KR100236938B1 - Path testing method of atm switching system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Path test method between two matching modules in different subscriber switching subsystems.

2. The technical problem to be solved by the invention

During the operation of the switching system, it is intended to enable the path test for all matching modules in different subscriber switching subsystems according to the operator's requirements.

3. Summary of Solution to Invention

If a path test command is input during system operation, bandwidth is allocated to the ports connecting the two matching modules from the call processing function as in the case of processing a general user call, and the routing tag information is notified to the subscriber / relay line matching module controller. After that, test information is sent to the test device to request the test to be started, and when the test result is transmitted from the test device, the operator is notified of the path test result.

4. Important uses of the invention

Used to test the path of ATM switching system.

Description

Path test method between matching modules in different subscriber switching subsystems in asynchronous delivery mode switching system

The present invention relates to a method for testing a path between two interface modules (IMs) in different ATM local switching subsystems (ALS) in an Asynchronous Transfer Mode (ATM) switching system.

The ASW (Access Switch), a switch in the ASS of the Asynchronous Switching Mode (ATM) switching system, consists of 32X32 input / output ports, each of which is connected to a call connection control processor (CCCP) or a subscriber / relay line. It is connected to the matching module (SIM / TIM) and to the central switch (CSW) of the central switching subsystem (ACS).

In the Asynchronous Transfer Mode (ATM) switching system, general user call service occurs between two matching modules (IM), so if the call service is not connected or a failure occurs during the call, the connection state and performance state between the two matching modules (IM) are checked. You need a way to test it.

Existing asynchronous delivery mode (ATM) switching system does not have a test method to check the connection status between two matching modules (IM) existing in different subscriber switching subsystems (ALS) during system operation. There is a need for a path test method that does not affect end user call services.

Accordingly, the present invention enables the path test for all matching modules (IM) existing in different subscriber switching subsystems (ALS) according to the operator's request during the operation of the ATM switching system, and counts the number of cells generated to test. Its purpose is to provide a path test method that can be manipulated in various ways.

1 is a schematic configuration diagram of an asynchronous transfer mode (ATM) exchange system to which the present invention is applied;

2 is an explanatory diagram of an inter-block operation for performing a path test;

3 is a diagram illustrating a path connecting two matching modules in different subscriber switching subsystems (ALS);

4 is a table showing routing tag information for a path test between two matching modules in different subscriber switching subsystems (ALS).

5A through 5C are process flow diagrams of a path test method between matching modules in different subscriber switching subsystems according to the present invention;

* Explanation of symbols for main parts of the drawings

11: ATM Local Switching Subsystem (ALS)

12: ATM Central Switching Subsystem (ACS)

13 Subscriber Interface Module (SIM)

14 Trunk Interface Module (TIM)

15: Access Switching Network Module (ASNM)

16: Call Connection Control Processor (CCCP)

17 test device

18: Interconnection Switch Network Module (ISNM)

19: Operation and Maintenance Processor (OMP)

In order to achieve the above object, the present invention provides a path test between two matching modules in different subscriber switching subsystems applied to an asynchronous delivery mode switching system. When receiving the request, the bandwidth of the start matching module is allocated using the information input from the operator, and the start matching module is prepared to perform loopback, and then the bandwidth of the start port connected to the central switching subsystem is allocated. After performing the first step and the first step, the bandwidth of the termination matching module is allocated using the information input from the operator, and the termination matching module is prepared to perform the loopback, and then the termination connected to the central switching subsystem. The second step of allocating the band of the port, and after performing the second step, to add to the test cell A third step of requesting a path test to the test apparatus by extracting the Wuting header information, and upon receiving a path test result from the test apparatus, canceling the ready state of the start matching module and the ending matching module, and connecting the central switching subsystem to the central switching subsystem. After returning the band of the start and end ports, characterized in that it comprises a fourth step of outputting the path test results to the operator.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 shows a schematic diagram of an asynchronous transfer mode (ATM) exchange system to which the present invention is applied.

In general, the ATM switching system is largely composed of a plurality of subscriber switching subsystems (ALS) 11 and a central switching subsystem (ACS) 12.

