通信英语习题2

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通信专业英语之交流电、直流电以及电信号英语拓展

Exercises
5.The effective value of AC is the value of alternating voltage or current that will have the same effect on a resistance as a comparable value of direct voltage or current will have on the same resistance. (T)
5.When reading an oscilloscope trace it is usual to measure peak-peak voltage.
Exercises
ⅠⅠ
Match the following terms to appropriate definition or expression.
Exercises
a.An electrical signal 1./ time period
b.Peak voltage 2.the maximum voltage reached
2.Alternating Current (AC) always flows in the same direction. ge reached by the signal. (F)
4.Peak-peak voltage is twice the peak voltage (amplitude). (T)
Exercises
Ⅰ
Write T(True) or F(false) beside the following statements about the text.
Exercises
1.Direct Current (DC) flows one way, then the other way, continually reversing direction. (F)

GMDSS通信英语上海500题带翻译

英语阅读500题（单项选择题）1.IMO has decided决定that all ships over 300TGt must be fitted with a NA VTEX receiver______ .IMO在什么时候决定300总吨以上必须配备NA VTEX接收机。

A. by 01 Feb 1992B. by 01 Aug 1993C. between 01 Feb 1992 and 01 Feb 1999D. before 01 Feb 19922.GMDSS is to provide ______ with reliable可靠的communication .GMDSS提供给--所有客船和300总吨及以上货船在海上航行--的可靠通信。

A. all large passenger vesselsB. freighters of more than 300gt in coastal watersC. all passenger ships and cargo ships engaged in international-voyagesD. all passenger ships and cargo ships of 300gt upwards in open sea3.The complying遵从vessels can transmit ship-to-shore distress alerts by at least ______ .这个遵守船舶（公约船）能发送船到岸遇险报警至少通过--两套分开和独立设备方法，使用不同的无线电通信业务。

A. One means, whether satellite or terrestrial techniquesB. Two means,途径whether无论satellite or terrestrial techniquesC. Two separate and independent独立的means, each using different radio communication servicesD. Two means, such as MF DSC and HF DSC4.The quality of the message can be affected 受到影响by ___ .信息的质量会受--气候--影响。

通信英语(翻译短文)

1.If we consider binary transmission, the complete information about a particular message will always be obtained by simply detecting the presence or absence of the pulse. By comparison, most other forms of transmission systems convey the message information using the shape, or level of the transmitted signal; parameters that are most easily affected by the noise and attenuation introduced by the transmission path. Consequently there is an inherent advantage for overcoming noisy environments by choosing digital transmission.研究二进制信号的传输可见，只要简单的区判别脉冲的有和无，完美就获得了一条消息的全部信息。

相比之下，许多其他形式的传输系统是利用被传信号的波形或电平的高低来传送信息的，而这些参数又极易受到传输途径中的噪声和衰耗的影响。

因此选择数字传输系统在克服噪声环境的影响方面有其固有的优势。

2.The reader may ask, how does the demultiplexer know which group of 8-digits relates to channel 1,2, and so on? Clearly this is important! The problem is easily overcome by specifying a frame format, where at the start of each frame a unique sequence of pulses called the frame code, or synchronization word, is placed so at to identify the start of the frame. A circuit of the demultiplexer is arranged to detect the synchronization word, and thereby it knows that the next group of 8-digits corresponds to channel 1.读者也许会问，分路设备怎么会知道哪一组8位码对应于第1路、第2路及其他各路呢？显然这是很重要的。

通信英语(第四版)课后习题名词解释答案加翻译句子

1.PCM原理抽样量化与编码:sampling,quantizing and coding话路:speech channel幅值: amplitude value抽样频率: sampling frequency抽样速率: sampling rate脉冲流: stream of pulses重复率: repetition rate编码过程: coding process模拟信号: analog signal传输质量: transmission quality数字通信: digital communication数字传输: digital transmission含噪声的环境: noisy environment传输路由: transmission path信噪比 :signal-to-noise ratio信号电平 :signal levels噪声功率: noise power地面系统: terrestrial system二进制传输: binary transmission反向操作: reverse operation8-位码序列: 8-digit sequence接受端: receiving terminal帧格式 :frame format同步字 :synchronization word实现这三项功能的方案 :the schemes for performing these three functions一串幅值: a series of amplitude values电话质量的话路 a speech channel of telephone quality一个8位二进制码的序列: a sequence of 8-binary digits理论上的最小抽样频率 :a minimum theoretical sampling frequency占据着300Hz到3.4kHz频率范围的话路: a voice channel occupying the range 300Hz to 3.4kHz 每个样值8-位码: 8-digits per sample value汽车点火系统的打火: the sparking of a car ignition system重复率为64kHz的脉冲流: the stream of the pulses with a repetition rate of 64kHz真实信号与噪声信号的关系: relationship of the true signal to the noise signal由卫星上接受到的信号 :the signal received from a satellite一条特定消息中的全部信息 :the complete informatian about a particular message被传信号的波形 :the shape of the transmitted signal由传输路由引入的衰减: the attenuation introduced by transmission path将抽样的幅值转换成一串脉冲的单元 :the unit that converts sampled amplitude value to a set of pulses涉及到第一路，第二路及其他各路的序列: a sequence relating to channel 1,2 and so on被称为同步字的独特码序列: a unique sequence of pulses called synchronization word地面系统 :terrestrial system脉冲的“有”或“无” : the presence or absence of the pulses高速的电子开关: a high-speed electronic switch时分多路复用器 :the time division multiplexer时分多路复用 :Time Division Multiplexer2.异步串行数据传输串行接口 serial interface显示终端 CRT terminal发送器与接收器 transmitter and receiver数据传输 data transmission数据流 data stream闲置状态 the idle state传号电平 mark level空号电位 space level起始位 start bit停止位 stop bitT秒的持续时间 duration of T seconds奇偶校检位 parity bit错误标志 error flag传输错误 transmission error下降沿 fallinf edge符号间的空格 intersymbol space接收机的定时 receiver timing本地时钟 local clock磁带 magnetic tape控制比特 control bit逻辑1电平 logical 1 level二进制数据 binary data明显的缺点 obvious disadvantage异步串行数据传输 asynchronous serial data transmission最为流行的串行接口 the most popular serial interface所传送的数据 the transmitted data发送器与接收器的时钟 the clocks at the transmitter and receiver电传机的时代 the era of teleprinter一个字符的点和划 the dots and dashs of a character符号间空格持续时间的三倍 three times the duration of intersymbol space被称为字符的比特组 the group of bits called characters由7或8个比特的信息组成的固定单元 the invariable units comprising 7 or 8 bits of information 由接收机本地产生的时钟 a clock generated locally by the receiver在字符后所收到的奇偶校检位 the received parity bit following the character起始位的下降沿 the falling edge of the start bit数据链路面向字符的特性 the character-oriented nature of the data link3.数据通信地下电缆 underground cable通信卫星 communication satellite微波设备 microwave facilities调制器与解调器 modulator and demodulator缓冲器 buffer定时信号 timing signals同步脉冲 synchronization pulses时隙 time slot移位寄存器 shift register传输媒体 transmission medium线形衰弱 linear attenuation信息安全 information security键盘 keyboard数据终端 data terminals某种类型的数据转换设备 some type of data conversion equipment视频显示终端 visual display terminal称为数据调制解调器的双向数据发送接收机 two-way data transmistter-receiver called a data modem 全双工的数据传输系统 full-duplex data trandmission system由数据处理器的运算速率所决定的速率 the rate determined by the operating speed of the data processor由接口部件来的定时信号 timing signals from the interface assembly磁心存储器 magnetic core memories线性衰减和时延特性 linear attenuation and delay characteristics传输损伤 transmission impairments语音中的冗余特性 the redundant nature of speech在数据发送器中的编码过程 coding process in the data transmitter二进制的不归零信号 binary nonreturn-to-zero signal4.互联网网络资源：network resource信息服务：information services远程终端：remote terminals互联的系统：interconnected systems命令：command电子邮件：electronic mail主机：host无线信道：wireless channels搜索工具：searching tools用户界面：user interface存取：access文本信息：textual messages协议：protocol超文本协议：hypertext protocol分布在全世界的计算机的巨大网络：gaint network of computers located all over the world主干系统：backbone system全国范围的网络：nationwild network电子会议：electronic conferences实时对话：live conversation最大的信息库the largest repository of the computers on the net网络设备资源：network facilities resources在网上的绝大多数计算机：the vast majority of the computer on the netUNIX操作系统：the UNIX operating system在因特网和你的PC机之间传送数据的方法：a way to move data between the internet and your PC 方便的搜索工具：the convenient searching tools联网的超文本协议：the network hypertext protocol5.光纤通信介绍光纤通信:optical fiber communications光源：light source波长：wavelength激光器：laser色散：dispersion传输介质：transmission medium多模光纤：multi-mode fiber长途干线：long-houl trunks单模光纤：singer-mode fiber带宽：bandwidth带宽用户：wideband subscriber纤维光学：fiber-optics商用技术：commercial technologe门限电流：threshod current光检测器：photodetector波分复用：wavelength multiplexing纤维光网络：fiber-optic network视频带宽：video bandwidth长途传输：long distance transmission中继距离：repeater spacing已装光纤的总长度：the total length of installed fiber长途通信系统：long-haul telecommunication system低衰减的石英纤维：the low-loss silica fiber衰减接近瑞利极限的光纤：fibers with losses approaching the Rayleigh limit室温下的门限电流：room temperature threshold currents较长波长区：the longer wavelength region用户接入工程：subscriber access project部件性能和可靠性的改进：improvements in component performance and reliability已安装的光纤系统的数据速率：data rates for installed fibre optic system每秒吉比特：gigabit per second range波分复用：wavelength multiplexing带宽用户环路系统：widebend subscriber loop system多纤连接器：multifibre connectors设计寿命：projected lifetime光源：light source单模光纤：single-mode fibre分布反馈式激光器：distributed-feedback laser信息容量：information capacity交换体系：switching hierarchy带宽业务：broadband services9.蜂窝式移动电话系统蜂窝式移动电话：cellular mobile telephone服务性能：services performance频谱：frequency spectrum频带：frequency band微处理器：microprocessor移动手机：mobile unit广播业务：broadcast servise天线：antenna子系统：subsystems移动用户：mobile subscriber服务能力：service capability利用率：utilization带宽：bandwidth单边带：single-sideband扩频：spread spectrum大规模集成电路：large scale integrated circuits蜂窝点：cellular site蜂窝交换机：cellular switch无线机架：radio cabinet呼叫处理：call processing频谱利用率：frequency spectrum utilization有限的指定频带：the limited assigend ferquency band 服务区：servise area复杂的特性和功能：complicated features and functions大规模集成电路技术：large-scale integraesd circuit technology试验性的蜂窝系统：developmental cellular system中央协调单元：central coordinating element蜂窝管理：cellular administration传统移动电话的运行限制：operational limitiation of conventional mobile telephone system 有限的服务能力：limitied service capability无线通信行业：radio communcation industry可用的无线电频谱：available radio frequency spectrum所分配的频带：the allocated frequency band移动收发信机：mobile transceiver技术上的可行性：techological feasibility严格的频谱限制：severe spectrum limitations调频广播业务：FM broadcasting services传播路径衰耗：propagration path loss多径衰耗：multipath fading电话公司地方局:telephone company zone offices10.全球移动通信系统个人通信 personal communcation通信标准 communcation standrads固定电话业务 fixed telephone services网络容量 network capability移动交换中心 mobile switching center国际漫游 international roaming宽带业务 broadband services接口转换 interface conversion频谱分配 frequency allocation模拟方式 analogue mode蜂窝通信原理 cellular communcation principe拥塞 jamming蜂窝裂变 cellular splitting基站 base station寄存器 register收费功能 billing function接入方法 access method突发脉冲传输方式 brusty transimission mode开销信息 overhead information切换算法 handover algorithms短消息服务 short message services技术规范 technical specificationtotal access communcation system 全接入的通信系统global mobile communcation system 全球移动通信系统time division multiple access 时分多址facsimile and short message services 传真和短消息服务fixed communcation networks 固定通信网络a more personalized system 更加个性化的系统the cost and quality of the link 链路的价格和质量market growth 市场的发展fixed telephone service 固定电话服务coxial cable 同轴电缆interface convision 接口转换cellular communcation priciple 蜂窝通信原则frequency reuse and cell splitting 频率复用和蜂窝裂变cochannel interference 共信道干扰theoretical spectual capability 理论上的频谱容量micro-cellular system 微蜂窝系统base station transceiver 基站收发信机subscriber register 用户寄存器burst transmission mode 突发脉冲传输模式overhead information 开销信息advanced handover algorithms 先进的切换算法facsimile and short message services 传真和短消息服务the GSM technique specications GSM技术规范说明一1 . 研究二进制的传输可见, 只要简单地去判别脉冲的“有”和“无”, 我们就获得了一条消息的全部信息。

