JPH06318952A - Logic multiplexed data repeating installation - Google Patents

Abstract

PURPOSE:To effectively suppress the reduction of the data transfer speed accompanied with the increase of the number of repeating stages with respect to the logic multiplexed data repeating installation for routing of a logic multiplexed data unit. CONSTITUTION:A data unit reception processing part 12 which receives the data unit, where the identifier of a call peculiar to the line route to a transfer destination is included in the header part, from some trunk circuit 10-1, a routing rocessing part 14 which checks contents of the header part of the received data unit to select a trunk circuit 10 existing on the line route to the transfer destination of the data unit, and a data unit transmission processing part 16-1 which transmits the received data unit to the selected trunk circuit 10 without updating the identifier of the header part of the received data unit are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for routing logically multiplexed data units.

In a large-scale logically multiplexed communication network constructed by using a large number of devices of this type, each relay device receives a plurality of data units logically multiplexed on a line and performs a routing process for those data units. By doing so, all the data units are sequentially transmitted along the route toward the corresponding destination.

[0003]

2. Description of the Related Art In FIG. 5, a relay line 10_0 is branched into two lines by a logical multiplex data relay device 1_0, and both relay lines 10_1 and 10_2 are connected to another logical multiplex data relay device 1_1. , 1_2 is branched into a large number.

A plurality of data units 100 are logically multiplexed on the relay line 10_0, and these are received by the data unit reception processing unit 12 of the logically multiplexed data relay apparatus 1_0.

FIG. 6 shows the structure of the data unit 100. Each data unit 100 may include communication control information of the upper layer in addition to pure user data depending on the protocol layer. Certain), a header section (for storing communication control information), and the header section includes a call identifier (used for identifying a logically multiplexed communication call on the trunk line 10_0).

Then, the data unit 100 received by the data unit reception processing section 12 is delivered to the routing processing section 14, and the routing processing section 14 receives the data unit 100.
The header part of is checked (FIG. 7_step 700).

As a result, the final transfer destination of the data unit 100 (via the other logical multiplex data relay device 1_1 in FIG. 5) is confirmed, and the relay line 10_1 existing on the line route to the transfer destination is selected. (FIG. 7_step 702).

Further, the header section (identifier) of the same data unit 100 is edited by the header editing processing section 18-1 in accordance with the trunk line 10_1 (FIG. 7_step 704: when the trunk line 10_2 is selected, Same data unit 1
The header part of 00 is edited by the header edit processing part 18-2 according to the trunk line 10_2).

That is, since the identifiers on the relay line are arbitrarily set independently for each line (this is not particularly regulated), the identifier included in the header part of the data unit is received. It is updated at each relay stage from the one on the relay line which became the side to the one on the relay line which became the transmitting side.

FIG. 8 illustrates a conventional identifier editing operation in the case of a switch (logical multiplex data relay device) of the frame relay system. In FIG. 8, the data link channel identifier DLCI is on the relay line 10_0. "Aaa" is updated to "bbb" on the trunk line 10_1, and further, "bbb" on the trunk line 10_1 is updated to "ccc" on the trunk line 10_i.

When the identifier is edited in this way, in FIG. 5, the data unit 100 is the selected trunk line 1
0_1 is sent from the corresponding data unit sending processor 16-1 (step 706 in FIG. 7), and finally received at the transfer destination.

When the trunk line 10_2 is selected, the header portion of the data unit 100 is the trunk line 10_2.
The data is edited by the header edit processing unit 18-2 in accordance with the above, and then sent out to the transfer destination from the corresponding data unit sending processing unit 16-2 (step 706 in FIG. 7).

[0013]

In the prior art, since the identifier is edited at each relay stage (logical multiplex data relay device), the data transfer rate decreases as the number of stages for relaying data transfer increases. To do.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide a logical multiplex data relay apparatus capable of effectively suppressing a decrease in data transfer rate due to an increase in the number of relay stages. To provide.

[0015]

In order to achieve the above object, a logical multiplex data relay apparatus according to the present invention is configured as shown in FIG. 1, and in the figure, a line route (line network) to a transfer destination is shown. Data unit reception processing for receiving a data unit in which a header of a unique call (or a group of calls having the same transfer destination) unique in all or part of the same is received from one of the relay lines 10_0. Part 12 and
A routing for checking the content of the header part in the received data unit and selecting the relay line 10_1 existing on the line path to the transfer destination of the data unit (single user, group having a plurality of users as members, etc.) Processing unit 14
And a data unit sending processing unit 16-1 for sending the received data unit to the selected relay line 10 without updating the header section identifier in the received data unit.
And have.

