专业英语词汇(1)

1、信信噪噪比比 SNR脉脉冲冲编编码码调调制制 PCM脉脉冲冲位位置置调调制制PPM信信道道容容量量 信信源源信信宿宿消消息息序序列列光光强强三三维维声声音音传传输输 抽抽样样，压压缩缩，量量化化，编编码码 双双绞绞线线同同轴轴电电缆缆无无线线电电频频带带光光束束离离散散系系统统 离离散散信信号号离离散散变变量量连连续续的的 混混合合的的 幅幅度度 频频率率 相相位位 调调制制信信号号天天线线已已调调信信号号数数字字调调制制模模拟拟调调制制二二进进制制比比特特流流幅幅度度键键控控 ASK频频移移键键控控 FSK相相移移键键控控 PSK基基带带信信号号频频分分复复用用FDM载载波波频频率率 路路径

2、径损损耗耗绕绕射射反反射射散散射射长长波波短短波波超超短短波波幅幅度度调调制制 AM频频率率调调制制 FM相相位位调调制制 PM同同步步频频谱谱效效率率功功率率效效率率强强健健稳稳定定多多径径传传播播二二进进制制频频移移键键控控2FSK连连续续相相位位调调制制CPM锁锁相相环环PLL最最小小频频移移键键控控MSK采采样样频频率率数数字字信信号号处处理理DSP时时分分复复用用TDM模模数数转转换换ADC多多址址接接入入 频频分分多多址址 FDMA保保护护频频段段空空分分多多址址 SDMA时时分分多多址址 TDMA蜂蜂窝窝移移动动通通信信码码分分多多址址 CDMA扩扩频频多多址址 SSMA跳跳频频

3、直直接接序序列列全全球球移移动动通通信信系系统统GSM蓝蓝牙牙无无线线电电系系统统频频分分双双工工FDD时时分分双双工工TDD下下行行时时隙隙上上行行时时隙隙伪伪随随机机模模式式复复用用器器解解复复用用器器公公共共电电话话交交换换网网PSTN波波分分复复用用 WDM密密集集型型波波分分复复用用DWDM正正交交频频分分复复用用OFDM电电路路交交换换 专专用用线线路路 透透明明的的用用户户级级交交换换机机PBX程程控控交交换换机机用用户户 用用户户线线 本本地地环环路路用用户户环环路路交交换换端端局局中中继继线线 路路由由汇汇接接局局分分组组交交换换 抖抖动动异异步步传传输输模模式式ATM综综合

4、合业业务务数数字字网网ISDN局局域域网网 LAN美美国国电电气气电电子子工工程程师师协协会会IEEE物物理理层层 数数据据链链路路层层 介介质质控控制制访访问问子子层层载载波波监监听听多多路路访访问问/冲冲突突检检测测CSMA/CD总总线线拓拓扑扑 树树形形拓拓扑扑 环环形形拓拓扑扑 星星形形拓拓扑扑 循循环环预预约约竞竞争争接接入入点点无无线线保保真真WiFi热热点点广广域域网网WAN城城域域网网MAN网网络络接接入入点点NAPs互互联联网网交交换换点点IXPs层层次次上上的的系系统统网网络络体体系系结结构构SNA开开放放互互联联系系统统模模型型OSI应应用用层层 传传输输层层 文文件件传

5、传输输协协议议FTP传传输输控控制制协协议议 TCP用用户户数数据据报报协协议议 UDP网网际际层层 网网络络接接口口层层 高高清清电电视视 HDTV压压缩缩 解解压压 可可变变长长度度编编码码VLC莫莫尔尔斯斯编编码码哈哈夫夫曼曼编编码码冗冗余余无无损损压压缩缩 有有损损压压缩缩 联联合合图图像像专专家家组组JPEG移移动动图图像像专专家家组组MPEG只只读读存存储储器器ROM实实时时图图像像视视频频点点播播VOD多多媒媒体体运运营营支支撑撑系系统统OSS服服务务订订购购服服务务保保证证计计费费功功能能服服务务质质量量 QoS多多播播协协议议无无关关组组播播鉴鉴定定授授权权识识别别游游牧牧数

