JP2000032018A - Optical multiplex transmission apparatus and optical multiplex transmission method - Google Patents

Abstract

(57) [Problem] To provide a method for stably and efficiently activating each node and starting communication without providing a dedicated transmission line for an activation signal separately from an optical multiplex transmission line. SOLUTION: A master node 1 sends a bi-phase coded signal as an activation signal for switching from a sleep mode to a multiplex communication mode to all slave nodes 2a to 2n via an optical multiplex transmission line 3 and all slave nodes 2a to 2n. In the node, the valid input determining unit 33 determines whether the received signal received from the master node is a bi-phase coded signal. If the received signal is a bi-phase coded signal, the mode switching unit 34 To the multiplex communication mode to operate the interface unit 15 in the multiplex communication mode, and the AND circuit 12 permits communication with another node when the received signal is a bi-phase coded signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex communication mode in which a plurality of nodes connected to a common optical multiplex transmission line perform multiplex communication via a multiplex transmission interface provided in the node. The present invention relates to an optical multiplex transmission device and an optical multiplex transmission method capable of switching between a sleep mode and a sleep mode, and more particularly to an optical multiplex transmission device and an optical multiplex transmission method for switching from a sleep mode to a multiplex communication mode without providing a transmission line dedicated to a start signal About.

[0002]

2. Description of the Related Art In recent years, a vehicle is equipped with an optical multiplex transmission device for performing multiplex communication. In this optical multiplex transmission device, a plurality of nodes are connected to a common optical multiplex transmission line such as an optical fiber. It is configured.

Each node is provided with a multiplex communication interface for multiplexing and transmitting / receiving data, and a microcontroller provided in each node is provided via the multiplex communication interface and an optical multiplex transmission line. Data is transmitted and received between each other.

To minimize power consumption, each node has a multiplex communication mode for performing multiplex communication via a multiplex transmission interface, and a sleep mode for suspending the multiplex transmission interface to reduce current consumption. Is provided.

[0005] Normally, the node is operated in the sleep mode to suppress wasteful power consumption, and when a predetermined start-up condition is satisfied, the start-up signal changes the operation state of the microcontroller to the multiplex transmission interface for operating the multiplex transmission interface. Switching to communication mode.

FIG. 6 is a block diagram showing the configuration of a conventional optical multiplex transmission apparatus of this type. FIG. 7 shows a detailed configuration block diagram of a slave node provided in the optical multiplex transmission device, and FIG. 8 shows a detailed configuration block diagram of a master node provided in the optical multiplex transmission device.

In the optical multiplex transmission apparatus shown in FIG. 6, a master node 101 and a plurality of slave nodes 102a to 102n controlled by the master node 101 are connected to an optical multiplex transmission line 103 (103a to 103) such as an optical fiber.
According to n), the connection is made in a ring shape and the multiplex communication signal is transmitted in the direction of the arrow.

In each node, Rx indicates reception of a multiplex communication signal, and Tx indicates transmission of a multiplex communication signal. Also, a transmission line 104 dedicated to a start signal for transmitting a start signal from the master node 101 to each of the slave nodes 102a to 102n is provided.

Each slave node 102a-1 shown in FIG.
02n is an O / E converter 1 that converts an optical signal into an electric signal.
11, an AND circuit 112, a clock extracting unit 113 for extracting a clock signal from a signal from the AND circuit 112, and a decoder 11 for decoding a signal from the AND circuit 112
4. Interface section 115 for multiplex transmission, microcontroller 116 for controlling each section, a plurality of functional devices 117a to 117n such as a cassette deck, a compact disk (CD) and an amplifier, and an encoder for encoding transmission data from the interface section 115 118, an E / O converter 119 for converting an electric signal into an optical signal.

[0010] The master node 101 shown in FIG.
E converter 121, AND circuit 122, clock extraction unit 1
23, a decoder 124, a multiplex transmission interface 125, a microcontroller 126, a plurality of functional devices 127a to 127n, an encoder 128, an E / O converter 129, and a main clock generator 130.

Here, the transmission line dedicated to the activation signal is provided for the following reason. (1) First, the O / E converter 1
When the power of the power supply 11 is turned on, the O / E converter 111 performs an unstable operation. That is, the O / E converter 111 outputs an unstable electric signal even though there is no optical signal input.

