIFO 1803 and passed through the selector 1802 to the buffer 1611.
１６1618. Terminal signal insertion unit 16
The header detection unit 1801 of the terminals 701 to 1608 and the header detection unit 1701 of the terminal signal separation units 1661 to 1668 can be shared.

FIG. 19 shows the structure of the buffer 161 in FIG.
FIG. 2 is a block diagram showing the internal configuration of a switch memory 161-1816.
It comprises storage areas (1) to (8) corresponding to 41 output terminals OUT1 to OUT8. A header detection unit 1902 detects a destination address from a packet header. An address counter 1903 supplies a write address to the buffer memory 1901.

In the buffers 1611 to 1618, the headers of the packets input from the terminal signal insertion units 1601 to 1608 are detected by the header detection unit 1902.
The storage area for storing the packet is determined based on the content of the detected header. The header detector 1902 includes:
The address of the terminal connected to the adjacent downstream node device is stored in advance, and if the detected destination matches the stored address, the transmission path to which the terminal is connected, that is, the switch 1641 is connected. Output terminal OUT
A storage area corresponding to (1) to OUT (8) is designated, a write address is generated by the address counter 1903, and the write address is stored in the buffer memory 1901. Also,
If the detected destination does not match the stored address, control is performed so that the packet is stored in an arbitrary storage area.

FIG. 20 is a diagram showing a control pattern of the input / output connection relation of the switch 1641. In FIG. 20, the input / output connection relation of the switch 1641 is changed by control addresses A1 to A8. Input terminals IN (1) to IN (8)
Are buffers 1611 to 1618 (input channels 162
1-1628), and the output terminals OUT (1)-
OUT (8) (or transmission wavelengths λ1 to λ8) correspond to channels 1631 to 1638. Switch 164
1 and the buffers 1611 to 1618 are controlled synchronously,
For example, when the buffer 1611 is connected to the channel 1631, the buffer 1611
The packet stored in the storage area (1) corresponding to 31 is read. Also, the buffer 1611 is
When the packet is connected to the storage 32, the packet stored in the storage area (2) corresponding to the channel 1632 is read from the buffer 1611.

FIG. 21 shows the node device 16 shown in FIG.
FIG. 1 is a diagram illustrating a configuration example of a communication network system using a communication system 00. The communication network system includes four node devices 2101 to 2104 in a parallel multiplex transmission path 2105.
To 2108, each node device 2
Each of 101 to 2104 has eight terminals 211 to 2118 and terminals 2121 to 2 via eight sub transmission paths.
128, terminals 2131 to 2138, terminals 2141 to 21
48 are connected. Terminals 2111 to 2118 correspond to terminals 1651 to 1658 in FIG.
121 to 2128, terminals 2131 to 2138, terminal 21
41 to 2148 also correspond to the terminals 1651 to 1658 in FIG.

FIG. 22 is a diagram for explaining the communication principle of the communication network system shown in FIG. 21. In FIG. 22, reference numerals 2201 to 2204 denote node devices and reference numerals 2205 to 2205.
2208 is an exchange switch corresponding to the switch 1641;
Buffers 2209 to 2212 are buffers 1 in FIG.
611 to 1618. 2221-2236
Is a terminal, and A, B, C, and D are parallel transmission lines forming a ring.

First, the communication principle of this communication network will be described with reference to FIG.

This communication network has a plurality of parallel transmission lines A to D forming a ring, and the parallel transmission lines A to D are connected to each other by switching switches 2205 to 2208. The terminals 2221 to 2236 are connected to the parallel transmission paths A to
When communication is performed with a terminal connected to one of the parallel transmission lines D and connected to another parallel transmission line, communication is performed at least once by switching to another parallel transmission line by an arbitrary switching switch. Is performed. The location where the exchange takes place is not specified,
Communication control is facilitated by switching to a destination parallel transmission line at a node device immediately before the destination node device and switching to an arbitrary parallel transmission line at another node device.

In order to simplify the node device in this communication network, the exchange switches 2205 to 2208 change the input / output connection relationship in accordance with a predetermined pattern and by repeating the pattern irrespective of the input signal.
When the input signals are temporarily stored in 209 to 2212 and the input / output connection relation of the exchange switches 2205 to 2208 becomes a desired relation, the exchange is performed by reading the packets from the buffers 2209 to 2212.

For example, when communication is performed from the terminal 2222 to the terminal 2232, the packet output from the terminal 2222 is stored in the buffer 2209 of the node device 2201.
For example, when the input terminal IN2 of the exchange switch 2205 is connected to the output terminal OUT2, the input terminal IN2 is read from the buffer 2209 and output to the parallel transmission line B, and the node device 220
2 to the buffer 2210 and exchange switch 2206
Is read from the buffer 2210 when the input terminal IN2 and the output terminal OUT4 are connected, the packet is output to the parallel transmission line D and sent to the terminal 2232.

As described above, each node device 220
Communication is performed by switching to any one of the parallel transmission lines A to D at 1 to 2204.

Next, the details of the communication network will be described with reference to FIGS. In the description, the parallel multiplex transmission line will be described as a plurality of spatially separated optical fiber transmission lines, and the switch will be described as a space switch.However, even when a wavelength multiplex transmission line is used, it is based on the communication principle described above. A similar operation is performed. An example of the operation when communication is performed from the terminal 2112 to the terminal 2135 in FIG. 21 will be described.

The transmission data from the terminal 2112 is divided into fixed-length packets, and the destination address is described in the header of each packet and output. The output packet is
The signal is input to the node device 2101 through the sub transmission path, and is temporarily stored in the FIF 1803 of the terminal signal insertion unit 1602. The packet stored in the FIFO 1803 is read from the FIFO 1803 when there is a gap in the packet flow input from the terminal signal separation unit 1662 to the selector 1892, and sent to the buffer 1612 through the selector 1802.

Header detector 1902 of buffer 1612
When detecting the header of the input packet, since the detected destination address does not match the stored address, it is determined that the packet does not specify a channel, and an arbitrary storage area is specified. Address counter 19
03 generates a write address in response to the information,
The packet is written into the storage area of the buffer memory 1901. Here, it is assumed that data is temporarily stored in the storage area (1). The buffer control unit 1643 includes the switch 16
Until the input terminal IN2 of 41 is connected to the output terminal OUT1, reading of the packet is made to wait, and when connected, the packet is read.

The switch control section 1642 stores the control addresses in A1, A2, A3, A as shown in the table of FIG.
4, A5, A6, A7, and A8 are sequentially supplied to change the connection relation of the switch 1641 and to control addresses A1 to A1.
By supplying A8 in, for example, one packet length cycle,
Control is performed so that the same pattern is repeated every eight packets. By notifying the information to the buffer control unit 1643, the timing of reading from the buffer 1612 is controlled. Here, the input terminal IN of the switch 1641
2 is connected to the output terminal OUT1, the buffer 16
When the packet is read from the twelve storage areas (1), the packet is output to the transmission line 1631 through the switch 1641.

The packet output to the transmission line 1631 is
The packet is input to the terminal signal separation unit 1661 of the node device 2102, and the header of the packet is detected by the header detection unit 1701. Since the detected destination address does not match the stored address, the first gate 1702 is opened,
The second gate 1703 is closed to output the packet to the terminal signal insertion unit 1601. The packet output to the selector 1802 of the terminal signal insertion unit 1601 is
The data is input to the buffer 1611 through 802.

When the header detection unit 1902 detects the header of the input packet, the detected destination address matches the stored address, so that this packet is a packet to be output on the specified channel. And specifies the storage area corresponding to the transmission path to which the terminal at the destination address is connected. Here, since the destination terminal is connected to the transmission line 1635, it is stored in the storage area 5. The buffer control unit 1643 reads a packet from the storage area 5 of the buffer 1611 when the input terminal IN1 of the switch 1641 is connected to the output terminal OUT5,
The packet is output to the transmission line 1635 through the switch 1641. Then, the header of the packet input to the terminal signal separating unit 1665 of the node device 2103 via the transmission line 1635 is detected by the header detecting unit 1701,
Since the detected destination address matches the stored address, the second gate 1703 is opened and the first gate 1
702 is closed, and the packet is output only in the terminal direction. The packet output from terminal signal separation section 1665 in the terminal direction is sent to terminal 2135 through the sub-transmission path and received.

Communication is performed in this manner.

Subsequently, in the above communication network,
In the case of performing communication with a terminal to which a packet can reach if the packet passes through the switch 1641 at least once, a communication band becomes narrower than communication with a terminal to which a packet cannot reach unless the packet passes through the switch 1641 at least twice. The problem will be described in detail below.

First, using FIGS. 16 to 21, at least 1
A procedure for transmitting a packet to a terminal to which the packet can reach after passing through the switch 741 will be described. In this description, similar to the above description, the parallel multiplex transmission line is composed of a plurality of spatially separated optical fiber transmission lines and a switch 741.
Is described as a space switch. However, the use of a wavelength division multiplexing transmission line is also based on the above-described communication principle, so that substantially the same operation is performed and the same problem occurs.

Here, the terminal 2112 to the terminal 2125
An example of the operation in the case of transmitting to the server will be described.

The transmission data from the terminal 2112 is divided into fixed-length packets, and the destination address is described in the header of each packet and output. The output packet is input to the node device 2101 through the sub transmission path, and is temporarily stored in the FIFO 1803 of the terminal signal insertion unit 1602. The packet stored in the FIFO 1803 is read from the FIFO 1803 when there is a gap in the packet flow input to the selector 1802 from the terminal signal separation unit 1662, and is sent to the buffer 1612 through the selector 1802.

The header detector 1902 of the buffer 1612
Detects the header, since the detected destination address matches the stored address, specifies the storage area corresponding to the transmission path to which the terminal of the destination address is connected. Here, since the destination terminal is connected to the transmission line 1635, the packet is stored in the storage area 5.

The switch control section 1642 stores the control addresses in A1, A2, A3, and A as shown in the table of FIG.
4, A5, A6, A7, and A8 are sequentially supplied to change the connection relationship of the switch 1641 and to supply the control address in, for example, one packet length cycle so that the same pattern is repeated in eight packet cycles. Controlling. By notifying the information to the buffer control unit 1643, the timing of reading from the buffer 1612 is controlled.

The buffer control unit 1643 includes a switch 164
When the first input terminal IN2 is connected to the output terminal OUT5, the packet is read from the storage area 5 of the buffer 1612, and is output to the transmission line 1635 through the switch 1641. Then, the header of the packet input to the terminal signal separating unit 1665 of the node device 2102 through the transmission line 1635 is detected by the header detecting unit 1701, and the detected destination address matches the stored address. 2 Open gate 1703 and
The gate 1702 is closed to output the packet only toward the terminal. The packet output from the terminal signal separation unit 1665 in the terminal direction passes through the sub-transmission path and is transmitted to the terminal 2125.
Sent to and received.

In this way, the terminal 2112 to the terminal 21
Communication to 25 is performed.

However, in this procedure, as described below, there is a problem that a communication band becomes narrower than a terminal to which a packet cannot reach unless the packet passes through the switch 1641 at least twice.

First, at least two times the switch 1641
Let's calculate the communication bandwidth with the terminal that cannot reach the packet without passing through. The transmission bandwidth per transmission line is Tb
ps, and the transmission band of the sub-transmission path between the terminal and the node device is also Tbps. As described above, the terminal 2112
When calculating as communication from the terminal 2135 to the terminal 2135, (1) the communication speed from the terminal 2112 to the node device 2101 is Tbps. (2) The communication speed from the terminal signal insertion unit 1602 to the buffer 1612 is Tbps. (3) In the buffer 1612, the packet is written to an arbitrary storage area, and the storage areas 1 to 8 are stored in the buffer control unit 164.
3, the buffer 1612
The communication speed from the switch to the switch 1641 is Tbps. Therefore, the output from the switch 1641 is also Tbps (however,
As a total of eight transmission lines). (4) The communication speed from the node device 2101 to the node device 2102 is Tbps (however, as a total of eight transmission paths). (5) The terminal signal separation units 1661 to 1661 of the node device 2102
The communication speed between 1668 and the buffers 1611 to 1618 is Tbps (however, as a total of eight transmission paths). (6) In the buffers 1611 to 1618, the packets are written in the respective storage areas 5, and the respective storage areas 5 are sequentially read out at different timings by the buffer control unit 1643.
The communication speed from 8 to the switch 1641 is Tbps. (7) The switch 1641 reads packets from the input terminals IN1 to IN8 at different timings and outputs the packets to the output terminal OU.
Since it is connected to T5, the communication speed is Tbps. Therefore,
The output from the switch 1641 is also Tbps (however, the transmission path is only 1635). (8) The communication speed from the node device 2102 to the node device 2103 is Tbps (however, one transmission line). (9) The communication speed between the terminal signal separation unit 1665 and the terminal 2135 of the node device 2103 is Tbps.

