Abnormal restoring method of multiplex section protection exchanging

Abstract

This invention discloses a resume method for the inversion abnormal protection of a multiplex segment by carrying out simple check process of automatic resuming to reach the aim of protecting service, which realizes simple inquiry and response system by the relation of the node label number so as to check the consistency of the state of two adjacent nodes in the inversion segment on the multiplex segment ring and to judge the situation of the oscillation of the protocol in the process to test the abnormal situation of the protection inversion of the multiplex segment and applies the total ring start-stop method to resume it to the normal state automatically.

Description

technical field [0001] The invention relates to a multiplexing section protection switching method of a transmission system, in particular to an abnormal recovery method of the multiplexing section protection switching. Background technique [0002] One of the important reasons why Synchronous Digital Hierarchy ("SDH") technology can achieve rapid development and be widely used, and can be adopted as a middle layer protocol in optical transmission systems is its self-healing protection function. In various networking protections, multiplex section protection (Multiplex Section Protection, referred to as "MSP") is an efficient protection means, and is also one of the most important protection means in today's optical transmission systems. [0003] In its G.841 recommendation, the International Telecommunication Union-Telecommunication Standardization Sector (International Telecommunication Union-Telecommunication Standardization Sector, referred to as "ITU-T") clearly defined...

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Problems solved by technology

[0009] This method involves DCC channel communication, and the communication protocol needs to be defined, and the algorithm processing is relatively complicated

Since this method requires each node to verify the state, request, etc., it essentially runs the protocol twice and verifies it by comparing the results of the two protocol operations, which is less efficient

Moreover, since the verification is realized by directly modifying the status and alarm of the multiplex section protocol, the increase in the number of times the protocol runs will increase the probability of verification failure

In addition, because DCC communication is not connection-oriented, its reliability cannot be guaranteed. However, this method uses timing processing. If the consistency and order of DCC communication are not guaranteed, it is easy to cause verification due to DCC communication problems. error, which will also reduce the efficiency of the verification

In fact, most of the time this method only provides alarm measures when the verification error occurs, and cannot recover the abnormal situation, and when there are too many alarms due to the above reasons, the method will be unavailable

However, in the actual situation, when the alarm is received, the multiplex section switching has failed, and the service has been lost, which cannot solve the abnormal recovery problem of the multiplex section protection switching

[0010] In practical application, the above scheme has the following problems: it cannot be automatically restored in the case of abnormal multiplex section protection switching, and the algorithm processing is complicated, and the verification efficiency is low

[0011] The main reason for this situation is that most of the prior art solutions only report alarms when the verification fails, and do not take any recovery measures. When using the DCC channel for communication, complex The protocol processing process leads to low verification efficiency. In addition, directly modifying the attributes of the protocol and using the second protocol to verify the operation of the first protocol can easily lead to new problems.

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