专业英语A(中兴08-1).doc

课程名称：《通信技术专业英语》课程代码：0231027 考试方式：开卷 考试时间：120分钟题号一二三四五合计核分人题分2020102030100得分阅读下文，回答问题Our world has this separate infoTmation infrastructUTes: telephones foT voice, televisions for video, and comDuteT networks for data.① These separate voice, video, and data infrastructures are all moving from analog to digital for transmission, multiplexing, and switching.The telephone infrastructure has been digital internally for a long tile. Right now, the telephone companies are trying to organize lower end digital services through IntegTated Services Digital Network (ISDN).The television infrastructure has develoDed fh)m wiieless to cable and is now using jfiber ODtic media, but broadcast still remains an analog technologv. ②The newest information infrastructure, for carrying data among computers, first grew with the development of packet-switching technology in the 1970s. Packet switching was used to transmit data to connect mainframes and minicomputers over wide area networks around the world.® Multimegabit shared-media LAN technology in the 1980s used packet switching to connect workstations and personal computers within buildings.If you*re thinking it's about tile for the telephone, television and computer networking infrastructures to be unified under a single digital technology, you begin to understand ATM, the grand unifier.AsynchTonous TransfeT Mode (ATM) is a digital multiplexing and switching technology. It is developed and standardized by the world's telephone companies to integrate the transmission of voice, video, and data communications.The problem with packet switching for computer networking is that if you want to mix interactive voice and video into your computer network transmissions, you are limited by what used to be packet switching's basic strength.本试卷由教务处监制To efficiently transfer millions of bits per second, packets are different in length, tend to be long, and are routed one by one in software. These qualities have advantages, especially over the circuit switching technologies they replaced, but they result in delays that lead to poor voice and video communications, especially at billions of bits per second.ATM overcomes these delay pToblems by using short fixed-length packets called ceils. End-to-end virtual circuit routes are computed before the transmission. They allow data to be transmitted, multiplexed, and switched quickly by the ATM hardware. Switching, transmission, and routing are now carried out in software, which has the natural speed limitations.ATM will allow von to mix voice, video, and data tTansmissions in the same information infrastructure.⑷ It is widely expected that ATM will be used as the great unifier of the major information infrastructures (voice, video, and data) and the great unifier of the major computer networking modes (WAN, LAN, remote and mobile).得分评分人第一题 请将文中画单横线的词组翻译成中文（每小题2分，共20分）1.ISDN：中文译名 3. WAN：中文译名 5. multiplexing： 7. bits per second.： 9. virtual circuit： 2. ATM： 中文译名 4. LAN：中文译名 6. digital technology： 8 . delay problems: 10 .speed limitations： 得分评分人第二题 请将画双横线的句子翻译成中文（每小题5分，共20分）%1 %1 %1 得分评分人第三题 根据文中信息判断下列句子，正确填T,错误填F。

每小题1分，共10分）1、 （ ）声音、图像和数据基础设施在其传输、多路复用和交换方面都在从模拟方式向数字方式转变2、 （ ）的基础设施其内部还未实现数字化3、 （ ） ATM是利用纯数字技术把、电视和计算机网络基础设施统一起来的技术4、 （ ）异步传输模式（ATM）是一种数字多路复用和交换技术5、 （ ）用于计算机联网的分组交换技术的问题是如果你要把交互式语咅和图像加入到计算机网络的传输中，你就会受到过去所说的分组交换基本能力的限制=6、（7、 （8、 （和交换9、 （10、 （）为有效地传输每秒几百万比特的数据，数据包的长度是相同的数据包在软件中是一个接一个地选择路由的，产生的延迟，使声音和图像通信质量下降）端到端的虚拟电路路由是在传输前计算出来的，从而可使数据由ATM硬件快速地进行传输、复用）传输和路由选择是由硬件实现的，自然有速度的限制ATM已经成为主要的信息基础设施（声咅、图像和数据）的集大成者得分评分人第四题 请将下列中文翻译成英文，（注：缩写形式不给分，每小题2分，共20分）1.全双工3•并行通信5.空间通信7•电视会议9.无线通信2.信噪比4.频分复用6.点到点业务 &防火墙10.短消息服务中心得分评分人第五题 选择题(1-20小题1分，21-25小题2分，共30分)1. C )抽样频率a. sampling rate b・ repetition rate c. sampling frequency2. ( )帧格式a. synchronization word b・ frame format c. reverse operation3. ( )互联网a. network resource b. Internet c. interconnected systems4. ( )搜索工具a. user interface b・ searching tools c. electronic mail5. ( )频谱a. bandwidth b・ spread spectrum c. frequency band6. ( )蜂窝式移动a. cellular switch b・ cellular mobile telephone c. cellular site7. ( )串行接口a. data strearn b. CRT terminal c. serial interface8. ( )发送器和接收器a. transmitter and receiver b. receiver timing c. duration of T seconds9. ( )二进制数据a. binary data b・ data stream c. data transmission10. ( )通信载体a. communication carriers b・ transmission medium c. interface equipment11. ( ) voice encoding techniques12.13.14.15.16.17.18.19.20.21.a・语音编码技术 b.脉冲 c.脉冲编码调制( )the International Organization for Standardizationa.综合业务数字网 b. ISDN的标准和系统结构( )end-to-end digital connectivitya.基本接入信令速率 b.端对端的数字连接( )the branches between nodes节点间的支路 b.中间交换节点 c.全双工的连接)the subscriber that transmit d。