Therefore, the communication speed is Tbps in all communication paths.
Therefore, the communication band from the terminal 2112 to the terminal 2135 is Tbps.

On the other hand, the terminal 2112 to the terminal 21
Calculating as communication to 25: (1) The communication speed from the terminal 2112 to the node device 2101 is Tbps. (2) The communication speed from the terminal signal insertion unit 1602 to the buffer 1612 is Tbps. (3) In the buffer 1612, the packet is written into the storage area 5, and the storage area 5 of the buffer 1612 is read out once every eight packet periods by the buffer control unit 1643. The communication speed between them is Tbps. Therefore, the output from the switch 1641 is also Tbps. (4) The communication speed from the node device 2101 to the node device 2102 is Tbps (however, there is one transmission path). (5) The communication speed from the terminal signal separation unit 1665 to the terminal 2125 of the node device 2102 is Tbps.

Therefore, the above (3) is the bottleneck (T /
8 bps), and the communication band for communication from the terminal 2112 to the terminal 2125 is T / 8 bps.

Subsequently, the above-mentioned "at least once switch 164"
In the case of performing communication with a terminal to which a packet can reach by passing through 1, the communication band is narrower than communication with a terminal to which a packet cannot reach without passing through the switch 1641 at least twice. As a means, a solution described in Japanese Patent Application No. 9-182468 will be described.

In Japanese Patent Application No. Hei 9-182468, the shortest is 1
When transmitting a packet to a terminal that can reach the packet via the switch, the ring-shaped network must be connected to one terminal.
The packet is made to pass through a route that goes around. Thereby, when the transmitting terminal first passes through the switch of the connected node device, it becomes possible to send a packet to a downstream node device through an arbitrary transmission line of the parallel transmission line, and thus the communication band is narrowed. Problem can be solved.

When a packet is transmitted to a terminal to which the packet can reach after passing through the switch at least once so as to enable the above-described circuit path, a non-separable bit is set in the header of the packet. . A packet in which a non-separation bit is set in the header is transmitted to a downstream node device through an arbitrary transmission channel after first passing through a switch, and the downstream node device receiving the packet must separate the packet into a destination terminal. , The non-separation bit is invalidated and sent to the next node device.

By such processing, separation is not performed when a packet arrives for the first time, and separation can be performed at the time of next arrival after one round of the ring network.

[0048]

The above-mentioned conventional communication network has the following problems. (1) When transmitting a packet to a terminal connected to an adjacent downstream node device, the switch must be switched only once. Not to go through
The communication band decreases.

(2) In order to solve the problem (1), when transmitting a packet to a terminal connected to an adjacent downstream node device, the packet should be routed so as to make a round of the ring communication network. (Japanese Patent Application No. 9-18246
No. 8), since the signal passes through the switch twice or more, the communication band is not reduced, but the packet passes through a route that does not need to pass the packet, and unnecessary traffic is added to the communication network. .

(3) When sending a packet to a receiving terminal connected to the same node device as the node device to which the transmitting terminal is connected, the packet does not reach the receiving terminal unless it makes one round of the communication network. This will be described in further detail. For example, in FIG. 21, when a packet is to be transmitted from the terminal 2112 to the terminal 2114, the packet input to the node device 2101 is transmitted to the node device 2102, 2103, 210
4, 2101 and is delivered to the terminal 2114. As described above, even when a packet is transmitted to a receiving terminal connected to the same node device as the transmitting device connected to, the packet cannot be transmitted only within the node device. Or the transmission delay increases.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a communication network and a node in which unnecessary traffic is not added and a communication band is prevented from being reduced and transmission delay is not caused. An apparatus and a transmission control method and apparatus are provided.

[0052]

According to one aspect of the present invention, there is provided a communication network, comprising: a plurality of channels; and a plurality of channels connected to the plurality of channels and input from each of the plurality of channels. A switch for outputting in any one of the channels, a terminal connected to the plurality of channels, first separating means for separating only a specific signal from the plurality of channels, and a first separating unit. First insertion means for inserting the specific signal separated by the means into a channel to which the first separation means is connected, wherein the plurality of channels are connected in a ring shape via the switch. A communication network constituting a parallel ring transmission path, wherein a signal input to the communication network and reaching a destination terminal is:
After being input to the communication network, there is provided control means for controlling so as to pass through the switch at least twice and not to go around the communication network more than once.

[0053] In order to achieve the above object, a second aspect is provided.
2. The communication network according to claim 1, wherein the first separation unit is provided in the plurality of channels connected to the output side of the switch, and the plurality of channels connected to the input side of the switch are further provided. Characterized in that said first insertion means is provided in said channel.

Further, in order to achieve the above object, a third aspect is provided.
3. The communication network according to claim 1, wherein the signal (loopback instruction information) is capable of determining whether or not a specific signal should be separated from the plurality of channels by the first separation unit. ) Is added to the loopback instruction information adding means.

Further, in order to achieve the above object, a fourth aspect is provided.
The communication network according to claim 3, wherein the first separating unit includes a loopback instruction information detecting unit that detects the loopback instruction information, and the loopback instruction information is For the added signal, the first separating means separates the signal from the plurality of channels, and the separated signal is further connected to the first separating means by the first inserting means. Characterized in that it is inserted into a channel that

Further, in order to achieve the above object, the present invention is applied to claim 5.
The communication network according to claim 1, wherein the terminal is connected to the plurality of channels via a second separation unit,
The second separating unit separates a signal to be output to a terminal from signals transmitted on a channel to which the second separating unit is connected, from the channel, and outputs the signal to the terminal. .

According to another aspect of the present invention, there is provided a computer system comprising:
The communication network according to claim 1, wherein the information (terminal signal) capable of determining whether or not a specific signal is to be separated from the plurality of channels by the second separation unit into the signal is used in the communication network according to claim 1. A terminal signal non-separation instruction information adding means for adding non-separation instruction information).

Further, in order to achieve the above object, the present invention provides a seventh aspect.
7. The communication network according to claim 6, wherein the second separation unit includes a terminal signal non-separation instruction information detecting unit that detects the terminal signal non-separation instruction information, Is characterized in that, of the signals transmitted on the channel to which the second separating means is connected, the signal to be output to the terminal is separated from the channel and output to the terminal.

Further, in order to achieve the above-mentioned object, the present invention provides an eighth aspect.
8. The communication network according to claim 6, wherein the second separation unit includes an information deletion unit that deletes the loopback instruction information and the terminal signal non-separation instruction information. I do.

[0060] In order to achieve the above object, a ninth aspect is provided.
The communication network according to claim 6, wherein the switch is a signal that can reach a destination terminal by passing through the switch once after being input to the communication network. If the terminal signal non-separation instruction information is added, the signal is output to any one of the plurality of channels.

Further, in order to achieve the above-mentioned object, the first aspect is described.
0 is a communication network according to claims 6 to 8 or 9
The communication network according to claim 1, wherein the switch is a signal that can reach the destination terminal after passing through the switch one more time and that does not include the terminal signal non-separation instruction information. It is characterized by outputting on a channel to which a terminal is connected.

Further, in order to achieve the above object, the first aspect
The communication network according to claim 1, wherein
0, the switch comprises:
A buffer that stores signals input from the plurality of channels and separately outputs the signals for each input channel, and connects the output for each channel from the buffer to the plurality of channels from which the switch outputs a signal And a switching unit for switching between.

Further, in order to achieve the above object, the first aspect is described.
12. The communication network according to claim 2, wherein the switch has output channel variable means provided in correspondence with each output from the buffer for each channel, and By switching the output channel of the means, the output of each input channel and the connection of the output channel are switched.

Further, in order to achieve the above object, the first aspect is described.
13. The communication network according to claim 11, wherein the switching between the output for each channel from the buffer and the output channel is performed according to a predetermined pattern and a plurality of outputs for each channel from the buffer. Are not simultaneously connected to the same output channel.

Further, in order to achieve the above object, the first aspect is provided.
A communication network according to a fourth aspect is the communication network according to any one of the first to eleventh or twelfth aspects, further comprising a second insertion unit that inserts a signal into the plurality of channels.

Further, in order to achieve the above object, a first aspect is provided.
5. The communication network according to claim 5, wherein:
The communication network according to claim 1, further comprising a node device provided with the switch, the first and second separating units, and the first inserting unit.

Further, in order to achieve the above-mentioned object, a first aspect is provided.
A communication network according to a sixth aspect of the present invention is the communication network according to the fifteenth aspect, wherein a second insertion unit that inserts a signal into the plurality of channels is provided in the node device.

Further, in order to achieve the above object, the first aspect is provided.
7. The communication network according to claim 7, wherein a plurality of node devices for connecting a plurality of terminals are connected in a ring shape by a plurality of channels, and at least one switch for transferring packets between the channels is provided. And a first separating unit that separates a specific packet from the plurality of channels out of the output of the switch, and connects the specific packet separated by the first separating unit to an input of the switch. And a first insertion unit that inserts into the channel to which the first separation unit is connected among the plurality of channels, and connects to a downstream node device adjacent to a node device to which a transmitting terminal that transmits a packet is connected. When a packet is sent to a receiving terminal connected to the same node device as the node device connected to the receiving terminal or the transmitting terminal transmitting the packet. Packet transmitted from the transmitting terminal, via said switches, be further separated from the plurality of channels in said first separating means, further, the first
Is inserted into the plurality of channels by the insertion means, and then transmitted to the receiving terminal.

Further, in order to achieve the above object, the first aspect
8. The communication network according to 8, wherein a plurality of node devices for connecting a plurality of terminals are connected in a ring shape by a plurality of channels, wherein the node devices include:
A switch for switching a packet input on the plurality of channels and outputting the packet on any one of the plurality of channels, and separating a specific packet among the packets output from the switch from the plurality of channels First separating means, and second separating means for separating a packet to be output to a connected terminal from the channels among packets transmitted through the plurality of channels,
A first insertion unit for inserting the specific packet separated by the first separation unit into an input of the second separation unit connected to the same channel as a channel to which the first separation unit is connected; And loop-back instruction information required for separating the packet by the first separating means, and terminal signal non-separating instruction information required for not separating the packet by the second separating means. Characterized in that it has information adding / deleting means for adding or deleting a packet to or from a packet.

Further, in order to achieve the above object, the first aspect is described.
9. The node device according to item 9, wherein the node device is used in a communication network in which a plurality of node devices for connecting a plurality of terminals are connected in a ring with a plurality of channels.
A switch for switching a packet input on the plurality of channels and outputting the packet on any one of the plurality of channels, and separating a specific packet among the packets output from the switch from the plurality of channels A first separating unit, a second separating unit that separates a packet to be output to a connected terminal among the packets transmitted through the plurality of channels from the plurality of channels, First inserting means for inserting the separated specific packet into an input of the second separating means connected to the same channel as the channel to which the first separating means is connected, and further comprising: The loopback instruction information required for separating the packet by the first separating unit and the not separating the packet by the second separating unit Characterized in that it has information adding / deleting means for the terminal signal unseparated instruction information as a principal or deleted added to the packet.

