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1.10 REFERENCES 41ISDNITUITU-TLATALCLELECLNMPMSCNANPNNNPAOCPPBXPCMPSTNRRFRLCSSCNSDHSLSNSONETSPCSTMSTSTTASITCTC2TC4TDMTGVPNIntegrated Services Digital NetworkInternational Telecommunication UnionTelecommunication Standardization Sector of ITULocal access and transport areaLine circuitLine equipment, local exchangeLocal exchange carrierLine numberMultiplex portMobile switching centerNorth American numbering planNational numberNumbering plan areaOptical carrierSingle portPrivate branch exchangePulse code modulationPublic switched telecommunications networkreceive circuit of four-wire circuitRadiofrequencyRemote line concentratorSubscriber, send circuit of four-wire circuitSwitched-circuit networkSynchronous Digital HierarchySubscriber lineSubscriber numberSynchronous Optical NetworkStored-program controlledSynchronous transport moduleSynchronous transport signalTrunkTime assignment speech interpolationAnalog trunk circuitAnalog two-wire trunk circuitAnalog four-wire trunk circuitTime-division multiplexingTrunk groupVirtual private network1.10 REFERENCES1. Engineering and Operations in the Bell System, 2nd ed., AT&T Bell Laboratories, 1984.2. The International Public Telecommunication Numbering Plan, Rec. E.l64, ITU-T,Geneva, 1997.