带交换功能远程用户接入技术

【作者】 张毅；

【导师】 周亮；

【作者基本信息】 电子科技大学 ， 电子与通信工程， 2010， 硕士

【摘要】 随着程控交换机应用的普及,它已成为现代通信网的重要组成部分,程控交换的用户接入方式,也已随着技术的发展和应用需求的推动,呈现出了形式多样的变化。远程用户接入设备,是程控交换机的一种用户放号设备,它本身带交换功能,通过E1中继或SDSL远传接口接入上级程控交换机,实现程控交换机模拟、数字及保密用户的远程放号。本文完成了远程用户接入设备交换控制、中继接口、远传接口等关键部件硬件电路和控制软件的设计与实现,该设备能够不通过上级交换机,直接实现本地模拟、数字用户的交换,同时也能够根据用户的出局需求,实现本地用户和上级交换机或其他局用户的互通。本文主要是根据远程用户接入设备的主要性能特点和技术指标,规划了小型化、可搬移的总体设计方案,确定了电磁兼容设计及可靠性设计方案,划分了各部分功能模块,确定了各个模块的实施方案、电路组成及所需的主要器件,实现了交换控制模块、El中继模块、远传接口模块等硬件的设计,并在此基础上完成交换控制板、E1中继板、SDSL远传接口板的PCB板的制作、硬件的调试工作；软件方面参与软件功能及模块设计。通过搭建功能及可靠性测试环境,在系统内对整机进行功能及可靠性测试；通过在专业电磁兼容实验室进行电磁兼容试验,验证了设计和实现的正确性。本文所设计完成的远程用户接入设备最终将应用到实际的程控通信网中,作为程控交换机远程用户接入的一种补充,发挥其应有的作用。更多还原

【Abstract】 As the program controlled switch popularizes, it has become a major component of modern communication networks. And the subscribers’access fashion, with the development of techniques and the urgency of application requirements, has shown diverse changes. The Remote Subscriber Access Unit(RSU) is such a particular subscriber access device that it has switching ability, connects to the upper level switch via E1 or SDSL, and provides access for analogue, digital and secured subscribers. The RSU supports direct calls between local subscribers without any participation of the upper level switch, as well as it supports calls with subscribers from the upper level or other bureaus.This Thesis, based on the performance characteristics and technical specifications, illustrates a complete solution to the RSU, including the following aspects: miniaturization, portability, EMC, reliability, hardware module division, board-level schematic and pcb design, hardware debugging, software function definition, device-level function test, reliability test and EMC test etc. The RSU will eventually play an active part in practical program controlled switch communication networks, as a supplement to the remote subscriber access.更多还原