KR200294091Y1 - Apparatus for ATM cell path test in a ATM switch - Google Patents

Abstract

The present invention is for verifying a system by transmitting and receiving a cell through a cell path test board without using test equipment in an ATM switch, and establishing a permanent virtual line connection between subscribers through a switching means during a cell path test. A processor module; A low speed subscriber matching module for matching up and down ATM cells to subscribers and having a cell path tester for transmitting and receiving test cells; A high speed subscriber matching module for transferring the test cells transmitted from the low speed subscriber matching module to the switching means through the permanent virtual line connection established by the processor module, and looping back the test cells received from the permanent virtual line; It includes switching means for routing ATM cells between high-speed and low-speed subscriber matching modules, and cell path test boards are mounted in positions connected with ATM physical layer matching boards to form cell boards without multiple measuring devices. Can be verified.

Description

Apparatus for ATM cell path test in a ATM switch}

The present invention relates to asynchronous transfer mode (ATM) cell path test, and more particularly, it is suitable for verifying a cell path section with a cell path test board without using test equipment in an ATM switch. The present invention relates to a cell path test apparatus for an asynchronous transfer mode switch.

The terms used below are defined.

ATM Interface Module (AIM): High speed subscriber matching module.

AMM (Access Multiplex Module): Low speed subscriber network matching module.

API Physical Interface Assembly (APIA): ATM physical layer matching board.

BAIA, HAIA, MAIA: Basic rate / High rate / Medium rate ATM Interface Assembly: Subscriber registration board.

BPAA (Buffering and Port Adaptation board Assembly): I / O buffer and port connection switch board.

Cell Path Test Board Assembly (CPTA): Cell Path Test Board.

Cell Routing and Port Adaptation board Assembly (CRIA): Cross Bar Switch Board.

FRIA (Frame Relay and Interconnection board Assembly): Frame relay subscriber interface board.

HALA (High speed ATM Layer Assembly): ATM layer processing board.

MMCA (Media Gateway Module Control board Assembly): Low speed subscriber control board.

MP (Main Process): Including main processor module, SMC, ACC, AMC.

PIMA (Processor Interface Module board Assembly): Process matching module board.

PVC (Permanent Virtual Circuit): Permanent virtual circuit.

UNI (User to Network Interface): Subscriber interface.

In general, an ATM can report maintenance operation information in a communication channel. Thus, even when a network in the communication channel fails, the remaining terminal of the unbroken communication channel below the point of failure is used to immediately notify the receiving terminal of the failure, and the lower terminal (receiving terminal) Operation information can be notified to the upper terminal (sending terminal) using the reverse channel. As such, end-to-end testing from terminal to terminal is easily realized in ATM. In the event of a bit error in the communication channel, the OAM cell that tests the nature of the bit error can be sent to identify and inspect the bit error interval without interrupting service.

The ATM cell path section test will be described focusing on the HANbit ACE2000 ATM switch.

The HANbit ACE2000 ATM Switch supports data rates of 40 Gbps, is designed to scale up to 160 Gbps, and uses commercially available development languages C and C ++.

1 is a block diagram of a typical HANbit ACE2000 ATM switch.

According to Figure 1, the HANbit ACE2000 ATM switch is largely divided into the main processor module 110, the low speed subscriber matching module 120, the high speed subscriber matching modules 131A and 132A, and the cross-routing board assembly (CRIA). 140.

Test equipment is used to verify the ATM exchange. When the test equipment generates a test cell and sends it to the ATM exchanger, the test cell is received back to the test equipment via an ATM switch through a pre-set Permanent Virtual Circuit (PVC) connection. The test equipment compares the received test cell with the transmitted test cell to determine whether there is an abnormality in the system, that is, the ATM switch.

Figure 2 is a configuration example of the test environment of the ATM switch according to the prior art, the specific procedure for performing the cell path interval test is as follows.

2, the PVC connection between each subscriber board is established at the operation terminal of the ATM switch 220. PVC connections within an ATM switch include a subscriber matching board (BAIA) 221, an ATM layer processing board (HALA) 222, an input / output buffer and port connection switch board (BPAA) 223, and a crossbar switch board (CRIA) ( 224).

The test equipment 210 generates a test ATM cell for the cell path section test. At this time, the generated ATM cell is a test cell and is transmitted to the ATM switch 220. Cell transfer is performed through the optical cable between the ATM switch 220 and the test equipment 210.

The test cell starting from the test equipment 210 is received back to the test equipment 210 via the PVC connection inside the ATM switch 220.

As such, the test equipment 210 compares the received test cell with the transmitted test cell. When the comparison confirms that no cell loss has occurred, it is determined that all boards are operating normally.

Therefore, in order to test the current HANbit ACE2000 ATM switch, equipment that can generate / measure test cells is indispensable. However, there is a problem that it is difficult to carry out a reliability test for system verification at a sufficient frequency because it does not have many kinds of equipment for testing after board production or verification during installation and operation.

In addition, although a board for testing a cell path has been manufactured in the past, since such a board performs a path test through an interprocessor communication (IPC), the reliability of the test is lower than that of a real subscriber transmitting a cell.

The present invention was created to solve the above-mentioned conventional problems, and an object of the present invention is to verify a system by transmitting and receiving a cell through a cell path test board without using test equipment in an ATM exchanger. The present invention provides a cell path test apparatus for an asynchronous transfer mode switch.

The cell path test apparatus of the asynchronous transmission mode switch of the present invention for achieving the above object comprises: a processor module for establishing a permanent virtual line connection between subscribers through a switching means in a cell path test; A low speed subscriber matching module for matching up and down ATM cells to subscribers and having a cell path tester for transmitting and receiving test cells; A high speed subscriber matching module for transmitting a test cell transmitted from the low speed subscriber matching module to a switching means through a permanent virtual line connection established by the processor module, and looping back a test cell received from the permanent virtual line; And switching means for routing ATM cells between the fast and slow subscriber matching modules.

