KR960009466B1 - Testing method of isdn basic access subscriber board in the tdx-ib isdn system - Google Patents

Abstract

receiving a request of an operator on the test of ISDN subscriber board through a terminal connected to an OMP(22); controlling LTAB4(27) through ITEP(23) to allow the subscriber to test the line when the request is received, to switch the subscriber line connected to line matching section of the ISDN basic connection subscriber board to be connected to a to-be-tested line(25) and ISIB(24); and terminating the test, when the test is arranged, the OMP(22) notifies ITEP(23) the arrangement of the test, the ITEP(23) controls the ISIB(24) to carry out the test, and the tested result is outputted to the operator through OMP(22).

Description

Test Method for ISDN Basic Access Subscriber Board of TDX-IB ISDN System

1 is a general ISDN subscriber-to-network connection diagram.

2 is a schematic diagram of a typical ISDN subscriber access subsystem.

3 is a general ISDN basic access subscriber board configuration.

4 is a configuration diagram of a test apparatus for an ISDN basic access subscriber board of a TDX-IB system according to the present invention.

5 is a mounting diagram of the subscriber board test apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

21: terminal

22: Operations and Maintenance Processor

23: In Test Equipment Processor (ITEP)

24: ISDN (ISDN Subscriber In test Board)

25: measuring line

26: switch circuit

27: Line Test Access Board (LTAB)

The present invention relates to a test method for testing an ISDN basic access subscriber board developed for adding a subscriber-network access function of an integrated information communication network (ISDN) to a TDX-IB exchanger according to an operator's request.

In ISDN, B-channel (64Kbps) used for information transmission and D-channel used for transmission of signal information and packet information for circuit switching using the existing subscriber line of basic subscriber-to-network basic access method with subscriber station Figure 1 shows the basic connection configuration between the subscriber and the network in a manner of switching to. The ISDN terminal 1 has a connection standard of the S reference point in accordance with the CCITT recommendation, and is connected to the line terminator 3 including the subscriber board corresponding to the present invention through the two-wire subscriber line through the subscriber access device 2. .

2 shows a typical ISDN subscriber access subsystem.

DS-BUS is a parallel bus that connects various bus signals of a processor through a back board for inter-processor communication in an ISDN subscriber sub-system, and transmits data between a plurality of subscriber boards 5 and the network layer processing unit 4. Provides a communication channel for

In FIG. 2, the subscriber board 5 exchanges network layer signal information with the network layer processing unit 4 through the DS-BUS, and the network layer processing unit 4 transmits the call control information to the B-bus of the TDX-IB switch. BUS) to exchange with the call control unit 6. Here, the B-BUS (BUS) is a bus that provides serial communication. The call control unit 6 is implemented by changing the software of an existing call line processor (SLP).

One subscriber board 5 accepts 8 subscribers, connects B-channel information to the DLC (Digital Line Concentrator) 7 of the exchange, and exchanges packet information with the packet processing unit 8 via the DP-BUS. . Here, the DP-BUS is a serial communication bus for transmitting packet information.

3 is a block diagram of a general ISDN basic access subscriber board.

The line matching unit 9 maintains frame synchronization and exchanges 25B + D channel information and maintenance-related information through a network termination and a two-wire subscriber line. The D channel separated by the line matching section 9 is connected to the D channel processing section 10, and the B channel is connected to the DLC 7 of the exchange via the PCM connection section 11.

The D-channel processing unit 10 controls basic high level data link control (HDLC), such as flag detection and generation, zero bit removal and insertion, CRC irradiation and generation, and abnormal frame detection. It has a function and has a FIFO processing function for extracting and inserting an information area in a frame to be processed by the processor control unit 12.

The PCM connection unit 11 supplies the clock synchronized with the clock signal received from the DLC 7 to the operation clock in the subscriber board, and under the control of the processor control unit 12, the B channel of the line matching unit 9 is provided. The connection is made to the DLC 7.