(2) The O / E converter 111 is susceptible to external noise.
When the O / E converter 111 operates in an unstable manner, the clock extracting unit 113 and the encoder 114 operate in an unstable manner.

As described above, the start signal transmission line 104 is provided separately from the optical multiplex transmission line 103, which is a data transmission line, and at the time of start after the main power is turned on, an arbitrary node, for example, the master node 101 is connected. The start signal is transmitted to all slave nodes 102 via the start signal transmission line 104.
a to 102n.

In each of the slave nodes 102a to 102n, when the microcontroller 116 receives the activation signal, the microcontroller 116 switches the interface unit 115 from the sleep mode to the multiplex communication mode.

Further, the microcontroller 116 having received the start signal outputs an input permission signal to the AND circuit 112. As a result, the AND circuit 112 conducts, and the O / E
The signal from the converter 111 is sent to the clock extraction unit 113 and the encoder 118 via the AND circuit 112. Thereafter, a communication start command is sent from the master node 101 to all slave nodes, and communication is started.

As described above, all the slave nodes 102
a to 102n shift from the sleep mode to the multiplex communication mode, and bidirectional communication can be performed between the nodes via the optical multiplex transmission path 103.

[0017]

However, in the conventional optical multiplex transmission apparatus, the slave node can be started stably by the start signal, but separately from the optical multiplex transmission line which is a data transmission line. However, a transmission line dedicated to the activation signal had to be provided. For this reason, there is a problem that the line saving effect due to the use of the multiplex communication is impaired. Also,
Arrangement of the transmission line dedicated to the start signal has become complicated or costly.

Further, as described above, despite no optical signal input, the O / E converter 111 outputs an unstable electric signal, or the O / E converter 111 generates an O / E signal due to external noise.
When the E converter 111 operates in an unstable manner, the AND circuit 11
2 is turned on and communication is started.

The present invention provides an optical multiplex transmission apparatus and an optical multiplex transmission method capable of starting each node stably and efficiently to start communication without providing a start signal dedicated transmission line separately from a data transmission line. The task is to provide.

[0020]

The present invention has the following arrangement to solve the above-mentioned problems. According to the first aspect of the present invention, a plurality of nodes are connected to an optical multiplex transmission line, and each node communicates with another node via a multiplex transmission interface unit provided in the node. An optical multiplex transmission device capable of switching between a multiplex communication mode in which a node performs multiplex transmission and a sleep mode in which an interface unit is suspended, wherein any one of the plurality of nodes is configured to switch from the sleep mode to the multiplex mode. A start signal for switching to the communication mode is transmitted to all other nodes via the optical multiplex transmission line, and all the other nodes are
A determining unit that determines whether a received signal received from the one node is the start signal, and changing from the sleep mode to the multiplex communication mode when the determining unit determines that the received signal is the start signal. A mode switching unit that switches the interface unit to operate in the multiplex communication mode, and a communication permission unit that permits communication with the other node when the determination unit determines that the received signal is the activation signal. And characterized in that:

According to the first aspect of the present invention, when one node sends a start signal to all the other nodes via the optical multiplex transmission line, the determination units of all the other nodes transmit the start signal from the one node. The mode switching unit determines whether the received signal is an activation signal, and switches the mode from the sleep mode to the multiplex communication mode when the received signal is determined to be the activation signal to operate the interface unit in the multiplex communication mode,
The communication permitting unit permits communication with another node when it is determined that the received signal is a start signal.

Accordingly, there is no need to provide a dedicated transmission line for the activation signal separately from the optical multiplex transmission line, and each node can be activated stably and efficiently to start communication.

According to a second aspect of the present invention, there is provided a photoelectric conversion unit for converting the optical signal, which is the received signal, into an electric signal, and a counting means for counting the number of pulses of the electric signal converted by the photoelectric conversion unit in a certain period. The determination unit determines whether or not the count value counted by the counting means is within an allowable error range with respect to a predetermined value, and when the count value is within the allowable error range, the reception signal Is determined as the activation signal.

