光纤／同轴电缆混合网的发展

光纤／同轴电缆混合网的发展王啸山在整个“八五”期间，邮电通信业高速发展，长途通信基本实现数字化大通道以光缆为主的传输方式。目前正大力建设ＳＤＨ系统，以替代原有的ＰＤＨ系统。在交换上实现了一步到位的数字程控交换。总之在长途传输、市话交换等方面的飞速发展...     

光纤线路故障的检测

近几年 ,由于光电技术性能的优越及其相关产品价格的逐渐降低 ,大量光缆及光传输设备用于干线光缆传输网和ＨＦＣ有线电视网。光缆传输网具有较高的稳定性和可靠性 ,相对电缆网大大减轻了工程技术人员的维护强度。但是 ,在光缆网的建设和运营中也会有各种各样的故障发生 ,掌握光电传输技术及相关仪表的使用 ,对于迅速排除故障 ,提高网络运营可靠性 ,是非常有益的。目前 ,根据传输设备的不同 ,光纤线路在光传输网络中主要有两种应用 :一种为数字传输 ,有ＰＤＨ和ＳＤＨ两种制式。ＰＤＨ目前较少用于电视传输 ,而较多用于数据传输 ,ＳＤＨ多用…     

光纤线路故障的检测

近几年 ,由于光电产品价格的逐渐降低及其技术性能的优越 ,大量光缆及光传输设备用于干线光缆传输网、ＨＦＣ有线电视网。由于光缆传输网有着较高的稳定性和可靠性 ,相对电缆网大大减轻了工程技术人员的维护强度。但是 ,在光缆网的建设和运营中也会有各种各样的故障发生 ,掌握光电传输技术及相关仪表的使用 ,对于迅速排除故障 ,提高网络运营可靠性 ,是非常有益的。目前 ,根据传输设备的不同 ,光纤线路在光传输网络主要有两种应用 :一种为数字传输 ,一般为ＰＤＨ ,ＳＤＨ制式 ,ＰＤＨ目前较少用于电视传输 ,而较多用于数据传输 ,ＳＤＨ多用于…     

“九五”新建光缆工程动态

“九五”新建光缆工程动态据悉，我国在九五期间拟新建的光缆干线工程和光缆扩容工程准备采用速率以２．５Ｇｂ／ｓ为主的ＳＤＨ系统，同时，为符合我国“信息高速公路”的要求，正着手“ＳＤＨ光纤传输网”的规划设计，以便使我国迄今为止仍是点对点的传输系统进入独立成...     

中国光纤通信网的发展及市场

９０年代以来,中国电信事业发展迅速,成就卓然。文中阐述了光缆建设,光缆通信设备建设,光纤传输网体系及全光网发展的前景,并对光缆,光纤,ＳＤＨ设备及光连接器等市场进行了估测。     

河南省二级光缆干线SDH传输网的建设与发展

河南省二级光缆干线ＳＤＨ传输网工程于１９９４年立项,１９９６年３月开始施工,１９９６年底投入试运行,１９９７年７月竣工投产。随着电信业务的迅速发展,省邮电部门在１９９７年底对网络进行了紧急扩容,１９９８年初开始对网络进行优化。１河南省二级光缆干线ＳＤＨ传输网的组建１．１网络建设背景河南省二级光缆干线ＳＤＨ传输网是从１９９４年开始立项建设。当时全国光缆通信网建设刚刚开始引用ＳＤＨ光同步数字传输技术,通信进入大发展时期;以ＰＤＨ系列为主体的长途二级光缆干线传输网及中继网己形成规模,光缆建设达５０００…     

试谈本地网传输系统的规划和建设与SDH的采用

简介了以Ｃ３为基础的本地电话网传输系统的星形网络和现有网络的不足之处，并说明传输系统的规划和建设是实现本地电话网的核心；指出了准同步数字系列（ＰＤＨ）的弱点和同步数字系列能满足的性能，以及ＳＤＨ设备（交换、传输和接入设备）的现状；阐述了本地网的规划应考虑采用ＳＤＨ，以及采用ＳＤＨ构成本地网的几种形式。     