Further, in order to achieve the above object, a second aspect is provided.
0, a plurality of channels, a switch connected to the plurality of channels, and a signal for outputting a signal input in each channel through any one of the plurality of channels; A terminal connected to a channel of the switch, first separating means for separating a specific signal among the outputs of the switch from the plurality of channels, and separating the specific signal separated by the first separating means into the switch. The first of the plurality of channels connected to the input;
And a first insertion unit for inserting into a channel to which the separation unit is connected, wherein the plurality of channels is a signal transmission control method in a communication network configured as a ring via the switch. After the signal input to the communication network and transmitted through the channel and reaching the destination terminal is input to the communication network, the signal passes through the switch at least twice and does not go around the communication network at least once. It is characterized in that control is performed so as to reach the destination terminal.

Further, in order to achieve the above object, a second aspect is provided.
21. The transmission control method according to claim 20, wherein, in the transmission control method according to claim 20, information (a loopback instruction) capable of determining whether or not to separate the specific signal from the plurality of channels by the first separation unit into the signal. Information).

Further, in order to achieve the above object, a second aspect is provided.
22. The transmission control method according to claim 2, wherein the first separating unit includes a loopback instruction information detecting unit that detects the loopback instruction information, wherein the loopback instruction information detecting unit detects the loopback instruction information. For the signal to which the instruction information has been added, the first separating means separates the signal from the plurality of channels, and further separates the separated signal by the first inserting means. Is inserted into the channel connected thereto, and the signal is controlled to pass through the switch again.

Further, in order to achieve the above object, a second aspect is provided.
3. The transmission control method according to claim 3, wherein
In the transmission control method described above, the terminal is connected to the plurality of channels via a second separation unit, and the second separation unit transmits on a channel to which the second separation unit is connected. It is characterized in that control is performed such that a signal to be output to the terminal is separated from the channel and output to the terminal among the signals thus output.

Further, in order to achieve the above object, a second aspect is provided.
24. The transmission control method according to claim 23, wherein, in the transmission control method according to claim 23, information (terminal signal non-terminal) capable of determining whether or not to separate a specific signal from the plurality of channels by the second separating unit into the signal. (Separation instruction information).

Further, in order to achieve the above object, a second aspect is provided.
The transmission control method according to claim 5, wherein in the transmission control method according to claim 24, the second separating unit includes a terminal signal non-separating instruction information detecting unit that detects the terminal signal non-separating instruction information, The second separating unit includes, among signals transmitted through a channel to which the second separating unit is connected,
A signal to be output to the terminal is controlled so as to be separated from the channel and output to the terminal.

Further, in order to achieve the above object, a second aspect is provided.
26. The transmission control method according to claim 26, wherein the second separation unit has a step of deleting the loopback instruction information and the terminal signal non-separation instruction information. And

Further, in order to achieve the above object, a second aspect is provided.
7. The transmission control method according to claim 7, wherein
In the transmission control method described above, after the switch is input to the communication network, even if the signal can reach a destination terminal once through the switch, the terminal signal non-separation instruction information is added. If so, control is performed so as to output to any one of the plurality of channels.

Further, in order to achieve the above object, a second aspect is provided.
8. The transmission control method according to claim 8, wherein
7. The transmission control method according to 7, wherein the switch transmits a signal that can reach the destination terminal after passing through the switch one more time and the terminal signal non-separation instruction information is not added to the signal among the plurality of channels. The output is performed on a channel to which the destination terminal is connected.

Further, in order to achieve the above object, a second aspect is provided.
9. The transmission control method according to claim 9, wherein
8. The transmission control method according to claim 8, wherein the switch stores a signal input from each of the plurality of channels, and separately outputs the signal for each of the input channels; Has a switching unit that switches the connection with the plurality of channels that output signals, and switches between the output for each channel from the buffer and the output channel according to a predetermined pattern and the channel from the buffer. The output is performed so that a plurality of outputs for each output are not connected to the same output channel at the same time.

In order to achieve the above object, a third aspect is provided.
0, the transmission control method according to claim 20.
10. The transmission control method according to claim 9, wherein the input of the signal to the communication network is performed by inserting a signal into the channel by a second insertion unit provided in the channel.

In order to achieve the above object, a third aspect is provided.
2. The transmission control device according to claim 1, further comprising: a plurality of channels; a switch connected to the plurality of channels and configured to output a signal input in each channel through any one of the plurality of channels; A terminal connected to a channel of the switch, first separating means for separating a specific signal among the outputs of the switch from the plurality of channels, and separating the specific signal separated by the first separating means into the switch. The first of the plurality of channels connected to the input;
And a first insertion unit that inserts into a channel to which the separation unit is connected, wherein the plurality of channels are signal transmission control devices in a communication network configured in a ring shape via the switch. After the signal input to the communication network and transmitted through the channel and reaching the destination terminal is input to the communication network, the signal passes through the switch at least twice and does not go around the communication network at least once. It has a control means for controlling so as to reach the destination terminal.

Further, in order to achieve the above object, a third aspect is provided.
32. The transmission control apparatus according to claim 31, wherein the information (loopback instruction) that can determine whether or not the first signal is separated from the plurality of channels by the first separation unit. ) To add loopback instruction information.

In order to achieve the above object, a third aspect is provided.
33. The transmission control device according to claim 3, wherein the first separation unit includes a loopback instruction information detection unit that detects the loopback instruction information, wherein the first separation unit includes the loopback instruction information detection unit. For the signal to which the instruction information has been added, the first separating means separates the signal from the plurality of channels, and further separates the separated signal by the first inserting means. Is inserted into the channel connected thereto, and the signal is controlled to pass through the switch again.

In order to achieve the above object, a third aspect is provided.
4. The transmission control device according to claim 4, wherein
5. The transmission control device according to claim 1, wherein the terminal is connected to the plurality of channels via a second separation unit, and the second separation unit transmits on the channel to which the second separation unit is connected. It is characterized in that control is performed such that a signal to be output to the terminal is separated from the channel and output to the terminal among the signals thus output.

In order to achieve the above object, a third aspect is provided.
The transmission control device according to claim 5, wherein the signal (terminal signal non-terminal) that can determine whether or not to separate a specific signal from the plurality of channels by the second separation unit into the signal. Terminal signal non-separation instruction information adding means for adding separation instruction information).

In order to achieve the above object, a third aspect is provided.
6. The transmission control device according to claim 6, wherein the second separation unit has a terminal signal non-separation instruction information detection unit that detects the terminal signal non-separation instruction information, The second separating unit includes, among signals transmitted through a channel to which the second separating unit is connected,
A signal to be output to the terminal is controlled so as to be separated from the channel and output to the terminal.

Further, in order to achieve the above object, a third aspect is provided.
7. The transmission control device according to claim 7, wherein the second separation unit has an information deletion unit that deletes the loopback instruction information and the terminal signal non-separation instruction information in the transmission control device according to claim 35 or 36. It is characterized by.

In order to achieve the above object, a third aspect is provided.
8. The transmission control device according to claim 8, wherein
In the transmission control device described above, after the switch is input to the communication network, the terminal signal non-separation instruction information is added even if the signal can reach a destination terminal if the signal passes through the switch once. If so, control is performed so as to output to any one of the plurality of channels.

In order to achieve the above object, a third aspect is provided.
The transmission control device according to claim 9, wherein
8. The transmission control device according to 8, wherein the switch is a signal that can reach the destination terminal after passing through the switch one more time, and the signal to which the terminal signal non-separation instruction information is not added is the signal out of the plurality of channels. The output is performed on a channel to which the destination terminal is connected.

[0091] In order to achieve the above object, a fourth aspect is provided.
0, the transmission control device according to claim 31 or claim 38.
10. The transmission control device according to claim 9, wherein the switch is configured to store a signal input from each of the plurality of channels and output the signal separately for each of the input channels; Has a switching unit that switches the connection with the plurality of channels that output signals, and switches between the output for each channel from the buffer and the output channel according to a predetermined pattern and the channel from the buffer. The output is performed so that a plurality of outputs for each output are not connected to the same output channel at the same time.

Further, in order to achieve the above object, a fourth aspect is provided.
The transmission control device according to claim 1, wherein
0, wherein the input of a signal to the communication network is performed by inserting a signal into the channel by a second insertion unit provided in the channel.

Further, in order to achieve the above object, a fourth aspect is provided.
2. The transmission control method according to item 2, wherein a plurality of node devices for connecting a plurality of terminals are connected in a ring shape by a plurality of channels, and a switch for transferring a packet between the plurality of channels is provided in at least one place. A first separating unit that separates a specific packet from the plurality of channels out of the output of the switch; and the specific packet separated by the first separating unit is connected to an input of the switch. A packet transmission control method in a communication network, comprising: a first insertion unit that inserts into a channel to which the first separation unit is connected among the plurality of channels, wherein a transmission terminal that transmits a packet is connected. The receiving terminal connected to the downstream node device adjacent to the node device or the transmitting node transmitting the packet is connected to the same node device as the connected node device. When transmitting a packet to a receiving terminal, the packet transmitted from the transmitting terminal passes through the switch, is further separated from the plurality of channels by the first separating means, and further includes the first inserting means. Wherein the control is performed such that the signal is transmitted to the receiving terminal after the first separating means is inserted into the connected channel.

Further, in order to achieve the above object, a fourth aspect is provided.
3. The transmission control device according to 3, wherein a plurality of node devices for connecting a plurality of terminals are connected in a ring shape by a plurality of channels, and a switch for transferring a packet between the plurality of channels is provided in at least one place. A first separating unit that separates a specific packet from the plurality of channels out of the output of the switch; and the specific packet separated by the first separating unit is connected to an input of the switch. A packet transmission control device in a communication network, comprising: a first insertion unit that inserts into a channel to which the first separation unit is connected, among the plurality of channels, wherein a transmission terminal that transmits the packet is connected. The receiving terminal connected to the downstream node device adjacent to the node device or the transmitting node transmitting the packet is connected to the same node device as the connected node device. When transmitting a packet to a receiving terminal, the packet transmitted from the transmitting terminal passes through the switch, is further separated from the plurality of channels by the first separating means, and further includes the first inserting means. And a control means for controlling the first separating means to be transmitted to the receiving terminal after being inserted into the connected channel.

[0095]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the first embodiment of the present invention will be described.
An embodiment will be described with reference to FIGS. This embodiment relates to a communication network.

FIG. 1 is a diagram showing the structure of a packet used in the communication network of the present invention. As shown in the figure,
The packet includes a header 101 and data 102.

In FIG. 1, "A" is terminal signal non-separation instruction information, and "B" is loopback instruction information. The operation of each unit in the node device for both bits of the terminal signal non-separation instruction information A and the loopback instruction information B will be described later in detail, but will be briefly described here.

The terminal signal non-separation instruction information A is 1 bit, and is “1” when the terminal signal separation unit of the node device to which the destination terminal of the packet is connected does not separate the packet, and “1” when the destination terminal is connected. When a packet is separated by the terminal signal separation unit of a certain node device, it is represented by “0”. The loopback instruction information B is 1 bit, and is “0” when the packet is not separated by the loopback signal separation unit of the node device, and is “1” when the packet is separated by the loopback signal separation unit of the node device. Is represented by

In FIG. 1, "N" is a node number, and if it is possible to connect 32 node devices, it is composed of 5 bits indicating node numbers 1 to 32.
T is a transmission channel number. If the number of transmission channels (the number of multiplexes) of the parallel multiplex transmission path is 8, the transmission channel number is composed of 3 bits indicating transmission channel numbers 1 to 8. Also,
In "Other", a synchronization signal, an error correction code, and the like are inserted as necessary. Each terminal in the communication network is individually identified by a node number and a transmission channel number.

In the present embodiment, each terminal in the communication network is connected to the separation / insertion unit on a one-to-one basis, and one separation / insertion unit is provided for each channel in each node device. . To identify multiple separate inserts,
It is only necessary to know which node device is connected to which channel. Therefore, in the present embodiment, terminals are individually identified by node numbers and transmission channel numbers.

FIG. 2 is a diagram showing a configuration of a node device used in the communication network according to the first embodiment of the present invention. In the figure, an input / output port P for connecting to four terminals via a transmission line such as a twisted pair cable is shown.
Four node input terminals IN (1) to IN (1) to connect the ORT (1) to PORT (4) and the node devices of the present invention via a parallel transmission line such as a multi-core optical fiber cable.
(4) and four node output terminals OUT (1) to OUT (1)
4 shows a configuration of a node device having (4).