According to the second aspect of the present invention, the counting means counts the number of pulses of the electric signal converted by the photoelectric conversion unit in a certain period, and the determination unit determines that the counted value is an allowable error with respect to the predetermined value. The mode switching unit and the communication permitting unit can be operated to determine whether the received signal is within the range, and when the count value is within the allowable error range, to determine the received signal as the activation signal.

According to the third aspect of the present invention, the communication permission unit includes:
When the determination unit determines that the received signal is the activation signal, input of an electric signal from the photoelectric conversion unit to the interface unit is permitted.

According to the third aspect of the present invention, the communication permission unit includes:
When the determination unit determines that the received signal is the activation signal, the input of the electric signal from the photoelectric conversion unit to the interface unit is permitted, so that the nodes can communicate with each other.

According to a fourth aspect of the present invention, the plurality of nodes are connected in a ring by the optical multiplex transmission line.

According to a fifth aspect of the present invention, each of a plurality of nodes connected to an optical multiplex transmission line communicates with another node via a multiplex transmission interface provided in the node. An optical multiplex transmission method capable of switching between a multiplex communication mode in which each node performs multiplex transmission and a sleep mode in which an interface unit is suspended, wherein any one of the plurality of nodes includes the sleep mode. Sends an activation signal for switching to the multiplex communication mode to all other nodes via the optical multiplex transmission line, and all the other nodes receive the activation signal received from the one node as the activation signal. The sleep mode is switched to the multiplex communication mode when the received signal is determined to be the start signal, and The Eisu unit is operated in the multiplex communication mode, and permits communication with the other nodes when the received signal is determined to be a said activation signal.

According to a sixth aspect of the present invention, the optical signal, which is the received signal, is converted into an electric signal, the number of pulses of the converted electric signal is counted in a certain period, and the counted value is an allowable value for a predetermined value. It is determined whether or not the received signal is within an error range, and when the count value is within the allowable error range, the received signal is determined to be the start signal.

According to a seventh aspect of the present invention, when the received signal is determined to be the activation signal, input of an electric signal from the photoelectric conversion unit to the interface unit is permitted.

[0031] The invention of claim 8 is characterized in that the plurality of nodes are connected in a ring by the optical multiplex transmission line.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the optical multiplex transmission apparatus and the optical multiplex transmission method of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration block diagram of an optical multiplex transmission apparatus according to an embodiment of the present invention.

In the optical multiplex transmission apparatus shown in FIG. 1, a master node 1 and a plurality of slave nodes 2a to 2n controlled by the master node 1 are connected in a ring form by an optical multiplex transmission line 3 (3a to 3n) such as an optical fiber. And multiplex communication signals, data and commands are transmitted in the direction of the arrow. The master node 1 sends commands, signals, and data to all the slave nodes 2a to 2n, and controls each of the slave nodes 2a to 2n.

Each of the slave nodes 2a to 2n basically includes a 0 / E converter 11, a communication permission unit 12, which is a gate circuit such as an AND circuit, an interface unit 15, a microcontroller 16, and a valid input determination unit 33. Have. These configurations will be described in detail with reference to FIG.

The master node 1 has a 0 / E converter 21,
It has a communication permitting section 22 composed of a gate circuit such as an AND circuit, an interface section 25, a microcontroller 26, and a valid input determining section 43. For these configurations,
This will be described in detail with reference to FIG.

FIG. 2 shows a detailed configuration block diagram of a slave node provided in the optical multiplex transmission apparatus according to the embodiment. Each of the slave nodes 2a to 2n includes a 0 / E converter 1
1, AND circuit 12, clock extraction unit 13, decoder 1
4, interface unit 15, microcontroller 1
6, functional equipment 17a to 17n, encoder 18, E / O
It has a converter 19.

The 0 / E converter 11 converts the input optical signal into an electric signal and outputs the electric signal to the AND circuit 12 and the microcontroller 16. When an input permission signal is input from the microcontroller 16, the AND circuit 12
An electric signal from the / E converter 11 is output to the clock extracting unit 13 and the decoder 14. For the input permission signal,
The microcontroller 16 will be described in detail.

The clock extracting unit 13 extracts a clock from the multiplexed communication signal from the 0 / E converter 11 via the AND circuit 12, and outputs the extracted clock to the decoder 14,
Output to the interface unit 15 and the encoder 18.

