电信专业英英词典P-2

　　PPSN

　　public packet switched network

　　Premises¹ Distribution System (PDS)

　　PDS is the transmission network inside a building or among a group of buildings, for example an office park or a campus. PDS is used in this book as a generic² term although AT&T used it to describe a specific product offering. The PDS connects desktop³ and other station equipment with common host equipment, (e.g., switches, computers and building automation systems), and to external telecommunications networks.

　　Private Branch Exchange (PBX)

　　A PBX is a premises switching system, serving a commercial or government organization, and usually located on that organization's premises. PBXs provide telecommunications services on the premises or campus, (e.g., internal calling and other services), and access to public and private telecommunications network services.

　　Private Network

　　A private network is a network made up of circuits and, sometimes, switching equipment, for the exclusive use of one organization.

　　PRI

　　primary rate interface⁴

　　Protocols⁵

　　Protocols are strict procedures for the initiation⁶, maintenance and termination of data communications. Protocols define the syntax (arrangements, formats⁷ and patterns of bits and bytes) and the semantics (system control, information context or meaning of patterns of bits or bytes) of exchanged data, as well as numerous other characteristics (data rates, timing⁸, etc.).

　　PSN

　　packet switched network

　　PSPDN

　　packet switched public data network

　　PSTN

　　public switched telecommunications network

　　PTT

　　postal⁹, telephone, and telegraph

　　Public Switched Telephone Network (PSTN)

　　A Public Switched Telephone Network (PSTN) denotes those portions of the LEC and IXC networks that provide public switched telephone network services.

　　PUC

　　public utility commission

　　Pulse Code Modulation¹⁰ (PCM)

　　Pulse Code Modulation (PCM) is a modulation scheme involving conversion¹¹ of a signal from analog¹² to digital form by means of coding. See also modulation.

1 premises   

n.建筑物，房屋

参考例句：

• According to the rules,no alcohol can be consumed on the premises.按照规定，场内不准饮酒。
• All repairs are done on the premises and not put out.全部修缮都在家里进行，不用送到外面去做。

2 generic   

adj.一般的，普通的，共有的

参考例句：

• I usually buy generic clothes instead of name brands.我通常买普通的衣服，不买名牌。
• The generic woman appears to have an extraordinary faculty for swallowing the individual.一般妇女在婚后似乎有特别突出的抑制个性的能力。

3 desktop   

n.桌面管理系统程序；台式

参考例句：

• My computer is a desktop computer of excellent quality.我的计算机是品质卓越的台式计算机。
• Do you know which one is better,a laptop or a desktop?你知道哪一种更好，笔记本还是台式机？

4 interface   

n.接合部位，分界面；v.(使)互相联系

参考例句：

• My computer has a network interface,which allows me to get to other computers.我的计算机有网络接口可以与其它计算机连在一起。
• This program has perspicuous interface and extensive application. 该程序界面明了，适用范围广。

5 protocols   

n.礼仪( protocol的名词复数 )；（外交条约的）草案；（数据传递的）协议；科学实验报告（或计划）

参考例句：

• There are also protocols on the testing of nuclear weapons. 也有关于核武器试验的协议。 来自辞典例句
• Hardware components and software design of network transport protocols are separately introduced. 介绍系统硬件组成及网络传输协议的软件设计。 来自互联网

6 initiation   

n.开始

参考例句：

• her initiation into the world of marketing 她的初次涉足营销界
• It was my initiation into the world of high fashion. 这是我初次涉足高级时装界。

7 formats   

n.（出版物的）版式( format的名词复数 )；[电视]电视节目的总安排（或计划）

参考例句：

• They are producing books in all kinds of different formats. 他们出版各种不同开本的书籍。 来自《简明英汉词典》
• A true GUI includes standard formats for representing text and graphics. 真正的图形用户界面包括表示文字和图形的标准格式。 来自互联网

8 timing   

n.时间安排，时间选择

参考例句：

• The timing of the meeting is not convenient.会议的时间安排不合适。
• The timing of our statement is very opportune.我们发表声明选择的时机很恰当。

9 postal   

adj.邮政的，邮局的

参考例句：

• A postal network now covers the whole country.邮路遍及全国。
• Remember to use postal code.勿忘使用邮政编码。

10 modulation   

n.调制

参考例句：

• The soft modulation of her voice soothed the infant. 她柔和的声调使婴儿安静了。
• Frequency modulation does not allow static to creep in. 频率调制不允许静电干扰混入。

11 conversion   

n.转化，转换，转变

参考例句：

• He underwent quite a conversion.他彻底变了。
• Waste conversion is a part of the production process.废物处理是生产过程的一个组成部分。

12 analog   

n.类似物，模拟

参考例句：

• The analog signal contains high-frequency video information,which helps make up the picture.模拟信号包括有助于构成图像的高频视频信息。
• The analog computer measures continuously,without proceeding step by step.模拟计算机不是一步一步地进行，而是连续地进行量度。