In FIG. 2, reference numerals 201 to 204 denote node input terminals IN (1) for inputting signals from parallel transmission lines.
ＩＮIN (4), and includes an optical receiver for converting an optical signal into an electric signal. This optical receiver performs not only photoelectric conversion, but also clock extraction, decoding of a transmission path encoded signal, and the like.

Reference numerals 211 to 214 denote loopback signal insertion units, reference numerals 221 to 224 denote terminal signal separation units, and reference numerals 231 to 234.
Is a terminal signal insertion unit, 241 to 244 are buffers, 251
Is a switch, 252 is a switch control unit, 253 is a buffer control unit, and 261 to 264 are loopback signal separation units. Reference numerals 271 to 274 denote node output terminals OUT (1) to OUT (4) for outputting signals to the parallel transmission lines, and include an optical transmitter for converting an electric signal to an optical signal. This optical transmitter performs transmission path coding and the like in addition to electro-optical conversion. Reference numerals 281 to 284 denote terminal signal input / output ports PORT (1) to PORT (4) for connecting terminals via a twisted pair cable or the like. Each of these ports PORT 281 to PORT 284 is constituted by a circuit for transmission and a circuit for reception.

Loopback signal insertion units 211 to 214
Has a function of inserting a packet input from the loopback signal separation units 261 to 264 into a packet stream transmitted from the node input terminals IN201 to IN204.

FIG. 3 shows loopback signal insertion units 211 to 211.
FIG. 3 is a block diagram showing the internal configuration of 214, in which 301 is a header detection unit which detects a destination address from the header of the packet. A selector 302 outputs one of two input signals. 303 is a FIFO (First In First)
In (Out), the packet is temporarily stored. The loopback signal insertion units 211 to 214 temporarily store the packets transmitted from the loopback signal separation units 221 to 224 in the FIFO 303. At the same time, the header of the packet stream input to the selector 303 from the node input terminals IN201 to IN204 is detected. When there is a gap in the packet stream, the packet is read from the FIFO 303 and passed through the selector 303 to the terminal signal separation unit 221. ~
224.

Terminal signal separation sections 221 to 224 detect the headers of the packets input from loopback signal insertion sections 211 to 214, and output terminal signal input / output ports 281 to 2
The packet is separated into a packet to be transmitted to the terminal side via 84 and a packet to be input to buffers 241 to 244 described later via terminal signal insertion units 231 to 234 described later.

FIG. 4 is a block diagram showing the internal configuration of terminal signal separation sections 221 to 224. In FIG.
Reference numeral 1 denotes a header detection unit for detecting terminal signal non-separation instruction information A and node number N from a packet header. 402 to 405 are first to fourth gates for outputting or cutting off an input signal. Reference numeral 406 denotes a loopback instruction information deletion processing unit which performs a loopback instruction information deletion process. Reference numeral 407 denotes a terminal signal non-separation instruction information deletion processing unit which deletes terminal signal non-separation instruction information.

In FIG. 4, loopback signal insertion section 2
Packets input from 11 to 214 are output to the header detection unit 4
01, the terminal signal non-separation instruction information A and the node number N are detected from the header, and the first gate 40
Opening / closing processing of the second to fourth gates 405 is performed. The loopback instruction information deletion processing unit 406 performs a deletion process of rewriting the loopback instruction information B of the header from “1” to “0”. Also, terminal signal non-separation instruction information deletion processing section 407
Then, a deletion process of rewriting the terminal signal non-separation instruction information A in the header from “1” to “0” is performed.

The header detection unit 401 stores the node number of the own node device (hereinafter, referred to as own node number) in advance.

The header detector 401 detects (1) when it detects that the detected node number N matches the stored own node number and that the terminal signal non-separation instruction information A is “1”; , The third gate 404 is opened, and the first gate 402, the second gate 403, and the fourth gate 404 are opened.
The gate 405 is closed, the terminal signal non-separation instruction information deletion processing unit 407 rewrites the terminal signal non-separation instruction information A in the header to “0”, and outputs the rewritten packet to the terminal signal insertion units 231 to 234.

(2) When it is detected that the detected node number N does not match the stored own node number and that the terminal signal non-separation instruction information A is "1", the second gate 403 And the first gate 402 and the third gate 4
04 and the fourth gate 405 are closed, the loopback instruction information deletion processing unit 407 rewrites the loopback instruction information B of the header to “0”, and further, the terminal signal non-separation instruction information deletion processing unit 407 outputs the terminal signal of the header. Non-separation instruction information A
Is rewritten to “0”, and the rewritten packet is output to terminal signal insertion units 231 to 234.

(3) When it is detected that the detected node number N matches the stored own node number and that the terminal signal non-separation instruction information A is "0", the fourth gate 405 is turned off. Open, first gate 402, second gate 40
The third and third gates 404 are closed to output packets only in the terminal direction.

(4) In cases other than the above (1) to (3),
The first gate 402 is opened, and the second gate 403 and the third gate 403 are opened.
The gate 404 and the fourth gate 405 are closed, and the packet is output only to the terminal signal insertion units 231 to 234.

In this way, the route of the packet is controlled.

FIG. 5 is a flow chart showing the flow of the operation for controlling the path of the packet. The header of the packet input in step S501 is detected.
Next, in step S502, it is determined whether or not the node number N detected in step S501 matches the stored own node number. If it is determined that the node number N does not match the own node number, the process proceeds to step S
The process proceeds to step S 503, and if it is determined that the node number N matches the own node number, the process proceeds to step S 505.

In step S503, it is determined whether or not the detected terminal signal non-separation instruction information A is "1". If it is determined that the terminal signal non-separation instruction information A is “1”, the process proceeds to step S504, where both the loopback instruction information B and the terminal signal non-separation instruction information A are “0”.
After that, the process proceeds to step S507. If it is determined in step S503 that the terminal signal non-separation instruction information A is not “1”, the process proceeds to step S50.
Skip to step S507 and proceed to step S507.

At step S507, terminal signal insertion section 2
After outputting the packets to 31 to 234, the present processing operation ends.

On the other hand, if it is determined in step S502 that the node number N does not match the own node number, the flow advances to step S505 to determine whether or not the detected terminal signal non-separation instruction information A is "1". I do. When it is determined that the terminal signal non-separation instruction information A is “1”, the process proceeds to step S506, and after the terminal signal non-separation instruction information A is rewritten to “0”, the process proceeds to step S507. If it is determined in step S505 that the terminal signal non-separation instruction information A is not “1”, the process proceeds to step S508, and after outputting a packet toward the terminal,
This processing operation ends.

Returning again to FIG. 2, terminal signal insertion section 23
1 to 234 are terminal signal input / output ports PORT2
It has a function of inserting a packet input via the terminals 81 to 284 into a packet stream transmitted from the terminal signal separation units 221 to 224. Terminal signal insertion section 231
To 234 are the same as those shown in FIG. 18 described above, and a description thereof will be omitted.

The header detection section 1801 of the terminal signal insertion sections 231 to 234, the header detection section 401 of the terminal signal separation sections 221 to 224, and the loopback signal insertion sections 211 to 214
Can be shared.

The buffers 241 to 244 temporarily store packets input from the terminal signal insertion units 231 to 234 and output the packets to the switch 251.

FIG. 6 is a block diagram showing the internal configuration of buffers 241 to 244. In FIG. 6, reference numeral 601 denotes a buffer memory, which comprises storage areas (1) to (4) corresponding to the output terminals of each channel. . Reference numeral 602 denotes a header detection unit.
It detects terminal signal non-separation instruction information A, node number N, and transmission channel number T from the packet header. 603, an address counter;
1 to supply a write address.

In the buffers 241 to 244, the headers of the packets input from the terminal signal insertion units 231 to 234 are detected by the header detection unit 602, and the storage area for storing the packets is determined based on the contents of the headers. The header detection unit 602 stores in advance the node number of the own node device (hereinafter, described as the own node number), the node number of the adjacent downstream node device (hereinafter, described as the downstream node number), and each of the buffers 241 to 241. 244 stores the transmission channel number of the parallel multiplex transmission path connected via the separation / insertion unit.

The header detector 602 determines that (1) the detected node number N matches the stored downstream node number or the own node number, and that the detected terminal signal non-separation instruction information A is “0” Is detected, the same storage area as the detected transmission channel number T is designated, a write address is generated from the address counter 603, and stored in the buffer memory 601.

(2) In cases other than the above (1), an arbitrary storage area is designated, a write address is generated from the address counter 603, and stored in the buffer memory 601.

In this way, the route of the packet is controlled.

FIG. 7 is a flowchart showing the flow of the operation for controlling the path of the packet. The header of the packet input in step S701 of the figure is detected.
Next, in step S702, it is determined whether or not the node number N detected in step S701 matches the stored own node number. If it is determined that the node number N does not match the own node number, the process proceeds to step S
The process proceeds to step S703, and if it is determined that the node number N matches the own node number, the process proceeds to step S705.

In the step S703, it is determined whether or not the detected node number N matches the stored downstream node number. If it is determined that the node number N does not match the stored downstream node number, step S7
The process proceeds to step S 707, and after specifying an arbitrary storage area, the process proceeds to step S 707.

On the other hand, when it is determined in step S702 that the node number N matches the own node number, and when it is determined in step S703 that the node number N matches the downstream node number, step S705 is performed. Proceed to.

In step S705, it is determined whether or not the detected terminal signal non-separation instruction information A is "0". If it is determined that the terminal signal non-separation instruction information A is not "0", the process proceeds to step S704, and an arbitrary storage area is designated. If it is determined in step S705 that the terminal signal non-separation instruction information A is “0”, the flow advances to step S706 to specify the same storage area as the detected transmission channel number T, and then to step S707. move on. In step S707, after outputting the packet to the buffers 241 to 244, the present processing operation ends.

Returning to FIG. 2 again, the switch 251 is controlled by the switch control section 252 to input the packets input to the input terminals IN (1) to IN (4) of the switch 251 to the output terminal OUT ( 1) to OUT (4). The switch control unit 252 controls, for example, the switch 251 according to the control pattern of FIG. The buffer control unit 253 controls each buffer 2
Input terminal IN of switch 251 connected to 41 to 244
(1) to IN (4) are the desired output terminals OUT (1) to OU
When connected to T (4), the buffers 241 to 244
Is controlled so as to read out the stored packet from.

The operations of the switch 251, the switch controller 252, and the buffer controller 253 are the same as those of the switch 1641 and the switch controller 16 shown in FIG.
42 and the buffer control unit 1643 are essentially the same (however, this embodiment shows a case where there are four parallel channels, so only this part differs).

FIG. 8 is a diagram showing a control pattern of an input / output connection relation of the switch 251.
A4 changes the input / output connection relationship of the switch 251. Input terminals IN (1) to IN (4) of switch 251
Are buffers 241 to 244 (for the channel of the node device 200, the input terminal IN201 of the node device 200
, And output terminals OUT (1) to OUT (4) of the switch 251 are connected to the node device 200.
Correspond to the output terminals OUT 271 to OUT 274.

Switch 251 and buffers 241 to 244
Are controlled in synchronization with each other. For example, the switch 251 switches the buffer 241 to the output terminal OUT21 of the node device 200.
When the packet is connected to the storage device 71, the packet stored in the storage area (1) corresponding to the output terminal OUT 271 of the node device 200 is read from the buffer 241. Also,
The buffer 241 is connected to the output terminal OUT27 of the node device 200.
2, the packet stored in the storage area (2) corresponding to the output terminal OUT272 of the node device 200 is read from the buffer 241.

Loopback signal separation units 261 to 264
Detects the header of a packet input from the switch 251, and outputs the output terminals OUT271 to OUT27 of the node device 200.
4 and a packet to be input to the loopback signal insertion units 211 to 214.

FIG. 9 shows loopback signal separation units 261 to 261.
FIG. 2 is a block diagram showing the internal configuration of H.264, in which 901 is a header detection unit, and 902 and 903 are first and second gates.

