省级电力调度数据网设计中若干问题的探讨

对电力调度数据网设计组网中的网络技术体制、网络拓扑结构、路由协议和分区、网络设计指标等问题进行探讨。     

SDH在上海电网通讯传输网中的应用

介绍了上海电网通讯传输网现状和应用ＳＤＨ的优点，提出并分析了用ＳＤＨ组网和引进设备中应考虑的问题。     

基于PDH(Pound-Drever-Hall)技术谐振腔腔长反馈锁定研究

设计并搭建了一套基于PDH技术谐振腔腔长反馈锁定实验系统,利用高频率稳定度的激光中心频率作为参考标准实现对外部谐振腔腔长的精确控制.当入射光为1W,波长1064 nm,相位调制信号频率12.5 MHz,幅值2V,谐振腔输入耦合镜反射系数为0.95时,获得PDH误差信号随谐振腔腔长变化曲线与理论计算结果基本吻合.利用该误差信号实现了对外部谐振腔腔长大于30分钟,且稳定度为5.13×10-8的锁定.     

采用新一代光传输设备建设大客户接入精品网络

首先详细分析了传统采用PDH设备组建大客户接入网络的不足,然后列出采用SDH后的新一代光传输设备组建接入网络的优点,为运营商在建设接入网时提供了参考依据。     

基于Windows 2000的异常入侵检测主机特征研究

异常检测很重要的一步就是输入数据的提取,本文设计了18项Windows2000环境下的主机特征,并且实现了特征数据提取,可以为异常检测的各种智能方法提供训练数据和实时的检测数据。     

有关PDH／SDH混合传输网监控系统向TMN过渡的几点考虑

本文介绍了ＳＤＨ，ＰＤＨ监控系统的概况，讨论了传输网（长途传输网）中的ＰＤＨ／ＳＤＨ在混合状况下的管理监控问题，并提出了一些补救措施及方案，便于顺利实现向电信管理网ＴＭＮ的过渡。     

PDH通信二次群复接器在CPLD中的实现

简要介绍了准同步二灰群复接的基本原理，分析了正码速调整的基本原理及所涉及的一般问题，在此基础上，用VHDL语言对准同步复接电路进行全数字化描述，并在Max＋Plus Ⅱ环境中进行编译和仿真，得到了理想的结果，实现了基群速率2048kb／s的数字信号准同步通信二次群的复接器，其主要功能是在复接端将4个支路的2048kb／s数据通过正码速调整技术，合路成1路8448kb／s的高速数据流，由仿真结果可以看出系统的设计与理论值相符。     

多业务接入平台技术介绍

介绍了多业务接入平台（MSAP）技术背景,并对MSAP网络位置和系统组成、功能和协议、网络管理、产品形态以及MSAP与MSTP的不同进行了分析,最后对MSAP组网应用进行了阐述。     

浅谈对模拟微波网络的数字改造

介绍我省模拟微波网络SDH数字微波改造和PDH数字微波改造方案。     

Optimisation and performance assessment of a digital signal-processing method for jitter measurement in PDH/SDH-based digital telecommunication networks

The paper deals with jitter measurement in telecommunication networks based on plesiochronous (PDH) or synchronous (SDH) digital hierarchies. The attention is mostly focused on PDH/SDH analysers compliant to the ITU-T recommendations, the accuracy of which seems to be unsatisfying for both designers and manufacturers. Trying to give an answer to this problem, a digital signal-processing method was already proposed by the author. It succeeded in improving jitter measurement accuracy by avoiding the use of timing recovery circuitry, always needed, on the contrary, in the aforementioned analysers.The method is here optimised with the aim both of automating jitter performance test of network elements that operate at the PDH bit rate of 140 Mbit/s and the SDH bit rate of 155 Mbit/s, and further enhancing the accuracy on jitter estimates. In particular, an innovative procedure for automatically recovering the binary information conveyed by the jittered signal under analysis is introduced, and a proper strategy for carrying out instantaneous jitter measurements at uniform time intervals is developed.After a brief outline of the old version of the method, the proposed enhancements are described in detail. Then, the performance of the optimised method is assessed through many laboratory tests on emulated signals, the results of which are given and discussed. At the end, the outcomes of real automatic tests, conducted on PDH/SDH-based equipment produced by Marconi Sud S.p.A., are also presented.