Design & Realization Of Access Network System In SDH Private Communication Network

Embedded Access Network development based on Real-Time Operating System is a promising area and has far-reaching theory research and practical application value. The background about embedded access network interface protocol research and design of the Melit 2.5G optical integrated services transmission network are put forward in this article. Thus the collection ability of analog telephone users and ISDN users will be improved. So the research mainly concentrated on the following aspects: Analyse the current problems of Melit system solution, put forward a new V5 solution, then compare; Study the embedded systematic framework and real-time operating system; Analyse the interface communication protocol of access network deeply; Discuss the key technology and the realization of V5 interface system; Dissertate the classification test of V5 interface system, analyse and summarize the testing results.This article firstly introduces the embedded system and its framework, investigates the design methodology of Nucleus embedded system and studies the structure of V5 protocol deeply.Secondly, the key technology of the access network V5 interface system is based on communication FSM, and uses a suit of carefully designed data structures, the mechanisms of systematic task division, the message transmission mechanisms, the management mechanisms, and multi-timer support as the key technology of V5 interface. According to the project of systematic modules division, embedded V5 interface that is based on Nucleus PLUS becomes realized. Simultaneity SDH main structure is simply introduced, FXO∕FXS hardware structure and ISDN interface module design are also discussed to a certainty.To ensure the performance between the local digital switch and access network equipment, it is necessary to test the consistency and interoperability of V5 protocol interface equipment. According to the norms of detailed testing, V5 interface equipment, network protocol testing, performance testing and functional testing should be accomplished step by step. In the following, the author analyzes the problems and summarizes the result after a series of testing.Finally, the whole article is summed up and the further work by the author is issued and the problems are made a better discussion.