JPH04199936A - High-speed ring LAN and slot access control method in high-speed ring LAN - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a high-speed local, area, network system (hereinafter abbreviated as LAN) and a slot access control method in a high-speed LAN. The present invention relates to a system for mutually communicating communication information and management information between terminal devices or communication networks connected to a node device, and an information slot access control method between a transmission path and a node.

[Prior Art 1] Research and development is being carried out on high-speed ring LANs that collectively accommodate multimedia such as data, audio, and images. A high-speed ring LAN that accommodates multimedia requires transmission of asynchronous information that is standby information, synchronization information of synchronous continuous information such as audio and moving images, and management information that manages the network system. Here, management information is divided into information for controlling the transmission path and information for controlling each node, but management information is used to handle failures, statistical information collection, and downloads such as distributing programs to each node. In some cases, a fairly large bandwidth is required. A conventionally known high-speed ring LAN for accommodating multimedia employs a slotted ring system. That is, this is a method in which a plurality of slots for carrying data on a transmission path are arranged on a frame, the slots are made to circulate, and information data is carried in the slots and transmitted. A slot consists of a fixed length number of bytes consisting of a header part and an information part. A slot is a format that includes a packet header of a certain number of bytes and a terminal information area of a certain number of bytes, in which control information, address information, and management information are placed in the packet header part, and asynchronous information or synchronous information of the terminal is placed in the terminal information area. is taken. High-speed ring LA that accommodates multimedia
As a literature on N. IEICE Spring National Conference (1989) B-4
Development of 82410Mbps multimedia highway system, B-483410Mbps multimedia highway system access control method, B
-484410Mbps Multimedia Highway System Monitoring and Control System, FtJJITSU, v
ol, 40. No, 1. pp35-40.1989 1
Month FACOM2890? One example is the Lucimedi 7 Highway System. [Problems to be Solved by the Invention] In the above-mentioned conventional technology, the information area of a slot is used to transmit asynchronous information and synchronous information, and the frame header or packet header is used to transmit management information. As a result, access control between management information and the other two types of information differs, resulting in the problem of complicated access control and the need to send slots many times when attempting to perform more advanced management. Therefore, there was a problem that management information could not be transmitted efficiently. Furthermore, the access methods for asynchronous information slots and synchronous information slots are different, and for synchronous information slots, a frame memory is constructed of RAM, and a microprocessor or the like is used to perform complicated control. Therefore, there is a limit to signal processing speed. Therefore, the main object of the present invention is to provide a branch LAN for asynchronous information.
and high-speed ring L that connects communication devices for synchronization information, etc.
An object of the present invention is to realize a method and a node device for efficiently transmitting management information in an AN. Another object of the present invention is to provide a high-speed ring L that can be accessed at high speed.
The purpose is to realize a node device for AN. Still another object of the present invention is to realize a slot access control method that allows each node to access asynchronous information, synchronous information, and management information fairly and efficiently.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides a management information slot together with asynchronous information and synchronous information, and includes the type of asynchronous information, synchronous information, or management information in the header part of the slot. In addition, in order to enable high-speed access, an access block for accessing the slot from the transmission path for the node device, and
It is configured by providing a port that connects the above block with a branch line LAN or a communication device for synchronization information, and a control block that controls the transmission and reception of management information used for control between mutual nodes, and the access block is a transmission path. means for branching slots entered from the transmission route into two directions, a relay route and a reception route, a delay block provided on the relay route, and a means for branching the slots entered from the transmission route, provided on the reception route, for determining the delivery destination of the slots entered from the transmission route. and the reception judgment block that determines. A transmission determination block is provided to select the transmission information from the port and the control block and the output of the delay block to create a transmission slot. In particular, the delay time of the delay block is such that the synchronization information slot received from the transmission path connects a synchronization port, which is an adapter that connects the block with a means for accessing from the transmission path, to a communication device for synchronization information. The delay amount is set to be the same as the delay amount required for returning to the block via the synchronization port and the transmission determination circuit, and only a line without delay is configured between the synchronization port and the transmission determination circuit. [Operation] By transmitting management information together with asynchronous information and synchronous information using slots, it becomes possible to handle asynchronous information, synchronous information, and management information in the same way, so depending on the LAN system, when necessary, It becomes possible to transmit sufficient management information, and a system with high communication efficiency can be realized. Furthermore, by transmitting management information using slots, a larger transmission band can be obtained compared to transmission using frame headers, and furthermore, the transmission band can be easily changed. Furthermore, in the node device constituting the high-speed ring LAN according to the present invention, time alignment between the relay line and the receiving line can be achieved by simply providing a delay block with a delay amount of several bytes on the relay line. , a large capacity RAM and a processor to control it are not required between the synchronization port and the transmitter of the node. It is believed that the above and other features and effects of the present invention will become clearer from the description of the following examples. [Example 1] Hereinafter, an example of the present invention will be explained with reference to the drawings. FIG. 1 is an overall configuration diagram of one embodiment of a high-speed ring LA, N according to the present invention. This high-speed ring LAN consists of a transmission line 300 in which one master node 100 and a plurality of slave nodes 200 are multiplexed.
are connected in a ring shape. A single branch line LAN for asynchronous information such as a branch line LAN 400 or a communication device 560 for synchronous information is connected to the master node 100 and each slave node 200, and a plurality of branch lines LAN 400 or the like or communication devices 560 for synchronous information are connected to each other for mutual exchange of multiple terminals at 6°. By doing so, communication between the terminal 600 and the communication device 500 is performed. Although four multiplexed lines are shown as the transmission line 300, the transmission line 300 also includes one in which a single line is used and signals corresponding to each line are time-division multiplexed. The master node 100 is a slave node 2 which will be explained below.