1 is a block diagram of a typical HANbit ACE2000 ATM switch.

2 is a block diagram of a cell path test apparatus of an ATM switch according to the prior art.

3 is a block diagram of an ATM cell path test apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

410: main processor module 420: low-speed subscriber matching module

424: low speed subscriber control board 430: high speed subscriber matching module

431A, 431B: ATM layer processing board 432A, 432B: I / O buffer and port connection switch board

440: crossbar switch board 450: PC

461: cell path test board 425, 462: ATM physical layer matching board

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment according to the present invention.

In the present invention, the subscriber board to verify the path with the switch board, that is, the ATM cell path, to achieve this function, the following representative embodiments are expected.

In the first embodiment, a test board for transmitting and receiving test cells is mounted in place of a low speed subscriber control board (MMCA) in a HANbit ACE2000 ATM switching system, and a test cell is transmitted and received to a subscriber matching board to check for cell loss. In other words, when the cell path test is required after the test module is prepared, the low speed subscriber control board (MMCA) is mounted and then mounted at the location to test the cell path.

In another embodiment, a test board and a back board including an ATM physical layer matching board (APIA) are fixedly mounted in a system and operated as a module for cell path test. This method can reduce the trouble of mounting / mounting the subscriber matching board and the test board during the cell path test, and can be easily implemented through a simple modification of the first embodiment.

The following description will focus on the first embodiment.

3 is a block diagram of a cell path test apparatus of an asynchronous transmission mode switch according to a first embodiment of the present invention.

According to Fig. 3, the HANbit ACE2000 ATM switch is composed of a main processor module 410, a low speed subscriber matching module 420, a high speed subscriber matching module 430, and a crossbar switch board 440. The section to be tested is a path section from the subscriber matching module to the crossbar switch board 440.

This embodiment separately configures the cell path test board 461 for the cell path test. In the subscriber service, if the low speed subscriber matching module 420 includes the low speed subscriber control board 424 and provides the ATM cell transmission / reception service, and the test of the ATM cell path is performed, the low speed subscriber control board 424 is replaced with the cell. Mount the path test board 461. The cell path test board 461 is responsible for transmitting and receiving a test cell to the crossbar switch board 440 through the ATM physical layer matching board 462.

The personal computer (PC) 450, the terminal, and the operation terminal are responsible for generating the test cell and reporting the test result, and the cell path test board 461 is responsible for determining the transmission, reception, and cell loss of the test cell. do.

The procedure for performing an ATM cell path test in such a device is as follows.

First, the PVC connection is established between subscribers through the crossbar switch board 440 at the operation terminal of the main processor module 410 (1).

The PC 450 or the terminal generates a test ATM cell and transmits the generated ATM cell to the cell path test board 461 through serial communication (eg, RS232C) (2).

The cell path test board 461 transmits the test cell to the ATM physical layer matching board 462 (3).

The ATM physical layer matching board 462 converts the test cell into the STM-1 (synchronous transmission module) physical layer and transmits the test cell to the subscriber matching board (BAIA) (4).

The subscriber matching board (BAIA) converts the test cell back into a cell of the ATM layer and transfers the test cell to the ATM layer processing board (HALA) 431A in a UTOPIA2 (Universal Test and Operations Physical Interface for ATM level 2) scheme (5).

The ATM layer processing board 431A transmits to another ATM layer processing board 431B via a switch through a PVC connection preset (6).

The ATM layer processing board 431B receiving the test cell transmits the test cell to the ATM layer processing board 431A side through the subscriber matching board BAIA connected with the loopback cable (7).

The ATM layer processing board 431A receiving the loopback test cell transmits the data back to the cell path test board 461 via the subscriber matching board (BAIA) and the ATM physical layer matching board 462 (8).

The cell path test board 461 receiving the test cell compares the transmitted cell with the received cell, detects cell loss and cell count, and reports the cell loss to the PC 450 or the terminal (or operating terminal) through serial communication.

As described above, in the present embodiment, when the cell path test is performed toward the switch board, the cell path test board 461 is replaced by the low speed subscriber control board 424, and the test cell is transmitted and received, and cell loss and cell count are operated. Report to the terminal. Therefore, it is not necessary to operate a separate test equipment as in the prior art, it is easy to test the cell path by replacing one board.

The embodiments described above fall within the scope of various changes, modifications, and equivalents of the present invention. Therefore, the present invention is not limited to the description of the embodiments.

According to the cell path test apparatus of the asynchronous transfer mode switch of the present invention, when the cell path test board is mounted at a position connected to the ATM physical layer matching board, the ATM physical layer matching board, the subscriber matching board, the ATM layer processing board, By verifying the cell paths in the system, which consists of many boards such as I / O buffers and port-connected switch boards and cross-bar switch boards, the use of measurement equipment is reduced and system reliability is improved.

Claims (2)

A processor module for establishing a permanent virtual line connection between subscribers through a switching means in a cell path test; A low speed subscriber matching module for matching up and down ATM cells to subscribers and having a cell path tester for transmitting and receiving test cells; A high speed subscriber matching module for transmitting a test cell transmitted from the low speed subscriber matching module to a switching means through a permanent virtual line connection established by the processor module, and looping back a test cell received from the permanent virtual line; And switching means for routing ATM cells between the fast and slow subscriber matching modules. The method of claim 1, The cell path test unit replaces the low speed subscriber control board during cell path testing, receives a test cell from the outside, and transmits the test cell to the fast subscriber matching module via an ATM physical layer matching board, and is received from the fast subscriber matching module. And a test cell is received through the ATM physical layer matching board.