通信英语(选择)

选择合适的答案填空B A B D D B 1. Furthermore, we shall prove that a minimum theoretical sampling frequency of order 6.8 kilohertz(khz) is required a voice channel the range 300 HZ to 3.4 Khz. Aconvey,occupy B. to convey, occupying C.conveying, occupied D. convey, to occupy 2. For example, the signal from a satellite, in far outer space, is very weak. A.received, located B. receive, locate C.receiving,location D. to receive, to locate 3. If we consider binary transmission, the complete information about a particular message will always by simply the presence or absence of the pulse. A. obtain, detectB. be obtained, detectingC. obtained, detectedD. obtaining, detected 4. there is an inherent advantage for noisy environments by digital transmission. A. overcoming, choose B. overcome, choosing C. overcome, choose D. overcoming, choosing 5. each voice channel has a separate coder, the unit converts sampled amplitude values to a set of pulses; and decoder, the unit performs the reverse operation. A.who,who B. when, when C.where,where D. that, that 6. The problem is easily overcome by a frame format, where at the start of each frame a unique sequence of pulses called the frame code, or synchronization word, is placed the start of the frame. a.specify,identify b.specifying,so as to identify c.specified,identified d. specify, identifying 1. an asynchronous serial data link is said ( )character oriented, as information is transmitted in the form of groups of bits ( )characters. a. be, calling b. to being, to call c. been, call d. to be, called 2. this interface is so called because the ( )data and the ( ) data are not synchronized over any extended period. a. transmit, receive b. to transmit , to receive c. transmitting, receiving d. to be , called 3. serial data transmission systems ( )in the telephone, Morse code, and even the smoke signal once ( ) by native Americans. a. are finding, using b. are found, used c. find, use d. be found, using 4. traditionally, the idle state ( )the mark level. By convention this corresponds ( ) a logical 1 level. a. is referred to, as b. is referred as, in c. is referred to as, to d. is referred, within 5. the transmitter then sends the character, 1 bit at a time, by ( )each successive bit on the line for a duration of T seconds, ( )all bits have been transmitted. a. place, still b. placed, since c. placing, until d. placing, because 6. when the data link connects a CRT terminal ( ) a computer, ( ) problems arise, as the terminal is itself character oriented. a. into, many b. on, a few c. in , a few d. to, few 7.( )the receiving end of a synchronous serial data link, the receiver continually monitors the line ( ) a start bit. a. on, looking b. within , look for c. in, look at d. at, looking for 1. as companies realized they could save money and gain productivity by ( ) networking technology, they added networks and expanded( ) networks almost as rapidly as new network technologies and products could by introduced. a. use, exist b. using, existing c. to use, to exist d. used, existed 2. the OSI reference model allows you ( ) the network functions that occur at each layer. More importantly, the OSI reference model is a framework you can use ( ) how information travels throughout a network. a. view, understand b. viewing, ( ) host ’s system and reassembles the data into a data stream on the ( ) host ’s system. a. sending, receiving b. to send, to receive c. sent, received d. send, receive 4. the data link layer provides the transit of data ( ) a physical link. In so doing, the data link layer is concerned ( ) physical addressing, network topology, network media access, and error detection. a. with, across b. at, in c. between, in d. across, with 1. the TCP/IP model has historical importance, just like the standards that allowed the telephone, electrical power, railroad, television, and videotape industries( ) a. to be created b. to flourish c. to be placed by internet d. to be in use 2. TCP/IP supports dialogues between source and destination while ( ) application layer information into units ( )segments. a. package, call b. to package, to call c. packaged, calling d. packaging, called 3. the purpose of the internet layer is ( ) source packets from any network on the internetwork and have them ( ) at the destination independent of the patch and networks they took to get there. a. to send, arrive b. sending, arriving c. sent, arrived d. to be sent, be arrived 4.IP serves as a universal protocol( ) allows any computer, anywhere,（）at any time. a. it , be communicated b. where, connecting c. who, connected d. that, to communicat e 1. bus topology uses a single backbone segment (length of cable)( )all the hosts directly connect. a. to which b. which c. at that d. in which 2. hierarchical topology is similar to an extended star topology, but instead of ( ) the hubs/switches t to gether, each secondary system is linked to a primary computer that controls the traffic on the topology. a. link b. linking c. linkage d. linked 3. host devices perform the entire process of the encapsulation and de-encapsulation ( ) their job of ( ) e-mails, printing reports, scanning pictures, or accessing databases. a. did, sent b. doing, send c. in doing , to send d. to do, sending 4. the NIC is the basic hardware component of network communications. It translates the parallel signal ( )by the computer into the serial format that is ( ) over the network cable. a. produce, send b. produced, sent c. to produce, to send d. producing, sending 1. Two reasons to use hubs are to create a central connection point for the wiring media, and to increase the reliability of the network. The reliability of the network is increased by ( )any single cable to fail without ( ) the entire network. a. allowing, disrupting b. allow, disrupt c. to allow, to disrupt d. allowed, disrupted 2. Active hubs also are called multiple port repeaters because they have multiple ports and they regenerate the signal ( ) into one port before ( ) it back out the other ports a. come, send b. came, sent c. coming, sending d. being come, being sending 3. A bridge is a layer 2 device ( ) two or more LAN segments, each of which is a separate collision domain. That is , they were designed to create more useable bandwidth. a. designed creating b. design o create c. designing to create d. designed to create 4. Because bridges look only at MAC addresses, they are not concerned ( )network layer protocols. Consequently, bridges are concerned only with passing or not passing frames,（）their destination MAC addresses. a. with based on b. in, to base c. at, basing d. to ,based 1. it was ( ) in 1969, when the U.S. Department of Defense established a nationwide network ( )a handful of universities and contractors. a. start, connect b. started, to connect c. to start, connected d. to start, to connect 2. if somebody else had something interesting ( ) on their computer, it was a simple matter ( ) a copy. a. stored , to obtain b. to store, obtained c. storing, obtaining d. store, obtain 3. the internet is a huge （） systems, but it uses just a handful of method ( )data around. a. interconnect, move b. interconnected, to move c. to interconnect, moved d. interconnecting, moving 4. the most commonly （）network service is electronic mail ( E-mail), or simply as mail. Mail permits network users ( ) textual messages to each other. a. use, send b. to use, sent c. used, to send d. using, sending 5. today thousands of networks and millions of computers ( )the internet. a. are connected to b. connected to c. to connect d. connecting to 6. the simplest way ( ) a file on another host is to copy it across the network to your local host. FTP can do this. a. access b. to access c. accessed d. success 1. One indication of the extent of this development is the total length of ( ) fiber, which was estimated ( )3.2 million kilometers in the U.S. a. install, b b. installing, being c. to install, was d. installed, to be 2. The researchers( ) produced the first clad glass optical fibers were not thinking of ( )them for communications. a. which, use b. that, used c. who, using d.. one, to use 3.The single-mode fiber ,( )in conjunction with a 1.3um laser, provides a bandwidth advantages which translates into ( ) repeater spacings for high-data rate systems. a. used, increased b. using, increase c. use, to increase d. to use, increasing 4. In the telephone system, the use of fiber optics for ( ) central offices within a metropolitan area and for lower levels in the switching hierarchy is still ( ) rapidly. a. interconnect, increase b. interconnecting, increasing c. to interconnect to increase d. interconnected, increased 5. The fibers were fragile, and a way ( ) would have ( ). a. protect, found b. protection, find c. to protect, to be found d. protecting finding 6. Many observers believe that national telephone system will eventually be upgraded( )video bandwidths by ( ) fiber optics. a. handle, use b. handled, used c. handling, usage d. to handle, using 1. One of many reasons for ( ) a cellular mobile telephone system and ( ) it in many cities is the operational limitations of conventional mobile telephone systems a. develop ,deploy b. to develop, to deploy c. developing, deploying d. developed, deployed 2. The ideal mobile telephone system would operate within a ( )assigned frequency band and would serve an almost( ) number of users in ( ) areas. a. limited, unlimited, unlimited b. limitation, limitation, limitation c. limit, limit, limit d. limiting, limiting, limiting 3. LSI technology and mass production contribute to reduced cost ( ) in the near future an average-income family should be able ( ) a mobile telephone unit. a. which, affording b. that, afforded c. when ,afford d. so that, to afford 4. Microprocessors and minicomputers are now ( ) for controlling many complicated features and functions with less power and size ( ) was previously possible. a. used, than b. use, this c. using, they d. usage, it 5. On Jan.4, 1979, the FCC ( ) Illinois Bell Telephone Co. ( ) a developmental cellular system in the Chicago area and make a limited commercial offering of its cellular service to the public.a. authorize, conduct b. authorizing, conducting c. authorized, to conduce d. to authorize, conducted 6. Why 800 MHZ? The FCC ’s decision ( ) 800 MHZ was ( ) because of severe spectrum limitations at lower frequency bands. a. to choose, made b. choose, to make c. choice, make d. choice, making 1. For mobile the problem is far more complex, with the need to roam ( ) a need for complex networks and systems. Thus in mobile the question of standards is far more crucial to success ( ) fixed systems. a. to create, in b. creating, than c. creation, that d. created, with 2. The broadcast mobile networks, ( ) in densely populated areas, could be ( ) by a very small number of simultaneous calls. a. operation, jam b. operate, jam c. operating, jammed d. to operate, to jam 3. The use of digital radio transmission and the advanced handover algorithms between radio cells in GSM network allows for significantly better frequency usage ( ) in analogue cellular systems, thus( ) the number of subscribers that can be served. a. that, creation b. which, create c. the , to create d. than, creating 4. The third generation mobile communication system currently （） in Europe is intended （） all the different services of second generation systems a. in developed, integrate b. be developed, integrated c. to develop, integrating d. being developed, to integrate 1. The switches, ( ) circuit switches, have no capability of ( )user ’s data on their way to the destination. a. calling, stored b. called, storing c. to call, to store d. be called, be stored 2. The circuit is set up by a special signaling message ( ) finds its way through the network, ( ) channels in the path as it proceeds a. that, seizing b. where, seizing c. who, seized d. one, be seized 3. The switching element is a computer ( ) a message processor, with processing and storage capabilities. Messages travel independently and asynchronously, ( ) their own way from source to destination. a. to call, find b. calling, found c. referred to as, finding d. be called, sending 4. A variation of message switching is packet switching. Here the message is broken up into several pieces of a ( ) maximum length, （）packets. a. given, called b. give, call c. giving, calling d. to give, to call 1. ATM transfers information ( ) short packets call “cell s” ( )a fixed length of 48 bytes plus five header bytes. a. of, in b. in, with c. to ,for d. for, without 2.ATM retains all the flexibility of packet mode, ( )only required information ( ). a. enable, convey b. enabling, to be conveyed c. enabled, to convey d. to enable, be conveyed 3. ATM, ( )than any other telecommunications technique, is able ( ) the current and future requirements of both operators and users. a. greater, meeting b. many, to meet c. much, meet d. much more, to meet 4. ATM was initially intended( )high bit rates, but it has in fact proved to be a universal technique for ( )any type of digitized information at a wide variety of bit rates. a. handle, switch b. handling, to switch c. handled, switched d. to handle, switching 5. On the other hand, ATM retains all the flexibility of packet mode, ( )only required information( ). a. enabling, to be conveyed b. enable , be conveyed c. to enable, to convey d. enabled, conveyed 6. ATM dated from the beginning of the 1980s: at the time, people ( ) to find the most suitable technique for ( ) high bit rate channel at more than 100 Mbit/s. a. is trying, switch b. were trying, switching c. are trying, to switch d. want to try, to switch 1. the telephone contains a transmitter an receiver for ( ) back an forth ( )analog voice and analog electrical signals. a. cover, in b. converting, between c. conversion, to d. converted, into 2. each subscriber connects ( )local loop to a switching center, ( ) as a end office. a. to ,calling b. with, known c. the, know d. via, known 3. the trunks are designed ( ) multiple voice-frequency circuits ( ) either FDM or synchronous TDM. a. carry, use b. carried, used c. to carry, to use d. to carry, using 4. Although originally designed and ( ) to service analog telephone subscribers, it handles substantial data traffic( ) modem, and is gradually being converted to a digital network. a. implemented, via b. implementing, in c. to implement, within d. design, on 5. designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five chasses of switching centers or nodes. a. organization, consist b. organize, consisting c. to organize, consisting of d. organizing, to consist 1. ISDN ’s enormous importance only gradually being ( ). Years of work have been ( ) the CCITT and the ISO. a. understand, carry b. understanded, carried c. to be understood, to carry d. understood, carried out 2. the term ISDN was first defined within the CCITT in 1972. it referred to a network ( ) end-to-end digital connectivity( ) a range of services. a. providing, for b. provision, to c. provided, with d. provide, into 3.similarly, the introduction of voice encoding techniques ( ) ulse code modulation contributed ( ) the ISDN ’s concept evolution. a. usage, on b. using, to c. use, with d. used , so as to 4. in fact, ISDN ( ) conceived a quarter of a century ago and is only now ( )to reach maturity. a. is, begin b. was beginning c. be, to begin d. will be, began 5. the enhanced quality is achieved when a signal is digitally encoded ( )degradation ( )the transmission medium. a. overcome, to b. overcame, with c. overcoming, over d. to overcome, due to 6. as regards economy, early studies suggested that digital services ( )significant advantages since a substantial quantity of interface equipment in the telephone exchange could( ). a. offered, be eliminated b. offer, eliminate c. offers, is eliminated d. to offer, to eliminate 1. computer data ( ) in the public domain by a packet switched data network ( ) x..25 protocols. a. are transported, based on b. transports, base on c. transported, based on d. to transport, base 2. when ( ) the future BISDN network, one must ( ) all possible existing and future services. a. design, take b. designing, take into account c. designed, account d. to design, taking 3. a telex network ( ) telex information, i.e. messages of characters, ( )at very low speed. a. transports, transported b. transported, transport c. to transport, to transport d. transporting 4. the N-ISDN cannot transport TV signals ( ) its limited bandwidth capabilities, so a special TV network is still( ). a. because, require b. with, to require c. due to , required d. within, requiring 5. each network is only capable ( )one specific service for ( ) it was intentionally designed. a. of transporting, which b. transporting, one c. transport, where d. to transport, when。

