Apparatus and method for protecting 1: N disc of SDH business interface disc

Abstract

The invention relates to a protection device and a method for a SDH service interface disk 1: N disk; in addition to adopting a conventional alarm line to send the failure information of a tributary disk, a crossing disk is utilized to carry out the tributary pointer explanation to the upper voice data on a tributary, whether the pointer explanation is normal or not is taken as one of the judgement conditions of the failure of the service interface disk; in addition, all the service interface disks are utilized to carry out the tributary pointer explanation to the lower voice data from the crossing disk and feed back the pointer explanation result to the crossing disk by the alarm line. The crossing disk adopts the different response measures to the alarms which are collected by three routes of the tributary disk alarm line, the tributary upper voice data pointer explanation and the tributary lower voice data pointer explanation.

Description

technical field [0001] The present invention relates to optical communication equipment, in particular to a device and method for SDH (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy) service interface disk 1:N disk protection. Background technique [0002] In the SDH system, various service interface disks, such as 2Mb / s, 34Mb / s, 45Mb / s, 140Mb / s, Ethernet, etc., need to multiplex the service data to the SDH frame structure after mapping and positioning in the receiving direction Among them, the transmission through the SDH optical line is called the uplink (ADD); on the contrary, the data of a specific time slot is sent to the user interface through demultiplexing, positioning, and demapping from the SDH optical line data, which is called the downlink (ADD). DROP). The service interface board, that is, the tributary board, is connected to the cross board through the up and down data bus of the backplane on the system side, and connected to the user data port t...

AI Technical Summary

Problems solved by technology

[0005] 1. When the power supply of the branch board fails, the power output is at an uncertain level, which causes abnormal operation of the CPU and the interface chip, which affects the alarm line output to the cross board, and the cross board cannot correctly judge the working status of the branch board.

[0006] 2. When the CPU of the branch board starts or operates abnormally, since the failure is judged by the CPU, the failure of the CPU itself is not included in the failure detection range, so it cannot be reflected on the output alarm line of the branch board

[0007] 3. Due to the failure of the interface chip of the tributary disk, the interface chip of the cross-connect disk, or the backplane, etc., the transmission of voice data fails, and the tributary disk itself cannot be detected;

[0008] 4. Part of the circuit of the chip fails, but the registers are still read and written normally. It is not comprehensive to verify whether the chip is working normally only by reading and writing the registers.

[0009] To sum up, using conventional methods to detect tributary disk failures covers a limited range of failures. Under many failure conditions, the 1:N disk protection switching of tributary disks cannot be correctly triggered, resulting in interruption of user services.

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