6、数字字版版权权管管理理DRM会会话话管管理理实实时时协协议议实实时时控控制制协协议议流流控控制制传传输输协协议议STB机机顶顶盒盒基基本本速速率率接接口口 BRI基基群群速速率率接接口口 宽宽带带综综合合业业务务数数字字网网 信信道道绑绑定定终终端端适适配配器器TA接接通通挂挂断断非非对对称称数数字字用用户户线线 ADSL光光纤纤衰衰减减损损耗耗中中继继器器距距离离光光电电调调制制器器声声光光调调制制器器雪雪崩崩光光电电二二极极管管APDPIN本本征征光光电电二二极极管管PIN低低传传传传输输损损耗耗光光放放大大器器 电电介介质质波波导导绝绝缘缘体体阶阶跃跃光光纤纤 渐渐变变光光纤纤 横横向向

7、电电场场TE横横向向磁磁场场TM单单模模光光纤纤 多多模模光光纤纤 国国际际漫漫游游频频谱谱效效率率移移动动台台 MS基基站站收收发发台台 BTS基基站站控控制制器器 BSC基基站站子子系系统统 BSS移移动动交交换换中中心心 MSC鉴鉴权权中中心心 AUC访访问问位位置置寄寄存存器器 VLR设设备备识识别别寄寄存存器器 EIR国国际际移移动动设设备备识识别别号号IMEI本本地地位位置置寄寄存存器器 HLR网网络络交交换换子子系系统统NSS越越区区切切换换 扩扩频频窄窄带带干干扰扰背背景景噪噪声声带带通通滤滤波波器器 邻邻道道干干扰扰 信信道道质质量量窄窄带带信信号号同同步步卫卫星星 全全球球

8、卫卫星星系系统统军军用用卫卫星星导导航航卫卫星星全全球球定定位位系系统统 GPS移移动动用用户户连连接接 MUL网网关关链链路路 内内部部卫卫星星链链路路ISL地地球球同同步步卫卫星星轨轨道道 GEO中中距距离离轨轨道道 MEO近近距距离离轨轨道道 LEO椭椭圆圆形形轨轨道道 HEO时时隙隙 TS话话音音拥拥塞塞 数数据据拥拥塞塞 编编码码器器 解解码码器器 编编解解码码器器 signal-to-noise ratiopulse-code modulationpulse position modulationchannel capacityinformation sourcedestinati

9、on of the informationsequence of messageslight intensitythree dimensional sound transmissionsampled，compressed，quantized and encodeda pair of wiresa coaxial cablea band of radio frequencya beam of lightdiscrete systemDiscrete signalDiscrete variablescontinuousmixedamplitudefrequencyphasemodulation s

10、ignalantennasmodulated signalsdigital modulationAnalog modulationbinary bit-streamAmplitude shift keyingFrequency shift keyingPhase shift keyingBaseband signalFrequency division multiplexingCarrier frequencyPath losspenetration of abstaclesreflectionscatteringlong waveshort wavevery short waveamplit

11、ude modulationfrequency modulationphase modulationsynchronizationspectral efficiencypower efficiencyrobustnessmulti-path propagationbinary FSKcontinuous phase modulationPhase locked loopMinimum shift keyingSampling frequencyDigital signal processingTime division multiplexingAnalog digital conversion

12、Multiple accessFrequency division multiple accessthe guard bandSpace division multiple accessTime division multiple accessCellular mobile communication systemsCode division multiple accessSpread spectrum multiple accessFrequency hoppingDirect sequenceGlobal system for mobile communicationsBluetooth

13、radio systemFrequency division duplexTime division duplexDownlink time slotUplink time slotPseudo random patternMultiplexerdemultiplexerPublic switched telephone networkWave division multiplexingDense wavelength division multiplexingOrthogonal frequency division multiplexingCircuit switchingDedicate