通信工程专业英语Unit 2：Digital Communication System

专业英语的翻译
省略：根据汉语语法的修辞习惯，将原文中的某些词语略去不译。（如英语中的冠词、代词和连词）
Air is a fluid but not a liquid.
空气是流体, 不是液体。（省略冠词） If you know the frequency, you can find the wave length. 如果知道频率，就能求出波长。（泛指的人称代词you 可省略不译）
TEXT
The use of digital methods for the transmission of analog signals is becoming increasingly common in telecommunication systems. There are two major reasons for this. digital :数字的, 数位的
Specialized English for Communication Engineering
专业英语的翻译
句子结构上有差异词汇上很少对等
English
Chinese
死译硬译直译：基本上保留原文的表达形式及内容，不做大的改动，同时译出的文字又明白易懂；胡译意译：在正确理解原意的基础上，重新遣词造句，把原文的意思用通顺的汉语表达出来。
The reliability can be further improved by using errordetecting and error-correcting codes.
利用检错和纠错编码能进一步提高可靠性。（被动语态转译为主动语态） Specialized English for Communication Engineering

GMDSS听力评估和通信英语_考试题型、码语音标和码语

Oktoeight
[ɔktəu'eit]
Novenine
[nəuvei'nain]
Decimal
['desiməl]
5952 练习二(1112)

ACEGI BDFHJ VXZEG IBDFH CVXZE GIBDF ACVXZ EGIBD 1404 1634
KMOQS JKMOQ HJKMO FHJKM
1542(1-99)

51.GHY48 52.65DYG 53.O9TR9 54.54ESJ 55.FU58D 56.JH48I 57.NKZ37 58.CUY39 59.U5E7T 60.S95W8 61.JR7W8 62.HU27O 63.8ERJK 64.UI8R9 65.IOAD8 66.9DE7J 67.ABG57 68.FUB37 69.7VG2F 70.X5JFD 71.F7QM3 72.H67XV 73.ZAQ34 74.WSX45 75.DC56E 76.RFV12 77.TB08G 78.HN23Y 79.MJU44 80.POI16 81.KLQ93 82.GR76V 83.YDF84 84.AL36C 85.8DSG2 86.X7FJ4 87.K7WGF 88.JAYG9 89.HF57E 90.PI98E 91.9DG3D 92.HF65N 93.AI78F 94.F72HFL 95.UNF7R 96.9BH3F 97.6BWT8 98.APR65 99.H75FY 1644

辉11 1.V71M5 2. SJ3MB 3. AC0JW 4. Y8U3H 5. HZ476 6. 25DRK 7. G281E 8. LN36S 9. TOFIB 10. ZQNX8

信息与通信工程专业英语(第2版)-韩定定-李明明汇编

第一课现代数字设计及数字信号处理课文 A: 数字信号处理简介1.什么是数字信号处理？数字信号处理，或DSP，如其名称所示，是采用数字方式对信号进行处理。

在这种情况下一个信号可以代表各种不同的东西。

从历史的角度来讲，信号处理起源于电子工程，信号在这里意味着在电缆或电话线或者也有可能是在无线电波中传输的电子信号。

然而，更通用地说，一个信号是一个可代表任何东西--从股票价格到来自于远程传感卫星的数据的信息流。

术语“digital”来源于“digit”，意思是数字（代可以用你的手指计数），因此“digital”的字面意思是“数字的，用数字表示的”，其法语是“numerique”。

一个数字信号由一串数字流组成，通常（但并非一定）是二进制形式。

对数字信号的处理通过数字运算来完成。

数字信号处理是一个非常有用的技术，将会形成21世纪的新的科学技术。

数字信号处理已在通信、医学图像、雷达和声纳、高保真音乐产生、石油开采等很广泛的领域内引起了革命性的变革。

这些领域中的每一个都使得DSP技术得到深入发展，有该领域自己的算法、数学基础，以及特殊的技术。

DSP发展的广度和深度的结合使得任何个人都不可能掌握已发展出的所有的DSP技术。

DSP教育包括两个任务：学习应用数字信号处理的通用原则及学习你所感兴趣的特定领域的数字信号处理技术。

2.模拟和数字信号在很多情况下，所感兴趣的信号的初始形式是模拟电压或电流，例如由麦克风或其它转换器产生的信号。

在有些情况下，例如从一个CD播放机的可读系统中输出的信号，信号本身就是数字的。

在应用DSP技术之前，一个模拟信号必须转换成数字信号。

例如，一个模拟电压信号，可被一个称为模数转换器或ADC的电路变换成数字信号。

该转换器产生一系列二进制数字作为数字输出，其值代表每个采样时刻的输入模数转换设备的电压值。

3.信号处理通常信号需要以各种方式处理。

例如，来自于传感器的信号可能被一些没用的电子“噪声”污染。

电子与通信技术专业英语(第4版)Unit 2 lesson 10

rases:
内在地；固有地脆弱的，易碎的解码转动的易受……影响的结实的，坚固的兆字节高端的服务器配件，附件电缆
Text
New word
Notes
Exercises
Translation
Vocabulary
New words and phrases:
Text
New word
Notes
Exercises
Translation
Vocabulary
Notes:
PART
4.The mechanics of the player itself however can be quite sturdy, and are generally not as prone to permanent damage due to being dropped as hard drive-based players. 译文：这种播放器比硬盘型播放器坚固，一般不容易因摔到地上而出现永久性损坏。 as … as: 指“两个人或物在某方面一样”，既可以用在肯定句里，也可以用在否定句中，而so ... as ...只能用在否定句里。 prone to: 很可能，如：People are more prone to make mistakes when they are tired.
Digital audio players are generally categorized by storage media: Flash-based players: These are non-mechanical solid state devices that hold digital audio files on internal flash memory . Because they are solid state and do not have moving parts, they require less battery power, and may be more resilient to hazards such as dropping or fragmentation than hard disk-based players. Hard drive-based players or digital jukeboxes: Devices that read digital audio files from a hard disk drive (HDD). These players have higher capacities as of 2010 ranging up to 500 GB. At typical encoding rates, this means that tens of thousands of songs can be stored on one player. The disadvantages with these units is that a hard drive consumes more

电子与通信专业英语(第三版)课后答案1-4单元

1 (1)a (2)d (3)c (4)b (5)a2 1e 2a 3h 4b 5g 6c 7d 8f3(1）微积分在解析几何的帮助下，被证明能够有效的解决许多早先无法解决的问题。

（2）在17 世纪的许多重大数学发明中，毫无疑问最杰出的就是微积分。

（3）当法国数学家奥古斯丁*路易斯*柯西发展相互一种可接受的极限理论，并由此定义了连续性，微分和极限概念下的定积分，这成为1821年数学史上的巨大飞跃。

4) 数学分析是高等数学中的最重要分支中的一个，它的主要目的是研究变量和他们之间的关系。

5）自然数学或技术科学的一个主要目的是建立考虑的过程中的变量之间的关系并用数学描述。

6数学方法是物理学、机械学、工程学和其他自然科学的基础，对所有学科来说，数学是有利的理论和应用工具，没有数学就不可能科学计算工学和技术。

Unit 21 (1)c (2)c (3)b (4)d (5)c2 1f 2i 3g 4e 5c 6a 7j 8h 9d 10b31）描述精确的随机变量的分析需要许多信息，而且描述两个或以上变量的联合发布需要更多的信息2）二项分布和泊松分布在所有离散分布中应用最广泛的，由于他们的概率分布在统计性质控制中的重要（作用），这种概率分布对工程人员来说是非常重要。

3）对于任何随机变量，在两个点分布函数的差异是随机变量取这两点间（或端点）的值的概率4）一般来说，随机事件的概率P在进行大量的重复实验时能以均值来确定，该事件发生的次数是p乘以实验次数5）在统计学中，将任何观察过程叫做实验是一个习惯6）如果在特定的现实情况下，某时间确定不能发生，那么称之为不可能事件4(1) c electrons d(2) a b(3) amplifiers be amplified(4) (a) variates(b) variables(c) e d(d) fUnit 31 (1)a (2)b (3)a (4)a (5)c21e 2g 3a 4i 5c 6b 7h 8d 9f 10k 11 l 12j3 (1)运放可以有一个闭环或开环运算。

