JPH05260060A - Communication equipment - Google Patents

Abstract

PURPOSE:To prevent transmitting signals from being inverted and to enable high-speed communication by providing a function to judge a reading order at a reception switch. CONSTITUTION:A dividing means 8 divides a transmitting node into transmitting signals at equal intervals. The divided transmitting signals are added with serial order numbers or the like being a continuous number by the dividing means 8. These signals are temporarily stored in a transmission buffer 9. A transmission switch 10 for the transmitting node successively judges whether rings are empty or not and when the rings are empty, the divided transmitting signals are successively transmitted one by one. On the other hand, at a receiving node, only the transmitting signals addresses to the node itself are stored among the received transmitting signals in reception individual buffers 14-16 by respective medium access control means 11-13. The queue of the respective reception individual buffers 14-16 is read out to a common reception buffer 18 by a reception switch 17. This reception switch 17 reads the order numbers of the transmitting signals divided in that case, judges whether the order is correct or not, and reads those signals only when the order is correct.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device which is used in a multi-link group network in which networks are multiplexed and which divides a transmission signal for communication.

[0002]

2. Description of the Related Art In recent years, in HDTV transmission, high-speed LAN connection, image transfer for medical use, etc., there is an increasing demand for communication exceeding G (giga) bps. With the use of transmission media such as optical fibers, the progress of transmission technology has enabled transmission over Gbps on the transmission path. On the other hand, since the communication speed of a single communication device is limited, network multiplexing is performed as a method of overcoming this.

The multi-ring network is a method in which a plurality of low-speed ring networks are provided, and these are regarded as one high-speed channel, that is, a virtual channel to increase the speed. In this method, it is necessary to evenly distribute the traffic of each ring to each ring at the time of call connection. I mean,
This is because if the traffic is unevenly distributed between the rings, the total throughput of all the rings is reduced. In the ring LAN, the transmission node divides the transmission signal into equal intervals by time division, and transmits the transmission signal divided into the fastest vacant ring. The receiving nodes are operated in parallel to increase the speed.

FIG. 7a shows an example of the configuration of a multi-ring network according to the above conventional technique. Reference numerals 51 and 57 are transmission paths which are communication paths with the outside, 52 is a transmission node that divides the transmission signal and transmits the transmission signal divided into the fastest vacant ring, 53 to 55 are ring networks, and 56 is a receiving node. is there. Other communication devices are omitted. FIG. 7 b is a block diagram of the receiving node 56.

Reference numerals 53 to 55 are individual ring networks forming a multi-ring network, 58 to 60 are medium access control devices (hereinafter abbreviated as MAC) for selecting a transmission signal addressed to its own node from each ring, and 61 to 63 are MAC5.
An individual reception buffer that temporarily holds the transmission signals from 8 to 60, a reception switch 64 that sequentially extracts the transmission signals from the individual reception buffers 61 to 63, and a reference numeral 65 that reproduces the transmission signals extracted by the reception switch as the original transmission signals. It is a reception common buffer that is held as much as possible.

FIG. 8 is a diagram showing how a transmission signal is divided at a transmission node. The upper part of the figure is one transmission signal before being divided. The lower side is a transmission signal divided into seven equal parts, to which address information is added. The operation of the multi-ring network configured as above will be described.

The transmitting node 52 divides the transmission signal into equal intervals by time division. FIG. 8 shows how this transmission signal is divided. This divided transmission signal 601-607
Are transmitted in order from the earliest free ring. In the reception node 56, the transmission signals arriving from each ring network are filtered by the corresponding MACs 48 to 50 only for the transmission signals addressed to the own node, and are stored in the corresponding reception individual buffers 61 to 63. At this time, a queue is generated in the reception individual buffers 61 to 63 as shown in FIG. Regarding the speed of the transmission signals 601-607, the speed of arrival at the transmission node → reception individual buffer is the reception individual buffer →
This is because it is faster than the transfer rate to the reception common buffer 65. The divided transmission signals stored in the respective reception individual buffers 61 to 63 are sequentially read out one by one from the respective reception individual buffers 61 to 63 by the reception switch 54, and are received in the reception common buffer 65 as shown in the figure. Stored in and reconstructed into the original transmitted signal.

If all of the rings are empty at the time of transmission on the transmitting node side, since the transmitting node transmits from the empty ring, the transmission signals 601 to 607 are transmitted.
Will be stored in each of the reception individual buffers 61 to 63 as shown in FIG. 9a. Each reception individual buffer 61 to 6
The queue of 3 is further stored in the reception common buffer 65 by the reception switch 64 as shown in FIG. 9a and is correctly reconstructed into the original transmission signal.