14、d lineTransparentPrivate Branch ExchangeProgram controlled switchsubscribersubscriber lineLocal loopSubscriber loopexchangesEnd officeTrunk lineRouteintermediate officePacket switchingjitterAsynchronous transfer modeIntegrated service digital networkLocal area networkAmerican Institute of electrical

15、 and Electronics EngineersPhysical layerData link layerMedia access control sublayerCarrier sense multiple access/collision detectionBus topologyTree topologyRing topologyStar topologyround robinreservationcontentionAccess pointWireless fidelityHot spotWide area networksMetropolitan area networksNet

16、work access pointsInternet exchange pointshierarchicalSystem network architectureOpen Systems Interconnection ModelApplication layerTransport layerFile transfer protocolTransmission control protocolUser datagram protocolInternetwork layerNetwork interface layerHigh definition televisionCompressionde

17、compressionVariable length codingThe Morse codeThe Huffman codeRedundancyLossless compressionLossy compressionJoint Photographic Experts GroupMoving Pictures Experts GroupRead-only memoryReal time imagevideo on demandMultimediaOperation support systemService orderingService assurancebilling function

18、quality of servicesMulticastProtocol Independent MulticastauthenticationauthorizationidentifynomadicDigital rights managementSession management Real time protocolReal time control protocolStream control transmission protocolSet-top box Basic rate interface Primary rate interfaceBroadband Integrated

19、Services Digital NetworkChannel bondingTerminal adapteron-hookoff-hookAsymmetric digital subscriber lineOptical fiberAttenuation lossRepeater spacingelectro-optic modulatorAcousto optic modulatorAvalanche photodiodepositive-intrinsic negative diodeLow transmission lossoptical amplifiersdielectric wa

20、veguide InsulatorStep Index Fibergraded index fibertransverse electrictransverse magneticsingle mode fibersMultimode Fibersinternational roamingspectral efficiencyMobile StationBase transceiver stationbase station controllerbase station subsystemmobile switching centerauthentication centervisitor lo

21、cation registerequipment identity registerInternational mobile equipment identitiesHome Location RegisterNetwork and Switching SubsystemHandoverspread spectrumnarrow-band interferencebackground noiseband-pass filteradjacent channel interferencechannel qualitynarrow-band signalsgeostationary satellil

22、teglobal satellite systemmilitary satellite satellites for navigationGlobal Positioning SystemMobile users linkgateway linkinter satellite linksgeostationary earth orbitMedium Earth OrbitLow Earth OrbitHighty elliptical orbittime slotvoice trafficdata trafficencoderdecodercodecPIN本本征征光光电电二二极极管管PIN保保

23、护护频频段段背背景景噪噪声声本本地地环环路路本本地地位位置置寄寄存存器器 HLR编编解解码码器器 编编码码器器 波波分分复复用用 WDM采采样样频频率率层层次次上上的的长长波波超超短短波波城城域域网网MAN程程控控交交换换机机抽抽样样，压压缩缩，量量化化，编编码码 传传输输层层 传传输输控控制制协协议议 TCP带带通通滤滤波波器器 单单模模光光纤纤 导导航航卫卫星星低低传传传传输输损损耗耗地地球球同同步步卫卫星星轨轨道道 GEO电电介介质质波波导导电电路路交交换换 调调制制信信号号抖抖动动端端局局短短波波多多播播多多径径传传播播多多媒媒体体多多模模光光纤纤 多多址址接接入入 二二进进制制比比特

24、特流流二二进进制制频频移移键键控控2FSK反反射射访访问问位位置置寄寄存存器器 VLR非非对对称称数数字字用用户户线线 ADSL分分组组交交换换 蜂蜂窝窝移移动动通通信信服服务务保保证证服服务务订订购购服服务务质质量量 QoS幅幅度度 幅幅度度调调制制 AM幅幅度度键键控控 ASK复复用用器器高高清清电电视视 HDTV公公共共电电话话交交换换网网PSTN功功率率效效率率挂挂断断光光电电调调制制器器光光放放大大器器 光光强强光光束束光光纤纤广广域域网网WAN国国际际漫漫游游国国际际移移动动设设备备识识别别号号IMEI哈哈夫夫曼曼编编码码横横向向磁磁场场TM横横向向电电场场TE互互联联网网交交换换