通信工程英语

通信工程英语1.Installation设备、设施、安装2.overheadpolelineinstallation架空杆线安装3.undergroundburiedcable地下直埋安装4.loosetubecable松套光缆5.doublejacket双层护套6.armoredjacket铠装护套7.cross-countryroutes野外路由8.plowequipment开沟设备9.Steel-armoreddirectburialcable钢铠装直埋光缆10.undergroundducts地下管道11.heavyarmoreddirectburialcable重型铠装直埋光缆12.diggingoperationsbegin开沟作业前13.soilconditions土壤条件14.cableroute光缆路由沿线15.cable-placing equipment 光缆敷设设备16.installationdepth敷设深度17.undergroundutilities地下公共设施18.properright-of-way通行权19.plowingin a cable 犁沟敷设光缆20.directionboring定向钻孔21.directionboringmachine定向钻孔机22.frostconditions 霜洞线23.groundfrostheaves冰冻冷胀24.loaddistribution负荷分布25.opticalfibermicrobending光纤微弯损耗26.settlingofthebackfill回填土，沉陷27.fencing打围28.warningtape警示带29.cablemarkers光缆标记30.galvanizedsteelpipe镀锌钢管31.concreteslabs水泥板32.providecrushresistance耐压性能33.terminationpoints光缆中节点34.groundwire接地线pression-typegroundclamp压缩接地夹36.bolt螺栓37.groundterminalstrip接地端直板38.lowresistivepath低电阻通道39.locatingequipmentsignalgenerator定位信号发生装置40.8roundbar8号接地棒41.hand hole 手孔42.excesscable余缆43.cablingsystems光缆网络系统44.manhole人孔45.high-densitypolyethylene（HDPE）高密度聚乙烯46.epoxyfiberglasscompound环氧玻璃化合物47.corrugatedtype波纹类型48.corrugatedinnerduct波纹直管49.springaction弹力作用50.pullingtape牵引带51.ductingsystems 管道系统52.fillratio填充率53.fiberopticcablelubricant光缆润滑剂54.coefficientoffriction摩擦系数55.flame-retardant阻燃的56.lubricant collarandpump馈送漏斗57.maximumanticipatedpulltension预计最大牵引张力58.Aswivel转接头59.Cabletwisting光缆钮绞60.aircompressor空气压缩机61.engineeringdesign工程设计62.pullingtension牵引张力63.routerlength路由长度64.spliceenclosurelocation接头盒位置65.fiberlinkattenuation光纤链路衰减66.openflames明火67.electricspark电火花68.fusionsplicer光纤熔接机69.flammablegases存在易燃气体70.safetyandhealthregulations安全卫士法规71.ductsareclear清洁管道72.reelvault缆盘人孔73.powerwinch&tensionmonlior张力检测仪74.cable-pullingwinch光缆牵引绞盘75.strip-charttensionrecorder子带张力记录仪76.dynamicelectronicdisplay动态电子显示器77.feedertube配送管道78.barefiberadapter裸纤测配仪79.cablegrip缆夹、缆扣80.figure8coilpattern8字形卷81.emergencyrepair抢修82.cableracking光缆分接83.innerductendplugs内口端头筛84.fiberopticcabletags光缆标签85.cableblowing吹送光缆86.steelmessenger钢制吊线87.self-supportingfiberopticcable自承式光缆88.polespan杆距89.cablesag光缆弧垂90.polelinework杆线作业91.electricfieldradiation电场辐射92.cablereeltrailer缆盘拖车93.buckettruck铲车94.wheelblocks滑轮95.deat-endclamps耐张线夹96.expansionloop膨胀环97.atterminatingpoles终端杆98.risercable引上光缆99.cableriser光缆引上管100.safetyprecautionareobserved安全防护措施101.sagtension垂弧张力shingclamp缠扎机夹具shingwire扎线104.routeplanning路由规划105.raceway配线管道106.class2and3remotecontrolsignalingcircuits2类、3类遥控信令电路107.crushresistance耐压性能108.pullboxes牵引箱109.straight-throughpullbox直通牵引箱110.acomerpullbox拐角牵引箱111.verticalinstallations垂直安装112.tensileload拉伸负荷113.maximumcableverticalrise光缆最大垂直安装高度114.cableclamps光缆线夹115.opticalfiberdistributionpoint光缆配线点116.patchpanel接线板117.horizontalcableroutes水平光缆路由118.suspendedceilings天花板吊顶119.raisedfloors活动地板120.equipmentrack机架121.strengthmember加强件122.cablesheath光缆护套123.splicetrays熔纤盘124.mechanicalsplices机械接头125.barefusionsplices裸纤126.heat-shrinkfusionsplion热缩溶解接头127.opticwavelength-sensitive对光的波长敏感128.fiberspliceprotectors光纤接头保护罩。

通信英语(第四版)课后习题名词解释答案加翻译句子

通信工程专业英语习题答案

练习参考答案第1单元信号与系统1．完形填空(1) band-limited, cutoff frequencies, to, between, the information rate is proportional to the bandwidth of the channel, on, to, by, by simply increasing the number of levels, noise will cause the receiver to mistake one level for another, no matter how elaborately the data is coded, between, theoretical maxima.(2) from, a loss of information , the twisted pair, addition of noise to the signal, depends on the signal frequency, the high-frequency components of the signal, over, between, through, of, with, including.(3) for, to, In some cases, over, (microwave relay, coaxial cable, or fiber), ADC, to, thereby achieving a reduction in required channel bandwidth, of, signal recovery, (Techniques such as filtering, auto-correlation and convolution).2．英汉互译(1) “电信”（telecommunication）一词来源于希腊语tele（含义为“遥远的”）和拉丁语communicatio（涵义为“连接”）。

