KR20000007732A - Multi-casting connecting restore device and method at doubled switchboard of asynchronous transfer mode multimedia switching system - Google Patents

Abstract

PURPOSE: A device and a method are provided to restore the existing multi-casting connection data to the switching board when the switching board should be replaced because a trouble is generated in the doubled switching board while operating the ATM-MSS system. CONSTITUTION: The device and the method are composed of: a system management unit for managing the system; a node control unit(20) for connecting the whole node of the system and managing troubles and structures, connected with the system management unit; switch units(40a,40b) for switching an ATM cell, connected with the node control unit and consisted of plural switch boards; a clock supplying unit for supplying the clock to the switch unit; a subscriber unit which is connected to the node control and the switch unit and consisted of plural subscriber boards.

Description

Apparatus and method for restoring multicasting connection in a redundant switch board of asynchronous transfer mode multimedia switching system

The present invention relates to a multicasting connection recovery apparatus and method in a redundant switch board of an Asynchronous Transfer Mode Multimedia Switching System (hereinafter referred to as ATM-MSS). In particular, if a multicasting connection is established in an ATM-MSS system and a redundant switch board fails during operation, and the switch board needs to be replaced, the existing boards are restored to the replaced board. The present invention relates to an apparatus and a method for recovering the same multicasting connection information to two boards for normal service when a board fails simultaneously and is replaced or reset.

In general, the conventional configuration of ATM-MSS, which is a kind of ATM exchanger, is as follows and will be described with reference to FIG.

The ATM-MSS according to the prior art operates an element management system (EMS) 10 for managing a system on a workstation.

Inside the ATM-MSS system, a system manager 10 for managing the system, a node controller 20 for controlling nodes of the system, switch units 40a and 40b for switching ATM cells, and a clock supply unit for supplying a clock to the switch unit 30, the subscriber board unit 50a, 50b, 50c connected to the subscriber.

The element management system 10, the node control board 20, and the subscriber boards 50a, 50b, and 50c are respectively configured by Configuration Management (CM), Connection Management (CNM), and Fault Management (Fault Management). : FM) Software module.

The element management system 10 and the modules in each board unit can be interfaced by modules, and between the element management system 10, the node control unit 20, the node control unit 20, and the subscriber boards 50a, 50b, and 50c. Each module can interface with each other.

The switch board has a multicasting connection information storage memory that stores information necessary for the multicasting connection.

In the prior art, to perform a multicasting connection service in an ATM-MSS, it operates as follows.

First, when the connection management module of the element management system requests a one-way connection from one source subscriber to multiple destination subscribers, the connection management module of the node control board receives this message.

The connection management module of the node control board receiving the message transmits the multicasting group number to the internal multicasting virtual path (VP) / virtual channel (VC) and the multicasting information memory required for the multicasting connection. By assigning, it requires the connection to originating and multiple incoming subscribers.

The multicasting information memory of the switch board indicates the switch of the called subscriber board to which the cell is to be copied to the called subscriber board using the multicasting number.

When the connection-related operation as described above is performed, the same information may be transmitted from the originating subscriber to the corresponding recipients.

When one of the switch boards is mounted after mounting while the system is in normal service, the connection management module of the node control board reads the contents of the multicasting information storage memory of the normally operated switch board and the multicasting information of the newly mounted switch. Must be stored in storage memory.

In addition, when both redundant switch boards are unmounted / mounted, there is a problem in that the multicasting connection is released from the element management system to release the multicasting connection of the subscriber and then reconfigure.

Therefore, the present invention was devised to solve the problems as described above, when a multicasting connection is established in the ATM-MSS system, if a redundant switch board fails during operation and the switch board needs to be replaced, the replaced board It is an object of the present invention to provide an apparatus and method for recovering a multicasting connection in a redundant switch board of an asynchronous transmission mode multimedia switching system for recovering existing multicasting connection information.

Another object of the present invention is to establish a multicasting connection in an ATM-MSS system, and to restore the existing multicasting connection information even when all of the redundant switch boards fail and replace during operation. An apparatus and method for recovering a multicasting connection in a redundant switch board are provided.

The above and other objects and novel features of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a configuration diagram of ATM-MSS applied to the present invention.

2 is an ATM-MSS configuration diagram according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: element management system 20: node control board

30: clock 40a, 40b: switch

50a, 50b, 50c: subscriber board

Hereinafter, the present invention will be described in detail.

