Method for preventing defect transparent transmission of section layer of synchronous digital hierarchy equipment

Abstract

The invention discloses a method for preventing the defect transparent transmission of a section layer of synchronous digital hierarchy equipment, which relates to the technical field of synchronous digital transmission. The method comprises the following steps of: detecting a main service data frame of a service data interface, jointed with a crossing unit, on the optical interface unit system side of the synchronous digital hierarchy (SDH) equipment in real time, and judging the main service data frame gives an out of frame (OOF) alarm or not; when the main service data frame is judged to give the OOF alarm, inserting an administrative unit-alarm indication signal (AU-AIS) in the direction of the optical interface unit line side of the SDH equipment; and when the AU-AIS passes through the optical interface unit line side of the SDH equipment, performing scrambler processing and downwards transmitting the processed AU-AIS. By the method, clock abnormities can be prevented from causing the defects of error codes, alarm and the like of the section layer comprising a regenerator section and / or a multiplexing section at each downstream site, so the security of services of sites non-adjacent to a failing site is greatly improved.

Description

technical field [0001] The invention relates to the technical field of synchronous digital transmission, in particular to a method for preventing transparent transmission of segment layer defects of synchronous digital system equipment. Background technique [0002] In SDH (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy), the data frame is logically divided into three levels: regeneration section, multiplexing section, and high-order channel layer. Among them, the regeneration section and multiplexing section are overhead bytes, and the regeneration section overhead and multiplex section overhead can be classified as section overhead, which is mainly used to maintain the normal operation of the system, ring network or chain, while the high-order channel layer is mainly composed of high-order channel overhead and business data to be transmitted. Under normal circumstances, segment overhead exists only at adjacent sites. For example, if segment overhead occurs at...

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Problems solved by technology

By analogy, the decoding and scrambling processing of the remote site will continue to pass the long "0" or long "1" down, resulting in transparent transmission of segment layer defects

[0006] To sum up, in practical engineering applications, when some specific faults occur at a certain site, the segment-layer defect transparent transmission phenomenon of the synchronous digital system SDH equipment makes the service security of the site not adjacent to the faulty site Therefore, how to prevent the transparent transmission of segment layer defects of SDH equipment in the synchronous digital system has become an urgent technical problem to be solved in the field of synchronous digital transmission technology

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