自考通信英语试题

通信英语I单项选择1．抽样频率a. sampling rateb. repetition ratec. sampling frequency答案：c2．数字通信a. digital communicationb. digital transmissionc. transmission path答案：a3．帧格式a. synchronization wordb. frame formatc. reverse operation答案：b4．噪声功率a. noisy environmentb. signal levelsc. noise power答案：c5．含噪声的环境a. signal levelsb. noisy environmentc. noise power答案：b6．模拟信号a. speech channelb. analog signalc. amplitude value答案：b7．脉冲流a. stream of pulsesb. receiving terminalc. terrestrial system答案：a8．传输路由a. transmission pathb. transmission qualityc. binary transmission答案：a9．互联网a. network resourceb. Internetc. interconnected systems答案：b10．命令a. copyb. hostc. command答案：c11．拷贝a. addressb. mousec. copy答案：c12．搜索工具a. user interfaceb. searching toolsc. electronic mail答案：b13．存取a. accessb. protocolc. copy答案：a14．网络资源a.textual messagesb. remote terminalsc. network resources答案：c15．文本信息a. information servicesb. hypertext protocolc. textual messages答案：c16．频谱a. bandwidthb. spread spectrumc. frequency band答案：b17．移动手机a. mobile subscriberb. mobile unitc. service performance答案：b18．频带a. frequency spectrumb. frequency bandc. spread spectrum 答案：b19．蜂窝交换机a. cellular switchb. cellular sitec. mobile unit答案：a20．单边带a. single-sidebandb. bandwidthc. service area答案：a21．服务区a. service areab. service performancec. service capability 答案：a22．移动用户a. mobile unitb. mobile subscriberc. mobile transceiver答案：b23．微处理器a. subsystemsb. utilizationc. microprocessor答案：c24．无线机架a. radio cabinetb. antennac. mobile unit答案：a25．电路交换a. packet switchingb. circuit switchingc. message switching 答案：b26．分组交换a. packet switchingb. circuit switchingc. message switching 答案：a27．报文交换a. packet switchingb. circuit switchingc. message switching 答案：c28．专用电路a. dedicated circuitb. error controlc. return signal答案：a29．突发性a. burstyb. randomc. header答案：a30．传输时延a. destination addressb. transmission delayc. return signal 答案：b31．中间交换设备a. given maximumb. intermediate switching equipmentc. store-and-forward manner答案：b32．子网a. headerb. subnetc. busty答案：b33. 公众电信网a.public telecommunication networkb. intermediate switching nodec. circuit- switched network答案：a34.半双工的a. full-duplexb. half-duplexc. external call答案：b35. 端局a. toll centerb. end officec. tandem switch答案：b36. 外部呼叫a. external callb. data trafficc. toll center答案：a37.链路a. trunkb. linkc. route答案：b38.交换节点a. intermediate switching nodeb. voice-frequency circuitc. switching node答案：c39.音频电路a. telephone subscriberb. voice-frequency circuitc. two wire connection答案：b40.拓扑a. internodesb. topologyc. route答案：b41.二线连接a. data trafficb. end officec. two wire connection答案：c42.数据流量a. data trafficb. tandem switchc. toll center答案：a43.全球通信a. interface equipmentb. global communicationc. communication carriers答案：b44.脉码调制a. pulse code modulationb. voice encodingc. open network 答案：a45.接口设备a. switching equipmentb. transmission mediumc. interface equipment答案：c46.综合业务数字网a)end-to-end digital connectivityb. international organization for standardizationc. integrated services digital network答案：c47.通信载体a. communication carriersb. transmission mediumc. interface equipment答案：a48.系统结构a. infrastructure c. flexibility d. basic access答案：a49.蜂窝式移动电话a. cellular switchb. cellular mobile telephonec. cellular site答案：b50.数据传输a. data transmissionb. transmission errorc. error flag答案：a51.传号电平a. space levelb. logical levelc. mark level答案： c52.接收机的定时a. intersymbol spaceb. serial interfacec. receiver timing 答案：c53.明显的缺点a. transmission errorb. obvious disadvantagec. error flag答案：b54. 起始位a. start bitb. stop bitc. parity bit答案：a55.空号电平a. mark levelb. space levelc. the idle state答案：b56.控制比特a. binary datab. local clockc. control bit答案：c57.串行接口a. data streamb. CRT terminalc. serial interface答案：c58.发送器和接收器a. transmitter and receiverb. receiver timingc. duration of T seconds答案：a59.二进制数据a. binary datab. data streamc. data transmission答案：a60.高速电子开关a. the voice channelb. the repetition ratec. a high-speed switch答案：cII.根据所给英文选择合适的答案1．digital communicationa.全球通信b. 公共通信载体c.数字通信答案：c2．voice encoding techniquesa.语音编码技术b. 脉冲c. 脉冲编码调制答案：a3．basic access signaling ratea.大量的接口设备b. 基本接入信令速率c. 统一的接入答案：b4．the International Organization for Standardizationa.综合业务数字网b. ISDN的标准和系统结构c. 国际标准化组织答案：c5．end-to-end digital connectivitya. 基本接入信令速率b.端对端的数字连接c. 语音编码技术答案：b6．progressive application of digital technologya.由于传输媒体导致的质量下降b.4KHz 话路中所固有的带宽限制c.数字技术的逐步应用答案：c7．enhanced qualitya.高质量b. 带宽的限制c.统一的接入答案：a8．the branches between nodesa.节点间的支路b. 中间交换节点c. 全双工的连接答案：a9．tree topologya. 双绞线b. 结构部件c. 树状拓扑答案：c10．backbone hierarchical networka. 国家网络b. 被分离开的子网c. 主干体系网络答案：c11．the subscriber that transmit digital signala. 发送数字信号的用户b. 一小部分用户c. 相邻的端局答案：a12．multiple voice-frequency circuitsa. 高效中继线b. 多音频电路c. 同步时分复用答案：b13．the function of concentrating traffica.集中话务量的功能b. 路由选择的基本次序c. 发送数字信号的用户答案：a14．full duplexa. 全双工的连接b. 全连通性c. 全双工的答案：c15．transmission facilitiesa. 传输设备b. 交换区c. 高效中继线答案：a16．switching techniquea.交换技术b. 电路交换c. 分组交换答案：a17．message switchinga.交换技术b. 报文交换c. 分组交换答案：b18．communication partiesa.传输单元b. 通信各方c. 返回信号答案：b19．the special signaling messagea. 存储转发传输技术b. 带宽的动态分配c. 特定的信令信息答案：c20．low channel utilizationa. 低的电路利用率b. 报文整个的传输时延c. 传输单元答案：a21．total path of connected linesa. 连线的整个通路b. 源到目的地的一对c. 带宽的动态分配22．radio cabineta. 无线通信行业b. 无线机架c. 多径衰耗答案：b23．telephone company zone officesa.移动收发信机b. 电话公司地方局c. 中央协调单元答案：b24．available radio frequency spectruma. 所分配的频带b. 调频广播业务c. 可用的无线电频谱答案：c25．central coordinating elementa. 中央协调单元b. 试验性的蜂窝系统c. 有限的服务能力答案：a26．severe spectrum limitationsa.严厉的频谱限制b. 有限的服务能力c. 有限的指定频带答案：a27．developmental cellular systema. 频谱利用率b. 试验性的蜂窝系统c. 传统移动电路的运行限制答案：b28．propagation path lossa. 调频广播业务b. 传输路径衰耗c. 无线机架答案：b29．backbone systema.主干系统b. 电子会议c. 远程终端答案：a30．live conversationa.最大的信息库b. 文本信息c. 实时的对话答案：c31．textual messagesa.搜索工具b. 万维网c. 文本信息答案：c32．the networked hypertext protocola.联网的超文本协议b. 网络设备资源c. 全国范围的网络答案：a33．the Unix operating systema. 主干系统b. 万维网c. Unix 操作系统答案：c34．the vast majority of the computers on the neta.在网上的绝大多数计算机b. 分布在全世界的计算机的巨大网络c. 全国范围的网络答案：a35．remote terminala. 电子会议b. 远程终端c. 文本信息36．the largest repository of informationa. 最大的信息库b. 实时的对话c. 方便的搜索工具答案：a37．the time division multiplexera. 时分多路复用b. 高速的电子开关c. 时分多路复用器答案：c38．A high-speed electronic switcha. 高速的电子开关b. 被传信号的波形c. 时分多路复用答案：a39．time Division Multiplexinga. 时分多路复用b. 时分多路复用器c. 地面系统答案：a40．the presence or absence of the pulsea. 一串幅值b. 每样值8 位码c. 脉冲的“有”或“无”答案：c41．the unique or absence of the pulsea. 脉冲的“有”或“无”b. 被称为同步字的独特的码序列c. 将抽样的幅值转换成一串脉冲的单元答案：b42．A sequence relating to channel1, 2 and so ona.涉及到第一路、第二路及其他各路的序列b.一条特定消息中的全部信号c.理论上的最小采样频率答案：a43．the schemes for performing these three functionsa. 电话质量的话路b. 由卫星上收到的信号c. 实现这三项功能的方案答案：c44．a series of amplitude valuesa.一串幅值b. 被传信号的波形c. 每样值8位码答案：a45．A speech channel of telephone qualitya. 实现这三项功能的方案b. 将抽样的幅值转换成一串脉冲的单元c. 电话质量的话路答案：c46．A sequence of 8-binary digitsa. 每样值8位码b. 一个8位二进制序列c. 一串幅值答案：b47．A minimum theoretical sampling frequencya. 理论上的最小采样频率b. 抽样量化和编码c. 将抽样的幅值转换成一组脉冲的单元答案：a48．the sparking of a car ignition systema. 高速电子开关b. 理论上的最小采样频率c. 汽车点火系统的打火答案：c49．the stream of the pulses with a repetition rate of 64KHz a. 真实信号与噪声信号的关系 b. 由传输路由引入的衰减c. 重复率为64KHz的脉冲流答案:c50．the relationship of the true signal to the noise signala. 真实信号与噪声信号的关系b. 脉冲的有和无c. 被称为同步字的独特的码序列答案：a51．terrestrial systema. 高速电子开关b. 地面系统c. 时分多路复用答案：b52．asynchronous serial data transmissiona. 数据链路面向字符的特征b. 异步串行数据传输c. 异步串行接口答案：b53．isolated subnetworksa. 被分离的子网b. 高效中继线c. 交换区答案：a54．two subscribers attached to different end officesa. 在站和网络之间的接口b. 路由选择的基本次序c. 连到不同端局的两个用户答案：c55．synchronous TDMa. 同步时分复用b. 多条音频电路c. 节点间的之路答案：a56．the clocks at the transmitter and receivera. 符号间空格持续时间的三倍b. 在字符后所收到的奇偶校验位c. 发送器和接收器时钟答案：c57．the transmitted dataa. 电传机时代b. 一个字符的点和划c. 所发送的数据答案：c58．the falling edge of the start bita. 起始位的下降沿b. 停止位的下降沿c. 电传机时代答案：a59．the group of bits called charactersa. 数据链路面向字符的特征b. 在字符后所收到的奇偶校验位c. 被称为字符的比特组答案：c60．A clock generated locally by the receivera. 最为流行的串行接口b. 由接收机本地产生的时钟c. 发送器和接收器的时钟答案：bIII.选择合适的答案1.Furthermore, we shall prove that a minimum theoretical sampling frequency of order 6.8KHz is required ( ) a voice channel ( ) the range 300 Hz to 3.4KHz.a. convey , occupyb. to convey, occupyingc. conveying , occupiedd. convey, to occupy答案：b2. For example, the signal ( ) from a satellite, ( ) in far outer space, is very weak.ａ. received, located b. receive, locate c. receiving, locatingd. to receive, to located答案：a3. If we consider binary transmission, the complete information about a particular message will always () by simply ( ) the presence or absence of the pulse.ａ.obtain, detect b. be obtained, detecting c. obtained, detectedd. obtaining, detected答案：ｂ4. There is a inherent advantage for ( ) noisy environments by ( ) digital transmission.ａ．overcoming, choose b. overcome, choosing c. overcome, choosed. overcoming , choosing答案：d5. Each voice channel has a separate coder, the unit ( ) converts sampled amplitude values to a set of pulse; and decoder, the unit ( ) performs the reverse operation.ａ．who, who b. when, when c. where, where d. that , that答案：d6. The problem is easily overcome by ( ) a frame format, where at the start of each frame a unique sequence of pulses is placed ( ) the start of the frame.a.specify, identifyb. specifying, so as to identifyc. specified, identifiedd. specify, identifying答案：b7. It was ( ) in 1969, when the U.S. Department of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to connect答案：b8. If somebody else had something interesting ( ) on their computer, it was a simple matter ( ) a copy.a.stored, to obtainb. to store, obtainedc. storing, obtainingd. store, obtain9. The Internet is a huge ( ) systems, but it users just a handful of method ( ) data around.a.interconnect, moveb. interconnected, to movec. to interconnect, movedd. interconnecting, moving答案：b10. The most commonly ( ) is electronic mail (E-mail) , or simply as mail, Mail permits network users ( ) textual messages to each other.e, sendb. to use, sentc. used, to sendd. using , sending答案：c11. Today thousands of network s and millions of computers ( ) the Internet.a.are connected tob. connected toc. to connectd. connecting to答案：a12. The simplest way ( ) a file on another host is to copy it across the network to your local host, FTP can do this.a.accessb. to accessc. accessedd. success答案：b13.One of many reasons for ( ) a cellular mobile telephone system and ( ) it in many cities is the conventional mobile telephone system.a.develop, deployb. to develop, to deployc. developing, deployingd. developed, deployed答案：c14. The ideal mobile telephone system would operate within a ( ) signed frequency band and would serve an almost ( ) number of users in ( ) areas.a.limited, unlimited, unlimitedb.limitation, limitation, limitationc.limit, limit, limitd. limiting, limiting, limiting答案：a15. LSI technology and mass production contribute to reduced cost ( ) in the future an average-income family should be able ( ) a mobile telephone unit.a.Which, affordingb. that, affordedc. when, affordd. so that, to afford答案：D16. Microprocessors and minicomputers are now ( ) for controlling many complicated features and functions with less power and size ( ) was previously possible.a. used, thanb. use, thisc. using, theyd. usage, it答案：a17. On Jan.4,1979, the FCC ( ) Illinois Bell Telephone Co. ( ) a developmental cellular system in the Chicago area and make a limited offering of its cellular service to the public.a. authorize, conductb. authorizing, conductingc. authorized, to conductd. to authorize, conducted18. Why 800 MHz? The FCC’s decision ( ) 800 MHz was ( ) because of severe spectrum limitations at lower frequency band.a.to choose, madeb. choose, to makec. choice, maked. choice, making答案：a19. The switch, ( ) circuit switches, have no capability of ( ) user’s data on their way to the destination.a. calling, storedb. called, storingc. to call, to stored. be called, be stored答案：b20. The circuit is set up by a special signaling message ( ) finds its way through the network, ( ) channels in the path as it proceeds.a. that, seizingb. where, seizingc. who, seizedd. one, be seized答案：a21. -The switching element is a computer ( ) a message processor, with processing and storage capabilities. Message travels independently and asynchronously, ( ) their own way from source to destination.a. to call , findb. calling, foundc. referred to as, findingd. be called, sending答案：c22. A variation of message switching is packet switching. Here the message is broken up into several pieces of a ( ) maximum length, ( ) packets.a. given, calledb. give, callc. giving, callingd. to give, to call答案：a23. The telephone contains a transmitter and receiver for ( ) back and forth ( ) analog voice and analog electrical signals.a. convert, inb. converting, betweenc. conversion, tod. converted, into答案：b24. Each subscriber connects ( ) local loop to a switching center, ( ) as an end office.a. to, callingb. with, knownc. the , knowd. via, known答案：d25. The trunks are designed ( ) multiple voice-frequency circuits ( ) either FDM or synchronous TDM.a. carry, useb. carried, usedc. to carry, to used. to carry, using答案：d26. Although originally to service analog telephone subscribers, the telephone network handles substantial data traffic ( ) modem, and gradually beingconverted to a digital network.a. implemented, viab. implementing, inc. to implement, withind. design, on答案：a27. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers or nodes.a. organization, consistb. organize, consistingc. to organize, consisting ofd. organizing , to consist答案：c28. ISDN’s enormous importance is only gradually being ( ) . Years of work have been ( ) by the CCITT and the ISO.a. understand, carryb. understanded, carriedc. to be understood, to carryd. understood, carried out答案：d29. The term ISDN was first defined within the CCITT in 1972. It referred to a network ( ) end-to-end digital connectivity ( ) a range of services.a. providing, forb. provision, toc. provided, withd. provide, into答案：a30. Similarly, the introduction of voice encoding techniques ( ) pulse code modulation contributed ( ) the ISDN’s concept evolution.a. usage, onb. using, toc. use, withd. used, so as to答案：b31. The enhanced quality is achieved when a signal is digitally encoded ( ) degradation ( ) the transmission medium.a. overcome, tob. overcame, withc. overcoming, overd. to overcome, due to答案：d32. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：d33. As regards economy, early studies suggested that digital services ( ) significant advantages since a substantial quantity of interface equipment in the telephone exchange could ( ).a. offered, be eliminatedb. offer, eliminatec. offers, is eliminatedd. to offer, to eliminate答案：a34. If we consider binary transmission, the complete information about a particular message will always ( ) by simply ( ) the presence or absence of the pulse.a. obtain, detectb. be obtained, detectingc. obtained, detectedd. obtaining, detected答案：b35. An asynchronous serial data link is said ( ) character oriented, as information is transmitted in the form of group of bits ( )characters.a. be, callingb. to being, to callc. been, calld. to be, called答案：d36. It was ( ) in 1969, when the U.S Department of Defense established a nationwide network ( ) a handful of universities and contractors.a. start, connectb. started, to connectc. to start, connectedd. to start, to define答案：b37. Thus was born a new, but perpetually ( ) paging services ( ) at a one-way selective signaling system without speech.a. developing, consistingb. organize, consist ofc. develop, defined. to develop, to define答案：a38. Designers have found it convenient ( ) these nodes into a hierarchy or tree topology, ( ) five classes of switching centers.a. organizing, consistingb. organize, consist ofc. to organize, consisting ofd. to organize, to consist of答案：cIV.根据课文内容选择正确答案1.The integrated services digital network is the road map to the future for ( ).A.all forms of data communicationsB.all forms of digital communicationsC.all voice conversationsD.all personal communications答案：B2. The digital service offered the public carriers three very appealing characteristics: ( ) , economy, and flexibility.A. social abilityB. great capacityC. high speedD. enhanced quality答案：D3. As regards economy, early studies suggested that digital services offered significant advantages since the substantial quantity of interface equipment in the telephone exchange ( ).A. could be eliminatedB. could be usedC. could be decreasedD. could be widely used答案：A4. Today two 64 kbit/s, or 2B-channels coupled with a basic access signaling rate of 16 kbit/s, the D-channel, constitute ( ).A.the information superhighwayB.the local area networkC.the essential ISDN transmission rateD.the synchronous digital hierarchy答案：C5. Currently PSTN offers universal voice access to almost 750 million telephone around the world. ISDN is the network which will provide a similar universal access for ( ).A.voice service as wellB.not only voice but data, video, text, and other services as wellC.any analog information including voiceD.high speed data service答案：B6. The public telecommunications network can be described ( ).ing twisted pair of wiresing many thousands of subscribersing four generic architectural componentsing switching nodes答案：C7. The local loop is a pair of wires, generally twisted pair, that ( ).A.connects a subscriber to one of the nodes in the networkB.connects trunk in the networkC.attaches to the toll centerD.attaches to the primary center答案：A8. If the two subscribers are under the aegis of different regional centers, the circuit ( ).A.will involve a digital data systemB.will involve a trunk between regional centersC.will involve a PBX facilityD.will involve many end offices答案：B9. Each subscriber c9onnects via local loop to a switching center, known as ( ).A. a regional centerB. a tandem switchC. an end officeD. a telephone network答案：C10. There are over 19,000 end offices in the United States, so it is clearly impractical ( ).A.for each end office to have a direct link to each other end officeB.for the US to build so many switching centersC.for each end office to provide video serviceD.for each end office to support many thousands of subscribers答案：A11. With the introduction of digital data system, some subscribers that ( ) have been incorporated into the network.A.can provide video serviceB.transmit broadband programC.contain a transmitter and receiverD.transmit digital signals答案：D12. ( ) , a total path of connected lines is set up from the origin to the destination at the time the call is made, and the path remains allocated to the source-destination pair until it is released by the communication parties.A. In message switchingB. In packet switchingC. In circuit switchingD. In digital switching答案：C13. In message switching, the transmission unit is a well defined block of data called a message. In addition to the text to be transmitted, a message comprises ( ).A. a start and end of dataB. a header and checksumC. a start and a stop bitD. a transmitter and receiver答案：B14. A variation of message switching is packet switching. Here the message is broken up into several pieces of a given maximum length, ( ).A. called informationB. called textsC. called packetsD. called messages答案：C15. The header of a message contains information regarding ( ); the checksum is used for error control purposes.A. the text to be transmittedB. the source and destination addressesC. the voice channelsD. many packets between two computers答案：B16. With circuit switching, there is always an initial connection cost incurred in setting up the circuit. It is cost-effective only in those situations where once the circuit is set up ( ).A.the voice conversation beginsB.there is no any intervention on the part of the subnetC.there is a message to be transmittedD.there is a guaranteed steady flow of information transfer答案：D17. A major problem facing the radio communication industry is the limitation of ( ).A.the LSI technologyB.the poor service performanceC.the available radio frequency spectrumD.the size of the mobile transceivers答案：C18. Large-Scale Integrated circuit technology reduced ( ) so that they easily fit into the standard automobile.A.the costs of the transceiversB.the size of mobile transceiversC.the number of the channelsD.the frequency band of the transceiver答案：B19. A basic cellular system consists of three parts: a mobile unit, ( ).A.a cell site, and a mobile telephone switching officeB.a cellular processor and a cellular switchC.a control unit and a power plantD.an antenna and a data terminal答案：A20. Each mobile unit can only use one channel at a time for its communication link, ( ).A.the channel is fixed when the call is madeB.but the channel is not fixedC.and the channel is a high-speed data linkD.and many mobile units use the same channel答案：B21. The cellular switch, which can be either analog or digital, switches calls ( ).A.to connect mobile subscribers to the nationwide telephone networkB.to connect fixed telephone subscribers to one anotherC.to link together many fixed telephone usersing the microwave radio links答案：A22. People on the ARPNET quickly discovered that they could ( ) .municate to one another by telephoneB.exchange messages and conduct electronic “conferences” with distantC.conduct data communicationsD.get all kinds of information services, such as science, education答案：B23. Today thousands of network and millions of computers are connected to the Internet. It is growing so quickly ( ) how many users “On the Net”.A. that anybody knowsB. that you can tell usC. that anyone can say exactlyD. that nobody can say exactly答案：D24. The Internet is an international collection of computer networks that ( ), connected together through backbone systems.A.all understand a standard system of addresses and commandsB.all have the bridges and gatewaysC.all use the same addresses and the serversD.all understand importance of communications答案：A25. The Internet is the largest repository of information which can provide very very large network resources. The network resources can be divided into ( ).munication resources and computer resourcesB.servers resources and bridges resourcesC.facilities resources and information resourcesD.hardware resources and software resources答案：C26. As more and more systems join the Internet, and as more and more forms of information can be converted to digital form , ( ).A.the amount of stuff available to Internet users continues to growB.the Internet becomes very busyC.the number of Internet users becomes very largeD.the information in Internet is shared by more people.答案：A27. Before you can use the Internet, you must ( ).A.understand the regulations of the InternetB.choose a way to move data between the Internet and your PCC.install a serverD.study the concept of the communications答案：B28. ( ) is a networked hypertext protocol and user interface.A. Asynchronous serial interfaceB. E-mailC. InternetD. World wide web答案：D29. If the signal is very large compared to the noise level, then ( ).A.the signal-to-noise ratio is poorB.a perfect message can take placeC.it’s a terrestrial systemD.the noise power is very strong答案：B30. If we consider binary transmission, the complete information about a particular message will always be obtained ( ).A.by detecting the shape of the transmitted signalB.by detecting the level of the transmitted signalC.by calculating the parameters of the transmitted signalD.by detecting the presence or absence of the pulse答案：D31. At the receive terminal ( ) to separate the 8-digit sequences into the appropriate channels.A. PCM is usedB. a demultiplexer is neededC. the frame code is arrangedD. the coder is required答案：B32. It is ( ) which is of the most interest to the communication engineer.A.the method for overcoming noisy environmentsB.the relationship of the true signal to the noise signalC.the binary transmissionD.the quality of the transmission。