In addition to the functions of 00, there are functions to circulate a frame containing one or more fixed-length slots on the transmission path 300, a function to allocate bandwidth for asynchronous information, synchronous information, and management information slots, and a function to allocate bandwidth for slots to which bandwidth has been allocated. It has a function to monitor the operational status. Here, the asynchronous information slot is a slot for transferring wait time information, and is used, for example, for communication between an asynchronous port to which an FDDI and a branch LAN are connected. The synchronization information slot is a slot for transferring time-division multiplexed information, and is used, for example, for communication between synchronization ports to which PBXs and the like are connected. Furthermore, the management information slot is a slot for transferring control information between nodes, and is used for communication between control blocks 230 within each node. The slave node 200 stores one of the 200
As shown in detail as a, a loop access block 210 transmits and receives information to and from one of the plurality of transmission paths 300a, and a communication device 400 for asynchronous information between the loop access block 210 and a communication device 400 for asynchronous information or between the loop access block 210 and synchronous information. It has a port 220, which is an interface for connecting a communication device 500, etc., and a control block 230, which controls transmission and reception of management information used for control with other nodes. A feature of the invention is, in particular, that the loop access block 210
and the structure of the information slots transmitted on the transmission path 300. FIG. 2 is a diagram for explaining the format of information transmitted on the transmission path 300, and (a) is one of the formats of the slots flowing on the transmission path 300 in the embodiment shown in FIG.
Give an example. The number at the bottom indicates the number of constituent bits. In the figure, B is a usage status bit (busy bit) that indicates the usage status of the slot, and it is in an empty state (unused).
It Q II when in use, It I P when in use
Represented by +. S is a bit that indicates the slot type,
2 bits are allocated. "Asynchronous information slot"
When it is a "slot for management information", it shows II OOIf, when it is a "slot for management information" it shows II O11+, and when it is a "slot for synchronization information" it shows "10". Note that ``11'' is reserved for the future.R is a bit that indicates a release request, and 1 bit is allocated.A node requesting transmission sets this R bit from 0'' to 1n to reserve an empty slot ( B waits for It O11 slot). On the other hand, the node that sent the slot can use the spontaneous slot continuously when this R bit is It 071, and unconditionally releases the slot when it is 111 II (setting bit B to 0"). A indicates the access level (priority). Transmission is permitted when the access level of the slot for which transmission is desired is higher than or equal to the access level of the slot sent from the transmission path. Now. Assume that 2 bits are assigned to access level A, and the level has increased from A=Oo to 11.At this time, if the access level A of the slot desired for transmission is 10, then
Transmission permission is given to the slot whose access level A is 00.01.10 sent from the transmission path. This bit is mainly used for asynchronous slots, but
Application to management slots is also possible. Ilo is a bit that identifies individual communication and broadcast communication, and is 1
Bits are assigned. 110 for “individual communication”
11. Indicates 111 II for "Broadcast communication". D.A.
N represents the destination node address, DAP represents the destination port address, SAN represents the source node address, and SAP represents the source port address. HC8 is a header check sequence and is used for error detection using the error correction code CRC in the header section. D indicates the information section. FIGS. 2(b) and 2(c) show how the slot shown in FIG. 2(a) is transmitted on the transmission line 300. FIG. In the LAN shown in FIG. 1 above, the master node 100 has four
Period 125μS + for each of the multiplets 300
A frame of 270 x 9 bytes is allocated, and one or more fixed length slots shown in (a) are placed in the virtual container VC, which is an information area within the frame, and the frame is rotated. When multiplexing transmission is performed on a single line, as shown in (b), each frame f1, f2 . , f4 are time-division multiplexed in byte units. Information of 270×9×4 bytes is transmitted during a period of 125 μs. The master node 100 also performs bandwidth allocation for asynchronous, synchronous, and management information slots, and monitors the operating status of the slots to which the bandwidth has been allocated. FIG. 3 is a block diagram showing the configuration of one embodiment of the node 200. Node 200 transfers information to the receiving node using the slot in which the usage status display bit B indicates unused, and also has the function of changing the display bit B to "used", and re-receives the slot used by the own node after going around the ring. When there is no transfer request from another node, the slot is allowed to continue to be used, and when there is a transfer request from another node, the slot is released by displaying it as unused. The asynchronous, synchronous, or management information slot taken in from the transmission line 300a is separated into a relay line with a delay adjustment block 215 and a reception line with a reception determination block 212. The reception determination block 212 checks the slot type bit S and the busy bit B of the reception slot, and outputs a reception valid signal indicating whether or not the slot is valid (0: reception determination is not performed at the port, 1: reception determination is performed at the port). ), and sends it to the control block 230 along with the reception slot via the port 220 or, if the slot is a management information slot, the management slot reception buffer 216. The port 220 receives the individual/broadcast type bit I10 and the destination node address DAN for the slot in which the valid signal is valid, and determines reception. Further, the port 220 applies the slot to be transmitted to the transmission determination block 211 via the transmission path selection block 213, the synchronous information slot directly to the transmission determination block 211, and the asynchronous information slot to the transmission determination block 211 via the asynchronous transmission buffer 214. The control block 230 also transmits the management information slot via the management slot transmission buffer 217 to the determination block 211.
