JPH07123095A - Broadcast type route setting system - Google Patents

Abstract

PURPOSE:To provide a broadcast type route setting system which never disuses cells nor causes delay at low cost by preparing a branch processing part to a module storing a trunk circuit in order to perform the switching/branching connection of received cells among the switching nodes. CONSTITUTION:The branch processing parts 203-1-203-3 are included in the modules 202-1-202-3 storing trunk circuits respectively. Then a circuit 201 branches out directly into circuits 208 and 209 by the part 203-1 with no intervention of a copy module. Thus, the branch connection causes no delay and however the branching frequency is limited to a normal trunk switching level. When the branching frequency exceeding the limit level is needed, the output of the module 202-1 is connected to a trunk circuit storing module 205 via a routing switch 204 of its own. Then the output of the module 205 is returned by a return circuit 206 and branched out by a branch processing part 207 of the module 205.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast route setting system in a switching system using an ATM system.

[0002]

2. Description of the Related Art Conventionally, in the case of setting a broadcast type route in a switching system, a dedicated module for copying information is prepared in a switching node in the switching system, and once an incoming line is connected to this copy module. Then, the information branched by the copy module was connected to the outgoing line.

Also, in the switching system using the ATM system, similarly, a system is employed in which branch connection is performed via a module for copying a cell once.

FIG. 7 shows a module configuration for branch connection in a conventional switching system using the ATM system.

In FIG. 7, 101-1 to 101-n are trunk lines, 102-1 to 102-n are trunk line accommodating modules, 105-1 to 105-m are subscriber terminals, and 106-1 to 106-m. Is a subscriber terminal accommodating module.

In this configuration, the trunk line 101-
A cell that has passed through 1 and has arrived at the trunk line accommodation module 102-1 is switched by the self-routing switch 103 and is given an identifier to be output to a target terminal. Here, in the case of normal communication, the target output module is another trunk line accommodating module or subscriber terminal accommodating module, but in the case of branch connection, the target output module is set in the copy module 104. It The cells arriving at the copy module 104 are copied by the number specified in the copy module 104,
A destination identifier specified in advance is added. By this operation, the cells transferred from the input trunk line to the self-routing switch 103 are copied by the copy module 104.
Via the network to a plurality of lines or a plurality of subscriber terminals.

[0007]

However, in the broadcast type route setting method in the switching system using the conventional ATM method as described above, since the connection is made via the module for copying once, the information is There is a problem in that a delay occurs in transmission.

Further, in the system using the ATM system, since information cells are generated asynchronously, when such traffic concentrates on the copy module, cell discard or delay occurs at the input side of the copy module. There was a problem.

Further, even if cells are not discarded or delayed on the input side of the copy module, the copy module needs to have a capability of branching the concentrated cells at high speed, which increases the cost of the system. There was a problem.

Further, in a system using such a copy module, normally, branch path setting between exchange nodes and branch setting to a subscriber system are performed using the same copy module. In this case, The switching node, which mainly performs the branch connection between the switching nodes, has a copy capability that is not necessary so much, and thus there is a problem that the system becomes expensive.

Therefore, an object of the present invention is to provide a broadcast route setting system which can be constructed at a low cost and which does not cause a problem of cell discard or delay.

[0012]

In order to achieve the above object, the present invention relates to a broadcast type route setting system in a switching system using an ATM system for transmitting information using ATM cell information. A branch processing unit for branching the ATM cell information is provided in a trunk line accommodating module provided in a switching node for branching and connecting information and for accommodating a trunk line for transmitting the ATM cell information. A between the switching nodes
The feature is that the switching and connection of the TM cell information is performed.

[0013]

According to the present invention, a branch processing unit for branching a received cell is provided as a standard function in a module accommodating a trunk line to perform a switched branch connection of the received cell between switching nodes. According to such a configuration, it is not necessary to go through the copy module at the time of branch connection, and branch connection without delay can be performed.

Further, since traffic is not concentrated on one copy module, it is possible to construct a system in which cell delay or discard does not occur on the switch.

Further, since the branching processing unit provided in the trunk line module has a function of performing only a very small amount of branching that is normally assumed when branching connections are made between switching nodes, a significant increase in cost is caused. Does not occur.