SDH技术在广播电视省级干线网中的应用

介绍ＳＤＨ技术传输原理、ＳＤＨ传输广播电视信号过程以及ＳＤＨ技术在江苏广电光缆网和国内省级广播电视传输网中的应用。     

LMDS新技术在广电系统的应用

１ 引言：广电接入网的现状 随着广电系统光缆干线的建设并逐步投入使用,传输网络的数字化得以实现,使用多年的模拟微波传输线路逐渐“消隐”。光缆传输干线的庞大投资须得到回收。而传输网络投资回收很大程度上取决于接入网,但接入网目前的技术体制不能满足广大人民群众的需求,与网络的数字化要求还相差很远,就广电系统而言,也很难产生很好的经济效益和较大的社会效益。 目前广电系统接入网多采用ＨＦＣ、同轴网或ＭＭＤＳ。同轴Ｍ或ＭＭＤＳ的反向弊端自不必说,就新建的ＨＦＣ而言,大部分也不过是用光纤代替城区主干传输而已,其…     

SDH的测试

９０年代传输网正面临着从点到点通信的准同步数字传输体制（ＰＤＨ）向以光纤为主要传输媒质的同步数字传输网（ＳＤＨ／ＳＯＮＥＴ）体制的转变。ＳＤＨ网作为一种全新的电信传输体制，也为测试提出了新的课题。本文讨论了ＳＤＨ所特有的测试要求。     

Telecommunications

The telecommunications blueprint for a single Europe after 1992 is examined. This `green paper' is an ambitious three-year-old document in which the European Community's Commission calls for a Western-Europe-wide telecommunications infrastructure based on the integrated-services digital network (ISDN) and other digital communication links. The progress that has been made toward this goal is assessed, showing that progress toward opening national markets and establishing an infrastructure varies greatly from country to country. The highly variable quality of network services throughout Europe presents a further obstacle to unification. Nevertheless, the national segments of a trans-European ISDN system are beginning to emerge, and work on the specific technologies, standards, and regulations for cross-border telecommunications systems are advancing     

Telecommunications

The author presents a technological overview of the telecommunications field covering the topics of: European telecommunication authorities privatisation; mobile communications in Asia; fibre optic amplifiers; and cable TV integration with wireless technology     

Telecommunications

The author discusses advances and changes in: Internet; multichannel optical fibre networks using erbium-doped fibre amplifiers and wavelength division multiplexing; HDTV; digital radio; satellites for mobile voice telephony; the auction of wireless telephony licences; and unlicensed personal communication systems     

Telecommunications processors

Telecommunications controllers worldwide are becoming increasingly stored-program oriented. Electromechanical and electronic wired logic controllers lack the flexibility, maintainability, and (ultimately) the economy of stored program processors. While similar to commercial computers, most stored program telecommunications processors have features unique either in nature or degree of application. There also exists a remarkable variety of overall architectural features which are useful in telecommunications applications, and a similar variety of administrations and manufacturers willing to espouse them. Pertinent stored program processor architectural features are discussed as a dass, then extant and proposed processors are described and placed in perspective, Finally, likely future trends are discussed.     

Telecommunications numbering

Numbering volatility in telecommunications is a by-product of progress from a monopoly telephone service to the multiservice, open market of the 1990s and the next century. The last twenty years have seen much number changing activity, including the London code change of 1990. A national code change is scheduled for 1995. The paper presents an understanding of these developments, and investigates personal numbering, branding, portability, and other issues which will be topical throughout the rest of the decade     

Telecommunications in Indonesia

The telecommunications in Indonesia is reviewed with emphasis on transmission and switching networks. It is recognized that due to the geographical configuration of Indonesia, problems are created in the field of telecommunication that require special transmission consideration. The existing Perumtel's Transmission Network and Domestic Satellite Project Palapa 1 are discussed. The future expansion programs in transmission and switching are also briefly reviewed.     

Telecommunications in Lithuania

According to Lithuania's Master Plan, further development of the country's telecommunications infrastructure must be concentrated on modern digital technology, most of it produced in Western countries. The Master Plan is divided into three parts. First, it is a short term plan that covers the development of telecommunication systems with high priority, and covers the period through the end of 1997. Another goal stated in the Master Plan is to have 48 main lines per 100 inhabitants by the year 2005. In addition, the Ministry decided to issue one license for operating a national paging network in 1995. This network must cover most of Lithuania. The number of licenses for local paging networks will not be limited     

澳大利亚电信业的发展

对澳大利亚电信业发展的历史及现状，包括无线通信、有线通信及计算机通信等方面进行了介绍，对该国电信业未来发展的前景作了展望。