通信专业英语之示波器

Translation of Text 5
The signal also travels to the trigger system to start or trigger a "horizontal sweep". Horizontal sweep is a term referring to the action of the horizontal system causing the glowing dot to move across the screen. Triggering the horizontal system causes the horizontal time base to move the glowing dot across the screen from left to right within a specific time interval.
示波器的触发：使用“触发电平”控制键稳定重复显示的信号。
Translation of Text 9
Also, adjusting the focus and intensity controls enables you to create a sharp, visible display. Fig. 8-3 is diagram of oscilloscope’s panel.
The triggering of the oscilloscope. Use the trigger level to stabilize a repeating signal.
Translation of Text 8
时基：使用“sec/div”控制键，设置屏幕水平方向每格所代表的时间长短。
Translation of Text 3

通信英语第六版课后答案

通信英语第六版课后答案1、Tom sits _______ Mary and Jane. [单选题] *A. amongB. between(正确答案)C. onD. next2、2．The villagers want to have a bridge. Can this dream ________? [单选题] * A．come outB．get awayC．come true(正确答案)D．get out3、The people’s Republic of China _______ on October 1, 1 [单选题] *A. foundB. was founded(正确答案)C. is foundedD. was found4、--What’s the _______ like today?--Cloudy. [单选题] *A. skyB. airC. landD. weather(正确答案)5、Is there ____ for one more in the car? [单选题] *A. seatB. situationC. positionD. room(正确答案)6、All he _______ was a coat. [单选题] *A. had on(正确答案)B. had toC. had a restD. had a good time7、My dog is very _______. It is safe to touch it if you want to. [单选题] *A. luckyB. deliciousC. friendly(正确答案)D. helpful8、He usually ________ at 6:30 a.m. [单选题] *A. gets toB. gets up(正确答案)C. gets overD. gets in9、( ) Some students preferred to stay in the toilet ______ do morning exercises. [单选题] *A in order to notB in not order toC in order not to(正确答案)D not in order to10、I usually do some ____ on Sundays. [单选题] *A. cleaningsB. cleaning(正确答案)C. cleansD. clean11、98．There is a post office ______ the fruit shop and the hospital. [单选题] * A．atB．withC．between(正确答案)D．among12、Mr. Bliss became the first person to die in a car accident. [单选题] *A. 事故(正确答案)B. 竞赛C. 检阅D. 交易13、Don’t swim in the river. It’s too _______. [单选题] *A. interestingB. easyC. difficultD. dangerous(正确答案)14、They all choose me ______ our class monitor.（）[单选题] *A. as(正确答案)B. inC. withD. on15、So many people will _______ to their work after the Spring Festival. [单选题] *A. get inB. get onC. get offD. get back(正确答案)16、Sometimes only（）10 out of 500 or more candidates succeed in passing all the tests. [单选题] *A. as many asB. as few as(正确答案)C. as much asD. as little as17、—Why do you look so ______?—Our team won the basketball match!（）[单选题] *A. angryB. excited(正确答案)C. nervousD. unfair18、32．There are about __________ women doctors in this hospital. [单选题] *A．two hundred ofB．two hundreds ofC．two hundredsD．two hundred (正确答案)19、The man lost his camera and he ______ it now.（）[单选题] *A. foundB. is findingC. is looking forD. looks for(正确答案)20、We got up early this morning and took a long walk after breakfast. We walked _____ the business section of the city. [单选题] *A. amongB. betweenC. through(正确答案)D. upon21、( ) Do you have any difficulty _____ these flowers？I’d like to help you if you need.[单选题] *A in planting(正确答案)B for plantingC with plantingD to plant22、What surprised me ______ was that he succeeded. [单选题] *A. most(正确答案)B. mostlyC. almostD. at most23、He _______ getting up early. [单选题] *A. used toB. is used to(正确答案)C. is usedD. is used for24、75．Why not________ for a walk? [单选题] *A．go out(正确答案)B．to go outC．going outD．goes out25、In 2019 we moved to Boston,（）my grandparents are living. [单选题] *A. whoB. whenC. where(正确答案)D. for which26、He gathered his courage and went on writing music. [单选题] *A. 从事B. 靠······谋生C. 继续(正确答案)D. 致力于27、( )He killed the enemy guard and made away _________the villagers. [单选题] *A. with the helpB. with helpC. with help ofD. with the help of(正确答案)28、Don’t _______. He is OK. [单选题] *A. worry(正确答案)B. worried aboutC. worry aboutD. worried29、If we want to keep fit, we should try to _______ bad habits. [单选题] *A. keepB. haveC. getD. get rid of(正确答案)30、Last week they _______ in climbing the Yuelu Mountain. [单选题] *A. succeeded(正确答案)B. succeedC. successD. successful。