Further, in a node requiring a large number of branches of a subscriber system, a copy module as in the conventional case is used,
Since the switching node that performs branch connection between switching nodes uses a small amount of branching function of the trunk line accommodation module, it is possible to deploy branching capacity according to the load of the branching, thus reducing the cost as a whole. be able to.

In addition, in the connection between switching nodes, even when branch connections exceeding the normally expected number of branches between nodes are performed, by preparing a line to be returned to the switch through the trunk line accommodation module, A node for inter-node connection can be configured without deploying a costly copy-only module.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a broadcast route setting system according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a switching node used in the broadcast type route setting system according to the present invention. In FIG. 1, when branch connection is performed between switching nodes (at the relay switching level). The configuration of the exchange node in the case of branching is described below).

In FIG. 1, 201, 208 and 209 are trunk lines, 202-1 to 202-3 are trunk line accommodating modules, and 203-1 to 203-3 are inside the trunk line accommodating modules 202-1 to 202-3. The branch processing units 204 and 204 are self-routing switches.

In this configuration, the branch processing unit 203-1
Each of 203 to 203-3 assumes a branch at the level of relay exchange, and has a structure in which only a very small number of branches are possible. In other words, the structure is such that the increase in cost due to the branching function provided in the trunk accommodation module is suppressed as much as possible.

Here, in the case of performing a normal branch connection, for example, when branching from the line 201 to the lines 208 and 209, the branch processing unit 203-1 in the trunk line accommodating module 202-1 directs the direct line 208, Branch to 209.

However, the number of branches of the branch processing unit 203-1 can only be branched at the normal relay exchange level, so in rare cases it may be necessary to exceed the limit. In order to cope with this situation, in the switching node shown in FIG. 1, the trunk line accommodation module 205 provided with the branch processing unit 207 is connected to the self-routing switch 204, and the return line 206 is returned to the trunk line accommodation module 205. It is configured by connecting.

As a result, when the number of branches exceeding the limit of the branch processing unit 203-1 in the trunk line accommodating module 202-1 needs to be performed, the output of the trunk line accommodating module 202-1 is self-routed. Switch 2
The trunk line accommodating module 205 is connected via 04, the output of the trunk line accommodating module 205 is returned to the return line 206 once, and branching is performed using the branching function of the branching processing unit 207 of the trunk line accommodating module 205. It is configured.

When it is desired to further increase the number of branches, the branch connection unit 2 of the trunk line accommodation module 205
Trunk line accommodation module 205 for branch 1
It can be realized by folding back to.

That is, with this configuration, it is possible to increase the number of branches by using the branch function of the branch connection section 207 of the trunk line accommodation module 205 again.

It is possible to branch as many times as necessary by repeating the above operation, but basically, the branching function of the trunk line accommodating module allows branching at the relay exchange level, and this function is to the last. When to use is a special case.

FIG. 2 shows another structure of the switching node adopted in the broadcast type route setting system according to the present invention. The switching node shown in FIG. 2 is a switching node for branching to a plurality of subscriber terminals. The configuration of the node is shown.

In FIG. 2, 301 is a trunk line accommodation module, 303 is a self-routing switch, 304
Is a copy module, 305-1 / 305-m is a subscriber terminal, and 306-1 to 306-m are subscriber terminal accommodating modules.

In this configuration, the switching node is basically a switching node accommodating subscribers, and here, relay switching between trunk lines is not performed. Therefore, a branch corresponding to the number of subscribers is required, and a dedicated copy module 304 is prepared. This copy module 3
Since 04 makes branch connection to a large number of subscriber terminals connected to the self-routing switch 304, its utilization rate has a value commensurate with its cost, and wasteful resources are not deployed.

FIG. 3 is a diagram showing a functional configuration of the trunk line accommodation module 402 corresponding to each of the trunk line accommodation modules 202-1 to 201-3 shown in FIG. The cell input from the trunk line 401 is received by the cell receiving unit 403, the information portion is transferred to the routing identifier assigning unit 405, and the header portion is transferred to the routing information searching unit 404. The routing information search unit 404 searches the routing information storage unit 408 for the corresponding routing information using the transferred header information as a key. Here, the routing information stored in the routing information storage unit 408 includes the number of pieces of information to be branched (copied) and the routing identifier. The control unit 409 stores the routing information in the routing information storage unit 408.

The routing information obtained by the routing information search unit 404 is transferred to the routing identifier assigning unit 405, and the routing identifier assigning unit 405 generates a plurality of cells corresponding to the number of information items to be copied included in the routing information. Then, the routing identifier included in the routing information is added to the head of the generated plurality of cells.

