ProtocolStructure -
B ISDN: Broadband Integrated Services Digital Network (BroadbandISDN)
ATMadaptation layer (AAL). This layer is responsible for mapping the serviceoffered by ATM to the service expected by the higher layers. It has twosublayers.
ATMLayer. This layer is independent of the physical medium over which transmissionis to take place. It has those functions: Generic flow control (GFC) function,Cell header generation and extraction, Cell multiplex and demultiplex.
Physicallayer. This consists of two sublayers: Transport Convergence (TC) and Physicalmedium (PM)
Themanagement plane consists of two functions to perform layer management andplane management.
The plane management is not layered as the other layers are.This is because it relies needs information on all aspects of the system toprovide management facilities for the systems as a whole.
The layer managementprovides information and control facilities for the protocol entities thatexists in each individual layer. This includes operation and maintenance (OAM)functions for each layer.
Thecontrol plane is responsible for the supervision of connections, including callset-up, call release and maintenance.
The userplane provides for the transfer of user information. It also includesmechanisms to perform error recovery, flow control etc.
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