| ATM作为B—ISDN网络的关键技术在全世界范围内得到了广泛研究和迅速发展,它将在未来的公用和专用宽带网中发挥重要的作用。本书全面、系统地介绍了ATM和B—ISDN网络的基础知识,其内容包括B—ISDN网络模型,ATM的基本概念,ATM适配层(AAL)协议规范,ATM交换原理,ATM网络的业务量管理和拥塞控制,向时按照ITU-T Q·2931规范介绍了ATM网络的呼叫和连接控制,以及OAM信令等。此外,还讨论了SONET网络的分层结构和设备映射复用操作。 |
| 目 录 Prefacexxi CBAPTERIIntroduction1 Introductionl ThePresentTelecommunicationsInfraatructurel PresentTechnologiesforVoice,Video,andDataNetworks2 PresentandFutureRequirements5 DownsizingandOutsourcing6 PresentSystems6 CostsofLeasedLines8 VirtualCompaniesandVirtualNetworks9 FastRelayNetworksandATM12 DevelopmentofATM14 ApplicationsuseofATM14 FastRelayNetworksandSONET16 BroadbandISDN19 Summary2l CHAPTER2TheNatureotAnalogandDigitalSystems22 Introduction22 AnalogSystems22 Cycles,Frequency,andPeriod23 Bandwidth24 BroadbandandBasebandSignlals26 OtherDefinitionsofBroadband27 Channel(Link)Capacity27 NoiselessChannelsandHarryNyquest28 NoisyChannels29 TheSignal-to-NoiseRatio30 TheAnalog-to-DigitalConversionProcess30 Sampling,Quantizing,andEncoding3l OtherCodingSchemes34 TimingandSynchronizationinDigitalNetworks35 PlesiochronousNetworks35 TheSynchronousClockHierarchy36 ClarificationofTerms37 TimingVariations37 Slips-ControlledandUncontrolled38 BitorClockSl |
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