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1、SSyyedRiifffatAAlliDDiiggiittaallSSwwiittcchhiinnggSSyysstteemmss((SSyysstteemmRReelliiaabbiilliittyyaanddAAnnalysis)BellCommunicationsResearch,Inc.Piscataway,NewJerseyMcGraw-Hill,Inc.NewYork?SanFrancisco?Washington,DC.Auckland?BogotA?Cara-cas?Lisbon?LondonMadrid?M
2、exicoCity?Milan?Montreal?NewDelhiSanJuan?Singapore?Sydney?Tokyo?Toronto2PREFACEThemotiveofthisbookistoexposepracticingtelephoneengineersandothergraduateengineerstotheartofdigitalswitchingsystem(DSS)analysis.Theconceptofapplyingsystemanalysistechniquestothedigitalsw
3、itchingsys-temsasdiscussedinthisbookevolvedduringthedivestitureperiodoftheBellOperatingCompanies(BOCs)fromAT&T.BellCommunicationsResearch,Inc.(Bellcore),formedin1984asaresearchandengineeringcompanysupport-ingtheBOCs,nowknownasthesevenRegionalBellOperatingCompanies(
4、RBOCs),conductedanalysisofdigitalswitchingsystemproductstoascertaincompatibilitywiththenetwork.SincethenBellcorehasevolvedintoaglobalproviderofcommunicationssoftware,engineering,andconsultingservices.Theauthorhasprimarilydependedonhisfieldexperienceinwritingthisboo
5、kandhasextensivelyusedengineeringandvarioussymposiumpublicationsandadvicefrommanysubjectmatterexpertsatBellcore.Thisbookisdividedintosixbasiccategories.Chapters1,2,3,and4coverdigitalswitchingsystemhardware,andChaps.5and6coversoftwarear-chitecturesandtheirimpactonsw
6、itchingsystemreliability.Chapter7primarilycoversfieldaspectsofdigitalswitchingsystems,i.e.,systemtestingandaccep-tanceandsystemmaintenanceandsupport.Chapter8coversnetworkedaspectsofthedigitalswitchingsystem,includingSTfSCP,andAIN.Chapter9devel-opsahypotheticaldigit
7、alswitchingsystemandexploressystemanalysisneeds.Theobjectofchapter10istointroducethehardwareandsoftwareofvariousmajordigitalswitchingsystemsinusetodayintheNorthAmericannetwork.SummaryThisbookdevelopshardwareandsoftwarearchitecturesrelatedtomoderndigitalswitchingsys
8、tems.Ituseswithaninside-outapproach,i.e.,startingfrombasicbuildingblocksandthengraduallyaddingmoreadvancedfunctionalities.Itthenappliesadvancedte