The cell to which the routing identifier is assigned by the routing identifier assigning unit 405 is transferred to the cell transmitting unit 406 and sent to the self-routing switch 407.

In this way, the cells input from the trunk line 401 are copied into cells for the number of branches and transferred to the branch destinations. Note that the specific configuration of the processing unit shown in FIG. 3 is configured using hardware logic, and the time required for searching for routing information and the like is configured to be as fast as possible. In addition, since the cost is low, the scale is minimized.

Therefore, from the viewpoint of hardware / cost, the number of branches is limited by the branch function of the trunk line accommodation module 402.
Basically, since it is assumed that this branching function is used for branching at the relay exchange level, it becomes possible to provide resources that meet the purpose.

FIG. 4 is a diagram showing how cells are actually branched using the trunk line accommodation module having the branching function described above. In FIG. 4, 501 and 5
05 and 507 are trunk lines, 502, 504 and 506
Is a trunk line accommodation module, and 503 is a self-routing switch. Here, the cell input from the trunk line 501 is the trunk line accommodation module 502.
In Fig. 2, a situation is shown in which the route is branched into two routes. Here, the branching of the cell in the trunk line accommodation module 502 is performed by the branching processing unit 508 provided in the trunk line accommodation module 502.

FIG. 5 is a diagram showing a state of setting when the number of branches exceeding the limit of the number of branches of the trunk line accommodating module is required when setting the broadcast type route. is there. In FIG. 5, 601 is a loopback line, 6
Reference numerals 03, 605, 607, 609 and 612 are trunk line accommodating modules, 613, 606, 608 and 610 are trunk lines, and 604 is a self-routing switch.

In FIG. 5, cells input from the trunk line 613 are designated as trunk lines 606, 608, 61.
The figure shows the setting of branching to 0. In this case, the number of branchable branches of the trunk line accommodating modules 602 and 612 is two.

That is, the cell input from the trunk line 613 is branched into two branch routes 611 and 614 in the trunk line accommodation module 612. Here, one branch route 611 is a target line. The trunk line 610 is connected, and the other branch route 614 is connected to the trunk line accommodation module 603. Here, the trunk line accommodation module 603 and the loopback line 601 are used as substitutes for the copy module when it becomes necessary to perform branching beyond the limit of the number of branches in the trunk line accommodation module 612. Self-routing switch 60 on trunk line accommodation module 603
The cell input from No. 4 is transferred to the output section of the trunk line accommodation module 603 in the direction of the self-routing switch 604 via the loopback line 601. Other functions of the trunk line accommodating module 603 have the same functions as other trunk line accommodating modules, for example, the trunk line accommodating module 612, and branching is performed as described above. Here, the branch destination is the trunk line 606,
It is specified in 608.

In this way, the cells input from the trunk line 613 result in the trunk lines 606, 60.
It branches to 8, 610 and is sent out.

Here, in this embodiment, a branch connection of a relay system is realized by a single trunk line accommodation module without using a special copy module.

FIG. 6 is a diagram showing a state in which the respective configurations of the relay level branch shown in FIG. 1 and the subscriber accommodation level branch shown in FIG. is there.

In FIG. 6, the cells input from the trunk line 701 are the trunk line accommodation module 70 first.
Although it is branched at 2, since it is a relay switching level branch here, for example, it is sufficient if several branches can be made. In particular, a branch processing unit 703 provided in the trunk line accommodation module 702 is used without using a copy dedicated module. Is used for branching.

The cells branched by the branch processing unit 703 of the trunk line accommodation module 702 are the switching nodes 704,
Trunk line accommodation modules 705, 707, trunk lines 706, 708, trunk line accommodation module 71
3 and 714 to the switching nodes 710 and 715.

By the way, these two exchange nodes 71
0 and 715 are subscriber terminal accommodation modules 711-1 to 7
11-n and 716-1 to 716-m via subscriber terminals 712-1 to 712-n and 717-1 to 717
-M is a node that accommodates each of them and performs the final branch of the broadcast type connection described in FIG.

Therefore, it is not only necessary to be able to make a branch of several branches like the relay exchange level, and it is necessary to be able to make a branch of several branches to several hundreds of branches. Therefore, the switching nodes 710 and 715 use the copy modules 718 and 709 as in the conventional method to make a large number of branch connections.