Add to. The transmission determination block 211 performs transmission determination according to certain conditions based on the transmission request signal and the information in the header part.
After determining the four communication forms of transmission, release, release request, and relay, the slot is sent to the transmission path 300a. That is, a function that transfers information to the receiving node using a slot whose slot usage status display bit B indicates unused, and also changes the display bit B to "used", and when a slot used by the own node is re-received after going around the ring. , has the function of allowing the slot to continue to be used if there is no transfer request to the node, and releasing the slot by displaying it as unused if there is a transfer request to another node. Connection between node 200 and transmission line 300 is performed as follows. The slave node 200 is given the only node address within the transmission path 300, and the port 220 is given the only port address within the slave node 200. It is also assumed that the port 220 can only receive slots from fixedly assigned transmission lines. For example, port 220a receives only slots transmitted on transmission line 300a. Therefore, at the time of transmission, the source port 220 sends out a slot on the transmission path to which the destination port is connected. The asynchronous information is divided at the port 220 into fixed-length slots to which are assigned the following addresses: destination node address, source node address, destination port address, and source port address. Management information is also stored in the control block 23.
0, it is divided into fixed-length slots to which are assigned each address: destination node address, source node address, destination port address, and source port address. On the other hand, only the destination port address is added to the synchronization information, and the information is divided into fixed-length slots without adding the destination node address, source node address, or source port address. Hereinafter, the access operations of the asynchronous information slot, the synchronous information slot, and the management information slot in the node will be explained separately for the sake of clarity. Note that the following access methods are independently executed for multiplexed transmission paths. "In the case of asynchronous information slot" FIG. 4 shows, as an example, four transmission lines 300a, 3oob,
300c and 300d are multiplexed, and communication is performed using an asynchronous information slot allocated by the master node 100 for asynchronous use. The slot that enters the loop access block 210b in the slave node 20Ob from the transmission path 300a is branched into two directions, one for relay and one for reception, one for relay and one for transmission judgment block 2 via the delay adjustment block 215b.
11b, and the other one enters reception determination block 212b for reception. The delay amount of the delay adjustment block 215 is such that the synchronization information slot received from the transmission line 300 is transferred from the loop access block 210 to the synchronization port 22o, which is an adapter connecting the loop access block 210 and the communication Wt500 for synchronization information. The amount of delay (corresponding to approximately several bytes) is the same as the amount of delay required to return to the loop access block 210 again via . Note that the delay amount of the block 215 is constituted by a circuit that can be changed depending on the required delay amount of the synchronization port 220 to which it is connected. In reception determination block 212b, if the slot is for asynchronous information (slot type bit S is "OO") and is in use (busy bit B is 111 II),
Set the reception valid signal (O: Do not judge reception at the port, 1: Check reception at the port) to '1' and send it to the asynchronous port 220b along with the reception slot. In other cases, reception is valid. After setting the signal to 41011, the asynchronous port 220b along with the slot
Send to. At the port 220b, reception is determined only for slots in which the reception valid signal is tr III. Reception is determined when the slot is an individual communication (Ilo is II OII) and addressed to the self (destination node address DAN matches the own node address), and when the slot is a broadcast communication (1/G is '1'')
This is performed when the destination is the own address (the destination node address DAN matches the own group address). Note that the own group address is an address commonly assigned to nodes divided into groups. As described above, transmission line 3
00 to the loop access block 210. Next, processing in the case where the asynchronous information slot is transmitted from the asynchronous port 220 to the loop access block 210 will be described. In the case of individual communication, each asynchronous port 220 sets Ilo to 110 j+ for the slot, and also sets the destination node address to the destination node address DAN and the destination port address to the destination port address DAP. The address indicating the transmission path to which the asynchronous port of
The source node address SAN is assigned the source node address, and the source port address SAP is assigned an address indicating the transmission path to which the asynchronous port of the source is connected, and each transmission path selection block 213b, 213c, 213
d, and sends it to 213e. Transmission path selection block 213b
Now, each asynchronous port 220b. By identifying the destination port address DAP for the slots sent out from 220c, 220d, and 220e,
A slot to be sent on the transmission path 300a is selected and sent to the asynchronous information slot transmission buffer 214b. On the other hand, in the case of broadcast communication, each asynchronous port 220 sets the individual/broadcast indicator bit I10 to "1" for the slot, and sets the destination group address for the destination node address DAN. , destination port address DA
For P, specify the address for selective broadcast communication described later, and for source node address SAN, specify the source node address. And the source port address SAP is given an address indicating the transmission path to which the asynchronous port of the source is connected, and each transmission path selection block 213b, 213c, 213
d, and sends it to 213e. Selective broadcast communication refers to the destination port address DA of the slot configured for broadcast communication.
By identifying P, a transmission path for transmission is selected from among the multiplexed transmission paths and broadcast communication is performed. FIGS. 5(a) and 5(b) both show examples of selective broadcast communication for this multiplexed transmission path. Figure 5 (
In the case of a), the selected transmission path is set for the 2-bit destination port address DAP as shown in the figure. Here, if Ilo is 1 and DAP=01, transmission path A3
00a and transmission line B500b are selected, and broadcast communication is performed to the input asynchronous ports connected to this transmission line. In contrast, Ilo is '0''D
If the AP is "01" (7), then the communication will be individual communication in which the transmission path B500b is selected. In the case of FIG. 4(b), 4 bits are allocated to the destination port address DAP. Here Ilo is 111 ft and DAP is “0101”
In this case, transmission path A 300a and transmission path C 300c are selected, and broadcast communication is performed to all asynchronous ports connected to these transmission paths. Note that in cases not shown here, for example, when Ilo is "0" and DAP is "0011", transmission path A 300a and transmission path B 500b are selected, or transmission of this slot is interrupted, and It is assumed that there is a transmission error on the asynchronous port 220, and logs are collected. The case where 4 bits are allocated to DAP is shown above, but of these 4 bits, for example, 2 bits may be allocated to busy bit B and release request bit R, and 2 bits may be allocated to DAP. FIG. 6 shows the structure of the asynchronous transmission buffer 214 for storing the asynchronous information slot sent from the asynchronous port. The asynchronous transmission buffer 214 used is FI.