25、点点IXPs话话音音拥拥塞塞 环环形形拓拓扑扑 汇汇接接局局会会话话管管理理混混合合的的 机机顶顶盒盒基基本本速速率率接接口口 BRI基基带带信信号号基基群群速速率率接接口口 基基站站控控制制器器 BSC基基站站收收发发台台 BTS基基站站子子系系统统 BSS计计费费功功能能渐渐变变光光纤纤 鉴鉴定定鉴鉴权权中中心心 AUC交交换换阶阶跃跃光光纤纤 接接入入点点接接通通解解复复用用器器解解码码器器 解解压压 介介质质控控制制访访问问子子层层近近距距离离轨轨道道 LEO竞竞争争局局域域网网 LAN绝绝缘缘体体军军用用卫卫星星开开放放互互联联系系统统模模型型OSI可可变变长长度度编编码码VLC空空

26、分分多多址址 SDMA宽宽带带综综合合业业务务数数字字网网 扩扩频频扩扩频频多多址址 SSMA蓝蓝牙牙无无线线电电系系统统离离散散变变量量离离散散系系统统 离离散散信信号号连连续续的的 连连续续相相位位调调制制CPM联联合合图图像像专专家家组组JPEG邻邻道道干干扰扰 流流控控制制传传输输协协议议STB路路径径损损耗耗路路由由码码分分多多址址 CDMA脉脉冲冲编编码码调调制制 PCM脉脉冲冲位位置置调调制制PPM美美国国电电气气电电子子工工程程师师协协会会IEEE密密集集型型波波分分复复用用DWDM模模拟拟调调制制模模数数转转换换ADC莫莫尔尔斯斯编编码码内内部部卫卫星星链链路路ISL频频分分

27、多多址址 FDMA频频分分复复用用FDM频频分分双双工工FDD频频率率 频频率率调调制制 FM频频谱谱效效率率频频谱谱效效率率频频移移键键控控 FSK强强健健稳稳定定全全球球定定位位系系统统 GPS全全球球卫卫星星系系统统全全球球移移动动通通信信系系统统GSM绕绕射射热热点点冗冗余余三三维维声声音音传传输输 散散射射上上行行时时隙隙设设备备识识别别寄寄存存器器 EIR声声光光调调制制器器时时分分多多址址 TDMA时时分分复复用用TDM时时分分双双工工TDD时时隙隙 TS识识别别实实时时控控制制协协议议实实时时图图像像实实时时协协议议视视频频点点播播VOD授授权权树树形形拓拓扑扑 数数据据链链路

28、路层层 数数据据拥拥塞塞 数数字字版版权权管管理理DRM数数字字调调制制数数字字信信号号处处理理DSP衰衰减减损损耗耗双双绞绞线线锁锁相相环环PLL天天线线跳跳频频同同步步同同步步卫卫星星 同同轴轴电电缆缆透透明明的的椭椭圆圆形形轨轨道道 HEO网网关关链链路路 网网际际层层 网网络络交交换换子子系系统统NSS网网络络接接口口层层 网网络络接接入入点点NAPs伪伪随随机机模模式式文文件件传传输输协协议议FTP无无损损压压缩缩 无无线线保保真真WiFi无无线线电电频频带带物物理理层层 系系统统网网络络体体系系结结构构SNA下下行行时时隙隙相相位位 相相位位调调制制 PM相相移移键键控控 PSK消

