Method for nondestructive switch of synchronous digital hierarchy service bus

Abstract

The invention discloses a business bus lossless switching method in synchronous digital hierarchy (SDH). The method includes: a. a main / spare cross board transmits business signal of a plurality of channels into a line card business processing board; b. the line card business processing board extracts clock, or frame head (FR), or payload indicator (PL) in business signal, and business data enters FIFO cache under action of the indicator signal and clock signal; c. the line card business processing board realizes data alignment in FIFO cache under action of uniform clock and FR, then, parallel transmits to a bus switch controller; d. the bus controller selects frame head A1A2 byte position, or leisure spending position in SDH frame structure, or pointer byte position in administrative unit (AU) for processing business bus switching. The business bus lossless switching method can eliminate time delay and phase separation when business bus switching, and increase SDH business protection reliability.

Description

technical field [0001] The invention relates to a service bus switching technology in a Synchronous Digital Hierarchy (SDH) transmission system, in particular to a method for lossless switching of an SDH service bus. Background technique [0002] At present, with the wide application of SDH transmission technology, the ability of the optical transmission system to carry communication services is becoming more and more powerful. In order to prevent service interruption or damage in the SDH transmission system, people have adopted various protection measures for the SDH transmission system, such as : adopting link protection or multiplex section protection in the network networking mode of the SDH transmission system, adopting 1+1 or 1:N single-board protection in the SDH transmission system, etc. [0003] Specifically, in the single-board protection mode, a system architecture such as a backplane plus a line card service processing board is usually used in the SDH transmissio...

AI Technical Summary

Problems solved by technology

During the process of service bus switching, the main reason for the transient service interruption phenomenon is that there are differences in the equipment backplane and board wiring of the existing SDH transmission system. When several cross-connect boards with 1+1 or 1:N hot There is a certain delay and phase difference when the signal reaches the line card service processing board

However, it is unrealistic and impossible to eliminate this time delay and phase difference by changing the way of wiring.

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