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GMDSS通信英语练习题Part One The Introduction of GMDSS01. The radio equipment to be carried on board GMDSS ship depends upon _____________A. Gross tonsB. kind of the shipC. sea areaD. A+B02. Which of the following indicates that a station transmit concerning navigation safety messages by radiotelephone?A. MAYDAYB. PAN PANC. SECURITED. SAFETY03. Which of the following indicates a grave and imminent danger requesting immediate assistance on the radiotelephone?A. MAYDAYB. PAN PANC. SECURITED. SAFETY04. If we pass this test it may be possible for us to obtain .A. First-class Radioelectronic CertificateB. Second-class Radioelectronic CertificateC. General Operator’s CertificateD. Restricted Operator’s Certificate05. All the distress message should be preceded by ______.A. MAYDAYB. PAN PANC. SECURITED. SAFETY06. The sea area A3 will be within the coverage of .A. MF Coast StationB. VHF Coast StationC. Inmarsat satellitesD. COSPAS/SARSAT07. Urgency message should be preceded by .A. PAN PANB. MAYDAYC. SECURITED. SOS08. Which of the following equipment does not belong to GMDSS?A. EPIRBB. GPSC. DSCD. Inmarsat-F09. The equipment carriage requirement of the ships which sea area can be summarized as: carry VHF equipment andeither a satellite EPIRB or a VHF EPIRB?A. A1B. A2C. A3D. A410. ―CHANGED ETD PILOT STN‖ means .A. ETD is not changedB. ETD has changedC. ETA has changedD. ETA is not changed11. What is AAIC of traffic system in China?A. CN01B. CN02C. CN03D. CN0412. Which equipment is required to be carried in various sea areas?A. VHFB. MFC. HFD. MES13. Which of the following description about Sea Area A3 is correct?A. an area within the radiotelephone coverage of at least one VHF coast station and one MF coast stationB. an area, including Sea Area A1 and A2, within the coverage of an INMARSAT geostationary satellite.C. An area, excluding Sea Area A1 and A2, within the coverage of an INMARSAT geostationary satellite.D. An area, excluding Sea Area A1 and A2, within the coverage of an COSPAS—SARSAT system.14. The following radio communication systems are used in GMDSS except .A. the INMARSAT system.B. VHF MF and HF terrestrial systemsC. the COSPAS-ASRSAT systemD. the FLAG SIGNAL systems15. Which of the following frequency is NOT used for GMDSS?A. 2182 KHzB. 500 KHzC. 518 KHzD. 2187.5 MHz16. ―MENED ETA PILOT STA TION‖ means .A. ETA pilot station has been changed.B. ETA pilot station will be given afterwards.C. ETA pilot station was not given.D. ETA pilot station was given.17. Which frequency band does the 518 kHz belong to?A. LFB. MFC. HFD. VHF18. GMDSS is the abbreviation ofA. The Global Maritime Distress and Safety SystemB. The Global Mariners Distress and Safety SystemC. The Global Marines Distress and Safe SystemD. The Global Marines Disco and Safe System19. If we only want to sail in A1, which certificate will fit for us?A. the First-class Radioelectronic CertificateB. the Second-class Radioelectronic CertificateC. the General Operator’s CertificateD. the Restricted Operator’s Certificate20. Both the satellite communication and terrestrial communications will _________.A. not be used in the GMDSSB. be used only for general communicationsC. be replaced by MorseD. be used in the GMDSS21. The medical message should be preceded by the word ________.A. OBSB. TMZC. MEDICOD. NW22. The date for entry into full effect for GMDSS is 1st February _______.。