In FIG. 9, the header input unit 901 detects loopback instruction information B from a packet input from the switch 251, and performs opening / closing processing of the first gate 902 and the second gate 903 according to the contents.

The header detector 901 (1), when detecting that the loopback instruction information B is “1”, opens the second gate 903 and closes the first gate 902 to loop the packet. Output to the back signal insertion units 211 to 214.

(2) When detecting that the loopback instruction information B is “0”, the first gate 902 is opened and the second gate 903 is closed, and the packet is output to the output terminal OUT 271 of the node device 200. 274 to the transmission path.

Thus, the path of the packet is controlled.

Incidentally, the header detecting section 602 of the buffers 241 to 244 and the header detecting section 901 of the loopback signal separating sections 261 to 264 can be shared.

FIG. 10 is a flowchart showing the flow of the operation for controlling the packet path. In step S1001, the header of the packet input is detected. Next, in Step S1002, Step S100 is performed.
It is determined whether or not the loopback instruction information B detected in 1 is “0”. If it is determined that the loopback instruction information B is not "0", the process proceeds to step S100.
In step 3, after outputting the packet to the loopback signal insertion units 211 to 214, the processing operation ends.

On the other hand, if it is determined in step S1002 that the loopback instruction information B is “0”, the output terminal O of the node device 200 is determined in step S1004.
After outputting the packet to the UTs 271 to 274, the present processing operation ends.

FIG. 11 shows the node device 200 shown in FIG.
FIG. 1 is a diagram illustrating a system configuration of a communication network according to a first embodiment of the present invention, using a network. In the figure, 1
101 to 1104 are node devices, which are connected in a ring type by parallel multiplex transmission lines 1105 to 1108,
Each of the node devices 1101 to 1104 has four terminals 1111 to 1114, 1 via four sub-transmission paths.
121 to 1124, 1431 to 1134, 1141 to 1
144 are connected. Terminals 1111 to 1114 are:
The terminals 1121 to 11 correspond to the terminals connected to the terminal signal input / output ports PORT281 to 284 in FIG.
24, 1131-1134, 1141-1144 are also shown in FIG.
It corresponds to a terminal connected to one signal input / output port PORT 281 to 284.

In a communication network using the node device 200, (1) in a communication to a terminal connected to a downstream node device adjacent to a node device connected to a transmitting terminal for transmitting a packet, the packet is transmitted one or more rounds through the communication network. (2) In a communication to a terminal connected to the same node device as a node device connected to a transmitting terminal that transmits a packet, a packet needs to circulate in a communication network without allowing a communication band to be reduced without circulating. Enables communication without problems.

This will be described below.

That is, in the communication network of the present invention,
Regardless of a signal input from any terminal of the communication network and transmitted to any terminal, the communication network is connected to one terminal.
It is configured so that it does not go around more than one turn. As a result, the signal does not pass through a route that does not need to pass the signal, and unnecessary traffic is prevented from being added to the communication network.

Further, the communication network of the present invention is configured so that a signal input from any terminal of the communication network and transmitted to any terminal always passes through the switch at least twice. Thus, there is no communication in which the communication band is reduced as compared with other communication.

First, the operation in the case of communication other than the above (1) and (2) will be described. It is assumed that the terminal 1112 (own node number: 1, transmission channel number: 2)
A description will be given of a case where communication is performed with the node 33 (own node number: 3, transmission channel number: 3).

(1) First, at the terminal 1112, the terminal number of the receiving terminal 1133 (for example, N
= 3, T = 3), “0” is written in the A bit (terminal signal non-separation instruction information), and “0” is written in the B bit (loopback instruction information), and transmitted. The packet is input to the terminal signal input / output port PORT 282 of the node device 1101 through the sub-transmission path, and then the terminal signal insertion unit 232
Is input to the FIFO 1803.

(2) Selector 1 of terminal signal insertion section 232
At 802, the packet temporarily stored in the FIFO 1803 is inserted into the gap of the packet flow from the terminal signal separation unit 222 (which can be determined by the header detection unit 1801),
The packet stream is sent to the buffer 241.

(3) Header detection section 60 of buffer 241
2 detects the header of the input packet. Since the detected node number (N = 3) does not match the stored own node number (1) or the adjacent node number (2),
Specify any storage area. Here, for example, the storage area (1) is specified. The address counter 603 receives the information, generates a write address, and writes the packet to the storage area (1) of the buffer memory 601.

(4) At this time, the switch control section 252 controls the input / output connection relation of the switch 251 so that the control addresses A1 to A4 are circulated in a fixed cycle according to FIG. 253 has been notified. The buffer control unit 253 controls the control address A
When the packet is controlled to be read from the storage area (1) of the buffer 242 at the time of 4, the packet passes from the input terminal IN (2) of the switch 251 to the loopback signal separation unit 261 through the output terminal OUT (1). Is output.

(5) The header detector 901 of the loopback signal separator 261 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “0”, the first gate 902 is opened and the second gate 903 is closed, and the output terminal OU of the node device 1101 is closed.
The packet is output to the transmission path via T271.

(6) The packet output to the transmission path is input to the input terminal 201 of the node device 1102, then to the loopback signal insertion unit 211, and further to the terminal signal separation unit 221.

(7) The header of the packet input to the terminal signal separation section 221 is detected by the header detection section 401.
Since the detected node number (N = 3) does not match the stored own node number (2) and the A bit (terminal signal non-separation instruction information) is “0”, the first gate 402 is opened. Further, the second gate 403, the third gate 404, and the fourth gate 405 are closed, and the packet is output to the terminal signal insertion unit 231.

(8) Selector 1 of terminal signal insertion section 231
The packet output to the selector 802
Through the buffer 241. Header detector 60
2 indicates that the node number (N = 3) detected from the header matches the stored adjacent node number (3) and the detected A
Since the bit (terminal signal non-separation instruction information) is “0”, a storage area having the same number as the detected transmission channel number (T = 3) is specified. Here, since the transmission channel number is “3”, the packet is stored in the storage area (3).

(9) The packet stored in the storage area (3) of the buffer 241 is read at the time of the control address A3, and the input terminal IN (1) of the switch 251 is connected to the output terminal OUT (3). Through loopback signal separation unit 2
63.

(10) The header detector 901 of the loopback signal separator 263 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “0”, the first gate 902 is opened and the second gate 903 is closed, and the packet is output to the transmission path via the output terminal OUT273 of the node device 1102. I do.

(11) The packet output to the transmission path is
After being input to the input terminal IN203 of the node device 1103, it is input to the loopback signal insertion unit 213, and further,
The signal is input to terminal signal separation section 223.

(12) The header of the packet input to the terminal signal separation section 223 is detected by the header detection section 401. Since the detected node number (N = 3) matches the stored own node number (3) and the A bit (terminal signal non-separation instruction information) is “0”, the fourth gate 405 is opened and First gate 402, second gate 403 and third gate
The gate 404 is closed to output the packet only in the terminal direction.

(13) The packet output from the terminal signal separating section 223 toward the terminal is transmitted to the terminal signal input / output port PO.
It is sent to the terminal 1133 through the RT 283.

Next, in communication to a terminal connected to a downstream node device adjacent to a node device connected to a transmitting terminal that transmits a packet, a communication band is reduced even if the packet does not go around the communication network one or more times. In order to show that no communication is possible, an operation of communication to a terminal connected to an adjacent downstream node device will be described.

As an example, a case where communication is performed from terminal 1112 (own node number: 1, transmission channel number: 2) to terminal 1123 (own node number: 2, transmission channel number: 3) will be described.

(1) First, at the terminal 1112, the terminal number of the receiving terminal 1123 (for example, N
= 2, T = 3), "1" is written in the A bit (terminal signal non-separation instruction information), and "1" is written in the B bit (loopback instruction information) and transmitted. The packet is input to the terminal signal input / output port PORT 282 of the node device 1101 through the sub-transmission path, and then the terminal signal insertion unit 232
Is input to the FIFO 1803.

(2) Selector 1 of terminal signal insertion section 232
At 802, the packet temporarily stored in the FIFO 1803 is inserted into the gap of the packet flow from the terminal signal separation unit 222 (which can be determined by the header detection unit 1801),
The packet stream is sent to the buffer 242.

(3) Header detection section 60 of buffer 242
2 detects the header of the input packet. Since the detected A bit (terminal signal non-separation instruction information) is “1”, an arbitrary storage area is specified. Here, for example, the storage area (1) is specified. The address counter 603 receives the information, generates a write address, and writes the packet to the storage area (1) of the buffer memory 601.

(4) At this time, the switch control section 252 controls the input / output connection relation of the switch 251 so that the control addresses A1 to A4 are circulated in a fixed cycle according to FIG. 253 has been notified. The buffer control unit 253 controls the control address A
When the packet is controlled to be read from the storage area (1) of the buffer 242 at the time of 4, the packet passes from the input terminal IN (2) of the switch 251 to the loopback signal separation unit 261 through the output terminal OUT (1). Is output.

(5) The header detector 901 of the loopback signal separator 261 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “1”, the second gate 903 is opened and the first gate 902 is closed, and the packet is output to the FIFO 303 of the loopback signal insertion unit 211.

(6) In the selector 302 of the loopback signal insertion unit 211, the packet temporarily stored in the FIFO 303 is determined by the gap in the packet flow from the input terminal 201 of the node device 1102 (can be determined by the header detection unit 301). To the terminal signal separating unit 22.
Send to 1.

(7) The header of the packet input to terminal signal separating section 221 is detected by header detecting section 401.
Since the detected node number (N = 2) does not match the stored own node number (1) and the A bit (terminal signal non-separation instruction information) is “1”, the second gate 403 is opened. In addition, the first gate 402, the third gate 404, and the fourth gate 405 are closed, and the loopback instruction information B portion of the header is set to “0” by the loopback instruction information deletion processing unit 406.
, And outputs the rewritten packet to the terminal signal insertion unit 231.

(8) Selector 1 of terminal signal insertion section 231
The packet output to the selector 802
Through the buffer 241. Header detector 60
2 indicates that the node number (N = 2) detected from the header matches the stored adjacent node number (2) and the detected A
Since the bit (terminal signal non-separation instruction information) is “0”, a storage area having the same number as the detected transmission channel number (T = 3) is specified. Here, since the transmission channel number is “3”, the packet is stored in the storage area (3).

(9) The packet stored in the storage area (3) of the buffer 241 is read at the time of the control address A3, and the packet is transferred from the input terminal IN (1) to the output terminal OUT (3) of the switch 251. Through loopback signal separation unit 2
63.

(10) The header detector 901 of the loopback signal separator 263 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “0”, the first gate 902 is opened and the second gate 903 is closed, and the packet is output to the transmission path via the output terminal OUT273 of the node device 1101. I do.

(11) The packet output to the transmission path is
After being input to the input terminal IN203 of the node device 1102, it is input to the loopback signal insertion unit 213, and further,
The signal is input to terminal signal separation section 223.

(12) The header of the packet input to the terminal signal separating section 223 is detected by the header detecting section 401. Since the detected node number (N = 2) matches the stored own node number (2) and the A bit (terminal signal non-separation instruction information) is “0”, the fourth gate 405 is opened and First gate 402, second gate 403 and third gate
The gate 404 is closed to output the packet only in the terminal direction.

(13) The packet output from the terminal signal separating section 223 toward the terminal is transmitted to the terminal signal input / output port PO.
It is sent to the terminal 1123 through the RT 283.

In this case, the transmission band is the same as the condition described in the section of “Prior Art”, that is, the transmission band per transmission line is Tbps, and the transmission band of the sub-transmission line between the terminal and the node device is When the bandwidth is also calculated as Tbps, the communication speed is Tbp on all the paths (1) to (13).
s. Therefore, from the terminal 212 to the terminal 2
The communication band of the communication to 23 is Tbps. Therefore, it can be seen that the problem of narrowing the communication band when transmitting a packet to a terminal connected to an adjacent downstream node device is solved.

Further, according to the present invention, the packet travels one round the communication network (that is, the packet
1, 1102, 1103, 1104, 1101, 110
It is clear that the packet is not transmitted to the terminal connected to the adjacent downstream node device by passing through the node device 2 (the packet is transmitted to the node devices 1101 and 11).
02, the packet is transmitted to the terminal connected to the adjacent downstream node device).