[0009]

However, according to the above-mentioned prior art, there is a problem that the order of the transmission signals is reversed due to the following reasons, and there is a problem that the transmission signals are not reproduced correctly. As a result, if the transmission signal is, for example, a sound signal, a part of the sound is broken, and if it is an image signal, a part of the image is corrupted.

The reason for this is that when transmitting on the transmitting node side, the load on each ring is usually not constant and the non-empty ring is skipped, so that, for example, the transmission signals 601 to 607 are transmitted to the individual reception buffers 61 to 63 in FIG. 9b. This is because it may be stored as shown. That is, since the ring 3 is initially vacant, the transmitting node 2 transmits the transmission signal 601.
Was transmitted to the ring 3, and then the transmission signal 602 was tried to be transmitted to the ring 4, but since the ring 4 was used and was not vacant, the reception switch 14 was switched and the next ring 5
This is a case where the transmission signal 602 is transmitted because the transmission signal 602 is empty. At this time, the transmission signals 601 to 607 are sent out in the divided order, and 601 → 602 → 603 → 604 →
Reception individual buffer 61 in the order of 605 → 606 → 607
Arrives at ~ 63 and becomes the queue of Figure 9b. This queue is provided by the receiving switch 64 by the receiving individual buffer 6
As a result of being repeatedly read in the order of 1 → 62 → 63 and stored in the reception common buffer 65, in the reception common buffer 65, a part of the transmission signal to be reproduced is reversed as shown in FIG. 9B.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a communication device capable of preventing the order of transmission signals from being reversed in a multi-ring network.

[0012]

In order to solve the above-mentioned problems, the present invention is a communication device for use in a multi-ring network composed of a plurality of ring networks, which divides a transmission signal to transmit and receive. Divides the transmission signal into equal parts, and sets the source and destination address information for each divided transmission signal, the sequence number that is a consecutive number from the beginning of the divided transmission signal, and the end of the sequence number. The division means for adding the final information shown, the transmission buffer for temporarily storing the transmission signal input from the division means, the ring networks are sequentially connected to search for an empty space, and the empty ring network is searched for. A transmission switch that sequentially transmits the divided transmission signals from the transmission buffer from the beginning, and the reception unit is connected to each ring network, Media access control means for identifying the address information of the divided transmission signals inputted from the network and fetching only the divided transmission signals addressed to the own station, and connected to each medium access control means, and inputted from there A reception individual buffer that holds the transmission signal to be output at 1 o'clock and outputs it in the order in which the transmission signal is held; a reception switch that connects the reception individual buffers in order and extracts the transmission signal divided according to the sequence number of the division transmission signal; The reception common buffer that sequentially arranges the divided transmission signals input from the reception switch, and the division transmission signals that are arranged in the reception common buffer up to the final number, removes the information added at the time of division. And a reproducing means for reproducing the transmission signal. A communication device characterized by the above.

[0013]

According to the present invention, by the above means, the dividing means of the transmitting node divides into transmission signals at equal intervals. The divided transmission signal is further added with a sequence number or the like, which is a continuous number, by the dividing means. This signal is temporarily stored in the transmission buffer. The transmission switch of the transmission node 2 determines whether or not the ring is vacant in order, and if the ring is vacant, sequentially transmits the divided transmission signals one by one.

On the other hand, regarding the transmission signal arriving at the receiving node, only the transmission signal addressed to the own node is stored in the reception individual buffer by each medium access control means. The queue of each reception individual buffer is read into the reception common buffer by the reception switch. The receiving switch 14 reads the sequence number of the divided transmission signal at that time to determine whether the sequence is correct, and reads only when the sequence is correct.

With this configuration, it is possible to prevent the order of the transmission signals from being reversed regardless of the length of the queue of each reception individual buffer.

[0016]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a configuration in a loop network according to the present invention. In FIG. 1, other communication devices on the multi-ring network are omitted. 1, 7
Is a transmission line, which is connected to communicate with the outside, and is, for example, a public line or an ISDN network.

Reference numeral 2 denotes a transmission node, which corresponds to the transmission unit of the communication device of the present invention. Ring networks 3 to 5 are each a multi-ring network.
Reference numeral 6 denotes a receiving node, which corresponds to the receiving unit of the communication device of the present invention. 2A and 2B are diagrams showing details of the transmission node unit and the reception node unit in the present invention.

Reference numeral 8 denotes a dividing means, which divides the transmission signal into equal parts, and for each divided transmission signal, the source and destination address information and the sequence number which is a consecutive number from the beginning of the divided transmission signal. And final information indicating the end of the sequence number are added. Reference numeral 9 is a transmission buffer, which temporarily stores the transmission signal input from the dividing means 8. Reference numeral 10 denotes a transmission switch, which sequentially connects the ring networks to search for an empty space, and sequentially transmits the divided transmission signals from the transmission buffer to the empty ring network from the beginning.