Subscriber Switching Subsystem (ALS) 11 includes an Access Switching Network Module (ASNM) 15, which is a self routing switch module, and is a call connection control processor for user call processing and maintenance. (CCCP) 16, a Subscriber Interface Module (SIM) 13 for registration with subscribers, and a Trunk Interface Module (TIM) 14 for registration with relay lines. do.

A subscriber switching subsystem (ALS) 11 operates as a concentrating device having an aggregation ratio of n: m, where n is the number of user-side links and m is the number of switch-side links, and the central switching subsystem (ACS) 12 Performs the interconnection function between the subscriber switching subsystem (ALS) 11 to operate as a distribution device for a large capacity system.

When a call request is made from a subscriber, the subscriber switching subsystem (ALS) 11 detects it, performs a call service, and calls the corresponding subscriber switching subsystem through the called subscriber number under the control of the originating subscriber switching subsystem (ALS). ALS) and request translation of the number to the called subscriber exchange subsystem (ALS).

The terminating subscriber exchange subsystem (ALS) selects an optimal path at the same time as number translation and notifies the originating subscriber exchange subsystem (ALS), and the originating subscriber exchange subsystem (ALS) establishes a call path.

The originating subscriber exchange subsystem (ALS) counts the cells delivered during the call, sends the billing data to the central switching subsystem (ACS) along with the user requested service after the call completes, and the originating subscriber exchange subsystem (ALS). Restores the call data to a dormant state.

The central switching subsystem (ACS) 12 is a pure interconnector without call processing that exchanges information between the subscriber switching subsystems (ALS), unlike the subscriber switching subsystem (ALS), the call connection control processor. Do not put (CCCP).

An Interconnection Switch Network Module (ISNM) 18, which is a switch network module of the central switching subsystem (ACS), uses the same switch element as a subscriber switching subsystem (ALS) as a magnetic routing switch. Can be. In addition, the Central Exchange Subsystem (ACS) has an Operation and Maintenance Processor (OMP) (19) for system-wide operation and maintenance, as well as system-wide maintenance, testing, measurement, and statistical functions. Mass storage device control management and various input / output statement control with the operator.

Here, the test apparatus 17 exists for each subscriber switching subsystem (ALS) and performs a test function.

Figure 2 shows the functional block connection for the path test between two matching modules (IM) present in different subscriber switching subsystems (ALS) according to the present invention.

The path test input / output command processing block 21 located in the operation and maintenance processor (OMP) 19 performs a function of processing a command input from an operator, and the path test input / output command processing block 21 is a path from the operator. When the test command is input, a test request is made to the path test block 22 that controls the test target path, and the result is notified from the path test block 22 and output to the operator.

The path test block 22 is located in the call connection control processor (CCCP) 16 and performs a series of tasks to prepare for the path test. That is, when the path test block 22 receives the path test request from the path test input / output command processing block 21, the path test block 22 requests the bandwidth allocation required for the path test to the call processing block 23, and if a band is allocated, the matching module IM; After notifying the routing tag information to the subscriber / relay line control unit 24, and receiving a response from the matching module control unit 24, the test information is sent to the test device 17 to request the start of the test. The test information sent to the test device consists of routing tag information attached to the test cell, the number of test cells, the test run time, and the traffic generation mode.

When the test result is transmitted from the test apparatus 17, the path test block 22 notifies the test result to the path test input / output command processing block 21.

The call processing block 23 manages currently available bands, and performs a function of allocating / releasing a band required for a path test.

The matching module controller 24 performs a function of loopbacking the routing tag of the test cell entering the matching module IM according to the routing tag information transmitted from the path test block 22.

The test apparatus 17 generates a test cell including the routing tag information input from the path test block 22 and transmits the test cell along the corresponding path, and transmits the received cell when the transmitted cell is received through the path. By comparing and analyzing the cells, the number of lost cells, the number of error cells, the number of duplicate cells, the average cell transmission delay, and the like are measured, and the result is notified to the path test block 22.

When the path test is completed, the path test block 22 returns the band to the call processing block 22, and notifies the matching module controller 24 of the end of the loopback.

