Method and system for realizing service cross

Abstract

The invention discloses a method for realizing service crossover. For a management unit (AU)-4 service frame prepared to perform branch unit (TU)-3 level service crossover, the method includes the following steps: a. Frame low-order path alignment (LOPA) processing; b. Copy the management unit pointer (AU-PTR) and high-order path monitoring overhead (POH) in the AU-4 service frame; c. Decompose the AU-4 service frame Byte interleaving and multiplexing is based on the AU-3 service frame to perform AU-3 level crossover, and then byte interleaving and multiplexing is AU-4 service frame structure; d. AU-4 after byte interleaving and multiplexing 4 service frames undergo AU-PTR restoration and high-order POH regeneration processing, and restore them to standard AU-4 service frames and output them. The invention also discloses a system for realizing service crossover. By adopting the method and the system of the invention, TU-3 level service scheduling can be realized in the high-order crossover matrix, and the low-order crossover capacity of the system can be enlarged.

Description

technical field [0001] The invention relates to Synchronous Digital Hierarchy (SDH) technology, in particular to a method and system for realizing service crossover in the SDH system. Background technique [0002] At present, with the development of science and technology, the amount of information transmission in modern communication systems is expanding rapidly in the form of acceleration. In this way, it is urgently required to increase the capacity of the transmission network and the ability of network elements to dispatch services. Among them, the SDH transmission system has been widely supported and applied for its unique synchronous multiplexing and mapping methods, horizontal compatibility of interfaces, and powerful management and maintenance capabilities. [0003] The so-called SDH transmission system is composed of SDH network units, a network that performs synchronous information transmission, multiplexing and cross-connection on optical fibers. In particular, ...

AI Technical Summary

Problems solved by technology

When the demand for TU-3 crossover increases, the actual expansion is the crossover capability of TU-12, which increases the complexity of realizing large-scale TU-3 level crossover

Moreover, both TU-3 and TU-12-level cross-connect services will occupy the channels of the high-order cross-connect matrix, which will not only greatly limit the system's scheduling capacity for TU-3 services, but also make the AU-4-level high-order Business access ability is affected

Therefore, the existing high- and low-order service crossover implementation schemes cannot meet the service scheduling requirements of current and future SDH transmission systems at low cost and efficiently

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