KR20040059557A - Apparatus for port diagnostic of ATM interface card - Google Patents

Abstract

PURPOSE: A self-diagnostic apparatus for the ports of an ATM interface card is provided to execute self-diagnosis for the ports of an ATM interface card in a global router/local router switch in a CDMA-2000 system. CONSTITUTION: A self-diagnostic apparatus for the ports of an ATM interface card consists of an ATM interface unit(110), a buffer(120), a switch card(130), an ATM cell loopback part(140), and a self-diagnostic part(150). The ATM interface unit(110) interfaces a cell to send. The buffer(120) executes buffering for the output cell of the ATM interface unit(110). The switch card(130) carries out switching for the output cell of the buffer(120). The ATM cell loopback part(140) loops back the ATM cell passed through the switch card(130), the buffer(120), and the ATM interface unit(110) in order. The self-diagnostic part(150) compares the loopbacked ATM cell, interfaced at the ATM interface unit(110), with the cell to send and diagnoses the port state of the ATM interface card.

Description

Apparatus for port diagnostic of ATM interface card

The present invention relates to a port self-diagnosis apparatus of an AMT interface card, and more particularly, to an ATM interface card in a global router / local router ATM switch (asynchronous transfer mode) of a CDMA-2000 system. The present invention relates to a port self-diagnosis apparatus of an AMT interface card capable of self-diagnosing a port of a SOLA.

In the past, an ATM cell protocol generator was connected directly to a port to diagnose the port by sending and receiving cells.

However, this method is only possible off-line, and it is impossible to diagnose specific ports on the ATM itself on-line, and the ATM switch itself without ATM cell protocol generation equipment. Diagnosis was not possible.

Therefore, the present invention enables self-port diagnostics independently of ATM interface cards in ATM switches, and enables port self-diagnosis on-line using port duplication.

An object of the present invention is to provide a port self-diagnosis apparatus for an ATM interface card capable of self-diagnosing a port of an ATM interface card (SOLA) in a global router / local router ATM switch of a CDMA-2000 system. There is.

The present invention for achieving the above object,

For port self-diagnosis, the serial self-diagnostic loopback function of the ATM cell loopback unit (PMC5349), a physical layer processing chip, is used. The port self-diagnosis function transfers user data to the corresponding port. When exported, it can be looped back from the PMC5349 and returned by receiving user data. For this purpose, the processing function of the 860 disassembly and assembly processor (SAR Processor) capable of processing AAL 5 layer is used.

In addition, port diagnostics are performed on the standby link in a redundant link (active / standby) to perform port diagnostics on-line, and input cell blocking of each port of the PMC5349 to diagnose ports on the standby link. cell blocking) function was used.

1 is a block diagram showing the configuration of a port self-diagnosis apparatus of the AMT interface card according to the present invention.

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

110 ..... ATM Interface

120 ..... Buffer

130 ..... Switch Card

140 ..... ATM Cell Loopback

150 ..... Self Diagnosis

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

1 is a block diagram showing the configuration of a port self-diagnosis apparatus of the AMT interface card according to the present invention.

As shown therein, an ATM interface 110 for interfacing a cell to be transmitted, a buffer 120 for buffering an output cell of the ATM interface 110, and a switch for switching an output cell of the buffer 120. An ATM cell loopback unit 140 for looping back an ATM cell that has passed through the card 130, the switch card 130, the buffer 120, and the ATM interface 110, and the ATM interface 110. The self-diagnostic unit 150 receives a loopbacked ATM interfaced at and transmits a self-diagnostic state of a port of an ATM interface card in comparison with a cell to be initially transmitted.

Referring to the operation of the port self-diagnosis apparatus of the AMT interface card according to the present invention configured as described above are as follows.

First, the ATM cell loopback unit (PMC5349) 140 is a chip for processing a physical layer, and may be regarded as the last interface just before exiting to an external optical port.

Therefore, the PMC5349 implements the port diagnostic function by looping back the cell to diagnose the port on its own. Setting the port you want to diagnose to the PMC5349's serial diagnostic loopback mode allows the cell to loop back from the PMC5349.