It is assumed that the asynchronous transmission buffer 214 is an F○ memory, and no overtaking of transmission slots is performed in the asynchronous transmission buffer 214. The structure of the asynchronous transmission buffer 214 is as follows:
If one loop access block 210 is provided for each loop access block 210 for each asynchronous port 220, the asynchronous access block 210 for broadcast communication is always The area of the transmission buffer 214 is secured. That is, as shown in FIG. 6(a), the asynchronous transmission buffer 214, which has a structure divided into an area common to individual and broadcast communications and an area dedicated to broadcast communications, is connected to a loop access block for each transmission path. One each is provided in 210. As shown in FIG. 6(b) for M, an asynchronous transmission buffer 214 having a structure having a common area for individual and broadcast communication is provided in the loop access block 210 for each port for one transmission path. It can also be provided in In this case. Even if continuous individual communication is performed from other ports, broadcast communication will not be disturbed. There is no need to have a structure divided into areas. Note that when the transmission buffer 214 has the configuration shown in FIG.
There may be a conflict between 20 and 20. To deal with this, a circuit is provided in the loop access block 210 that shifts the transmission priority of the asynchronous information slots sent out from each asynchronous port 220 for each transmission. The case of the asynchronous transmission buffer 214b in FIG. 6(b) is as follows. Assuming that transmission priorities are given in the order of asynchronous transmission buffers 214b-1, 2, 3, and 4, slots in asynchronous transmission buffer 214b-1 can be used for transmission first. At the next transmission opportunity, if the transmission priority is shifted by one and becomes the asynchronous transmission buffer 214b-2, :3, 4.1, the slot in the asynchronous transmission buffer 214b-2 can be used for transmission. . At the next transmission opportunity, the transmission priority is set to asynchronous transmission buffers 214b-3, 4, 1.
, 2, but since there are no slots to transmit in buffers 214b-3 and 214b-4, the slot in 214b-1 is transmitted again. Thereafter, this procedure is repeated to transmit slots from the transmission buffer. There is no distinction between individual communication and broadcast communication in the processing of asynchronous information slots after the asynchronous transmission buffer 214b shown in FIG. The asynchronous transmission buffer 214b is
A transmission request signal is sent to the transmission determination block 211b. The transmission determination block 211b performs transmission determination according to the conditions shown in FIG. 7 based on the transmission request signal and the information in the header section, and after determining the four communication forms of transmission, release, release request, and relay, It is sent to the transmission path 300a. FIG. 7 shows an example of the transmission determination conditions of the transmission determination block 211b. Transmission is performed in case of item numbers #3 and #5. That is, (1) there is a transmission request from the asynchronous port 220, and the transmission path 300
The slot sent to the loop access block 210 is for asynchronous use (slot type bit S is “00”)
(2) For asynchronous use (slot type bit S is 11001+
) and in use (busy bit B is II I II ) and there is no transmission request from another node and release request bit R is I
I OII ) and spontaneous (source node address SAN
(matches the own node address). Note that the condition that there is a transmission request from the asynchronous port 220 includes the condition that the access level of the slot for which transmission is desired is higher than or equal to the access level of the slot sent from the transmission path. . In the case of "transmission", the transmission determination block 211b first sends a transmission permission signal to the asynchronous transmission buffer 214b. Next, for the asynchronous information slot sent from the asynchronous port 220, the busy bit B is set to 111 II,
After setting the release request bit R to 0'', it is sent to the transmission line 300. "Release" is performed in the case of item number 32 and #6. That is, (1) there is no slot transmission request from the asynchronous port 220 and the slot is for asynchronous use (slot type bit S is 00") and spontaneous; (2) there is a slot transmission request from the asynchronous port 220 and the transmission line 300 to loop access block 210
The slot sent to is for asynchronous (slot type bit S is “00”) and in use (busy bit B is N I
11) and there is a transmission request from another node (release request bit R is II l +1) or spontaneous (the source node address SAN matches the own node address). In the case of slot release, the transmission decision block 211b
In the transmission line 300, the loop access block 2
Set the usage status display in the header section to unused (busy bit B is "O") for the slot sent to slot 10,
Furthermore, the release request bit R is set to KL without the release request display.
OT+) and the destination node address DA.