[0016]

In the present invention, the call identifier contained in the header of the data unit is unique over the line route to the transfer destination of the data unit. Therefore, when the data unit is received, the identifier of the header unit is received. The received data unit is sent as it is to the line path on the transfer destination side without editing.

The operation of the present invention is illustrated in FIG.
A plurality of communication devices (logical multiple data relay device 1) are connected by a line link (relay line 10) and exist on a line path of a data unit (100) to a transfer destination, and all the communication devices perform the relay respectively. The call identifier editing process is omitted.

Therefore, the identifier (a) of each data unit (100) is common to each line link (10), and the format of the data unit received by each communication device (1) and the format of the data unit transmitted by them. Is the same as.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a logical multiplex data relay apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a logical multiplex data relay device (switch) of the frame relay system, in which DLCI (data link channel identifier) is used as a call identifier in the line.

However, the data link channel identifier (DLCI) is unique to each transfer destination of the data unit 100 (frame), and is therefore unified on all the trunk lines 10 ( It may be unified on some relay lines 10).

Further, each logical multiplex data relay device 1_0,
1_1, 1_2 ... Represents the header edit processing unit 18 of FIG.
-1, 18-2 are not provided, and are configured by only the data unit reception processing unit 12, the routing processing unit 14, and the data unit transmission processing units 16-1, 16-2.

It should be noted that these logical multiplex data relay devices 1
_0, 1_1, 1_2 ... Have the same configuration, and the routing processing unit 14 sets the data unit transmission processing unit 1
6-1 and 16-2.

In FIG. 3, each logical multiplex data relay device 1_
Since the processing procedure of 0, 1_1, 1_2 ... Is described and the header edit processing unit 18 is not provided for them, the processing of editing the data link channel identifier (DLCI) (FIG. 7_step 704) is omitted. To be done.

Therefore, upon reception of the frame, the routing process (FIG. 3_steps 700 and 702) is followed immediately by the frame sending process (FIG. 3_steps 706).

The operation of this embodiment is described with reference to FIG. 4, and since the processing for editing the data link channel identifier (DLCI) is omitted in each node A, B, C, each node A, B, The formats of the frame received by C and the frame transmitted by them are the same.

As described above, according to this embodiment, the process of editing the identifier in the header is omitted. Therefore, the processing load on each node is reduced, and the time required for frame communication is shortened.

Therefore, the number of frame processings per unit time in each relay stage is increased, so that the processings are performed more quickly, and as a result, the capacity of the system is enhanced.

[0029]

As described above, according to the present invention, the identifier editing process is omitted to reduce the processing load, thereby shortening the communication time of each device (relay stage) and increasing the processing speed thereof. It is possible to increase the communication capability of the system.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of an embodiment.

FIG. 2 is an explanatory view of the operation of the invention.

FIG. 3 is a flowchart illustrating a processing procedure of an embodiment.

FIG. 4 is an explanatory view of the operation of the embodiment.

FIG. 5 is an explanatory diagram of a configuration of a conventional example.

FIG. 6 is an explanatory diagram of a configuration of a data unit.

FIG. 7 is a flowchart illustrating a processing procedure of a conventional example.

FIG. 8 is a diagram for explaining the operation of the conventional example.

[Explanation of symbols]

 1_0, 1_1, 1_2 Logical multiplex data relay device 10_0, 10_1, 10_2 Relay line 12 Data unit reception processing unit 14 Routing processing unit 16-1, 16-2 Data unit transmission processing unit 18-1, 18-2 Header editing processing unit 100 data units (frame)

Claims (1)

[Claims] 1. A data unit reception processing unit (12) for receiving a data unit, in which a unique call identifier is included in a header portion, from one of the relay lines (10_0) over a line route to a transfer destination, A routing processing unit (14) for checking the contents of the header unit in the data unit and selecting the relay line (10_1) existing on the line route to the transfer destination of the data unit
And a data unit sending processing unit (16-1) for sending the received data unit to the selected relay line (10_1) without updating the identifier of the header unit in the received data unit. A logical multiplex data relay device characterized by the above.