Reference numerals 11 to 13 denote medium access control devices (hereinafter referred to as MACs) which select a transmission signal addressed to the own node from each ring. 14-16 are reception individual buffers, and MAC 11-
The transmission signal from 13 is temporarily held. Reference numeral 17 denotes a reception switch, which connects the reception individual buffers 14 to 16 in order, determines at this time whether or not the sequence numbers of the transmission signals are in the readout number sequence, and if they are in sequence, reads out the transmission signals. Connect to the next receive individual buffer, otherwise connect to the next receive individual buffer without reading.

Reference numeral 18 denotes a reception common buffer, which temporarily holds the transmission signal extracted by the reception switch. The operation of the transmitting unit and the receiving unit configured as described above will be described using the flows shown in FIGS. The transmission signal flowing through the transmission line 1 in FIG. 1 is divided at equal intervals by the dividing means 8 of the transmission node 2 (step 1 in FIG. 5). FIG. 3 shows how the transmission signal is divided by the dividing means 8.
The transmission signal before division on the upper side of FIG.
Of the last transmitted signal 10 at this time.
Since the transmission signal lengths of 7 may not match, the transmission node performs padding to make transmission signals at equal intervals. After that, the divided transmission signal is subjected to address information (M in the figure) composed of a source address and a destination address by the dividing means.
(AC address), a sequence number that is a continuous number from the beginning of the divided transmission signal, and end information indicating the end of the sequence number are added (step 2). As the end information, here, 1 bit in the sequence number is assigned and only the end is 1
And

The divided transmission signal is transmitted by the transmission buffer 9.
When stored in the ring switch 3,
It is determined whether or not there is an empty space (step 3). At this time, the transmission switch 10 proceeds to step 6 if it is not vacant, and transmits one head of the divided transmission signal from the transmission buffer 9 if it is vacant (step 4) and determines whether or not the signal is the tail. Is determined (step 5), the process proceeds to step 6 if it is not the end, and the transmission is ended if it is the end. Next, the ring 4 is processed in the same manner (steps 6 to 8), and the ring 5 is processed in the same manner (steps 9 to 1).
The process is performed in 1) and is repeated until the last transmission signal is transmitted.

On the other hand, on the receiving side, the transmitted transmission signal 101 arrives.
To 107 are filtered by the MACs 11 to 13 based on the address information, and only the transmission signal addressed to the own node is stored in the reception individual buffers 14 to 16. At this time, the arrival speeds of the divided transmission signals 101 to 107 are higher in the speed between the transmission node 2 and the reception individual buffers 14 to 16 than in the reception individual buffers 14 to 16 and the reception common buffer 15. , Reception individual buffer 11
There will be a queue at ~ 13.

At the time of transmission of the transmitting node 2, if each ring is empty, the receiving individual buffers 14 to 16 are shown in FIG.
Will be received as. However, on a normal ring, the load on each ring is not constant and each ring is not necessarily free, so that each reception individual buffer 14-1
6 may be stored in the order shown in FIG. 4b. In the state of FIG. 4b, the transmitting node 2 first tries to send the transmission signal 101 to the ring 3 because the ring 3 is empty first, and then tries to send the transmission signal 102 to the ring 4, but the ring 4 is used. In this case, the transmission switch 10 is switched because there is no free space, and the transmission signal 102 is transmitted because there is a free space in the next ring 5.

In the receiving node 6, the queue shown in FIG.
5 is read. This receiving switch 17 is the same as the prior art in that the receiving individual buffers 11 → 12 → 13 are switched to access in order, but at that time, the sequence numbers of the divided transmission signals are read to determine whether the sequence is correct. The points are different. FIG. 6 shows a flow showing the read operation of the receiving switch 17.

In the case of the queue of FIG. 4b, the receiving switch 17 first sets the read number N, which represents the leading value of the sequence number of the transmission signal to be read, to 101 here (step 21). Next, the reception switch 17 is connected to the reception individual buffer 14 to read the sequence number from the leading transmission signal (step 22), and judges whether or not it matches the readout number N = 101 (step 23). If not, the process proceeds to step 28, and if they match, the transmission signal is read. Since they match here, the reception switch 17 determines that the transmission signal 1
01 is read out and stored in the reception common buffer 18 (step 24), the tail information in the sequence number is taken out (step 25), and it is judged whether or not it is the last transmission signal (step 26). The read number N is set to the next read number N = 102 (step 27).