After setting an address that is not assigned on the network to N (for example, all lO+''), the transmission line 30
Send to 0. The "release request" is performed after repeating the condition shown in item number #4 n times (n: a non-negative integer). That is, the release request is made after counting the number of times in which the release request can be made. Item number #
The condition shown in 4 is that there is a slot transmission request from the asynchronous port 220, and the slot sent from the transmission path 300 to the loop access block 210 is for asynchronous use (slot type bit S is "OO") and is in use ( Busy bit B = 1) and other source (source node address SA
(N does not match the own node address). In the case of a release request, the transmission determination block 211b sets the release request bit to R=1 for the slot sent from the transmission path 300 to the loop access block 210, and then sends it to the transmission path 300. . Note that the release request can also be controlled by the number of slots stored in the asynchronous transmission buffer 214. For example, when the number of slots stored in even one of the four asynchronous transmission buffers 214 reaches m (m: 1 to the maximum number that can be stored in the buffer), a release request is made. Here, a counter is provided that counts each time a release request is made and resets when a transmission is made. If the value of this counter exceeds a certain set value 1, for example (total number of nodes on the transmission path - 1) x (time required for a slot to go around the transmission path), it is regarded as an access abnormality. "Relay" is performed only in case #1. This is the case when there is no transmission request from the asynchronous port 220 and the slot sent from the transmission line 300 to the loop access block 210 is asynchronous (slot type bit 5=00) or originated from another source. In the case of relay, the transmission determination block 211b sends the slot sent to the loop access block 210 from the transmission path 3°O to the transmission path 300 as is. Transmission, release, release request, and relay of asynchronous information slots are performed as described above. Note that a return timer is also provided in the loop access block 210 to count and check the number of slots transmitted by the own node onto the transmission path 30o and the number of released slots transmitted by the own node onto the transmission path 300. . As a return timer, a counter is provided that counts up when a slot is transmitted with respect to a certain reference value and counts down when it is released. If it is within the maximum number range, it can be considered as a normal state. Alternatively, a return timer as shown in FIG. 8 is also conceivable. This return timer has a counter that counts up when a slot is transmitted and counts down when it is released, and a timer that is reset every time a slot with busy bit B=1 is transmitted. If the counter value does not reach zero when this timer value indicates the slot transmission line circulation time k, it is considered to be abnormal. Note that FIG. 8 shows a case where an abnormality is detected. "In the case of synchronization information slot" Figure 9 shows an example of synchronization port 22Of and port 22.
This shows bidirectional communication between 0g and 0g. For simplicity, we will explain the case where there is only one transmission path, but in the case of multiplexed transmission paths, the slot can be sent from a port to any transmission path in the same way as shown in the case of asynchronous information slots. Selective broadcast communication by destination port address DAP is possible. Note that if transmission paths are not changed and selective broadcast communication is not performed during transmission, there is no need to add or identify the destination port address DAP. Communication between the two ports 22Of and 220g is performed using a synchronization information slot previously allocated by the master node 100 exclusively for communication between the two ports. Information in the synchronization information slot is also exchanged between ports 22of and 220g that accommodate communication device 500. Note that the form of communication by the synchronization port (“transmission only,” “reception only,” or “both transmission and reception”) is determined by a notification from the control block 230. In this example, since the communication is bidirectional, the command to perform "both transmission and reception" for the synchronization ports 220f and 220g is sent to each control block 230.
f and 230g. For the synchronization information slot, if the synchronization port 220 is connected to the slave node 200, the synchronization information slot is always passed through this synchronization port 220. Furthermore, when the synchronization port 220 is not connected, the relay is performed with the same delay as when the synchronization port 220f is used. To achieve this, the transmission line 30
The synchronization slot sent from 0 to the loop access block 210f is branched into two directions. One is sent to the synchronization port 220f for reception, and the other is sent to the delay adjustment block 215f for relay. This delay adjustment block 215f transfers the synchronization information slot received from the transmission path 300 from the loop access block 210 to the communication device 50 for synchronization information.
This block has the same amount of delay as the amount of delay required to return to the loop access block 210 again via the synchronization port 220, which is an adapter that connects It was established. This delay adjustment block 215f allows
The slot divided into two directions is sent again to the transmission judgment block 21.
The timing of arrival at 1f coincides. In the case of the slave node 200 to which the synchronization port is connected, communication is performed as follows. In the reception determination block 212f, when the slot is for synchronization (slot type bit S is 10), the reception valid signal (0: reception determination is not performed at the port, 1: reception determination is performed at the port) is set to '1. '' and sends it to the synchronization port 220f along with the reception slot. In other cases, set the reception valid signal to II OPI and send it to the synchronization port 220f along with the slot.The synchronization port 220f receives Judgment block 212f
The receiver inputs the frame position of the slot only when the reception valid signal passed is 111 II. If this matches the position assigned by the control block 230f, that is, if it is confirmed that the synchronization slot is dedicated between 220f and 220g, the synchronization information is received. In this way, whether or not a synchronization information slot is addressed to the own port is determined based on the slot's position within the frame, so identification and addition of destination and source addresses are not performed for the synchronization slot. After the synchronization port 22Of extracts the received slot information, it inserts transmission information into that position and transfers it to the transmission determination block 211f in the loop access block 21Of. Transmission judgment block 21
1f receives the synchronization information slot that has passed through the delay adjustment block 215f and the synchronization information slot sent from the synchronization port 220f, but when the synchronization information slot is sent from the synchronization port 22Of, this synchronization information slot must be input. A mode slot is selected and transmitted onto the transmission line 300. The slave node 200h to which the synchronization port on the transmission path 300 is not connected always selects the synchronization slot that has passed through the relay route. In other words, the transmission determination block 211
At h, the synchronization slot via the delay adjustment block 215h is selected and sent to the transmission path 300. "In case of management information slot" FIG. 10 shows the case of communication in management information slot. The management information slot is used for communication between control blocks 230 within each node allocated by the master node 100. Again, for simplicity, we will explain the case where there is only one transmission line, but in the case of multiplexed transmission lines, the transmission line selection block 213 can be provided to Sending slot to any transmission path and destination port address DAP
selective broadcasting is possible. Note that, as in the case of the synchronization information slot, when transmission path switching and selective broadcast communication are not performed during transmission, addition and identification of the destination port address DAP are unnecessary. The slot that enters the loop access block 2101 in the slave node 2001 from the transmission path 300 is branched into one for relay and one for reception. Delay adjustment block 215 for relaying
1, it enters a transmission judgment block 2111, and for reception it enters a reception judgment block 2121. This delay adjustment block 2151 transmits the synchronization information slot received from the transmission path 300 from the loop access block 210 to the communication device 50 for synchronization information.
