Soluting method for protection of loop fault of optical transmission network by four fiber complex section sharing

Abstract

A solving method of 4 fibre Multiplex Section Shared Protection Rings fault in optical transmission network. It concerns with following field; 1. appoints certain transmission channel and transmit echo signaling. 2. The net element which is received order that commands PS-R ring inverting the instruction of administration of networks sends the corresponding net elemtn request signaling; after the corresponding net element receives the requests, returns the responses signaling; The net element that neither receives order from administration of networks nor receives request signaling send close-in net element a default signaling. 3. judge transmit net element whether receives PS_R ring inverting the instruction of administration of networks at direction 1 or 2; if it is received then send close-in net element request signaling that corresponds to FS-R; if not enter 4.

Description

technical field [0001] The invention relates to the field of optical transmission, in particular to a fault-solving technology for shared protection rings of four-fiber multiplexing sections of an optical transmission network. Background technique [0002] Multiplex section protection switching is an important method to quickly restore services after a fault occurs in a high-speed optical transmission ring network. The most important module signal in the SDH signal system is the synchronous transfer mode (STM-1), and its rate is 155.52Mbit / s. The higher-level transmission rate of the transmission network is the result of multiplexing the STM-1 signal. The first 81 bytes of the STM-1 signal are defined as section overhead bytes (among them, the first 27 bytes are called regeneration section overhead bytes, and the last 45 bytes are called multiplex section overhead bytes), among which the multiplex Section overhead bytes K1 and K2 are used to transmit multiplex section prot...

AI Technical Summary

Problems solved by technology

[0012] Question 1: Since network elements A and B have always maintained FS_R-level ring bridge switching, if the working optical fiber of any span on the transmission ring network fails at this time, since the ring switching level of FS_R level is higher than that of the signal failure_span (SF_S) span The segment switching level is high, and the two NEs with faulty working fibers will not be able to start SF_S inter-segment switching to restore services

As a result, services between NEs on the ring network will be interrupted, and the consequences will be extremely serious.

[0013] Question 2. The network management layer is the control layer for the staff on the transmission ring network

At this time, the network management layer has revoked the FS_R network management command of network element A in the A-B direction, but the device layer still maintains the FS_R ring switching. The state of the network management layer and the device layer are inconsistent, which may easily cause misunderstandings and other misoperations by the staff.

[0014] Phenomenon 2: For manual switching_ring (MS_R) network management commands and practice switching_ring (EXE_R) network management commands, due to their low protection level, problem 1 will not occur, but the phenomenon described in problem 2 still exists

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