Next, according to the present invention, in the communication to the terminal connected to the same node device as the node device connected to the transmitting terminal that transmits the packet, it is possible to perform the communication that does not require the packet to go around the communication network. explain.

As an example, a case where communication is performed from terminal 1112 (own node number: 1, transmission channel number: 2) to terminal 1113 (own node number: 1, transmission channel number: 3) will be described.

(1) First, at the terminal 1112, the terminal number (for example, N
= 1, T = 3), “1” is written in the A bit (terminal signal non-separation instruction information), and “1” is written in the B bit (loopback instruction information), and transmitted. The packet is input to the terminal signal input / output port PORT 282 of the node device 1101 through the sub-transmission path, and then the terminal signal insertion unit 232
Is input to the FIFO 1803.

(2) Selector 1 of terminal signal insertion section 232
At 802, the packet temporarily stored in the FIFO 1803 is inserted into the gap of the packet flow from the terminal signal separation unit 222 (which can be determined by the header detection unit 1801),
The packet stream is sent to the buffer 242.

(3) Header detection section 60 of buffer 242
2 detects the header of the input packet. Since the detected A bit (terminal signal non-separation instruction information) is “1”, an arbitrary storage area is specified. Here, for example, the storage area (1) is specified. The address counter 603 receives the information, generates a write address, and writes the packet to the storage area (1) of the buffer memory 601.

(4) At this time, the switch control unit 252 controls the input / output connection relationship of the switch 251 so that the control addresses A1 to A4 are circulated in a fixed cycle according to FIG. 253 has been notified. The buffer control unit 253 controls the control address A
When the packet is controlled to be read from the storage area (1) of the buffer 242 at the time of 4, the packet passes from the input terminal IN (2) of the switch 251 to the loopback signal separation unit 261 through the output terminal OUT (1). Is output.

(5) The header detector 901 of the loopback signal separator 261 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “1”, the second gate 903 is opened and the first gate 902 is closed, and the packet is output to the FIFO 303 of the loopback signal insertion unit 211.

(6) In the selector 302 of the loopback signal insertion unit 211, the packet temporarily stored in the FIFO 303 is determined by the gap of the packet flow from the input terminal 201 of the node device 1102 (can be determined by the header detection unit 301). To the terminal signal separating unit 22.
Send to 1.

(7) The header of the packet input to terminal signal separating section 221 is detected by header detecting section 401.
Since the detected node number (N = 1) matches the stored own node number (1) and the A bit (terminal signal non-separation instruction information) is “1”, the third gate 404 is opened and The first gate 402, the second gate 403, and the fourth gate 405 are closed, and the terminal signal non-separation instruction information deletion processing unit 407 rewrites the terminal signal non-separation instruction information A portion of the header to “0”. The packet is output to terminal signal insertion section 231.

(8) Selector 1 of terminal signal insertion section 231
The packet output to the selector 802
Through the buffer 241. Header detector 60
2 indicates that the node number (N = 1) detected from the header matches the stored adjacent node number (1) and the detected A
Since the bit (terminal signal non-separation instruction information) is “0”, a storage area having the same number as the detected transmission channel number (T = 3) is specified. Here, since the transmission channel number is “3”, the packet is stored in the storage area (3).

(9) The packet stored in the storage area (3) of the buffer 241 is read at the time of the control address A3, and is separated from the input terminal IN1 of the switch 251 through the output terminal OUT3 to separate the loopback signal. It is output to the unit 263.

(10) The header detector 901 of the loopback signal separator 263 detects the header of the input packet. Since the detected B bit (loopback instruction signal) is “1”, the second gate 903 is opened and the first gate 902 is closed, and the packet is output to the FIFO 303 of the loopback signal insertion unit 213.

(11) The selector 302 of the loopback signal insertion unit 213 inserts the packet temporarily stored in the FIFO 303 into the gap of the packet flow from the input terminal IN201 of the node device (which can be determined by the header detection unit 303). Then, the packet flow is transmitted to the terminal signal separation unit 223.
Send to

(12) The header of the packet input to the terminal signal separating section 223 is detected by the header detecting section 401. Since the detected node number (N = 1) matches the stored own node number (1) and the A bit (terminal signal non-separation instruction information) is “0”, the fourth gate 405 is opened and First gate 402, second gate 403 and third gate
The gate 404 is closed to output the packet only in the terminal direction.

(13) The packet output from the terminal signal separating section 223 toward the terminal is transmitted to the terminal signal input / output port PO.
It is sent to the terminal 1113 through the RT 283.

As described above, according to the present invention, a packet makes one round of the communication network (that is, the packet
01, 1102, 1103, 1104, 1101, 11
02, it is clear that the packet is not transmitted to the terminal connected to the own node device (the packet is connected to the own node device by passing only inside the node device 1101). Transmitting a packet to the terminal).

Further, in the present embodiment, the case where the number of the parallel transmission channels is four has been described, but the number of the parallel transmission channels is not limited. For example, as shown in the above-described conventional example, It is needless to say that the present invention includes eight parallel transmission channels.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.

In FIG. 2 of the first embodiment described above, a space division parallel multiplex transmission line such as a ribbon fiber is used as a transmission line. The optical fiber is configured to multiplex the signal.

FIG. 12 is a block diagram showing the configuration of a node device when the wavelength multiplexing technique is used. In FIG. 12, the same parts as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 12, 1200 is a node device,
Reference numerals 1201 to 1204 denote input terminals IN (1) to IN (4) for inputting signals from a parallel transmission line, and include an optical receiver for converting an optical signal into an electric signal. This optical receiver performs not only photoelectric conversion, but also clock extraction, decoding of a transmission path encoded signal, and the like. The input terminal IN1201 converts the optical signal of the wavelength λ1 into an electric signal, and
02 converts an optical signal of wavelength λ2 into an electrical signal,
N1203 converts the optical signal having the wavelength λ3 into an electric signal, and the input terminal IN1204 converts the optical signal having the wavelength λ4 into an electric signal.

Reference numerals 1271 to 1274 denote output terminals OUT (1) to OUT (4) for outputting signals to the parallel transmission lines, and include an optical transmitter for converting an electric signal to an optical signal. This optical transmitter performs transmission path coding and the like in addition to electro-optical conversion. The output terminal OUT1271 outputs the electric signal to the wavelength λ1.
The output terminal OUT1272 converts the electric signal into an optical signal having the wavelength λ2, the output terminal OUT1273 converts the electric signal into an optical signal having the wavelength λ3, and the output terminal OUT1272.
74 converts the electric signal into an optical signal of wavelength λ4.

Reference numeral 1281 denotes a multiplexer which is connected to each output terminal OUT12.
The optical signals output from 71 to 1274 are condensed on one optical fiber and output to an external optical fiber transmission line. 128
Reference numeral 2 denotes a demultiplexer for separating optical signals of wavelengths λ1 to λ4 sent from the external optical fiber transmission line into respective wavelengths.

Note that the other configuration in FIG. 12 is the same as that in FIG. 2 of the first embodiment, and a description thereof will be omitted.

[0205] Even when the node device 1200 according to the present embodiment is used, the same effect as that of the above-described first embodiment can be obtained.

(Third Embodiment) Next, the third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.

In a communication network having a ring-type transmission line as shown in the present invention, if the transmission line is broken or a circuit at an input terminal or an output terminal of a node device breaks down, the entire communication network becomes unable to communicate. In order to prepare for this, it is often performed to duplicate the communication path between the main transmission path and the sub transmission path.

In this embodiment, the path from the loopback signal separation section to the loopback signal insertion section is also used as the transmission path of the sub transmission path.

FIG. 13 is a block diagram showing the configuration of the node device according to the present embodiment. In FIG. 13, the same parts as those in FIG. 2 in the first embodiment are denoted by the same reference numerals. .

In FIG. 13, the main transmission path is the input terminal I
N201 to N204 are paths that pass through the output terminals OUT271 to 274, and the sub-transmission line is the input terminal IN1.
Output terminals OUT1375 to 1378 from 305 to 1308
It is a route that passes through. As for the connection between the node devices, the main transmission path connects the main transmission paths, and the sub transmission path connects the sub transmission paths.

In FIG. 13, reference numeral 1300 denotes a node device;
Reference numerals 1305 to 1308 denote input terminals IN (5) to IN (8) for inputting signals from a parallel transmission line (sub transmission line), and include an optical receiver for converting an optical signal into an electric signal. It is. 1375 to 1378 are parallel transmission paths (sub transmission paths)
Output terminals OUT (5) to OUT for outputting signals to
(8) An optical transmitter for converting an electric signal into an optical signal is included.

Reference numeral 1301 denotes a communication control unit which, when a failure occurs somewhere in the main transmission path (or sub transmission path), sends all packets to the loopback signal insertion unit toward the loopback signal insertion unit. Instruct to output. This instruction can be made independently for at least the loopback signal separation unit connected to the main transmission path and the loopback signal separation unit connected to the subtransmission path.

Reference numerals 1361 to 1368 denote loopback signal separation units which detect the header of an input packet and output a packet to a transmission line via an output terminal of the node device 1300 and a packet input to a loopback signal insertion unit. And is separated into Also, a loopback signal separation unit 1
361 to 1368 also output all packets to the loopback signal insertion unit in accordance with an instruction from the communication control unit 1301.

FIG. 14 is a block diagram showing a loop-back signal separating section 136.
FIG. 1 is a block diagram showing the internal configuration of Nos. 1 to 1368. In FIG.
Reference numeral 3 denotes first and second gates.

When the communication control unit 1301 instructs to output all packets to the loopback signal insertion unit, the second gate 1403 is always opened and the first gate 1402 is closed. Then, all the packets are output to the loopback signal insertion unit. If the communication control unit 1301 has not instructed to output all the packets to the loopback signal insertion unit, the header detection unit 1401 detects the loopback instruction information B of the input packet. , A first gate 1402 and a second gate 1403 depending on the contents of the header.
Is opened and closed.

The header detector 1401 (1) opens the second gate 1403 and detects the first gate
The gate 1402 is closed to output the packet to the loopback signal insertion unit.

(2) When it is detected that the loopback instruction information B is “0”, the first gate 1402 is opened and the second gate 1403 is closed, and the packet is sent to the output terminal of the node device 1300. Output to the transmission path via

Thus, the path of the packet is controlled.

Returning to FIG. 13 again, 1311-1318
Is a loop-back signal insertion unit, which receives packets input from the loop-back signal separation units 1361 to 1368 from the packet flow (main transmission path) transmitted from the input terminals 201 to 204 or transmitted from the input terminals 1305 to 1308. It has the function of inserting it into the incoming packet stream (sub-transmission path).

Loopback signal insertion units 1311 to 131
8 is the same as FIG. 3 in the first embodiment described above.

Note that the other configuration in FIG. 13 is the same as that in FIG. 2 in the above-described first embodiment, and a description thereof will be omitted.

Using node device 1300 according to the present embodiment, loopback signal separation units 1361 to 1368
The same effect as in the first embodiment described above can be obtained even when the path leading to the loopback signal insertion units 1311 to 1318 is also used as the path of the sub transmission path prepared for the occurrence of a failure. Can be.

(Fourth Embodiment) Next, the fourth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.

In the above-described first to third embodiments, the terminal performing communication outputs a cell having the header shown in FIG. 1 so that (1) the packet is transmitted to the terminal connected to the adjacent downstream node device. When transmitting a packet to a terminal connected to an adjacent downstream node device in order to solve the problem of (1) above, If the route is made to make a round of the communication network, the packet will pass through a route that the packet does not need to pass through, and unnecessary traffic will be added to the communication network. (3) "When transmitting a packet to a receiving terminal connected to the same node device as the transmitting terminal, the packet is received unless it goes around the communication network once. It was it possible to perform communication while solving the "problem that does not reach to the terminal.

However, the fact that a cell having a header as shown in FIG. 1 must be output from the terminal means that the NIC (Network Inte
rface Card). That is, a commercially available general NIC (for example, ATM
For example, may not be used in the present invention.