This block has the same amount of delay as the amount of delay required to return to the loop access block 210 again via the synchronization port 220, which is an adapter that connects It was established. The reception judgment block 2121 determines whether the slot is for management (slot type bit S is "01"), in use (busy bit B is "1"), and for individual communication (■/G is 1+).
0 It) and addressed to the own node (destination node address DA
N matches the own node address) and broadcast communication (Ilo is l (1? 1) and is addressed to the own group (destination node address DAN matches the own group address), the management information slot Receive buffer 21
61. The management information slot reception buffer 2161 notifies the control block 230i when the slot storage is completed. The control block 230i that received this notification signal,
A slot is read from the management information slot reception buffer 2161. Note that the own group address is an address commonly assigned to nodes divided into groups. Next, the operation when the management information slot is sent from the control block 230i to the loop access block 210i will be described. The control block 230j sends the fixed length slot set as follows to the management information slot transmission buffer 2171 in the loop access block 2101.
Send to. In the case of individual communication, Ilo is 0'', the destination node address DAN is the destination node address, and the destination port address DAP is the address indicating the transmission path to which the destination control block is connected. , the source node address SAN is assigned the source node address, and the source port address SAP is an address indicating the transmission path to which the source control block is connected.On the other hand, in broadcast communication In this case, set -I10 to it 1 u, and set the destination group address for the destination address DAN, the address for selective broadcast communication for the destination port address DAP, and the source The source node address is assigned to the node address SAN, and the address indicating the transmission path to which the source control block is connected is assigned to the source port address SAP and sent. The management information slot set is sent from the management information slot transmission buffer 2171 in the loop access block 2101 to the transmission judgment block 2111.
1, the slots are selected and reset according to the conditions shown in FIG. 11, and then sent to the transmission path 300. The transmission conditions for the management information slot are the same as the transmission conditions for the asynchronous slot shown in FIG. 7, except for the slot type. Therefore, in the same way as in the case of asynchronous slots,
In the case of No. 3 and #5, transmission is performed, and in the case of No. 1 No. 2 and #6, release is performed. Also, in the case of item number #4, a release request is made, and in the case of :O:1, a relay is performed. Although the embodiments of the high-speed LAN according to the present invention have been described above, the present invention is not limited to the above embodiments. In the embodiment described above, the reception determination of the asynchronous information slot is performed at the asynchronous port, but it may also be performed within the loop access block. This will be explained using FIG. 4. For the slots that enter the loop access block 210b in the slave node 200b from the transmission path 300a, one slot is used for relaying and is sent to the transmission judgment block 2 via the delay adjustment block 215b.
11b, and the other one enters reception determination block 212b for reception. In the reception judgment block 212b, the slot is for asynchronous (slot type bit S is '00')
and is in use (busy bit B is II I II), as well as individual communication (Ilo is “0”) and self-addressed (
When the destination node address DAN matches the own node address) and broadcast communication (Ilo is u I II
) and the address is self-addressed (the destination node address DAN matches the self-group address), the reception valid signal (0
: Do not receive the relevant slot on the port, 1: Receive the relevant slot on the port) to 11111, and then set the asynchronous port 2 along with the reception information slot.
20b. The asynchronous port 220b receives only slots for which the reception valid signal is 1".Also, in the above-mentioned embodiment, the reception judgment of the synchronous information slot was made within the synchronous port, but as with the asynchronous information slot, the loop access It is also possible to perform this within a block. This will be explained with reference to FIG. The other one is sent to the delay adjustment block 215f for relaying.The reception judgment block 212f determines that the slot is for synchronization (slot type bit S is "10") and that the slot position in the frame is If it matches the position assigned from control block 2!30f, the reception valid signal (O: does not receive a synchronization slot at the port, 1: receives a synchronization slot at the port) is sent to 11.
After setting it to 111, synchronization port 2 along with the slot
Send to 20f. The synchronization port (22Of) which received the slot whose reception valid signal is 11111 receives that synchronization slot. Furthermore, for the management information slot, in the embodiment described above, the management information slot reception buffer 216 and the management information slot transmission buffer 217 are connected to the loop access block 21.
Although these are installed in the control block 230, it is also possible to provide them in the control block 230. This will be explained with reference to FIG. From the transmission path 300 to the loop access block 210 in the slave node 20Oj. The management information slot entered in j is branched into one for relaying and one for receiving. The signal for relaying passes through the delay adjustment block 215J and then enters the transmission judgment block 211j, and the signal for reception enters the reception judgment block 212j. In the reception determination block 212J, if the slot is for management (slot type bit S is "01") and in use (busy bit B is '1'), a reception valid signal (0:
Set 11111 to 11111 for ``Do not make a reception judgment for the slot in the control block.