In order to achieve the above object, a preferred embodiment of a multicasting connection recovery device in a redundant switch board of an asynchronous transmission mode multimedia switching system according to the present invention is a multimedia switching system supporting an asynchronous transmission mode. A system manager for managing a system, a node controller connected to the system manager for managing connection, failure, and configuration of the entire system node, a switch unit connected to the node controller and configured with a plurality of switch boards for switching ATM cells, It comprises a clock supply unit for supplying a clock to the switch unit, and a plurality of subscriber boards, the subscriber unit connected to the node control unit and the switch unit.

In the present invention, the node control unit and the switch unit preferably has the same type of multicasting connection information storage memory, and when the switch board is mounted after mounting, multicasting in the multicasting connection information storage memory of the node control unit. It is desirable to restore the multicasting connection information of the switch unit using the connection information.

A preferred embodiment of the multicasting connection recovery method in a redundant switch board of an asynchronous transmission mode multimedia switching system according to the present invention is an asynchronous transmission mode multimedia exchange consisting of a system management unit, a node control unit, a redundant switch unit, a clock supply unit, and a subscriber. In the system, the node control unit stores the same type of information as the multicasting connection information of the switch unit, the connection management module of the system manager requesting a multicasting connection from one source subscriber to multiple destination subscribers, the node control unit Receiving a message about a multicasting connection request by the connection management module of the multicasting group number in an internal multicasting virtual path / virtual channel and multicasting information storage memory required by the connection management module of the node controller; To assign Requesting connection to originating and multiple called subscribers using the allocated multicasting virtual path / virtual channel and multicasting group number, and the multicasting virtual path / And indicating the switch of the called subscriber board to which the cell should be copied to the called subscriber board using the virtual channel and the multicasting group number.

In the present embodiment, the multicasting connection of the failed switch unit may be restored by the node control unit restoring the multicasting connection of the switch unit by using the same type of information as the multicasting connection information stored in the switch unit. It is preferred to further comprise a step.

In addition, in the present embodiment, the failure of the switch unit is generated, the multicasting connection recovery step, the step of mounting a new switch unit in the switch unit is the failure occurs, the configuration management module of the node control unit information that the switch unit is mounted Sending to the connection management module of the node control unit, reporting to the system management unit, when receiving the message that the switch unit is mounted in the connection management module of the node control unit, storing the message in the built-in multicasting information storage memory And restoring the connection by storing the multicasting connection information managed by the connection management module of the node control unit in the multicasting information storage memory of the switch unit again.

The present invention is directed to the ability to recover for multicasting connections.

The present invention stores the multicasting connection information of the switch board in the node control board that monitors the state of the switch board to be restored, and determines that the recovery should be performed. Restore the cast connection information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The configuration of an ATM-MSS according to the present invention will be described with reference to FIG. 2. The configuration of the ATM-MSS according to the present invention is the same as that of the conventional ATM-MSS. However, a function of storing and managing multicasting connection information is provided in the connection management module of the node controller 20 so that multicasting is performed in the switches 40a and 40b when the switch boards 40a and 40b fail and are replaced or revived. It is possible to recover the multicasting connection information to the multicasting connection information managed by the node control board 20 so as to be possible.

The operation of the present invention is described as follows.

The form of the storage memory for multicasting information is made in the node control board 20 in a form similar to that used in the switches 40a and 40b, and stored and managed. When storing in the multicasting information memory of the switch in the node control board 20, if two pieces of switch boards 40a and 40b are mounted, the node control board 20 stores only once in the multicasting information storage memory of the switch. It is stored in the switch boards 40a and 40b.

Information required for the multicasting connection between the calling party and the called party in the element management system 10 (the calling party number, the calling virtual path or the virtual path / virtual channel, the amount of data transmission allowance, the multiple called subscribers for the multicasting) Number, each virtual path or virtual path / virtual channel, etc.) and then request a connection.

Then, the connection management module of the element management system 10 organizes the corresponding connection message into a message form negotiated with the connection management module of the node control board 20 in connection with the connection management module of the node control board 20. send.

When the connection management module of the node control board 20 receives the multicasting connection request message, the node control board 20 allocates a virtual path / virtual channel to be managed for multicasting, and selects any of the switches 40a and 40b. Assign a multicasting group number to find out whether the cell should be sent to the called subscriber.

The calling subscriber requests that the cell coming in from the subscriber connects to multicasting. The necessary information includes the virtual path / virtual channel coming from the subscriber, the multicasting group number, and the virtual path / virtual channel to be sent to the switch (virtual path / virtual channel allocated by the node control board for multicasting for the connection). .