3 is a diagram illustrating a connection path between two matching modules IM in different subscriber switching subsystems (ALS).

When the operator inputs a command including the contents of [Table 1] for the path test, the path test block performs the preparation process necessary for the path test, and when the preparation is completed, the test device requests the test cell generation (31). . The test apparatus generates a test cell (32) and transmits it to the start matching module (start_IM) (33), and the start matching module transmits the path test cell to the end matching module (end_IM). The information is changed and transmitted to the termination matching module (34).

The termination matching module changes the routing tag information of the test cell so that the received test cell 37 can be transmitted to the test apparatus, and transmits it to the test apparatus (38). The test apparatus analyzes the test cell 41 looped back from the termination matching module and notifies the test result to the path test block in the call connection control processor (CCCP) (42).

FIG. 4 shows routing tag information attached by a test apparatus, a start matching module, and an ending matching module to perform a path test connecting two matching modules IM in different subscriber switching subsystems ALS.

The test apparatus assigns the port number to which the start matching module is connected to the first byte of the routing tag in order for the test cell to be transmitted to the start matching module.

The start matching module is connected to the start port switch (start_ASW) and the central switch (CSW) at the first byte of the routing tag, and the center switch at the second byte to transfer the test cell received from the test equipment to the end matching module. (CSW) and the connection port number of the termination connection switch, and give the port number of the termination matching module to the third byte.

The end matching module is connected to the port number of the end connection switch (ASW) and the center switch (CSW) in the first byte, and the center switch (CSW) in the second byte to return the test cell received from the start matching module to the test apparatus. The connection port number of the connection switch (ASW), and the third byte is assigned the port number to which the test device is connected.

[Table 1] shows the path test input command contents. The path test input contents are the start connection switch (ASW) number, the port number to which the start matching module is connected, and the port number to connect the start connection switch (ASW) and the central switch (CSW). , End connection switch (ASW) number, port number to which end matching module (IM) is connected, port number connecting end connection switch (ASW) and central switch (CSW), path test progress time, path test bandwidth, traffic mode ( 1 cell / equal cell / burst cell).

TABLE 1

Input Command Content

Start ASW number Start_im port number Port number to connect starting ASW and CSW End ASW Number End_IM port number Port number connecting ASW and CSW Path test progress time (minutes) Path test bandwidth (cell unit) Traffic mode (1 cell / even cell / burst cell)

[Table 2] shows the path test result output. The path test output shows the start connection switch (ASW) number, the port number to which the start matching module (IM) is connected, and the start connection switch (ASW) and the central switch (CSW). Port number, end connection switch (ASW) number, port number to which end matching module (IM) is connected, port number connecting end connection switch (ASW) and central switch (CSW), path test progress time, path test bandwidth, Traffic mode, number of test cells generated, number of received cells, number of error cells, number of lost cells, number of duplicate cells, and cell transmission delay time.

The number of test cells generated is the number of test cells generated for the test, and the number of cells in which an error occurs is measured by a header error control (HEC) test or a cyclic redundancy check (CRC). If the number of lost cells is discontinuous in the cell number among correctly received cells without error, cell loss is generated by the number of discontinuous cells. The number of duplicated cells is determined to be a duplicated cell if the cell number has the same value among cells correctly received without error. The cell transmission delay time measures the cell transmission delay time in microseconds by measuring the cell transmission time and the reception time.

TABLE 2

Path test result output contents

Start ASW number Start_im port number Port number to connect starting ASW and CSW End ASW Number End_IM port number Port number connecting ASW and CSW Path test progress time (minutes) Path test bandwidth (cell unit) Traffic mode (1 cell / even cell / burst cell) Number of test cells generated Receive Cells Error cell count Lost Cell Count Duplicate Cells Cell transmission delay time (micro sec)

5A-5C show a flow chart of a path test method according to the present invention.

When the operator requests the path test, the path test preparation for the path test start matching module IM is performed (101). Referring to FIG. 5B, the start matching module path test preparation process, first, the path test block requests allocation of bandwidth required for the path test in both directions for the port connecting the start matching module IM to the call processing block (201). ).

