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ATM Network
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ATMATM (Asynchronous Transfer Mode)
.. ATMPacket Networks Cell Networks ATMCell ATM
ATM ATM ITU backbone software
Packet Networks Cell NetworksPacket Networks MUX
Packet Network Cell NetworkCell Networks MUX
ATM ATM cell-switched networks end points user-to-network interface (UNI) switch network-to-network interface (NNI)
ATM ATM Transmission Path (TP) TP (Virtual Path: VP) 2 (Virtual Circuit: VC)
ATM switch I switch IV switch II 2
ATM cell cell Virtual Path Identifier (VPI)Virtual Circuit Identifier (VCI)VPIVCIVPIVCI8 bits16 bits12 bits16 bitsUNI InterfaceNNI Interface
Cell ATM ATM Cell 53 (header) 5 (payload) 48
VCIHeaderPayloadVPIVCI5 Bytes48 Bytes53 Bytes
ATM ATM 3 Application Adaptation Layer (AAL)ATM LayerPhysical LayerApplication Adaptation Layer(AAL)ATM LayerPhysical
ATMApplication Adaptation Layer (AAL) ATM ATMATM Layer Physical Layer