29、消息息序序列列协协议议无无关关组组播播信信道道绑绑定定信信道道容容量量 信信道道质质量量信信宿宿信信源源信信噪噪比比 SNR星星形形拓拓扑扑 雪雪崩崩光光电电二二极极管管APD循循环环压压缩缩 移移动动交交换换中中心心 MSC移移动动台台 MS移移动动图图像像专专家家组组MPEG移移动动用用户户连连接接 MUL已已调调信信号号异异步步传传输输模模式式ATM应应用用层层 用用户户 用用户户环环路路用用户户级级交交换换机机PBX用用户户数数据据报报协协议议 UDP用用户户线线 游游牧牧有有损损压压缩缩 预预约约越越区区切切换换 运运营营支支撑撑系系统统OSS载载波波监监听听多多路路访访问问/冲冲突

30、突检检测测CSMA/CD载载波波频频率率 窄窄带带干干扰扰窄窄带带信信号号正正交交频频分分复复用用OFDM直直接接序序列列只只读读存存储储器器ROM中中继继器器距距离离中中继继线线 中中距距离离轨轨道道 MEO终终端端适适配配器器TA专专用用线线路路 综综合合业业务务数数字字网网ISDN总总线线拓拓扑扑 最最小小频频移移键键控控MSKpositive-intrinsic negative diodethe guard bandbackground noiseLocal loopHome Location RegistercodecencoderWave division multiplexin

31、gSampling frequencyhierarchicallong wavevery short waveMetropolitan area networksProgram controlled switchsampled，compressed，quantized and encodedTransport layerTransmission control protocolband-pass filtersingle mode fibers satellites for navigationLow transmission lossgeostationary earth orbitdiel

32、ectric waveguide Circuit switchingmodulation signaljitterEnd officeshort waveMulticastmulti-path propagationMultimediaMultimode FibersMultiple accessbinary bit-streambinary FSKreflectionvisitor location registerAsymmetric digital subscriber linePacket switchingCellular mobile communication systemsSe

33、rvice assuranceService orderingquality of servicesamplitudeamplitude modulationAmplitude shift keyingMultiplexerHigh definition televisionPublic switched telephone networkpower efficiencyoff-hookelectro-optic modulatoroptical amplifierslight intensitya beam of lightOptical fiberWide area networksint

34、ernational roamingInternational mobile equipment identitiesThe Huffman codetransverse magnetictransverse electricInternet exchange pointsvoice trafficRing topologyintermediate officeSession management mixedSet-top box Basic rate interface Baseband signalPrimary rate interfacebase station controllerB

35、ase transceiver stationbase station subsystembilling functiongraded index fiberauthenticationauthentication centerexchangesStep Index FiberAccess pointon-hookdemultiplexerdecoderdecompressionMedia access control sublayerLow Earth OrbitcontentionLocal area networkInsulatormilitary satelliteOpen Syste

36、ms Interconnection ModelVariable length codingSpace division multiple accessBroadband Integrated Services Digital Networkspread spectrumSpread spectrum multiple accessBluetooth radio systemDiscrete variablesdiscrete systemDiscrete signalcontinuouscontinuous phase modulationJoint Photographic Experts

37、 Groupadjacent channel interferenceStream control transmission protocolPath lossRouteCode division multiple accesspulse-code modulationpulse position modulationAmerican Institute of electrical and Electronics EngineersDense wavelength division multiplexingAnalog modulationAnalog digital conversionTh

38、e Morse codeinter satellite linksFrequency division multiple accessFrequency division multiplexingFrequency division duplexfrequencyfrequency modulationspectral efficiencyspectral efficiencyFrequency shift keyingrobustnessGlobal Positioning Systemglobal satellite systemGlobal system for mobile commu

39、nicationspenetration of abstaclesHot spotRedundancythree dimensional sound transmissionscatteringUplink time slotequipment identity registerAcousto optic modulatorTime division multiple accessTime division multiplexingTime division duplextime slotidentifyReal time control protocolReal time imageReal

40、 time protocolvideo on demandauthorizationTree topologyData link layerdata trafficDigital rights managementdigital modulationDigital signal processingAttenuation lossa pair of wiresPhase locked loopantennasFrequency hoppingsynchronizationgeostationary satelliltea coaxial cableTransparentHighty ellip