When the bandwidth is allocated from the call processing block (202), the address of the start matching module (IM) controller is calculated (204), and the start matching module (IM) loops back the test cell received from the test apparatus to the ending matching module (IM). The information to be added to the routing tag header is extracted (205) and transmitted to the start matching module (IM) control unit (206).

The start matching module (IM) controller notifies the preparation completion when the preparation for looping back the test cell is completed (207) and not the preparation completion (207), and notifies the preparation incomplete (203). In addition, if the bandwidth for the port connecting the start matching module IM is not allocated (202), the preparation is notified of completion (203) and the path test is not output to the operator (103).

When the start matching module (IM) is ready for the path test (102), the bandwidth allocation for the port of the start central switching subsystem (ACS) connecting the start connection switch (ASW) and the central switch (CSW) is called a call processing block. (104).

If no band is allocated for the start ACS port (105), it deactivates the start match module (IM) path test preparation (106), outputs to the operator that it cannot perform the path test (103), and starts by the call processing block. When a band for the port of the ACS is allocated 105, the path test preparation for the termination matching module IM is performed (107).

Path test preparation for the end match module (IM) is similar to the start match module (IM) path test preparation.The path test block sets the bandwidth required for the path test to the port that connects the end match module (IM) to the call processing block. When the allocation request is made for both directions (201) and the bandwidth is allocated from the call processing block (202), the address of the ending matching module (IM) control unit is calculated (204), and the ending matching module (IM) is determined from the starting matching module (IM). In order to loop back the received test cell to the test apparatus, information to be attached to the routing tag header is extracted (205) and transmitted to the termination matching module (IM) control unit (206).

The termination matching module (IM) control unit notifies the completion of preparation when the preparation for looping back the test cell is completed (207) (208), and notifies the completion of preparation (207) when the preparation is not completed (207). If the bandwidth for the port connecting the end matching module IM is not allocated (202), the preparation completion notification is notified (203), and the path matching preparation of the start matching module IM is released (109), and the start ACS is performed. The band allocated to the port is returned (110), and a path test is not performed to the operator (103).

When the termination matching module IM is ready for the path test (108), the bandwidth request for the termination ACS port connecting the termination connection switch (ASW) and the central switch (CSW) is requested as a call processing block (111). .

When a band for the terminating ACS port is allocated by the call processing block (112), the test apparatus extracts routing header information to be attached to the test cell (116) and requests the test apparatus to perform a path test (117).

When the path test result is received from the test apparatus (118), the preparation of the start matching module (IM) is released (119), the band for the starting ACS port is returned (120), the termination matching module (IM) preparation is released ( 121, after returning the band for the end ACS port (122), and outputs the result of performing the path test to the operator (123).

If no band has been allocated for the ending ACS port (112), the preparation of the start matching module (IM) is released (113), the band for the starting ACS port is returned (114), and the preparation of the ending matching module (IM) is released. After (115), outputting the failure to perform the path test to the operator (103).

Referring to FIG. 5C, referring to the process of releasing preparation for path test for the start matching module IM and the end matching module IM, first, the allocated bandwidth is returned (301), the start matching module (IM) control unit, and the end matching. The address of the module IM controller is calculated (302) and the end matching module (IM) controller and the end matching module (IM) controller are notified of the end of the path test (303).

The present invention described above is capable of various substitutions, modifications, and changes within the scope without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains, and thus is limited to the above-described embodiments and drawings. It is not.

The present invention as described above can be carried out through the operation of the MMC (Man Machine Communication) command during the operation of the switching system, it is possible to test for all matching modules (IM) of all subscriber switching subsystem (ALS), and to test By controlling the number of cells generated for various purposes, it is possible to detect and prevent the failure condition in advance so that the availability of the internal path of the switch, the stability of the path, and the reliability can be improved. As in the case of processing, since the path test is performed by receiving the bandwidth allocation, the path test can be performed without affecting the ongoing call processing service.