However, the serial self-diagnostic loopback mode loops back at the PMC5349 self-diagnostic loopback point without leaving the cell, so there is a limitation that the incoming input cell is lost for that port. Therefore, if the diagnostic using the serial diagnostic loopback function is performed on a port that is currently active (operating port), all the input cells from the outside are discarded during the diagnosis. .

Next, the user data may be converted into a cell using a segmentation and reassembly (SAR) function of the self-diagnostic unit 150 (860-SAR processor), and the cell may be converted into user data. Function must be supported. Using this function, the AP can generate and cellize the data and convert the cell looped back from the PMC5349 back to user data.

The cells of the active port are accepted and the cells of the standby port are discarded without using the PMC5349's port-by-port input blocking function. This allows the receiving cell to accept only the active port, then copy it from the switch card to the active / standby port simultaneously. That is, accommodating the receiving input cell is performed only at the active port, while exporting the transmit output cell (tx output cell) is performed at the active / standby port at the same time.

As described above, if PMC5349 serial self-diagnostic loopback function is used, the receiving cell is lost, so it is not possible on-line, but in ASB system, since the port is redundant, if the diagnostic function is performed on the standby port, Line port diagnostics are possible.

The standby port only needs to maintain the receiving input cell in a non-receiving state, so that the receiving input cell is not received even in the serial self-diagnostic loopback mode. Therefore, even if the corresponding port of the PMC5349 chip is set to the diagnostic loopback mode and the blocking state of the port is released, the receiving input cell does not come in, so the ASB chapter can maintain the same state as the input cell blocking state. .

In this case, the reason for releasing the input cell blocking state from the standby port and diagnosing the port is that in the blocking state, the cell is looped back from the PMC5349 and is not returned. Therefore, the PMC5349 blocking function should be temporarily disabled on the standby port, the port diagnostics performed, the PMC5349 blocking function set again, and the PMC5349 serial self-diagnostic loopback function disabled.

The cell flow for port self-diagnostics is 860 SAR (AAL 5 interface) (150 SAR)-ATM interface (PMC atlas) (110)-buffer (abm) (120)-switch card (acsa) (130)-buffer (abm) (120) -atminterface (pmc atlas) (110) -serial diagnostic loopback point (PMC5349) (140) -ATM interface (PMC atlas) (110) -860 in order of AAL 5 interface (SAR) 150 Cells for port diagnosis are transmitted and received.

This procedure performs the diagnostic function. The AP diagnoses the port state as a normal state if a cell is received before timeout after performing the port state and the received data is not lost compared to the transmitted data.

If the cell is not received until timeout or if the received data is lost compared to the transmission, the port is diagnosed as abnormal.

As described above, when the port diagnosis is performed, two conditions must be satisfied to ensure the reliability of the result.

First, the switch card should be in a working condition. Secondly, it must have a predetermined path so that the cell can flow along the path as is well known. If these two conditions are met, the result of port diagnosis can be guaranteed reliability.

After port diagnostics, the PMC5349 serial self-diagnostic loopback mode must be released and the PMC5349 port blocked. If you want to diagnose the active port, you need to switch the active / standby port to make it standby.

Next, the port self-diagnosis process in the off-line is as follows.

The port self-diagnosis on off-line is the same as the port self-diagnosis process in the on-line state described above except for the PMC 5349 port deblocking / setting procedure.

The off-line loss of external input cells makes no sense, so the PMC 5349 port does not have to be blocked. The criteria for determining port status diagnosis are also the same as the on-line method described above.

According to the present invention described above, the existing ATM interface card port diagnosis was possible only off-line, and also the interface with a target system (additionally required equipment such as ATM cell protocol generator) or connected to the port Although it was absolutely necessary, the present invention has the effect of enabling the port diagnosis independently without the interface with the target node as well as the on-line test by the invention of the port self-diagnosis function of the ATM interface card.

Claims (1)

In the port diagnostic apparatus of the ATM interface card, An ATM interface for interfacing a cell to be transmitted; A buffer buffering an output cell of the ATM interface; A switch card for switching the output cells of the buffer; An ATM cell loopback unit for looping back an ATM cell passing through the switch card, a buffer, and an ATM interface device in sequence; Port self-diagnostic apparatus for ATM interface card comprising a self-diagnostic unit for receiving a loopback ATM cell interfaced by the ATM interface, and self-diagnosing the port state of the ATM interface card compared to the first cell to be transmitted. .