Critical Assessment of Association Admission Manage Methods in ATM NetworksJournal: International Journal of Scientific & Technology Research (Vol.1, No. 2)
Publication Date: 2012-03-25
Authors : jitendra singh chouhan; Gurvinder Singh; Krishna Pal Yadav; Sheetesh Sad;
Page : 22-27
Keywords : CAC; Qos; Services;
CAC establishes, modifies and terminates virtual ath/channel connections. More specifically, it is responsible for high-layer signaling protocols, signaling ATM Adaptation Layer (AAL) functions to interpret or generate signaling cells, interface with a signaling network, negotiation of traffic contracts with users requesting new VPCs/VCCs, renegotiation with users to change established VPCs/VCCs, allocation of switch resources for VPCs/VCCs, including route selection, admission/rejection decisions for requested VPCs/VCCs ,generation of UPC/NPC parameters .If the CAC is centralized, a single processing unit would receives signaling cells from the input modules, interpret them, and perform admission decisions and resource allocation decisions for all the connections in the switch. CAC functions may be distributed to blocks of input modules where each CAC has a smaller number of input ports. This is much harder to implement, but solves the connection control processing bottleneck problem for large switch sizes, by dividing this job to be performed by parallel CACs. A lot of information must be communicated and coordinated among the various CACs . In Hitachi\\\'s and NEC\\\'s ATM switches, input modules - each with its CAC - also contain a small ATM routing fabric. Some of the distributed CAC functions can also be distributed among output modules which can handle encapsulation of high-layer control information into outgoing signaling cells.
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