Claims (6)

In the path test method between two matching modules in different subscriber switching subsystems applied to an asynchronous delivery mode switching system, Upon receiving a path test request between two matching modules in different subscriber switching subsystems from the operator, the bandwidth of the starting matching module is allocated using information input from the operator, and the starting matching module is prepared to perform loopback. A first step of allocating a band of a starting port associated with a central switching subsystem; After performing the first step, the bandwidth of the termination matching module is allocated using the information input from the operator, and the terminal is prepared to perform the loopback, and then the bandwidth of the termination port connected to the central switching subsystem is determined. A second step of being assigned; A third step of, after performing the second step, extracting routing header information to be added to a test cell and requesting a path test to a test apparatus; And Upon receiving the test result from the test apparatus, the preparation of the start matching module and the ending matching module is canceled, the bands of the start and end ports connected to the central switching subsystem are returned, and the test results are output to the operator. A path test method between two matching modules in different subscriber switching subsystems comprising the fourth step. The method of claim 1, The first step is, The path test block requires the allocation of a bidirectional bandwidth for the path test to the port connecting the start matching module to the call processing block; When the bandwidth is allocated from the call processing block, the address of the start matching module controller is calculated, and the start matching module extracts information to be attached to the routing tag header to loop back the test cell received from the test apparatus to the end matching module. Transmitting to the matching module controller; When the start matching module controller is ready to loop back the test cell, notifying the completion of the preparation, and if the preparation is not completed or the bandwidth is not allocated, outputting to the operator that the path test is not performed; Requesting a bandwidth allocation for a port of a starting central switching subsystem connecting the starting connection switch and the central switch to the call processing block when the starting matching module is ready for a path test; And If the bandwidth is not allocated to each other characterized in that it comprises the step of releasing the path test preparation of the start matching module, outputting the failure to perform the path test to the operator, and performing the second step if the bandwidth is allocated. Path test method between two matching modules in different subscriber switching subsystems. The method of claim 2, The second step, Requesting, by a path test block, to allocate a bidirectional bandwidth for a path test to a port connecting the termination matching module to a call processing block; When the bandwidth is allocated from the call processing block, the address of the end matching module controller is calculated, and the information to be attached to the routing tag header is extracted by the end matching module to loop back the test cell received from the start matching module to the test apparatus. Transmitting to the end matching module controller; When the end matching module controller is ready to loop back the test cell, the preparation completion notification is notified. If the preparation is not completed or the bandwidth is not allocated, the start matching module releases the path test preparation of the start matching module, and the start central switching subsystem. Returning the band allocated to the port of the controller, and outputting to the operator that the path test is not performed; Requesting a bandwidth allocation for a port of a termination central switching subsystem connecting the termination connection switch and the central switch when the termination matching module is ready for a path test; If the bandwidth for the port of the terminating central switching subsystem is not allocated, the preparation of the start matching module is released, the band for the port of the starting central switching subsystem is returned, and the preparation of the terminating matching module is released. Thereafter, outputting to the operator that the path test is not performed; And And performing a third step if a bandwidth for a port of the terminating central switching subsystem is allocated by a call processing block. The method of claim 3, wherein Path test preparation release of the start and end matching module, And returning the port bandwidth allocated to each, and calculating the address of each matching module control unit and notifying the end of the path test to each matching module control unit. Test method for path between two matching modules in a circuit. The method of claim 4, wherein The data input from the operator upon request of the path test, The start connection switch number, the port number to which the start matching module is connected, the port number to connect the start connection switch and the central switch, the end connection switch number, the port number to which the end matching module is connected, A path test method between two matching modules in different subscriber switching subsystems including port number to connect, path test progress time, path test bandwidth, and traffic mode. The method of claim 4, wherein The path test result output data is The start connection switch number, the port number to which the start matching module is connected, the port number to connect the start connection switch and the central switch, the end connection switch number, the port number to which the end matching module is connected, Port number to connect to, path test progress time, path test bandwidth, traffic mode, number of test cells generated, number of received cells, number of error cells, number of lost cells, number of duplicated cells, and cells A method for testing paths between two matching modules in different subscriber switching subsystems, including transmission delay time.

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