Send to 6j. In the control block 230j, if the slot in the management information slot reception buffer 216j is for individual communication (I10 is II OII) and addressed to the own node (destination node address DAN matches the own node address), and if the slot is for broadcast communication (Ilo is RI II ) and addressed to its own group (the destination node address DAN matches its own group address), this slot is received. Note that the own group address is an address commonly assigned to nodes divided into groups. Next, the operation when the management information slot is sent from the control block 230J to the loop access block 210j will be described. First, the control block 230j sets the management information slot as follows. In other words, in the case of individual communication, set Ilo to lO+1, set the destination node address for the destination node address DAN, and set the transmission path to which the destination control block is connected for the destination port address DAP. The source node address SAH is assigned the source node address, and the source port address SAP is assigned an address indicating the transmission path to which the source control block is connected. On the other hand, in the case of broadcast communication, set /G to "1", and set the destination group address to the destination node address DAN, and selective broadcast communication to the destination port address DAP. The source node address SAN is assigned the source node address, and the source port address SAP is assigned an address indicating the transmission path to which the source control block is connected. After setting the address etc like this. Control block 230j stores the slot in management information slot transmission buffer 217j. control block 23
0j makes a transmission request to loop access block 210j. When the loop access block 210j indicates transmission permission for this transmission request, the control block 230j transfers the slot from the transmission buffer 217J to the transmission determination block 211 in the loop access block 210j.
Send to j. In the transmission determination block 211j, the first
After selecting and resetting the slot according to the conditions shown in FIG. The configurations of other embodiments for asynchronous, synchronous, and management information slot communication have been described above. In other words, for asynchronous slot communication, slot reception is determined within an asynchronous port and slot reception is determined within a loop access block, and for synchronous information slot communication, slot reception is determined within a synchronous port. There are two cases: a case where a judgment is made and a case where a slot reception judgment is made within a loop access block. Regarding communication of management information slots, there are two cases: a case in which a transmission and reception buffer for management information slots is provided in a loop access block, and a case in which a transmission and reception buffer for management information slots is provided in a control block. When these are combined in the present invention, there are eight configurations shown in FIG. 13. For example, the first embodiment shown corresponds to the configuration of item number #1 in FIG. Effects of the Invention 1 According to the present invention, the following effects can be obtained. (1) By adopting access control that comprehensively handles asynchronous information, synchronous information, and management information using slots,
Management information can be transmitted efficiently. It is easy to detect errors on transmission paths or within nodes, and it is also possible to secure the necessary transmission band for management information, so it is possible to quickly recover from a system failure. Furthermore, since it is possible to change the slot bandwidth allocation, it is possible to easily deal with changes in the transmission bandwidth of asynchronous information, synchronous information, and management information. (2) The delay adjustment block provided in the loop access block makes it possible to keep the amount of delay within the node constant for each transmission path, thereby controlling the transmission of slots to multiple multiplexed transmission paths. Since this eliminates the need for a buffer memory such as a frame memory and a logic circuit to control it, it can be easily implemented using a circuit that operates at high speed. Furthermore, since the delay amount setting is variable, it is possible to easily respond to changes in the required delay amount within the synchronous port. (3) By selecting a transmission path using the destination port address DAP, there is no need to send transmission path selection information individually, and the transmission band can be used effectively. (4) By setting the structure of the transmission buffer for asynchronous slots as shown in FIG. 6, broadcast communication can be performed smoothly. (5) Since the priority of transmission is moved for each transmission in the transmission buffer for asynchronous slots, fairness of transmission rights can be ensured for each port. (6) When releasing an asynchronous and management information slot, set the header usage status display to unused (busy bit B to II O'') for the slot sent from the transmission path to the loop access block. Furthermore, by not only setting the release request bit R to it Oy+ without displaying a release request indication, but also setting an address that is not allocated on the network to the destination node address DAN, the same slot may be accidentally used. (7) By deciding to issue a release request after counting the number of times (n: non-negative integer) that a release request can be made, unnecessary release requests are reduced. The use efficiency of asynchronous slots is improved. (8) By providing a counter that counts each time a release request is made and resets it when a release request is made, it is easy to check whether there are nodes that do not accept the release request. (9) The return timer detects abnormalities that occur on the transmission path, such as when the busy bit of B=1 changes to B=O, when the own node address changes to another address, and when the own node address is stored. This makes it possible to detect abnormalities such as when a register that is currently in use changes to a different value.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of a high-speed LAN according to the present invention, FIG. 2 is a diagram explaining a slot format, a frame format, and a multiplexed transmission signal in an embodiment of a high-speed LAN according to the present invention Figure 3 shows 1 of the present invention.
FIG. 4 is a diagram showing the configuration of a loop access block in an embodiment, FIG. 4 is a diagram showing an asynchronous slot access method in an embodiment of a high-speed LAN according to the present invention, and FIG. 5 is an explanation of selective broadcast communication. 6 is a diagram showing the configuration of a transmission buffer, and FIG. 7 is an explanatory diagram of transmission conditions of an asynchronous slot in an embodiment of the present invention. FIG. 8 is a diagram explaining a return timer used in one embodiment of the present invention, and FIG. 9 is a diagram illustrating a return timer used in one embodiment of the present invention.
FIG. 10 is a diagram showing an access method of a synchronization slot in an embodiment of N, FIG. 10 is a diagram showing an access method of a management information slot in an embodiment of a high-speed LAN according to the present invention, and FIG. An explanatory diagram of slot transmission conditions, FIG. 12 is a diagram showing a management information slot access method in another embodiment, and FIG. 13 is a diagram showing a high-speed LAN according to the present invention.