41、tical orbitgateway linkInternetwork layerNetwork and Switching SubsystemNetwork interface layerNetwork access pointsPseudo random patternFile transfer protocolLossless compressionWireless fidelitya band of radio frequencyPhysical layerSystem network architectureDownlink time slotphasephase modulatio

42、nPhase shift keyingsequence of messagesProtocol Independent MulticastChannel bondingchannel capacitychannel qualitydestination of the informationinformation sourcesignal-to-noise ratioStar topologyAvalanche photodioderound robinCompressionmobile switching centerMobile StationMoving Pictures Experts

43、GroupMobile users linkmodulated signalsAsynchronous transfer modeApplication layersubscriberSubscriber loopPrivate Branch ExchangeUser datagram protocolsubscriber linenomadicLossy compressionreservationHandoverOperation support systemCarrier sense multiple access/collision detectionCarrier frequency

44、narrow-band interferencenarrow-band signalsOrthogonal frequency division multiplexingDirect sequenceRead-only memoryRepeater spacingTrunk lineMedium Earth OrbitTerminal adapterDedicated lineIntegrated service digital networkBus topologyMinimum shift keying二二进进制制频频移移键键控控2FSK模模数数转转换换ADC非非对对称称数数字字用用户户线

45、线 ADSL幅幅度度调调制制 AM雪雪崩崩光光电电二二极极管管APD幅幅度度键键控控 ASK异异步步传传输输模模式式ATM鉴鉴权权中中心心 AUC基基本本速速率率接接口口 BRI基基站站控控制制器器 BSC基基站站子子系系统统 BSS基基站站收收发发台台 BTS码码分分多多址址 CDMA连连续续相相位位调调制制CPM载载波波监监听听多多路路访访问问/冲冲突突检检测测CSMA/CD数数字字版版权权管管理理DRM数数字字信信号号处处理理DSP密密集集型型波波分分复复用用DWDM设设备备识识别别寄寄存存器器 EIR频频分分双双工工FDD频频分分复复用用FDM频频分分多多址址 FDMA频频率率调调制制

46、 FM频频移移键键控控 FSK文文件件传传输输协协议议FTP地地球球同同步步卫卫星星轨轨道道 GEO全全球球定定位位系系统统 GPS全全球球移移动动通通信信系系统统GSM高高清清电电视视 HDTV椭椭圆圆形形轨轨道道 HEO本本地地位位置置寄寄存存器器 HLR美美国国电电气气电电子子工工程程师师协协会会IEEE国国际际移移动动设设备备识识别别号号IMEI综综合合业业务务数数字字网网ISDN内内部部卫卫星星链链路路ISL互互联联网网交交换换点点IXPs联联合合图图像像专专家家组组JPEG局局域域网网 LAN近近距距离离轨轨道道 LEO城城域域网网MAN中中距距离离轨轨道道 MEO移移动动图图像像

47、专专家家组组MPEG移移动动台台 MS移移动动交交换换中中心心 MSC最最小小频频移移键键控控MSK移移动动用用户户连连接接 MUL网网络络接接入入点点NAPs网网络络交交换换子子系系统统NSS正正交交频频分分复复用用OFDM开开放放互互联联系系统统模模型型OSI运运营营支支撑撑系系统统OSS用用户户级级交交换换机机PBX脉脉冲冲编编码码调调制制 PCMPIN本本征征光光电电二二极极管管PIN锁锁相相环环PLL相相位位调调制制 PM脉脉冲冲位位置置调调制制PPM相相移移键键控控 PSK公公共共电电话话交交换换网网PSTN服服务务质质量量 QoS只只读读存存储储器器ROM空空分分多多址址 SDM

