WAN

,

SONET/SDHX.25F-RELAYISDNATM

SONET/SDHSONET/SDHSynchronous Optical Network/ Synchronous Digital HierarchySONETANSISDHITU-TSONET/SDH

SONET/SDH(Mbps)SONETSDH51.840OC-1155.520OC-3STM-1466.560OC-9STM-3622.080OC-12STM-4933.120OC-18STM-61244.160OC-24STM-81866.240OC-36STM-122488.320OC-48STM-16

4976.6400C-96STM-329953.280OC-192STM-64

SONET/SDHSONET OSI

SONET/SDH

SONET/SDHOSISectionLinePath)

SONET/SDHSMT-1STM-1155.520M2430892703OC-1125us8000/s

X.25X.25ITU-T1976X.25:8090

X.25X.25DTEDCEDTEDCE

X.25

X.25HDLC

X.25

PTNPT3XX3X28X29PSENMCPCPADFEPX.25

F-RELAY1984CCITTITU-T Q.92264kbps

FRX.25X25

FRX.25

FR-

ISDNISDNITU-T 1976

ISDN

ISDN

ISDN

BRI-BRI264kbpsB116kbpsDISDNBRI PRI

ISDNBRI

ISDNPRIPRI-PRI2364kbps164kbps

ISDN

ATMQoS100us

ATM-TDMTDM

ATM-ATDMTDM

ATM-architectureATMUser-network interfacenetwork-network interface

ATM-TP VP VCTPTransmission PathVPVirtual PathVCVirtual Circuit

ATM-virtual connectionVirtual ConnectionVPI,VCIVPIVirtual Path Identifier VCIVirtual Circuit Identifier ,may be repeated under different VP

ATM-UN CELL NN CELLcell

ATM-Cell HeadCell Head

ATM-Connection SetupCall Setup

ATM-Cell Switch

ATM-Cell Switch

ATM-Virtual Circuitcellhead

ATM ArchitectureATM

ATMATM Layer

ATMATMQoSSCRPCRMCRCLRCTDCDV

ATMATMWAN