A communication network according to the present embodiment
This is to avoid that a commercially available general NIC or the like cannot be used.

The configuration of the node device used for the communication network in the present embodiment is the same as that in FIG. 2 in the first embodiment and FIG. 12 in the second embodiment. However, the functions of the terminal signal input / output ports PORT 281 to 284 shown in FIGS. 2 and 12 are expanded. Terminal signal input / output ports PORT281-284
Exists between the terminal signal separation unit and the terminal signal separation unit and a terminal (equipped with a commercially available NIC) connected to the terminal signal separation unit.

Terminal signal input / output port PO of this embodiment
The RTs 281 to 284 have a function of performing conversion from a header format that can be output from a commercially available NIC to the header format shown in FIG. 1 and vice versa,
It has a conversion table required for this purpose (hereinafter referred to as a header conversion table). Therefore, in the present embodiment, the terminal signal input / output ports PORT 281 to 284
Terminal signal input / output port PO
RTs 281 to 284 will be referred to as header conversion means.

FIG. 15 is a block diagram showing a configuration of a communication network according to the present embodiment.
The same parts as those in FIG. 11 in the first embodiment are denoted by the same reference numerals.

The difference between FIG. 15 and FIG. 11 is that FIG.
At least one call acceptance and header conversion means control module (control means) in a communication network having one configuration
1500 is provided.

The place where the call reception and header conversion means control module 1500 is provided is not particularly limited in the communication network. However, as described below, the preliminary communication with the terminal is performed according to a predetermined protocol, so that the preliminary communication can be performed. Any place is fine. In addition, since the following control is performed on the header conversion means (terminal signal input / output ports PORT 281 to 284) in each of the node devices 1101 to 1104, any control unit can be used as long as the control is possible. For example, a call reception and header conversion means control module 1500 may be provided on a certain terminal, or a call reception and header conversion means control module 1500 may be provided on a node device.

In the present embodiment, the call acceptance and header conversion means control module 1500 can exchange information with each terminal according to a predetermined procedure (preliminary communication protocol). Specifically, information is exchanged according to the following procedure.

(1) Before the terminal performs communication (actual communication),
Call acceptance and header conversion means control module 1500
, The transmission terminal (own terminal) information (address) and the destination terminal information (address) of the actual communication are transmitted by the preliminary communication protocol.

(2) The call reception and header conversion means control module 1500 calculates a header (referred to as a header between terminal nodes) to be used for the actual communication from the obtained transmission terminal information and destination terminal information, and sends the header to the terminal. Tell The header between terminal nodes at this time is a header that can be set by a commercially available NIC.

(3) The terminal performs actual communication by adding the header between terminal nodes obtained from the call acceptance and header conversion means control module 1500 to the packet.

At the same time, the call acceptance and header conversion means control module 1500 performs the following processing based on the transmission terminal information and the destination terminal information.

(1) For the header conversion table of the header conversion means (terminal signal input / output port) connected to the transmitting terminal, the header between the terminal nodes transmitted to the terminal by the above-mentioned preliminary communication protocol is used as the header of FIG. Set the header conversion table to convert to.

(2) For the header conversion table of the header conversion means (terminal signal input / output port) connected to the destination terminal, the header of FIG. 1 is converted into a header between terminal nodes that can be received by a commercially available NIC. Set the header conversion table to perform conversion.

By performing such processing before actual communication, it becomes possible for a terminal equipped with a commercially available NIC to perform communication according to the present invention.

The procedure of the actual communication after this processing is as follows.
In the procedure shown in the first embodiment described above, the packet (the header is a header between terminal nodes specified by the above-mentioned preliminary communication protocol) transmitted from the transmitting terminal to the node device is converted by the header converting means ( At the terminal signal input / output port), the point converted to the header in the format of FIG. 1 and the packet sent from the node device to the destination terminal (the header is in the format of FIG. 1) are converted by the header conversion means connected to the terminal. Commercial NIC
The point is converted to a terminal-to-terminal node header that can be received by the above-described method, and the other points are the same.

[0241]

As described above in detail, according to the present invention, even if a signal is input from any terminal of the communication network and transmitted to any terminal, the signal makes one or more rounds of the communication network. As a result, the signal does not pass through a route that the signal does not need to pass through, and unnecessary traffic can be prevented from being added to the communication network.

Further, according to the present invention, even if a signal is input from any terminal of the communication network and transmitted to any terminal, the signal always passes through the switch at least twice. It is possible to prevent the existence of communication in which the band is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a packet used in a communication network according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a node device according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating an internal configuration of a loopback signal insertion unit of the node device according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing an internal configuration of a terminal signal separation unit of the node device according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing an operation flow of a terminal signal separation unit of the node device according to the first embodiment of the present invention.

FIG. 6 is a block diagram showing an internal configuration of a buffer of the node device according to the first embodiment of the present invention.

FIG. 7 is a flowchart illustrating a flow of an operation of a buffer of the node device according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating a control law of a buffer and a switch of the node device according to the first embodiment of the present invention.

FIG. 9 is a block diagram illustrating an internal configuration of a loopback signal separation unit of the node device according to the first embodiment of the present invention.

FIG. 10 is a flowchart showing an operation flow of a loopback signal separation unit of the node device according to the first embodiment of the present invention.

FIG. 11 is a diagram illustrating a configuration of a communication network including a node device according to the first embodiment of the present invention.

FIG. 12 is a block diagram illustrating a configuration of a node device according to a second embodiment of the present invention.

FIG. 13 is a block diagram illustrating a configuration of a node device according to a third embodiment of the present invention.

FIG. 14 is a block diagram illustrating an internal configuration of a loopback signal separation unit of the node device according to the third embodiment of the present invention.

FIG. 15 is a block diagram illustrating a configuration of a communication network according to a fourth embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of a conventional node device.

FIG. 17 is a block diagram showing an internal configuration of a terminal signal separation unit of a conventional node device.

FIG. 18 is a block diagram showing an internal configuration of a terminal signal insertion unit of a conventional node device.

FIG. 19 is a block diagram showing an internal configuration of a buffer of a conventional node device.

FIG. 20 is a diagram illustrating a control law of a buffer and a switch of a conventional node device.

FIG. 21 is a block diagram illustrating a configuration of a communication network including a conventional node device.

FIG. 22 is a diagram illustrating a communication principle of a communication network including a conventional node device.

[Explanation of symbols]

Reference Signs List 101 header 102 data 200 node device 201 input terminal (1) 202 input terminal (2) 203 input terminal (3) 204 input terminal (4) 211 loopback signal insertion unit (1) 212 loopback signal insertion unit (2) 213 Loopback signal insertion unit (3) 214 Loopback signal insertion unit (4) 221 Terminal signal separation unit (1) 222 Terminal signal separation unit (2) 223 Terminal signal separation unit (3) 224 Terminal signal separation unit (4) 231 Terminal signal insertion unit (1) 232 Terminal signal insertion unit (2) 233 Terminal signal insertion unit (3) 234 Terminal signal insertion unit (4) 241 Buffer (1) 242 Buffer (2) 243 Buffer (3) 244 Buffer (4) ) 251 switch 252 switch control unit 253 buffer control unit 261 loopback signal separation unit (1) 262 Loopback signal separation unit (2) 263 Loopback signal separation unit (3) 264 Loopback signal separation unit (4) 271 Output terminal OUT (1) 272 Output terminal OUT (2) 273 Output terminal OUT (3) 274 Output terminal OUT (4) 281 Terminal signal input / output port PORT (1) 282 Terminal signal input / output port PORT (2) 283 Terminal signal input / output port PORT (3) 284 Terminal signal input / output port PORT (4) 301 Header detector 302 Selector 303 FIFO 401 Header detection unit 402 First gate 403 Second gate 404 Third gate 405 Fourth gate 406 Loopback instruction information deletion processing unit 407 Terminal signal non-separation instruction information deletion processing unit 601 Buffer memory 602 Header detection unit 603 Address counter 901 header detector 90 2 first gate 903 second gate 1101 node device 1102 node device 1103 node device 1104 node device 1105 transmission line 1106 transmission line 1107 transmission line 1108 transmission line 1111 terminal 1112 terminal 1113 terminal 1114 terminal 1121 terminal 1122 terminal 1123 terminal 1124 terminal 1131 terminal 1132 terminal 1133 terminal 1134 terminal 1141 terminal 1142 terminal 1143 terminal 1144 terminal 1200 node device 1201 input terminal IN (1) 1202 input terminal IN (2) 1203 input terminal IN (3) 1204 input terminal IN (4) 1271 output terminal OUT ( 1) 1272 Output terminal OUT (2) 1273 Output terminal OUT (3) 1274 Output terminal OUT (4) 1281 Multiplexer 1282 Duplexer 1300 Node device 13 01 Communication control unit 1305 Input terminal IN (5) 1306 Input terminal IN (6) 1307 Input terminal IN (7) 1308 Input terminal IN (8) 1311 Loopback signal insertion unit (1) 1312 Loopback signal insertion unit (2) 1313 Loopback signal insertion unit (3) 1314 Loopback signal insertion unit (4) 1315 Loopback signal insertion unit (5) 1316 Loopback signal insertion unit (6) 1317 Loopback signal insertion unit (7) 1318 Loopback signal insertion Unit (8) 1361 Loopback signal separation unit (1) 1362 Loopback signal separation unit (2) 1363 Loopback signal separation unit (3) 1364 Loopback signal separation unit (4) 1365 Loopback signal separation unit (5) 1366 Loopback signal separation unit (6) 1367 For loopback signal Unit (7) 1368 Loopback signal separation unit (8) 1375 Output terminal OUT (5) 1376 Output terminal OUT (6) 1377 Output terminal OUT (7) 1378 Output terminal OUT (8) 1401 Header detection unit 1402 First gate 1403 Second gate 1500 Call acceptance and header conversion means control module

Claims (43)