The decoder 14 decodes the multiplex communication signal from the 0 / E converter 11 via the AND circuit 12, and uses the decoded signal as received data as an interface unit 15.
Output to The interface unit 15 is a multiplex communication interface for multiplexing data and performing transmission and reception, and sends data received from the decoder 14 to the microcontroller 16 and the encoder 18.

The microcontroller 16 is capable of switching between a sleep mode in which the interface unit 15 is inactive and a multiplex communication mode in which multiplex communication is performed. The devices 17a to 17n are controlled. The plurality of functional devices 17a to 17n include a cassette deck, a CD,
Radios, amplifiers, etc.

The encoder 18 is connected to the interface 1
5 is encoded and sent to the E / O converter 19. The E / O converter 19 converts the encoded electric signal from the encoder 18 into an optical signal and sends the optical signal to the optical multiplex transmission path 3.

The microcontroller 16 has a counter 31, a timer 32, a valid input judging unit 33, and a mode switching unit 34. The counter 31 counts the number of pulses of the signal from the 0 / E converter 11 during a fixed time (timer time). The timer 32 sets the timer time.

The valid input determining section 33 determines whether or not the count value counted by the counter 31 during the timer time matches a predetermined value or is within an allowable error range with respect to the predetermined value.

When the count value matches the predetermined value or is within an allowable error range with respect to the predetermined value, the valid input determining section 33 regards that an optical signal including valid data has been input (that is, the optical signal has been input). Assuming that a valid bi-phase coded signal as a start signal for switching from the sleep mode to the multiplex communication mode has been input), the signal from the 0 / E converter 11 is output to the clock extraction unit 1.
3 and an input permission signal for permitting input to the decoder 14 is output to the AND circuit 12.

When it is determined that the input signal is a valid bi-phase coded signal, the mode switching unit 34 switches from the sleep mode to the multiplex communication mode and operates the interface unit 15 in the multiplex communication mode.

FIG. 3 shows a detailed block diagram of a master node provided in the optical multiplex transmission apparatus according to the embodiment. The master node 1 includes an O / E converter 21, an AND circuit 22, a clock extracting unit 23, a decoder 24, an interface unit 25, a microcontroller 26, functional devices 27a to 27n, an encoder 28, an E / O converter 29,
It has a main clock generator 30.

The main clock generator 30 generates a reference main clock and outputs it to the encoder 28.
The encoder 28 encodes transmission data from the interface unit 25 using the main clock generated by the main clock generation unit 30 and outputs the encoded data to the E / O converter 29.

The encoder 28 generates a bi-phase coded signal using the main clock generated by the main clock generator 30 and outputs it to the E / O converter 29 when each slave node is started. This bi-phase coded signal is used as a start signal for switching from the sleep mode to the multiplex communication mode.

The O / E converter 21 and the AND circuit 2
2. Clock extraction unit 23, decoder 24, interface unit 25, microcontroller 26, functional device 27
Since a to 27n and the E / O converter 29 have the same configuration as the corresponding part of the slave node, detailed description thereof is omitted here.

The microcontroller 26 has a counter 4
1, a timer 33, a valid input determining unit 43, and a mode switching unit 44. Note that the counter 41, the timer 33, the valid input judging unit 43, and the mode switching unit 44 have the same configuration as the corresponding parts of the slave node, and a detailed description thereof will be omitted here.

Each of the master node 1 and the slave nodes 2a to 2n stores its own device address, source address, destination address, data, and the like. The master node 1 and the slave nodes 2a to 2n take in the received data if the data is addressed to itself,
If the received data is data not addressed to itself, the data is sent to the optical multiplex transmission line 3 as it is, and if there is data to be transmitted, the data to be transmitted is sent to the optical multiplex transmission line 3.

Next, the operation of the optical multiplex transmission apparatus thus configured, that is, the optical multiplex transmission method will be described in detail with reference to the drawings. Here, the operation at the time of starting the network will be described.

First, in order for the master node 1 to activate all the slave nodes 2a to 2n, the master node 1
, The encoder 28 is connected to the main clock generator 3
0, a bi-phase encoded signal is generated using the main clock generated by the main clock 0, and the generated signal is converted to an E / O converter 29
The optical signal is converted into an optical signal and transmitted to the slave node 2a via the optical multiplex transmission line 3a.