The processor control unit 12 interprets the information received from the D-channel processing unit 10 and sends the network layer information to the network layer processing unit 4 via the DS-BUS connection unit 13, and the packet information is transmitted to the DP-BUS connection unit 14. Is transmitted to the packet processing section 8 through Since the TDX-IB ISDN system accommodates existing subscribers and ISDN subscribers, the above-described test capability for ISDN basic access subscriber boards should be added to the TDX-IB exchange in addition to the test functions for existing subscriber boards.

An object of the present invention is to define a test function for an ISDN basic access subscriber board and to present an implementation method thereof.

In order to achieve the above object, the present invention defines a test function for determining an error state in which service is not available by analyzing the function of an ISDN basic access subscriber board, and a method for realizing this and an effective function in a processor system of an existing exchange. Provide additional options.

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

4 is a configuration diagram of a test apparatus for an ISDN basic access subscriber board of a TDX-IB system according to an embodiment of the present invention, in which 21 is a terminal, 22 is an operations and maintenance processor (OPM), and 23 is an in test equipment processor (ITEF). 24 denotes ISDN (ISDN Subscriber In Test Board), 25 denotes a line under test, 26 denotes a switch circuit, and 27 denotes a line test access board (LTAB).

The test apparatus for the ISDN basic access subscriber board receives an operator's test command from the terminal 21, which is a non-intelligent terminal, controls the test state and finally outputs a test result to the terminal 21. (22), an ITEF (23) performing control by performing various test functions upon receiving a test request from the OMP (22), ISIB (24), ISDN which is a measuring device which performs a test under the control of the ITEF (23). The circuit under test 25 corresponding to the subscriber under test in the subscriber board, the switch circuit 26 for connecting the B channel of the circuit under test 25 with the ISIB 24 under the control of the OMP 22; It consists of LTAB4 (27) which transfers the subscriber line connected to the to-be-measured line (25) to connect the to-be-measured line (25) and the ISIB (24).

Looking at the test method for the ISDN basic access subscriber board, if the first self-detection or failure report is received, the operator requests a test for the ISDN basic access subscriber board through the terminal 21 connected to the OMP (22).

The OMP 22 controls the LTAB4 27 through the ITEP 23 so as to perform a circuit test for each subscriber upon receiving a test request, so that the line matching unit 9 of the ISDN basic access subscriber board, which is the circuit under test 25, is operated. The subscriber line connected with the switch is switched to be connected to the circuit under test 25 and the ISIB 24 as the test apparatus.

When the preparation for the test is completed as described above, the OMP 22 notifies the ITEP 23 of the fact, and the ITEP 23 controls the ISIB 24, which is a test apparatus, for every test item step by step. The test results performed and output the results to the operator through the OMP (22).

According to the new digital characteristics of ISDN Basic Access Subscriber Board, the test function and method to determine the fault are defined as follows.

Activation test

When the ISIB 24, which is a test device, starts the activation and recognizes the activation state within 15 seconds (since it is a cold start) at the request of the ITEP 23, the function of the corresponding line matching unit 9 of the subscriber board is tested. The steady state is reported to the ITEP 23.

-D channel treatment test

As a function of testing the D-channel processing function of the subscriber line, the ISIB 24, which is a test apparatus, reports the setting of the data link to the IETP 23 as a normal state when requesting the corresponding subscriber board.

-B1 channel loopback test

The ISIB 24, which is a test device, has a subscriber access device therein. It is a function to test whether the user information (B1 channel) transmission path for the subscriber subscriber line under test is normal.

At the request of the ITEP 23, the ISIB 24, which is a tester with a built-in subscriber access device, loops back the B1 channel to the network side and then transmits pseudo-random data or a predetermined pattern through a specific channel of the DCL (2.048 Mbps). .

In FIG. 4, when the data is inputted to the subscriber board via the switch circuit 26, the data is looped back from the ISIB 24, which is a test apparatus, and returned through the 2-wire line, so that the test apparatus ISIB 24 compares the data. Normal status is reported to ITEP (23).