It is a figure showing the composition of the combination of each constituent element in an example. Description of symbols 100...Master node, 200...Slave node 210...Loop access block, 211
...Transmission judgment block, 212...Reception judgment block. 213... Transmission path selection block, 214... Transmission buffer for asynchronous slot, 215... Delay adjustment block, 216... Reception buffer for management information slot 217... Transmission buffer for management information slot, 220
...Port, 230...Control block, 300
...Transmission line, 400... Branch line LAN, 500...
Communication device, 600...terminal. Representative Patent Attorney Susuki 1) Toshiyuki ((]) (C) Cliff 390a 210 300a Figure 3 Figure 4 (θ) (b) Figure 5 Figure 6 Figure 7 k Slot or e-ball, 3 each - is IyoTrononisakiTI
Figure 8"600 Figure 9 Figure 10 Figure 11 Figure 13

Claims (1)

[Claims] 1. High-speed ring LA consisting of a ring transmission line and a plurality of node devices interconnected by the ring transmission line.
In the N system, the node device has an access block that exchanges information slots with the transmission line, a port that is an adapter that connects the access block and the communication device, and management used for control between each node device. branching means having a control block for controlling transmission and reception of information, and branching means for branching the reception slot that has entered the node from the transmission line into relay and reception; A delay block that delays the synchronization slot by the same amount of delay as the delay required for the synchronization slot to return from the access block to the access block again via the synchronization port, which is an adapter that connects a communication device for synchronization information. A high-speed ring LAN with 2. The high-speed ring LAN according to claim 1, wherein the high-speed ring LAN comprises a circuit in which the delay amount of the delay block is variable depending on the required delay amount of the synchronization port to which it is connected. 3. In the high-speed ring LAN according to claim 1, the ring transmission line is composed of a plurality of temporally or spatially multiplexed transmission lines, and the asynchronous information slot is A high-speed ring LAN comprising transmission line selection means for determining which of the plurality of transmission lines the transmission should be sent to by identifying a destination port address within the ring. 4. In the high-speed ring LAN according to claim 3, when the asynchronous information slot is a slot set for broadcast communication, by identifying the destination port address,
A high-speed ring LAN comprising transmission line selection means for selecting one or more of the plurality of transmission lines and performing broadcast communication. 5. In the high-speed ring LAN according to claim 3, the access block stores an asynchronous slot sent from an asynchronous port, and has a structure divided into an area common to individual and broadcast communications and an area dedicated to broadcast communications. A high-speed ring LAN in which one asynchronous transmission buffer is provided for each of the plurality of transmission lines. 6. In the high-speed ring LAN according to claim 5, instead of the above structure divided into an area common to individual and broadcast communications and an area dedicated to broadcast communications, a structure having an area common to individual and broadcast communications. A high-speed ring LA in which an asynchronous transmission buffer is provided for each port of each of the plurality of transmission lines.
N. 7. The high-speed ring LAN according to claim 6, further comprising means for shifting the priority of transmission for each transmission in the transmission buffer of the asynchronous slot sent out from each port provided for each of the plurality of transmission lines. High speed ring LAN. 8. High-speed ring LAN according to any one of claims 1 to 7.
Inputs the transmission signal from the delay block and port into the access block, makes a transmission decision based on the transmission request signal and the information in the header, and performs four types of transmission, release, release request, and relay. A high-speed ring LAN having a transmission determination block within the access block that sends a slot to a transmission path after determining a communication form. 9. In a high-speed ring LAN system consisting of at least one ring transmission line, a master node device and a plurality of slave node devices interconnected by the ring transmission line, the master node device connects a header part to the transmission line. One or more fixed-length slots consisting of information parts are circulated, and bandwidth is allocated to asynchronous information, synchronous information, and management information slots, and the slave node device uses the asynchronous information, synchronous information, or management information slots. When checking the status display, transferring information to the receiving node using the slot whose usage status display shows unused, and changing the usage status display to "used", and re-receiving the slot used by the own node after going around the ring. , if there is no transfer request to another node,
A high-speed ring LAN characterized in that the slot is allowed to continue to be used, and if there is a transfer request to another node, the slot is released by displaying it as unused.
access control methods. 10. In the access control method for a high-speed ring LAN according to claim 9, an area representing transmission priority is provided in at least the header portion of the asynchronous information and management information slot, and the access level of the slot for which transmission is desired by the node device is
An access control method for a high-speed ring LAN that permits transmission when the access level is equal to or higher than the access level of the transmitted slot. 11. In the high-speed ring LAN access control method according to claim 9, in order to release the slot, the usage status display in the header part of the slot sent from the transmission path is set to unused, and a release request is further made. An access control method for a high-speed ring LAN in which a display is set to "no" and an address that is not assigned on the network is set as a destination node address, and then a sending node is released to be sent to a transmission path. 12. The high-speed ring LAN access control method according to claim 9, wherein the release request is made after counting the number of times the release request can be made. 13. In the access control method for a high-speed ring LAN according to claim 9, a counter is provided that counts every time a release request is made and is reset when a transmission is made, and when this count exceeds a certain time, access is controlled. High speed ring L to be considered abnormal
AN access control method. 14. In the access control method for a high-speed ring LAN according to claim 9, the number of slots transmitted by the own node on the transmission path and the number of slots released by the own node on the transmission path are counted, and the number of slots transmitted by the own node is counted. An access control method for a high-speed ring LAN in which access is assumed to be in a normal state when the difference between the number of slots transmitted on the transmission line and the number of slots released by the own node on the transmission line is within the number of slots that can exist on the transmission line.