48、A系系统统网网络络体体系系结结构构SNA信信噪噪比比 SNR扩扩频频多多址址 SSMA流流控控制制传传输输协协议议STB终终端端适适配配器器TA传传输输控控制制协协议议 TCP时时分分双双工工TDD时时分分复复用用TDM时时分分多多址址 TDMA横横向向电电场场TE横横向向磁磁场场TM时时隙隙 TS用用户户数数据据报报协协议议 UDP可可变变长长度度编编码码VLC访访问问位位置置寄寄存存器器 VLR视视频频点点播播VOD广广域域网网WAN波波分分复复用用 WDM无无线线保保真真WiFibinary FSKAnalog digital conversionAsymmetric digital s

49、ubscriber lineamplitude modulationAvalanche photodiodeAmplitude shift keyingAsynchronous transfer modeauthentication centerBasic rate interface base station controllerbase station subsystemBase transceiver stationCode division multiple accesscontinuous phase modulationCarrier sense multiple access/c

50、ollision detectionDigital rights managementDigital signal processingDense wavelength division multiplexingequipment identity registerFrequency division duplexFrequency division multiplexingFrequency division multiple accessfrequency modulationFrequency shift keyingFile transfer protocolgeostationary

51、 earth orbitGlobal Positioning SystemGlobal system for mobile communicationsHigh definition televisionHighty elliptical orbitHome Location RegisterAmerican Institute of electrical and Electronics EngineersInternational mobile equipment identitiesIntegrated service digital networkinter satellite link

52、sInternet exchange pointsJoint Photographic Experts GroupLocal area networkLow Earth OrbitMetropolitan area networksMedium Earth OrbitMoving Pictures Experts GroupMobile Stationmobile switching centerMinimum shift keyingMobile users linkNetwork access pointsNetwork and Switching SubsystemOrthogonal

53、frequency division multiplexingOpen Systems Interconnection ModelOperation support systemPrivate Branch Exchangepulse-code modulationpositive-intrinsic negative diodePhase locked loopphase modulationpulse position modulationPhase shift keyingPublic switched telephone networkquality of servicesRead-o

54、nly memorySpace division multiple accessSystem network architecturesignal-to-noise ratioSpread spectrum multiple accessStream control transmission protocolTerminal adapterTransmission control protocolTime division duplexTime division multiplexingTime division multiple accesstransverse electrictransv

55、erse magnetictime slotUser datagram protocolVariable length codingvisitor location registervideo on demandWide area networksWave division multiplexingWireless fidelity信信噪噪比比 SNR脉脉冲冲编编码码调调制制 PCM信信道道容容量量 三三维维声声音音传传输输 抽抽样样，压压缩缩，量量化化，编编码码 离离散散系系统统 连连续续的的 混混合合的的 幅幅度度 频频率率 相相位位 幅幅度度键键控控 ASK频频移移键键控控 FSK相相移

56、移键键控控 PSK载载波波频频率率 幅幅度度调调制制 AM频频率率调调制制 FM相相位位调调制制 PM多多址址接接入入 频频分分多多址址 FDMA空空分分多多址址 SDMA时时分分多多址址 TDMA码码分分多多址址 CDMA波波分分复复用用 WDM电电路路交交换换 专专用用线线路路 用用户户 用用户户线线 中中继继线线 分分组组交交换换 局局域域网网 LAN物物理理层层 数数据据链链路路层层 总总线线拓拓扑扑 树树形形拓拓扑扑 环环形形拓拓扑扑 星星形形拓拓扑扑 应应用用层层 传传输输层层 传传输输控控制制协协议议 TCP用用户户数数据据报报协协议议 UDP网网际际层层 网网络络接接口口层层 高高清清电电视视 HDTV压压缩缩 解解压压 无无损损压压缩缩 有有损损压压缩缩 服服务务质质量量 QoS基基本本速速率率接接口口 BRI基基群群速速率率接接口口 宽宽带带综综合合业业务务数数字字网网 非非对对称称数数字字用用户户线线 ADSL光光放放大大器器 阶阶跃跃光光纤纤 渐渐变变光光纤纤 单单模模光光纤纤 多多模模光光纤纤 移移动动台台