Each incoming subscriber board requires that only one-way connections be made. At this time, the necessary information includes the virtual path / virtual channel (virtual path / virtual channel allocated by the node control board for multicasting for the connection) from the switch and the virtual path / to be transmitted to the called subscriber. It includes a virtual channel.

In addition, a cell having a virtual path / virtual channel and a multicasting group number allocated from the originating subscriber to the switches 40a and 40b via the subscriber boards 50a, 50b, and 50c may receive multiple calls using the multicasting group number. It also stores the switch memory to copy and send the cell to the subscriber board. This step ensures that multiple subscriber subscriber boards always maintain and manage the same information.

If the switch boards 40a and 40b need to be replaced or revived due to a failure during operation by configuring a number of multicasting connections in the above manner, the connection information for the multicastings of the switched switch boards 40a and 40b are all Lost Therefore, it is necessary to recover the multicasting connection information.

When the switch boards 40a and 40b are mounted, the configuration management module of the node controller sends a message to the connection management module and reports to the element management system 10 that the switch boards 40a and 40b are mounted.

When the message is received by the connection management module, the multicasting connection information stored and managed in the multicasting information storage memory is stored again in the multicasting information storage memories of the switches 40a and 40b. This step automatically recovers the connection for multicasting connections in ATM-MSS.

While the invention is susceptible to various modifications and alternative forms, the disclosure thereof has been described with reference to specific embodiments only.

It is to be understood, however, that the invention is not limited to the specific forms referred to in the specification, but rather that the invention is defined by the appended claims, all modifications, equivalents, and substitutes falling within the spirit and scope of the invention. It should be understood to include.

In the present application operating as described above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

When the switch board is mounted after mounting, it automatically restores the multicasting connection information of the switchboard. Therefore, there is no need to set or release the multicasting connection again.

Claims (6)

In the multimedia exchange system supporting the asynchronous transmission mode, A system manager for managing the system; A node controller connected to the system manager to manage connection, failure, and configuration of the entire system node; A switch unit connected to the node control unit and configured of a plurality of switch boards for switching ATM cells; A clock supply unit supplying a clock to the switch unit; And An apparatus for recovering a multicasting connection in a redundant switch board of an asynchronous transmission mode multimedia switching system, comprising a plurality of subscriber boards and a subscriber unit connected to the node control unit and the switch unit. 2. The apparatus of claim 1, wherein the node control unit and the switch unit have the same type of multicasting connection information storage memory. The asynchronous transmission mode multimedia switching system of claim 2, wherein, when the switch board is mounted after mounting, the multicasting connection information of the switch unit is restored by using the multicasting connection information in the multicasting connection information storage memory of the node controller. Multicasting Connection Recovery Device in Redundant Switch Boards. Storing, by the node controller, information in the same form as the multicasting connection information of the switch unit; Requesting, by the connection management module of the system manager, a multicasting connection from one calling subscriber to several called subscribers; Receiving, by the connection management module of the node controller, a message about a multicasting connection request; Allocating a multicasting group number to an internal multicasting virtual path / virtual channel and a multicasting information storage memory required for a multicasting connection by a connection management module of the node controller; Requesting connection to originating and multiple called subscribers using the assigned multicast virtual path / virtual channel and multicasting group number; And Displaying a switch of a called subscriber board to which a cell should be copied to a called subscriber board using the allocated multicasting virtual path / virtual channel and multicasting group number in a multicasting information storage memory of a switch unit. A method for recovering multicasting connections in a redundant switch board of transmission mode multimedia switching system. The multi-casting connection of the switch unit according to claim 4, wherein when a failure occurs in the redundant switch unit that is connected to the multicasting connection, the node control unit uses the same type of information as the multicasting connection information stored in the switch unit. And recovering a multicasting connection in a redundant switch board of an asynchronous transmission mode multimedia switching system. The method of claim 5, wherein the recovering of the multicasting connection of the failed switch unit comprises: Mounting a new switch unit on the failed switch unit; The configuration management module of the node control unit sends the information that the switch unit is mounted to the connection management module of the node control unit, and reporting to the system management unit; When the connection management module of the node controller receives the message that the switch unit is mounted, storing the message in an embedded multicasting information storage memory; And And restoring the connection by storing the multicasting connection information managed by the connection management module of the node control unit again in the multicasting information storage memory of the switch unit. How to Repair Casting Connections.