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1、阐述数字网络外文翻译阐述数字X络外文翻译导读:ntlyassignedtoyouerequirementforintegratingavarietyofservicesthattheunicationsplementedasasetofdigitalsultipleplementedtheuser’spointofvielyaccessibleent(e.g.,ephonesputerterminals,personalputers).Thiscanleadtoextraordinaryflexibility.Forexample,ephonenumberscouldbeassignedint
2、hesamefashionasU.S.socialsecuritynumbers,goodforalifetime.Nomatteroved,dialingthenumberpermanentlyassignedtoyouerequirementforintegratingavarietyofservicesthatthelargelyaddressedtheinterexchangetransmissionsystemofthemetropolitanedivisionmultiplexingtechnique,ratherthanthetraditionalfrequencydivisio
3、nmultiplexingtechnique,resultedinanenhancedcapacityoftheexistingephoneplantatminimalcost.Furtherdevelopmentintransmissionsystems,especiallythosebasedonfiberoptictransmissiontechniques,havepushedthedigitizationprogramostoptimisticprojectionsmadejustafesofinformationtransport,lightshaveprovedthemselve
4、seconomicallyandaninitialtransmissioncapabilityof45Mbpstenyearsago,thecapacityoflightshasdoubledevery18months.Presently,1.8Gbpssystemsareavailable,andbymid-1990,2.2Gbpssystemsercialmarket.End-to-enddigitizationisavailableinlimitedpocketsintheUnitedStatestodaybutisexpectedtogrouchbeyondhavingdigitals
5、issionhardainfocusofISDNisonthesupportofaeitedsetofuserents.Heretofore,privatelineandsadebyemunicationsadministrationsusingfunctionallyseparateple,areoftenisolatedfromoneanother,andinterisusuallyadifficultte阐述数字X络外文翻译(2)导读:digitizationoftheemunicationsunicachnicalissue.ISDNproviderfortheseserviceson
6、framethepointofvie,througheasyinterongdifferentservices,ofthecontinuingusageoftheirapplicationseetstheenduser’sneeds,butresultinginnoadditionalinterfaceproblems,thesegoalsofISDNunicationsunications,onaglobalbasis.ThefirstsetofstandardsforISDNogeneousinfrastructure.Analogmunicationechanismisabasicteo
7、fISDN.TheISDNframeonaccessarrangementsitedofaccessinterfaces.Itiseasytorecognizethatthereareverylargefixedcostsintheglobalemunicationsuni8cationsmarketplace,itiseasytoseethatitmaybeinfeasibletomoveimm