电信全网介绍-通用部分

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1、UnderstandingTelecommunications一.PrefaceThiswebpresentationhasbeencreatedfromatwo-volumeguidetotelecommunicationsproducedjointlybyEricssonandTelia.Theprintedvolumestogetherrunapproximately1,100pages."UnderstandingTelecommunications"describesthecurrentgenerationofnetworkinf

2、rastructure.Wheretechnicaldevelopmenthasoutpacedthescopeoftheprintedmaterial,theindexwillpointtorelevantcontentinotherpartsoftheEricssonwebsite.PartApresentsageneralreviewoftelecommunicationsandcorrespondstothefirstbookintheset.PartsB-Hcorrespondtothesecondbookandexaminesp

3、ecificareasingreaterdetail.Thetelecommunicationsservicesmarketisalsoreviewedinbook2."UnderstandingTelecommunications"ispresentedwithoutcostinwebformatbythecopyrightholdersasaninformationandreferenceservice.Weanticipatethisworkwillbeusedprimarilyforresearchandreview,soathor

4、ough,linkedindexhasbeenincludedtohelpthereader.Fromageneralpointofview,"UnderstandingTelecommunications"isaboutoneofourmostimportantambitions:topromoteinterpersonalcommunicationaswellascommunicationbetweenpeopleandinformationsystems.Moreandmorepeoplerequirebasicbutcomprehe

5、nsiveknowledgeoftelecommunications-ofitssystemsandservices,andnotleastofitsspecialterminology.Ourbooksprovideanintegratedviewofwhathastraditionallybeenperceivedastwodistinctareas:telecommunicationsanddatacommunication.Weareconvincedthatthisintegratedviewisveryusefulnowthat

6、theInternetandmultimediaarebeingusedonalargerscale,increasingtheneedforcooperationbetweentelecomanddatacom.Asthetechnicaldifferencesbetweenpublicandbusinessnetworksbegintoblur,muchofthecontentinourbooksisalsoapplicabletobusinessnetworks.二.IntroductionTheglobaltelecommunica

7、tionsnetwork-thelargestandmostcomplextechnicalsystemthatmanhascreated-makesupasubstantialpartofacountry'sinfrastructureandisvitaltothedevelopmentofthatcountry.Developmentinthefieldoftelecommunicationshasbeenveryrapidinrecentyears.Bytelecommunicationswemeanhereallprocessest

8、hatrenderitpossibletotransfervoice,dataandvideowiththehelpofsomeformofelectromagneticsyst