On the other hand, in the slave node 2a, the optical signal from the master node 1 is converted into an electric signal by the E / O converter 11, and the electric signal is sent to the microcontroller 16.

In the microcontroller 16, the number of pulses of the input signal is counted by the counter 31, and the valid input judging section 33 judges whether or not the count value at the elapse of the timer time matches, for example, a predetermined value. .
If the count value matches the predetermined value, it is determined that the input signal is a valid bi-phase coded signal.

When it is determined that the input signal is a valid bi-phase coded signal, the mode switching unit 34 switches from the sleep mode to the multiplex communication mode to operate the interface unit 15 in the multiplex communication mode. That is, the node is activated.

When it is determined that the input signal is a valid bi-phase coded signal, the valid input determining section 33 outputs an input permission signal to the AND circuit 12 and outputs the signal to the O / E converter. Then, the AND circuit 12 between the output side of the decoder 11 and the input side of the decoder 14 and the clock extraction unit 13 is made conductive to enable communication.

Next, the encoder 18 uses the clock (main clock) extracted by the clock extraction unit 13.
Generates a bi-phase coded signal, and transmits the generated bi-phase coded signal to the next node, that is, the slave node 2b. Each slave node from the slave node 2b to the slave node 2n operates similarly to the operation of the slave node 2a.

Further, the master node 1 which has received the optical signal from the last slave node 2n also determines by the valid input determining section 43 that a valid bi-phase coded signal has been input, and thereafter, the O / E The AND circuit 22 between the output side of the converter 21 and the input side of the decoder 14 and the clock extraction unit 23 is brought into conduction so that communication is possible.

Finally, the master node 1 can establish a network including the master node and a plurality of slave nodes by transmitting a communication start command to all the slave nodes 2a to 2n.

Next, FIG. 4 shows a flowchart of the operation of the master node provided in the optical multiplex transmission apparatus according to the embodiment. FIG. 5 shows a flowchart of the operation of the slave node provided in the optical multiplex transmission device according to the embodiment. Here, the operation at the time of starting the network will be described.

First, the operation of the master node will be described with reference to FIG. The encoder 28 generates a bi-phase coded signal using the main clock generated by the main clock generation unit 30 (step S11), and transmits the bi-phase coded signal to the first slave node 2a (step S13). This bi-phase coded signal is a signal in which all transmission data is set to “1” using a bi-phase code.

On the other hand, the master node 1 determines whether a signal has been received from the last slave node 2n (step S15). If a signal has been received, the timer 42 sets the timer time from the time of signal reception. (Step S17).

Then, the counter 41 counts the number of pulses of the received signal during the timer time (step S1).
9), the valid input determination unit 43 determines whether the count value counted by the counter 41 is a predetermined value or within an allowable error range (step S21).

For example, when starting a communication network in which the data transmission rate is 1 Mbps, if the transmission data is all 1 and the timer time is 1 ms, the predetermined value N is '10
00 '. Therefore, it is determined whether the count value is “1000”. Further, the allowable error range may be, for example, ± 5% of the predetermined value N.

Here, when the count value is a predetermined value or within the allowable error range, the valid input determining section 43 determines that the received signal is a valid bi-phase coded signal, and outputs the input permission signal as an AND signal. The signal is output to the circuit 22 (step S23), and the AND circuit 22 is turned on to permit communication (step S25).

Further, a communication start command is transmitted to all the slave nodes 2a to 2n (step S27), and a network is established (step S29).

Next, the operation of the slave node will be described with reference to FIG. First, each of the slave nodes 2a to 2n
It is determined whether a signal has been received from another node (step S31). If a signal has been received, the timer 32 sets a timer time based on the signal from the O / E converter 11 (step S33). ).

Then, the counter 31 counts the number of pulses of the received signal during the timer time (step S3).
5) The valid input determining section 33 determines whether the count value counted by the counter 31 is a predetermined value or within an allowable error range (step S37).

Here, when the count value is a predetermined value or within the allowable error range, the mode switching unit 34
Assuming that the input signal is a valid bi-phase coded signal, the mode is switched from the sleep mode to the multiplex communication mode, and the interface unit 15 is operated in the multiplex communication mode.