Thereafter, the reception switch 17 is connected to the reception individual buffer 15 and reads out the sequence number from the leading transmission signal (step 28), and judges whether or not it coincides with the readout number N = 102 (step 29). ), If they do not match, the process proceeds to step 34, and if they match, the transmission signal is read. Since they do not match here, the process proceeds to step 34. Further, the reception switch 17 is connected to the reception individual buffer 16 and reads out the sequence number from the leading transmission signal (step 34), judges whether or not it coincides with the readout number N = 102 (step 35), and coincides. If not, the process proceeds to step 22, and if they match, the transmission signal is read. Since they match here, the reception switch 17 reads the transmission signal 102 and stores it in the reception common buffer 18 (step 36),
Further, the tail information in the sequence number is taken out (step 37) and it is judged whether or not it is the tail transmission signal (step 3).
8) Since it is not the end here, the read number N is set to the next read number N = 103 (step 34) and the process returns to step 22.

After that, the reception switch 17 repeats the above operation until the transmission signal 107 is stored in the reception common buffer 18 and the tail information is detected. As a result, the divided transmission signals are stored in the reception common buffer 18 in the correct order as shown in FIG. 4B, and the original transmission signals are correctly reproduced. In this embodiment, one reception common buffer 18 is described for simplification, but actually, the reception switch 17 has a plurality of reception common buffers according to the transmission source, and the reception switch 17 determines the transmission source address. It also has the function of sorting. The operation in that case is different in the following point in the flow of FIG. That is, step 2 of FIG.
1, the read number is plural such as N1, N2, N3 ..., and the determination of the address of the transmission source is added in steps 23, 29 and 35, and steps 24 and 3
In 0 and 36, a determination is added to the reception common buffer corresponding to the address of the transmission source, Step 2
That is, a plurality of determinations at the end are required in 6, 32, and 38.

The number of multi-rings shown in FIG. 1 is three.
Similar results are obtained not only for books but also for multiple rings.

[0029]

As described above, according to the present invention, since the receiving switch is provided with the function of determining the reading order, when the transmission signal is stored from the reception individual buffer to the reception common buffer, the transmission signal is stored. There is an effect that the order of is prevented from being reversed, and there is an effect that the transmission signal is always reproduced correctly. As a result, if the transmission signal is, for example, a sound signal, a part of the sound is not broken, and if it is an image signal, a part of the image is not corrupted.

[Brief description of drawings]

FIG. 1 is an overview of a multi-ring network according to a first embodiment of the present invention.

2A is a detailed view of a transmitting node side of the multi-ring network in the same embodiment. FIG. 2B is a detailed view of a receiving node side of the multi-ring network in the embodiment.

FIG. 3 shows how the transmission node side divides a transmission signal in the embodiment.

4a is a state in which a load on the multi-ring network in the embodiment is small and a storage state is stored in a buffer on the receiving node side when transmission signals are sequentially transmitted. B The load on the multi-ring network in the embodiment is distributed, State when the transmitted signal is stored in the empty ring

FIG. 5 is a flowchart showing the operation of the transmitting node in the embodiment.

FIG. 6 is a flowchart showing the operation of the receiving node in the embodiment.

FIG. 7 a Overview of multi-ring network in prior art b Detailed view of receiving node side of multi-ring network in prior art

FIG. 8 shows how a transmission node side divides a transmission signal in the prior art.

FIG. 9: Storage state in a buffer on the receiving node side when the load of the multi-ring network in the related art is small and transmission signals are sequentially transmitted b The load of the multi-ring network in the related art is dispersed and the transmission signal State when is stored in an empty ring

[Explanation of symbols]

 1, 7 External transmission path 2 Sending node 3-5 Multi-ring 6 Receiving node 8 Dividing means 9 Sending buffer 10 Sending switch 11-13 Medium access control unit of each ring 14-16 Receiving individual buffer 17 Receiving switch 18 Receiving Common buffer 101 to 107 Transmission signal divided

Claims (1)

[Claims] 1. A communication device for use in a multi-ring network composed of a plurality of ring networks, wherein a transmission signal is divided and transmitted and received, wherein a transmission unit divides the transmission signal and divides each divided transmission signal. With respect to the source and destination address information, a division means for adding a sequence number that is a serial number from the beginning of the divided transmission signal, and end information indicating the end of the sequence number, from the division means A transmission buffer that temporarily stores an input transmission signal and the ring networks are sequentially connected to search for an empty space, and the divided transmission signals from the transmission buffer are sequentially transmitted to the empty ring network from the beginning. And a receiving unit, wherein the receiving unit is connected to each of the ring networks, and the divided transmission is input from the ring network. And a medium access control means for identifying only the divided transmission signal addressed to the own station and each medium access control means connected and holding the transmission signal input from the medium access control means at 1 o'clock, A reception individual buffer that outputs in the order in which it is held, a reception switch that connects the reception individual buffers in order, and extracts a transmission signal divided according to the sequence number of the divided transmission signal, and a division input that is input from the reception switch. A reception common buffer for arranging the transmission signals in order; and a reproduction means for reproducing the original transmission signal by removing the information added at the time of division for the division transmission signals arranged up to the final number in the reception common buffer. A communication device characterized by the above.