As described above, by applying different branching methods depending on the relay switching node and the subscriber accommodation node, it is possible to arrange resources without waste as a whole.

[0048]

As described above, according to the present invention, the module accommodating the trunk line is provided with the function of branching the reception cell as a standard function. Therefore, when the branch connection is performed, the data is temporarily passed through the copy module. It is possible to make a branch connection without the need for delay.

Further, since traffic is not concentrated on one copy module, it is possible to construct a system in which no cell delay or discard occurs on the switch.

Further, since the branching function provided in the trunk line module is a function for branching only a very small amount (the number expected when branching connections are normally made between nodes), the cost is greatly increased. The branching function can be provided without performing.

Particularly, a node requiring a large number of branches in the subscriber system uses the conventional copy module, and a node branching node uses a small amount of branching function of the trunk line accommodation module. Therefore, the branching capacity can be provided according to the branching load, and the cost can be reduced as a whole.

In addition, even in the case of branch connections exceeding the normally expected number of branches between nodes in the inter-node connection, since the line to be returned to the switch through the trunk line accommodation module is prepared, the cost is particularly high. Nodes for inter-node connectivity can be configured without deploying a high copy-only module.

[Brief description of drawings]

FIG. 1 shows an embodiment of a switching node employed in a broadcast route setting system according to the present invention, showing a configuration of a switching node when a branch connection is made between switching nodes (relay switching level). Block Diagram.

FIG. 2 shows another configuration of the switching node adopted in the broadcast type route setting system according to the present invention, in which the switching node is configured to branch to a plurality of subscriber terminals (subscriber accommodation level). FIG.

FIG. 3 is a block diagram showing a detailed configuration of a branch processing unit in the trunk line accommodation module shown in FIG.

FIG. 4 is a diagram for explaining a branch connection operation by a branch processing unit of the trunk line accommodation module of the present invention.

FIG. 5 is a diagram for explaining a branch connection operation when the number of branches of the branch processing unit of the trunk line accommodating module of the present invention is exceeded.

FIG. 6 is a diagram for explaining a branch connection operation in a network configured by applying the broadcast route setting method of the present invention.

FIG. 7 is a block diagram illustrating a branch connection method in a switching system using a conventional ATM system.

[Explanation of symbols]

101-1 to 101-n trunk line 102-1 to 102-n trunk line accommodation module 103 self-routing switch 104 copy module 105-1 to 105-m subscriber terminal 106-1 to 106-m subscriber terminal accommodation module 201 , 208, 209 Trunk line 202-1, 202-2, 202-3 Trunk line accommodating module 203-1, 203-2, 203-3 Branch processing unit 204 Self-routing switch 205 Trunk line accommodating module 206 Return line 207 Branch processing Part 301 Trunk line 302 Trunk line accommodation module 303 Self routing switch 304 Copy module 305-1 to 305-m Subscriber terminal 306-3 to 106-m Subscriber terminal accommodation module 401 Trunk line 4 02 Trunk line accommodation module 403 Cell reception unit 404 Routing information search unit 405 Routing identifier assignment unit 406 Cell transmission unit 407 Self-routing switch 408 Routing information storage unit 409 Control unit 501, 505, 507 Trunk line 502, 504, 506 Trunk line accommodation Module 503 Self-routing switch 508 Branch processing unit 601 Return line 602 Branch processing unit 603, 605, 607, 609, 614 Trunk line accommodation module 604 Self-routing switch 701, 706, 708 Trunk line 702, 705, 707, 713, 718 Trunk Line accommodation module 703 Branch processing unit 704 Switching node (relay switching level) 710, 715 Switching node (subscriber terminal accommodation level) 711- ~711-n subscriber terminal accommodation module 716-1~716-m subscriber terminal accommodation module 712-1~712-n subscriber terminals 717-1~717-m subscriber terminal 709,718 copy module

Claims (1)

[Claims] 1. A broadcast type route setting method in a switching system using an ATM method for transmitting information using ATM cell information, the ATM cell information being provided in a switching node for branching and connecting the ATM cell information. A trunk line accommodating module for accommodating a trunk line for transmitting the ATM cell information is provided with a branching processing unit for branching the ATM cell information, and the branching processing unit is used to switch and branch the ATM cell information between switching nodes. A broadcast-type route setting method characterized in that