When the count value is a predetermined value or within the allowable error range, the valid input determination unit 33
The received signal is determined to be a valid biphase encoded signal, and an input permission signal is output to the AND circuit 12 (step S3).
9) Then, the AND circuit 12 is made conductive to permit communication (step S41). Further, a bi-phase coded signal is transmitted to the next node (step S43).

As described above, according to the optical multiplex transmission apparatus of the embodiment, when a signal is input to each node, the counter and the timer count the number of pulses of the signal in a certain period, and the count value Is a predetermined value or within an allowable error range, the signal is regarded as a valid signal, the AND circuit is turned on, and a signal from the O / E converter is output to the decoder and the clock extracting unit. Communicable state.

When the received signal is regarded as a valid signal, that is, when the signal is regarded as an activation signal for switching from the sleep mode to the multiplex communication mode, the microcomputer controller 16 sets the interface unit 15 to The interface section 15 is operated in the multiplex communication mode by switching from the sleep mode to the multiplex communication mode.

Therefore, in order to transmit a multiplex communication signal on the optical multiplex transmission line 3 and to transmit an effective bi-phase coded signal on the optical multiplex transmission line 3 at the time of starting, the optical multiplex transmission line 3 which is a data transmission line is used. Separately, there is no need to provide a dedicated transmission line for the activation signal.

Further, only when the valid input determining section determines that the received signal is a valid input, the node is activated, so that each node can be activated stably and efficiently.

Further, even if the O / E converter operates unstable due to external noise or the like, the valid input determination section 33 does not determine the noise signal as a valid signal, so that the AND circuit becomes non-conductive, and Will not start carelessly.

The present invention is not limited to the optical multiplex transmission device according to the above-described embodiment. In the embodiment, whether or not data is valid data is determined using a bi-phase coded signal. For example, a Manchester code may be used instead of using a bi-phase coded signal.

Further, the present invention is also effective in the case where the signal transmission including a clock component such as a biphase coded signal is not performed in the embodiment. For example, when starting a network of 100 kps asynchronous communication (when the data length is 8 bits, the MSB first, the start bit is “0”, and the stop bit is “1”), the master node 1 is set to “10”.
Continue transmitting 101010 'data. Timer time is 1m
If S, it is possible to determine whether the received signal is valid data by determining whether the predetermined value N is '50'.

The configuration of the optical multiplex transmission apparatus is not limited to a ring-shaped network, but a local area network (L) configured by connecting one master node and several slave nodes to a common bus.
AN).

[0080]

According to the first and fifth aspects of the present invention,
When one node sends a start signal to all other nodes via the optical multiplex transmission line, the determination units of all other nodes determine whether the received signal received from one node is a start signal. The mode switching unit switches from the sleep mode to the multiplex communication mode to operate the interface unit in the multiplex communication mode when it is determined that the reception signal is the activation signal, and the communication permission unit determines that the reception signal is the activation signal. If it is determined that the communication with another node is permitted.

Therefore, it is not necessary to provide a dedicated transmission line for the activation signal separately from the optical multiplex transmission line, and each node can be activated stably and efficiently to start communication.

According to the second and sixth aspects of the present invention, the counting means counts the number of pulses of the electric signal converted by the photoelectric conversion unit in a certain period, and the determination unit determines that the counted value is a predetermined value. The mode switching unit and the communication permitting unit can be operated to determine whether or not the value is within an allowable error range, and when the count value is within the allowable error range, to determine that the received signal is a start signal.

According to the third and seventh aspects of the present invention, the communication permitting section permits input of an electric signal from the photoelectric conversion section to the interface section when the determining section determines that the received signal is an activation signal. Therefore, communication can be performed between the nodes.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing an optical multiplex transmission apparatus according to an embodiment of the present invention.

FIG. 2 is a detailed configuration block diagram of a slave node provided in the optical multiplex transmission device according to the embodiment.

FIG. 3 is a detailed configuration block diagram of a master node provided in the optical multiplex transmission device according to the embodiment.

FIG. 4 is a flowchart showing an operation of a master node provided in the optical multiplex transmission device according to the embodiment.

FIG. 5 is a flowchart showing an operation of a slave node provided in the optical multiplex transmission device according to the embodiment.

FIG. 6 is a configuration block diagram illustrating an example of a conventional optical multiplex transmission device.

