Method and system for realizing high-order and low-order hybrid crossing of SDH based on FPGA

Abstract

The invention discloses a method and system for realizing SDH high-low order mixed crossover based on FPGA. The access data first finds the frame header of SDH through the frame header recovery module and restores the frame structure; the data finds the high and low order pointers of SDH through the high and low order pointer adjustment module and restores the high and low order time slots; the data is copied twice respectively Processing is carried out through high and low order processing branches; the control module generates cross instructions, controls the high and low order cross modules to perform cross exchange of corresponding data, controls the high and low order selection modules to select and switch data, and realizes the convergence and reorganization of high and low order data. The present invention realizes simultaneous access and processing of high and low order mixed data and arbitrary cross exchange, and the final output data is arbitrary high and low order mixed data, which solves the problem that high and low order data in traditional cross can only be processed separately, making access, Interleaving is more flexible, and the implementation cost is saved by combining the high and low order processing methods compared with separate processing methods.

Description

technical field [0001] The invention relates to the communication field, and relates to an FPGA-based method and system for realizing SDH high-low order mixed crossover. It specifically involves the pointer analysis and adjustment technology, high-order and low-order crossover technology, screening and reorganization technology of Synchronous Digital Hierarchy (SDH). Background technique [0002] Synchronous Digital Hierarchy (SDH) is widely used in optical fiber communication, including backbone network, metropolitan area network and access network. With the continuous growth of business volume and business types, when access data is cross-switched, it is necessary to deal with the problem of dealing with high-order and low-order time slots separately, and high-order time slots and low-order time slots are often in the Mixed coexistence in the same channel, the traditional processing method is to separate high-order and low-order data to different devices or boards for pro...

AI Technical Summary

Problems solved by technology

With the continuous growth of business volume and business types, when access data is cross-switched, it is necessary to deal with the problem of dealing with high-order and low-order time slots separately, and high-order time slots and low-order time slots are often in the Mixed coexistence in the same channel, the traditional processing method is to separate high-order and low-order data to different devices or boards for processing separately, which is not flexible enough and the cost is high, so there is a need for a method that can simultaneously process high- and low-order data Any mix of access data

Images