-B2 channel loopback test

Test for channel B2 in the same manner as for loop loop B1.

-CRC monitoring test

In the subscriber board, the frequency of CRC error, power state in subscriber access device, and loopback are implemented by M channel in 2B1Q frame of subscriber line at each subscriber line. Test the CRC monitoring function to test it.

The ISIB 24 as a test apparatus artificially induces a CRC error, recognizes the CRC error at the subscriber board, and checks whether the state is transmitted to the ISIB 24 as the test apparatus by using the Far End Block Error (FEBE) bit. .

Deactivation test

In the ISDN basic access section, to reduce the power consumption of subscriber access devices and ISDN terminals when not in a call, the switching network transitions the basic access section to an inactive state and tests the inactivity control function on the subscriber board performing this function.

The ISIB 24, which is a test apparatus, starts a timer from the time when the activation state is recognized as a result of the activation test, and checks whether it is deactivated within a predetermined time.

Loop current measurement

In the test for measuring the feed current of the circuit under test 25, a loop is formed in the test apparatus ISIB 24 to test the power supply capability.

Since TDX-IB ISDN system is implemented to perform analog subscriber and ISDN subscriber at the same time, the shape of related system of test method for subscriber board is similar to that of subscriber line of analog subscriber board (GSLB) and digital subscriber board (BASB). It was designed to have the following system configuration so that the test could be parallel.

-ITEP (23) is the same as the existing one to modify the firmware (firmware).

-Use the existing analog switch boards LTAB1 to LTAB3 and LTAB4-O LTAB4-2 as they are.

-The ISIB 24, a test device for the digital subscriber line, is further developed and mounted on the back board.

The analog switch boards LTAB1 to LTAB3 and the ISIB 24 can operate independently under the control of the ITEP 23, and can be installed together to operate individually.

5 shows a mounting form in which an analog test apparatus and a digital test apparatus are installed together.

The present invention as described above can provide an improved ISDN service with a low failure rate by presenting an implementation manner of adding a test function for each circuit of an ISDN basic access subscriber board that accommodates ISDN terminals to a domestic TDX-IB switch. It works.

Claims (1)

Terminal 21, which is a non-intelligent terminal, receives an operator's test command from the terminal 21, controls the test state, and finally outputs a test result to the terminal 21, OMP (Operations and Maintenance Processor) 22, Upon receiving a test request from the OMP 22, an In Test Equipment Processor (ITEP) 23, which controls and performs various test functions, performs a test under the control of the ITEP 23 by embedding a subscriber access device therein. ISDN (ISDN Subscriber In Test Board) 24, which is a measuring device, a to-be-tested line 25 corresponding to a subscriber to be measured in an ISDN subscriber board, and the control of the to-be-tested line 25 under the control of the OMP 22. The switch circuit 26 connecting the B channel to the ISIB 24 and the subscriber line connected to the circuit under test 25 are switched to LTAB4 (to which the circuit under test 25 and the ISIB 24 are connected). ISDN basic access consisting of Line Test Access Board 4) (27) In the test method for particle board, comprising: a first step of an operator is required to test for the ISDN subscriber board accepts its own error detection or failure notification via the OMP (22), a terminal 21 connected with; Upon receiving the test request, the LTAB4 (27) is controlled through the ITEP (23) so that the subscriber can be connected to the line matching unit (9) of the ISDN Basic Access Subscriber Board, which is the circuit under measurement (25), so as to perform a circuit test for each subscriber. A second step of transferring the circuit line 25 and the ISIB 24 as a test apparatus; When the preparation for the test is completed, the OMP 22 notifies the ITEP 23 of this fact, and the ITEP 23 controls the ISIB 24, which is a test apparatus, to perform all test items step by step. Test method for the ISDN basic access subscriber board, characterized in that the third step of outputting the test results to the operator through the OMP (22).