FIG. 7 is a detailed configuration block diagram of a slave node provided in a conventional optical multiplex transmission device.

FIG. 8 is a detailed configuration block diagram of a master node provided in a conventional optical multiplex transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Master node 2a-2n Slave node 3 (3a-3n) Transmission line 11,21 O / E conversion part 12,22 AND circuit 13,23 Clock extraction part 14,24 Decoder 15,25 Interface part 16,26 Microcontroller 17a To 17n, 27a to 27n Functional equipment 18, 28 Encoder 19, 29 E / O converter 30 Main clock generation unit 31, 41 Counter 32, 33 Timer 33, 43 Valid input determination unit 34, 44 Mode switching unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Nishiyama 2771 Ooka, Numazu City, Shizuoka Prefecture Inside Yazaki Corporation (72) Inventor Akira Hotsuki 2771 Ooka, Numazu City, Shizuoka Prefecture Inside Yazaki Corporation (72) Inventor Nakajima Winner: 2771 Ooka, Numazu-shi, Shizuoka Yazaki Sogo Co., Ltd. (72) Inventor Yoshinori Saito 2771 Ooka, Numazu-shi, Shizuoka Yazaki Sogo Co.

Claims (8)

[Claims] A plurality of nodes are connected to an optical multiplex transmission line, each node communicates with another node via a multiplex transmission interface unit provided in the node, and each node communicates with another node. An optical multiplex transmission device capable of switching between a multiplex communication mode for performing multiplex transmission and a sleep mode in which an interface unit is suspended, wherein any one of the plurality of nodes is configured to switch from the sleep mode to the multiplex communication mode. To the other nodes via the optical multiplex transmission line, and the other nodes determine whether the received signal received from the one node is the start signal. A determining unit, switching to the multiplex communication mode from the sleep mode when the determining unit determines that the received signal is the activation signal; A mode switching unit that operates the interface unit in the multiplex communication mode, and a communication permission unit that permits communication with the other node when the reception signal is determined to be the activation signal by the determination unit. An optical multiplex transmission device comprising: 2. A photoelectric conversion unit that converts an optical signal, which is the received signal, into an electric signal, and a counting unit that counts the number of pulses of the electric signal converted by the photoelectric conversion unit in a certain period, The determining unit determines whether or not the count value counted by the counting unit is within an allowable error range with respect to a predetermined value. If the count value is within the allowable error range, the receiving unit converts the received signal into the start signal. 2. The optical multiplex transmission apparatus according to claim 1, wherein: 3. The communication permission unit, wherein when the determination unit determines that the received signal is the activation signal, input of an electric signal from the photoelectric conversion unit to the interface unit is permitted. The optical multiplex transmission device according to claim 2. 4. The optical multiplex transmission apparatus according to claim 1, wherein the plurality of nodes are connected in a ring shape by the optical multiplex transmission line. 5. Each of a plurality of nodes connected to an optical multiplex transmission line communicates with another node via a multiplex transmission interface unit provided in the node, and each node communicates with another node. An optical multiplex transmission method capable of switching between a multiplex communication mode for performing multiplex transmission and a sleep mode in which an interface unit is suspended, wherein any one of the plurality of nodes is configured to switch from the sleep mode to the multiplex communication mode. A start signal for switching to is transmitted to all other nodes via the optical multiplex transmission line, and all the other nodes determine whether a received signal received from the one node is the start signal. Switching the sleep mode to the multiplex communication mode when the reception signal is determined to be the activation signal, and An optical multiplex transmission method that operates in a multiplex communication mode and permits communication with the another node when it is determined that the received signal is the activation signal. 6. The optical signal as the received signal is converted into an electric signal, and the number of pulses of the converted electric signal is counted in a certain period, and the counted value is within an allowable error range with respect to a predetermined value. 6. The optical multiplex transmission method according to claim 5, wherein it is determined whether the received signal is the start signal when the count value is within the allowable error range. 7. The optical multiplex transmission method according to claim 6, wherein when the received signal is determined to be the activation signal, input of an electric signal from the photoelectric conversion unit to the interface unit is permitted. . 8. The optical multiplex transmission method according to claim 5, wherein the plurality of nodes are connected in a ring shape by the optical multiplex transmission line.