[Claims] A plurality of channels, a switch connected to the plurality of channels, and a signal for outputting a signal input from each of the plurality of channels on one of the plurality of channels; A terminal to be connected, a first separating unit for separating only a specific signal from the plurality of channels, and the first separating unit connecting the specific signal separated by the first separating unit. A first insertion means for inserting the channel into a communication channel, wherein the plurality of channels are connected in a ring type via the switch to form a parallel ring transmission path, After a signal input to the network and arriving at the destination terminal is input to the communication network, the signal passes through the switch two or more times and passes through the communication network. A communication network comprising control means for controlling not to make one or more rounds. 2. The plurality of channels connected to the output side of the switch are provided with the first separation means, and the plurality of channels connected to the input side of the switch are provided with the first insertion means. The communication network according to claim 1, wherein the communication network is provided. 3. A loopback instruction information adding means for adding information (loopback instruction information) for determining whether or not a specific signal should be separated from the plurality of channels by the first separating means to the signal. The communication network according to claim 1 or 2, wherein: 4. The first separating means has a loopback instruction information detecting means for detecting the loopback instruction information, and the first separating means detects a signal to which the loopback instruction information is added. The signal is separated by the first separating means from the plurality of channels, and the separated signal is inserted into the channel to which the first separating means is connected by the first inserting means. The communication network according to claim 3. 5. The terminal according to claim 2, wherein the plurality of channels include a second channel.
Of the signals transmitted through the channel to which the second separating unit is connected, the second separating unit separating the signal to be output to the terminal from the channel. 5. The communication network according to claim 1, wherein the data is output to a terminal. 6. A terminal signal non-separation instruction information for adding information (terminal signal non-separation instruction information) to the signal to determine whether a specific signal should be separated from the plurality of channels by the second separation means. The communication network according to claim 1, further comprising an adding unit. 7. The second separating means includes a terminal signal non-separating instruction information detecting means for detecting the terminal signal non-separating instruction information, and wherein the second separating means comprises a second separating means. 7. The communication network according to claim 6, wherein a signal to be output to a terminal among signals transmitted through a channel to which the means is connected is separated from the channel and output to the terminal. 8. The communication network according to claim 6, wherein the second separating unit includes an information deleting unit that deletes the loopback instruction information and the terminal signal non-separating instruction information. 9. The switch, if the terminal signal non-separation instruction information is added, even if the signal can reach the destination terminal after passing through the switch once after being input to the communication network. 9. The communication network according to claim 6, wherein the signal is output to any one of the plurality of channels. 10. The switch according to claim 1, wherein the switch is a signal that can reach the destination terminal after passing through the switch one more time and the signal to which the terminal signal non-separation instruction information is not added is transmitted to the destination terminal of the plurality of channels. 10. The signal is output on a channel to which the signal is connected.
Communication network as described. 11. The buffer according to claim 1, wherein the switch stores a signal input from each of the plurality of channels, and separately outputs a signal for each of the input channels. 11. A switching unit for switching connection with the plurality of channels to be output.
Communication network as described. 12. The switch has output channel variable means provided in correspondence with each output from the buffer for each channel, and switches the output channel of the output channel variable means so that the input is changed. 12. The communication network according to claim 11, wherein the output of each channel and the connection of the output channel are switched. 13. The switching between the output for each channel from the buffer and the output channel is performed according to a predetermined pattern so that a plurality of outputs for each channel from the buffer are not connected to the same output channel at the same time. The communication network according to claim 11 or 12, wherein 14. The communication network according to claim 1, further comprising a second insertion unit for inserting a signal into the plurality of channels. 15. The communication network according to claim 5, further comprising a node device provided with said switch, said first and second separating means, and said first inserting means. 16. The communication network according to claim 15, wherein a second insertion unit that inserts a signal into the plurality of channels is provided in the node device. 17. A communication network in which a plurality of node devices for connecting a plurality of terminals are connected in a ring by a plurality of channels, wherein at least one switch for transferring a packet between the channels is provided. A first separating unit that separates a specific packet from the plurality of channels out of the output of the switch; and the specific packet separated by the first separating unit is connected to an input of the switch. The first of the plurality of channels
And a first insertion unit that inserts the packet into the channel to which the separation unit is connected. A reception terminal connected to a downstream node device adjacent to a node device connected to a transmission terminal that transmits a packet or a transmission terminal that transmits a packet is connected. When transmitting a packet to a receiving terminal connected to the same node device as the node device, the packet transmitted from the transmitting terminal passes through the switch, and is further separated from the plurality of channels by the first separating unit, Further, the communication network is configured to be inserted into the plurality of channels by the first insertion unit and then transmitted to the receiving terminal. 18. A communication network in which a plurality of node devices for connecting a plurality of terminals are connected in a ring by a plurality of channels, wherein the node devices switch packets input on the plurality of channels. A switch that outputs a signal on any one of the plurality of channels, a first separating unit that separates a specific packet among the packets output from the switch from the plurality of channels, Second separating means for separating a packet to be output to a connected terminal from the transmitted packets from the channel, and separating the specific packet separated by the first separating means into the first separating means And first insertion means for inserting the input of the second separation means connected to the same channel as the connected channel, further comprising: Adding, to the packet, loopback instruction information required for separating the packet by the first separating means and terminal signal non-separating instruction information required for not separating the packet by the second separating means. A communication network comprising information addition / deletion means for deleting or deleting information. 19. A node device used in a communication network in which a plurality of node devices for connecting a plurality of terminals are connected in a ring shape by a plurality of channels, wherein a packet input through the plurality of channels is switched. A switch for outputting a signal on any one of the plurality of channels, a first separating unit for separating a specific packet among the packets output from the switch from the plurality of channels, and transmitting the plurality of channels. Second separating means for separating a packet to be output to a connected terminal from the plurality of channels from the plurality of channels,
A first insertion unit for inserting the specific packet separated by the first separation unit into an input of the second separation unit connected to the same channel as the channel to which the first separation unit is connected; Loop-back instruction information required for separating the packet by the first separating means, and terminal signal non-separating instruction information required for not separating the packet by the second separating means. Characterized in that it has information addition / deletion means for adding or deleting a packet to or from a packet. 20. A plurality of channels, a switch connected to the plurality of channels, and a signal for outputting a signal input in each channel on any one of the plurality of channels, and a switch connected to the plurality of channels. A terminal to be connected, first separating means for separating a specific signal of the output of the switch from the plurality of channels, and connecting the specific signal separated by the first separating means to an input of the switch And first insertion means for inserting into the channel to which the first separation means is connected among the plurality of channels, wherein the plurality of channels are formed in a ring shape via the switch A signal transmission control method in a communication network, wherein a signal input to the communication network, transmitted through the channel, and reaching a destination terminal is transmitted to the communication network. A transmission control method that, after being input to a network, passes through the switch at least twice and reaches the destination terminal without making one or more rounds of the communication network. 21. A step of adding information (loopback instruction information) for determining whether or not to separate a specific signal from the plurality of channels by the first separating means to the signal. The transmission control method according to claim 20. 22. The first separating means includes a loopback instruction information detecting means for detecting the loopback instruction information, and for the signal to which the loopback instruction information is added, The first separating means separates the signal from the plurality of channels, further inserts the separated signal into the channel to which the first inserting means is connected by the first inserting means, and 22. The control of passing through the switch again.
Transmission control method as described. 23. The terminal, wherein the terminal is connected to the plurality of channels via a second separating unit, and the second separating unit is transmitted on a channel to which the second separating unit is connected. 23. The transmission control method according to claim 20, wherein control is performed such that a signal to be output to the terminal is separated from the channel and output to the terminal among the signals output. 24. A step of adding information (terminal signal non-separation instruction information) that can determine whether or not to separate a specific signal from the plurality of channels by the second separation means to the signal. The transmission control method according to claim 23, wherein: 25. The second separation means includes terminal signal non-separation instruction information detection means for detecting the terminal signal non-separation instruction information, and the second separation means comprises a second separation means. 25. The transmission control method according to claim 24, wherein of the signals transmitted on the channel to which the means is connected, a signal to be output to the terminal is controlled so as to be separated from the channel and output to the terminal. 26. The transmission control method according to claim 24, wherein said second separation means has a step of deleting said loopback instruction information and said terminal signal non-separation instruction information. 27. The switch according to claim 17, wherein the signal is a signal that can reach a destination terminal after being input to the communication network once through the switch, if the terminal signal non-separation instruction information is added. 27. The transmission control method according to claim 24, wherein the output is controlled to output to any one of the plurality of channels. 28. The switch, according to claim 28, wherein the signal that can reach the destination terminal after passing through the switch one more time and the signal to which the terminal signal non-separation instruction information is not added is transmitted by the destination terminal among the plurality of channels. 28. The transmission control method according to claim 24, wherein the output is performed on a connected channel. 29. A buffer for storing signals input from the plurality of channels and outputting the signals separately for each of the input channels, and an output for each channel from the buffer and the switch for outputting a signal. A switching unit for switching connection with the plurality of channels to be output, and switching between the output for each channel from the buffer and the output channel, according to a predetermined pattern and the output for each channel from the buffer. 29. The transmission control method according to claim 20, wherein the transmission control method is performed so that a plurality of data are not simultaneously connected to the same output channel. 30. The signal processing method according to claim 20, wherein inputting a signal to said communication network is performed by inserting a signal into said channel by a second inserting means provided in said channel. Transmission control method. 31. A plurality of channels, a switch connected to the plurality of channels, and a signal for outputting a signal input in each channel on one of the plurality of channels, and a switch connected to the plurality of channels. A terminal to be connected, first separating means for separating a specific signal of the output of the switch from the plurality of channels, and connecting the specific signal separated by the first separating means to an input of the switch And first insertion means for inserting into the channel to which the first separation means is connected among the plurality of channels, wherein the plurality of channels are formed in a ring shape via the switch A signal transmission control device in a communication network, wherein a signal input to the communication network, transmitted through the channel, and arriving at a destination terminal is transmitted to the communication network. A transmission control device for controlling the transmission terminal to reach the destination terminal after passing through the switch two or more times and without circling the communication network one or more times after being input to the network. . 32. A loopback instruction information adding means for adding information (loopback instruction information) for determining whether or not a specific signal is separated from the plurality of channels by the first separation means to the signal. 32. The transmission control device according to claim 31, wherein: 33. The first separating means includes a loopback instruction information detecting means for detecting the loopback instruction information, and for a signal to which the loopback instruction information is added, The first separating means separates the signal from the plurality of channels, further inserts the separated signal into the channel to which the first inserting means is connected by the first inserting means, and 33. The control of passing through the switch again.
The transmission control device according to claim 1. 34. The terminal is connected to the plurality of channels via a second separating unit, and the second separating unit is transmitted on a channel to which the second separating unit is connected. 34. The transmission control device according to claim 31, wherein control is performed such that a signal to be output to the terminal is separated from the channel and output to the terminal among the signals. 35. Terminal signal non-separation instruction information to which information (terminal signal non-separation instruction information) that can determine whether or not a specific signal is separated from the plurality of channels by the second separation means is added to the signal. 35. The transmission control device according to claim 34, further comprising an adding unit. 36. The second separating means includes a terminal signal non-separating instruction information detecting means for detecting the terminal signal non-separating instruction information, and the second separating means comprises a second separating means. 36. The transmission control device according to claim 35, wherein of the signals transmitted through the channel to which the means is connected, a signal to be output to the terminal is controlled so as to be separated from the channel and output to the terminal. 37. The apparatus according to claim 35, wherein the second separating means includes information deleting means for deleting the loopback instruction information and the terminal signal non-separating instruction information.
36. The transmission control device according to 36. 38. The switch, if the terminal signal non-separation instruction information is added even if the signal can reach the destination terminal if it passes through the switch once after being input to the communication network. 38. The transmission control device according to claim 35, 36, or 37, wherein control is performed so as to output to any one of the plurality of channels. 39. The switch, if the destination terminal of the plurality of channels is a signal that can reach the destination terminal after passing through the switch one more time and the terminal signal non-separation instruction information is not added. 39. The transmission control device according to claim 35, wherein the output is performed on a connected channel. 40. The switch, comprising: a buffer configured to store a signal input from each of the plurality of channels and output the signal separately for each input channel; an output for each channel from the buffer; A switching unit for switching connection with the plurality of channels to be output, and switching between the output for each channel from the buffer and the output channel, according to a predetermined pattern and the output for each channel from the buffer. 40. The transmission control device according to claim 31, wherein the transmission control device is configured so that a plurality of are not connected to the same output channel at the same time. 41. The method according to claim 31, wherein the input of the signal to the communication network is performed by inserting a signal into the channel by a second inserting means provided in the channel. Transmission control device. 42. A plurality of node devices for connecting a plurality of terminals are connected in a ring by a plurality of channels, and at least one switch for transferring packets between the plurality of channels is provided. A first separating unit that separates a specific packet from the plurality of channels in the output of the switch; and A packet transmission control method in a communication network, comprising: a first insertion unit that inserts a channel into a channel to which the first separation unit is connected, among the channels. A receiving terminal connected to the same node device as a receiving device connected to an adjacent downstream node device or a transmitting device that transmits a packet. When a packet is sent to the end, the packet transmitted from the transmitting terminal passes through the switch, is further separated from the plurality of channels by the first separating unit, and is further separated by the first inserting unit. A transmission control method, characterized in that control is performed such that the signal is transmitted to the receiving terminal after the first separating means is inserted into the connected channel. 43. A plurality of node devices for connecting a plurality of terminals are connected in a ring by a plurality of channels, and at least one switch for transferring a packet between the plurality of channels is provided. A first separating unit that separates a specific packet from the plurality of channels in the output of the switch, and the plurality of the plurality of packets connected to the input of the switch, the specific packet separated by the first separating unit. A packet transmission control device in a communication network provided with a first insertion unit that inserts a channel into which the first separation unit is connected, wherein the node device is connected to a transmission terminal that transmits the packet. A receiving terminal connected to the same node device as a receiving device connected to an adjacent downstream node device or a transmitting device that transmits a packet. When a packet is sent to the end, the packet transmitted from the transmitting terminal passes through the switch, is further separated from the plurality of channels by the first separating unit, and is further separated by the first inserting unit. A transmission control apparatus, comprising: a control unit that controls transmission to the receiving terminal after the first separation unit is inserted into a connected channel.