A. 1999B. 1992C. 1995D. 199723. How does the GMDSS enable a ship in distress to send a message?A. in many waysB. in a wayC. only by DSCD. only by Inmarsat24. In the case of a ship in Sea Area A4, the primary means of ship-to-shore distress alerts would have tobe .A. VHF DSCB. HF DSCC. 406 MHz EPIRBD. Inmarsat-C25. The primary functions of the GMDSS is .A. daily communicationB. bridge to bridge communicationC. MSI broadcastD. distress communication of the distress ships.26. If we want to communicate with Guangzhou station by RT, we find out the channel of the station in theADMIRALTY LIST OF RADIO SIGNALS .A. V olume 1B. Volume 2C. Volume 3D. V olume 427. What kinds of ships may not comply with SOLAS convention?A. cargo ships less than 300 tonsB. cargo ships more than 300 tonsC. Passenger ships sails on international serviceD. B&C28. Every ship shall be provided with a VHF radio installation capable of transmitting and receiving on .A. CH 70 and CH 16B. CH06C. CH 13D. all of above29. The ―on-scene‖ frequency 3 023 kHz for radiotelephone is used for communication.A. ship-aircraftB. inter shipsC. ship-shoreD. bridge-bridge30. Who have primary responsibility for radio communications during distress incidents?A. the first mateB. the second mateC. the captainD. the operator31. The call sign of coast stations of China are between .A. BAA-BZZB. XSA-XSZC. HA-3UZD. AAA-AZZ32. Availability of radio equipment maintenance options onboard in A3 is .A. at-sea maintenanceB. shore-based maintenanceC. duplication of equipmentD. nominate two options of above33. Regulation of the GMDSS applies to .A. all cargo ships above 300 gross tonsB. all passenger ships on international voyagesC. all shipsD. A&B34. Which device has not the function of alerting?A. EPIRBB. SARTC. MESD. DSC35. The GMDSS supports two independent systems for broadcasting MSI, viz :A. NA VTEX & EGCB. SafetyNET & FAXC. Inmarsat-CD. DSC & NBDP36. Which terminal is used to alert to ships by distress vessel?A. EPIRBB. SARTC. MESD. DSC37. When distressed vessel in A4, which terminal is used for routine communication in long range services?A. 406 MHz EPIRBB. Inmarsat-FC. Inmarsat-BD. HF terminal38. Which of the following frequencies is used for international distress and safety frequencies on MF radiotelephony?A. 2,182 KHzB. 2,187.5 KHzC. 2,177.0 KHzD. 2,414.5 KHz39. Which of the following descriptions of usage is suitable for 8,414.5 kHz frequency?A. Distress alerting frequency on HF DSCB. Distress communication frequency on HF RTC. Distress alerting frequency on MF DSCD. Distress communication frequency on HF NBDP40. Which of the following descriptions of usage is suitable for 2,174.5 kHz frequency?A. MF NBDP distress and safety traffic frequencyB. MF TELEPHONE distress and safety traffic frequencyC. MF DSC distress and safety call frequencyD. HF NBDP distress and safety traffic frequency41. The call sign of ship stations of China are between .A. BAA-BZZB. XSA-XSZC. HA-3UZD. AAA-AZZ42. Which of the following frequencies is used for intership MF DSC call?A. 2,182 KHzB. 2,187.5 KHzC. 2,177.0 KHzD. 2,414.5 KHz43. Which frequencies can not be used for ship-aircraft communication?A. CH 06B. 3,023 KHzC. 2,182 KHzD. 5,680 KHz44. If a ship is on fire in the Sea Area A3, which of the following equipments would be used to make ship-to-shoredistress alerts?A. HF DSCB. 406 MHz EPIRBC. Inmarsat-CD. All of above45. To insure the maintenance of radio equipment, the vessel sailing in A1 area should select .A. at-sea maintenanceB. shore-based maintenanceC. duplication of equipmentD. any one of above46. The transition period in implementation of the new GMDSS system is years.A. 6B. 7C. 8D. 947. What is the basic concept of GMDSS?A. Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay.B. Search and rescue authorities shore can be alerted to a distress situation.C. shipping in the immediate vicinity of a ship in distress will be rapidly alerted.D. All of these.48. What statement is generally correct regarding the maintenance requirements for ships under GMDSS?A. shoreside maintenance and scheduled tests and inspections will partially meet this requirement.B. Redundancy of functions of certain equipment will partially meet this requirement.C. On-board maintenance provided by a person holding a GMDSS maintainer license will partially meet therequirements.D. All of the above.49. What is the primary reason GMDSS imposes the carriage requirement for different radio subsystems on vessels?A. Because the different radio subsystems have individual limitation with respect to the geographical coverageand services provided.B. Redundancy in duplicating all operational functions in the event of a system failure.C. Different radio systems may be used by the various authorities.D. The ability to communicate in all modes with any of the shore authorities.50. GMDSS is primarily a system based on .A. VHF digital selective calling from ship to shore.B. Ship-to-ship distress communication using MF or HF radiotelephony.C. The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in distressor in need of assistance.D. Distress, urgency and safety communication carried out by the use of narrow-band direct printing telegraphy.51. is the orbit of a geosynchronous satellite whose circular and direct orbit lies in the plane of theEarth’s equator, and it is approximately 35,700 kilometers above the equator.A. Polar OrbitingB. GPS Satellite OrbitC. Geostationary Satellite OrbitD. The North and South Poles52. is a service which is based on polar orbiting satellites which receive and relay distress alerts fromsatellite EPIRBs and which provides their position.A. Inmarsat Satellite ServiceB. Polar Orbiting Satellite ServiceC. GPS Satellite ServiceD. NNSS Satellite Service53. includes navigational and meteorological warnings, meteorological forecasts and other urgentsafety related messages broadcast to ships.A. Distress trafficB. Urgency communicationC. Public correspondenceD. Maritime Safety Information54. is an area, outside A1, A2, A3, which mostly in the North Pole Area (as the area near to South Pole ismostly land)A. Sea Area A1B. Sea Area A2C. Sea Area A3D. Sea Area A455. What system provides accurate vessel position information to the GMDSS equipment?A. GPSB. Cospas-SarsatC. InmarsatD. NBDP56. Which of the following is a functional or carriage requirement for compulsory vessels?A. A compulsory vessel must carry at least two (2) licensed GMDSS operators.B. A compulsory vessel must satisfy certain equipment carriage requirements that are determined by where thevessel sails.C. A compulsory vessel must be bale to transmit and respond to distress alerts.D. All of the above.57. GMDSS-equipped ships will be required to perform which of the following communications functions?A. Distress alerting and maritime safety information.B. Search and Rescue coordination and on-scene communications.C. Bridge-to-bridge and general radio communications.D. All of these58. Which of the following is required GMDSS function?A. Transmit and receive locating signalsB. Transmit and receive general communications.C. Bridge-to-bridge communications.D. All of the above59. What statement is generally correct regarding the maintenance requirements for ships under GMDSS?A. Redundancy of functions of certain equipment will partially meet this requirement.B. On-board maintenance provided by a person holding a GMDSS Maintainer’s license will partially meet therequirements.C. shoreside maintenance and scheduled tests and inspections will partially meet this requirement.D. All of the above.60. GMDSS began a phased implementation on Feb .A. 1999B. 2000C. 1992D. 200261. The GMDSS defines sea area based on the location and capacity of shore based communication facilities.A. threeB. sixC. fiveD. four62. In addition to meeting the requirement of Sea A1 and A2, every ship engaged on voyage in Sea area A3 shall beprovided with _____ .A. MF radio installation with DSCB. MES or HF with DSCC. MF/HF radio telephone installationD. 2187.5 kHz watch receiver63. Every ship must be fitted with SART and two-way VHF radio telephone.A. 1,2B. 2,3C. 2,1D. 3,264. The communication arrangements are designed to enable distress alerting to be performed in all three directions:in all Sea Areas.A. east, west, southB. ship, shore, crewC. ship-to-shore, ship-to-ship, shore-to-shoreD. ship-to-shore, ship-to-ship, shore-to-ship65. For ship-to-shore distress alerts, you can use .A. Inmarsat, EPIRB and DSCB. NA VTEX, NBDP and R/TC. Inmarsat, VHF and SARTD. EPIRB, DSC and RADAR66. Ships which operate in area A4 will have to carry_____A. HF equipmentB. MF,VHF equipment and SESC. INMARSAT equipmentD. EGC receiver67. are used for distress alerting as a rule.A. MES/DSC/EPIRBB. SART/radio telephoneC. COSPAS-SARSATD. both A and C68. Besides distress alerting, the GMDSS can also provide communication.A. urgencyB. safetyC. Broadcast of MSID. All of A,B and C69. According to the basic concept of the GMDSS, distress alerting can be sent by to SAR authorities ashoreor ships in vicinity of a distress incident.A. either satellite or terrestrial communicationB. only satellite communicationC. only terrestrial communicationD. VHF DSC or MES70. On-Scene communications will be between and .A. the ship in distress / SARB. the ship in distress / RCCC. the ship in distress / vessel in vicinityD. the ship in distress / assisting units71. Every ship, while at sea, shall be capable of__________.A. transmitting and receiving search and rescue co-ordination communicationB. transmitting and receiving on-scene communicationC. transmitting and receiving bridge-to-bridge communicationsD. A, B, C are all right72. If operating within Ocean Area A1, and outside of NA VTEX coverage, a GMDSS-equipped vessel mustcarry .A. An Inmarsat-A terminalB. A GPS receiverC. Equipment capable of maintaining a continuous DSC watch on 2,187.5 kHz.D. Equipment capable of reception of maritime safety information by the Inmarsat enhanced group call system,or HF NBDP.73. What information should be included in a distress follow on voice transmission?A. Ship’s Name and Call SignB. Ship’s positionC. Ship’s MMSI numberD. All of the above74. What action should you take after sending a false distress alert on VHF?A. Send a DSC cancellation message on CH70B. Make a voice announcement to cancel the alert on CH16C. Make a voice announcement to cancel the alert on CH13D. Make a voice announcement to cancel the alert on CH2275. What action should you take after sending a false distress alert on MF?A. Make a voice announcement to cancel the alert on 2,187.5 kHz.B. Make a voice announcement to cancel the alert on 2,174.5 kHz.C. Make a voice announcement to cancel the alert on 2,182.0 kHz.D. Send another DSC alert and follow on with voice on 2,182.0 kHz.76. What action should you take after sending a false distress alert on 8 MHz?A. Make an ―ALL SHIPS‖ call on all 5 HF telex channels canceling the alert.B. Make an ―ALL SHIPS‖ call on 8,291.0 kHz canceling the alert.C. Make an ―MAYDAY‖ call on 8,414.5 kHz canceling the alert.D. Make an ―URGENT‖ call on 8,614.0 kHz canceling the alert.77. Which of the following frequencies and modes is allocated for distress alerting in GMDSS?A. 406 MHz to via EPIRBB. 1,626.5 ~1.645.5 MHz via InmarsatC. Channel 70 DSC plus six (6) MF/HF DSC frequenciesD. All of the above78. Which of the following frequencies have been designated for ―on-scene‖ communications in the Global MaritimeDistress and Safety System?A. VHF CH 22B. HF radiotelephone on 21.820MHzC. NBDP on 2177.0 KHz and VHF CH 16D. VHF CH 16 and NBDP on 2174.5 KHz79. SafetyNET messages can be received by which of the following shipboard equipment?A. NA VTEX.B. MF and HF NBDP.C. EGC receiver.D. All of these80. consists of all messages relating to the immediate assistance required by the ship in distress,including SAR communication and signals for locating.A. Distress trafficB. Routine communicationC. Port operation trafficD. Public correspondencePart Two The Satellite Communication System01. The following number is Inmarsat-C MES’s number, which one is Chinese vessels? _____________A. 421256545B. 441212345C. 415701234D. 41241234502. If we want to cancel the false alert to RCC, we should find out the telephone number of the RCC in theADMIRALTY LIST OF RADIO SIGNALS .A. V olume 2B. Volume 3C. Volume 4D. V olume 503. The EGC service is composed of .A. SAFETY NETB. FLEET NETC. DA TA REPORTD. A&B04. Which of the following are included in mandatory services LES of Inmarsat-C?A. FleetNETB. NBDPC. DSCD. SafetyNET05. Which of the following statements about Distress call is correct?A. Distress call is only available on fleet 77 systemsB. Distress call is only available on fleet 55 systemsC. Distress call is only available on fleet 77 /55/33systemsD. Both A and B06. The difference between the mobile ISDN and MPDS is that .A. The mobile ISDN is charged by connecting time and MPDS is charged by Mbits transferred.B. The mobile ISDN is charged by Mbits transferred and MPDS is charged by connecting time.C. There is no difference between the mobile ISDN and MPDSD. The communication fee of the mobile ISDN is inexpensive than that of MPDS07. Which of the following IMN is used for Inmarsat-F MES voice service?A. 76×××××××B. 60×××××××C. 3412×××××D. 66×××××××08. Which type of the following service is excluded from Inmarsat-F services?A. telephoneB. high speed data transmissionC. telexD. E-mail09. The PIN becomes blocked if the PIN code is entered incorrectly several times when operating capsat F77 MES.The maximum of input isA. 4B. 5C. 6D. 310. Which of the following ID number is used for BEIJING LES telephone access code in AOR-E?A. 118B. 868C. 311D. 21111. Which terminal equipment of ship is for COSPAS/SARSAT system?A. EPIRBB. Inmarsat-CC. SARTD. EGC12. COSPAS-SARSAT is intended to be used for .A. Distress alarm and locatingB. Daily communicationC. Send messagesD. E-mail13. The low polar orbiting satellite system provides the coverage of .A. A1B. A1 + A2 +A3C. A4D. A1 + A2 +A3 + A414. Which service does not EGC have?A. N/WB. MSIC. SafetyNETD. FAX15. Where is the geostationary orbit of Inmarsat situated?A. equator orbitB. pole orbitC. oblique orbitD. A&B16. Which frequency is used on line from LES to satellite in the Inmarsat system?A. 4 GHzB. 6 GHzC. 1.6 GHzD. 1.4 GHz17. Which frequency is used on line from MES to satellite in the Inmarsat system?A. 4 GHzB. 1.6 GHzC. 1.4 GHzD. 6 GHz18. Which number of the following Inmarsat-C ID number is the ID number distributed to Chinese vessel―VICTORY‖?A. 494601513B. 404120000C. 441258112D. 04126004119. Which is the Inmarsat-C LES access code of MCN (Beijing) in POR?A. 211B. 311C. 868D. 21020. Which 2 digit code is Medical Assistance offered by all LES as specified in the Radio Regulations underGMDSS?A. 32B. 38C. 39D. 4121. Please choose the Inmarsat-C NCS ID of the AOR-W .A. 044B. 001C. 211D. 14422. Which type of MES of Inmarsat does not have the telex service?A. Inmarsat-AB. Inmarsat-BC. Inmarsat-CD. Inmarsat-F23. Where is the Inmarsat’s headquarters?A. ChinaB. the U.S.A.C. the United KingdomD. Canada24. The ground segment of Inmarsat consist of .A. Land Earth StationsB. Network Co-ordination Stations.C. Network Operations CentreD. A. B and C25. Which of the following are usually used for distress alerting by Inmarsat-C?A. directly press the distress button on the panelB. pick up phone and report distress information to RCCC. send distress information by satellite EPIRBD. send telex to LES26. How many Geostationary satellites are employed in the Inmarsat?A. 3B. 4C. 5D. 627. COSPAS-SARSAT can not fulfill the function ofA. determining the position of a distress vesselB. distress communicationC. distress alerting and position-fixing in Area A4D. both A and C28. The Inmarsat satellites are controlled by .A. NOCB. LESC. NCSD. SCC29. Where is the distress alerting made by MES in the Inmarsat system passed to?A. MCCB. RCCC. MESD. NCS30. Before the communication, the Inmarsat-C MES must login of the local ocean region.A. dominated MES by NCSB. RCCC. anyone of the MESD. NCS31. In the Inmarsat system, the services code 00 meansA. position reportB. relay serviceC. automatic serviceD. medical advice32. Which service is a more cost-effective solution for applications where there is no need for constant transmissionof data in both directions?A. ISDNB. MPDSC. ISDLD. CDMA33. The command of breaking the radio connection of the Inmarsat-B telex service isA. NNNNB. ·····C. KKKKD. OVER34. The distress message of the Inmarsat-C radiotelex does not include the information ofA. the time of distressB. the nature of distressC. the position of distressD. the number of the distress people35. The Inmarsat Mobile Number (IMN) has digits except Inmarsat-A MES.A. 7B. 9C. 10D. 336. Communication using fax of Inmarsat-F, the country code of China isA. 868B. 11C. 86D. 8537. Which institution monitor and control the communications traffic of the LES within the Ocean Region?A. RCCB. NCSC. NOCD. MCC38. Which orbit is the COSPAS-SARSAT satellite situated?A. equator orbitB. pole orbitC. oblique orbitD. A&B39. Which equipment does not belong to COSPAS-SARSAT system?A. EPIRBB. SARTC. PLBD. ELT40. Which type of Inmarsat Mobile Earth Station terminal is approved by the GMDSS?A. Inmarsat-CB. Inmarsat-MC. Inmarsat-mini-MD. Inmarsat-F5541. Which institute processes the signals to determine the beacon location?A. MCCB. RCCC. LUTD. NCC42. When a vessel in distress making on-scene communications, which one of the following radio equipment can beused?A. VHFB. MF/HF radio equipmentC. Inmarsat MESD. All of above43. Any ships fitted with MES can and through the satellite system when sending a distress alert.A. enter the system/contact an RCCB. access to Inmarsat/establish contact with a LESC. have absolute priority to enter the system/make contact with a LESD. enter the system gradually/wait for rescue44. Where does the RCC of China locates in?A. BeijingB. ShanghaiC. DalianD. Tianjin45. Which of the following optional equipment can be used by a ship in Area A3 for ship to shore distress alerting?A. VHF DSCB. MF DSCC. Inmarsat MESD. VHF CH70 EPIRB46. The maritime access code for the IOR is Inmarsat-C Telex Service.A. 581B. 582C. 583D. 58447. In Inmarsat-C, ―priority 0‖ means communication.A. routineB. distressC. urgencyD. safety48. The maritime access code of telephone mode in Inmarsat-F terminal for the AOR (E) isA. 871B. 870C. 581D. 58049. Which Inmarsat system applies store-and-forward messaging?A. Inmarsat-AB. Inmarsat-CC. Inmarsat-BD. Inmarsat-M50. The Inmarsat SafetyNET services coversA. the whole worldB. all NavareaC. areas from A1 to A4D. only four Inmarsat regions51. Sea Area A3 is an area within the coverage of _____in which continuous alerting available.A. VHF stationsB. MF/HF stationsC. Radio stationsD. Inmarsat stations52. The NCS of Inmarsat-C system in the AOR (E) is in .A. Goonhilly, UKB. Yamaguchi, JapanC. Perth, AustraliaD. Southbury, USA53. An MES operator can choose the most suitable LESs according to .A. The routing agreement for a particular ocean regionB. The communication service he requiredC. The position of his ship and the LESsD. B and C54. In Inmarsat-B service code "32‖ means .A. Medical assistanceB. Medical adviceC. Maritime assistanceD. Technical assistance55. What is the primary function of a NCS?A. To monitor and control communications through the Inmarsat satellite for which it is responsibleB. To provide direct communications between the Inmarsat station placing a call and the station receiving thecallC. To provide multi-mode communications between the Inmarsat station placing a call and the coast radiostation that will deliver itD. To determine which satellite is best suited to provide communications between the Inmarsat station placing acall and the station receiving the call56. How does a distress message normally initiated through Inmarsat?A. All Inmarsat units have a dedicated key that can be pressed for immediate actionB. By adding the word ―DISTRESS‖ in the first line of the message’s preambleC. Certain Inmarsat unit have a dedicated key that can be pressed for immediate action, while other systemsprovide menu-driven featuresD. By transmitting the distress message on the U.S. Coast Guard’s dedicated monitoring channel57. How will communication fee of Inmarsat-C be paid?A. In accordance with duration of communicationB. In accordance with size of message transferredC. Same as billing method of telecommunication of radio coast stationsD. Same as billing method of Inmarsat-B58. Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to afax machine number (045) 334-5678 in Japan (voice country code 81)?A. 810453345678#B. 81 (045) 3345678C. 810453345678D. 81 (045) 334-567859. Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications toshoreside telex terminal number 45992 in Taiwan (telex country code 769)?A. (769) 45992B. 76945992+C. 76945992D. None of the above60. It is possible to transmit all of the following via Inmarsat-C from a vessel except?A. TelexB. Text for delivery by FaxC. V oiceD. Comtex mail and x.400 data service61. Inmarsat-C provides for which of the following?A. Polling, enhanced group call, one-way position and data reporting via satellite.B. FM voice communications via satellite.C. Two-way messaging and data communication on a store-and-forward basis.D. Polling, enhanced group call, one-way position and data reporting via satellite, two-way messaging and datacommunications on a store-and-forward basis.62. Which mode of communications is possible through an Inmarsat-F MES?A. SITORB. TelexC. TelephoneD. DSC63. Which of the following best describes a shipboard Inmarsat-F MES?A. A satellite communications system that provides real-time connectivityB. A small, lightweight terminal capable of providing satellite store-and-forward message communicationsC. A small, lightweight terminal used to transmit messages over high frequency (HF) bands to communicatethrough a satelliteD. A satellite communications system that also provides continuous Digital Selective Call coverage for all oceanregions64. Which of the following best describes Inmarsat-C operation?A. Is an analog-based system。

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