SDH device, and method for protecting SDH service

Abstract

The invention specifically discloses an SDH device and an SDH service protection method thereof. Including steps: (1), adding a heartbeat loopback module in the service interface processing board, and selecting and controlling the output of the selection circuit by counting and generating an overflow signal through the counting comparison circuit in the heartbeat loopback module, and choosing to output the heartbeat signal or the fixed signal to the crossover (2) The cross-connect board judges whether the heartbeat signal sent back is consistent with the heartbeat signal sent, if not, execute step 3, otherwise send a new heartbeat byte, wait for the next execution cycle, and continue to execute step 2; (3) Execute the switching protection operation and end. According to the present invention, the real-time performance of single board abnormality detection can be improved, and when the working state of the single board is used as the switching condition, remote upgrade and reset of the single board service can be realized without interrupting the service, and the high-priority processing time due to ECC and the like can be avoided. Long-term and other reasons lead to false switching and other situations.

Description

technical field [0001] The invention relates to the field of optical transmission, in particular to a synchronous digital sequence SDH (Synchronous Digital Hierarchy) device and an SDH service protection method thereof. Background technique [0002] With the continuous development of the digital transmission system, the application of the SDH transmission system is becoming more and more extensive. In the current optical transmission equipment, many equipments provide different protection measures. For example, multiplex section protection and 1:N single board protection, the real-time and effectiveness of these protections are very important for SDH equipment. If the multiplex section protection or 1:N board protection is not real-time or cannot be protected in some cases, the transmission service is interrupted or the interruption time is too long, and the consequences are very serious. At present, various transmission equipment manufacturers have studied many methods in...

AI Technical Summary

Problems solved by technology

[0007] However, this software heartbeat method has gradually exposed many shortcomings in previous applications:

[0008] 1. Use software to process the heartbeat. Due to the limitation of software execution speed, the real-time performance of abnormal detection on the single board is poor.

[0009] 2. Since the optical board has to deal with higher priority tasks such as ECC and cannot update the heartbeat byte in real time, the cross-connect board will mistakenly think that the single board is abnormal and cause the wrong switching of the multiplex section

[0010] 3. At present, new functional requirements of SDH equipment emerge in an endless stream, such as remote upgrade, single board reset without error code and other functions. In order to realize these functions, it is necessary to ensure that the software heartbeat is normal during the execution of these processes, so as to prevent the instantaneous service interruption caused by cross-connect board switching , but the software cannot update the heartbeat bytes during these processes

[0011] Due to these defects, many devices even give up the working status of the single board as the condition for multiplex section switching, which undoubtedly weakens the self-healing ability of SDH equipment

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