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Method for nondestructive switch of synchronous digital hierarchy service bus

A technology of synchronous digital system and bus switching, applied in time-division multiplexing systems, electrical components, multiplexing communications, etc. Eliminate the influence of time delay and phase difference, and ensure the effect of integrity

Active Publication Date: 2008-10-01
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Method for nondestructive switch of synchronous digital hierarchy service bus
  • Method for nondestructive switch of synchronous digital hierarchy service bus
  • Method for nondestructive switch of synchronous digital hierarchy service bus

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Embodiment Construction

[0042] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0043] figure 2 It is a schematic diagram of the process of lossless switching of the service bus for the line card service processing board of the SDH transmission system in the embodiment of the present invention, as shown in figure 2 As shown, the basic train of thought of the present invention is: at first, set FIFO register in SDH transmission system, then input the business bus signal that 2N routing cross board sends into FIFO register and carry out alignment process, to eliminate time delay and phase difference influence, and then determine the timing of bus switching after the selection of the main and backup buses by the service selection unit, and then send the service bus data after the selection of the main and backup buses to the service processing unit for processing such as framing and b...

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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...

Claims

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Application Information

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IPC IPC(8): H04J3/08
Inventor 彭祥吉
Owner ZTE CORP
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