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Performance of the ABR policer in an ATM network   Nagaraja Srikantashastry

Performance of the ABR policer in an ATM network

224 страниц. 2011 год.
LAP Lambert Academic Publishing
Asynchronous Transfer Mode (ATM) networks provideAvailable Bit Rate (ABR) and Unspecified Bit Rate(UBR) services for data traffic. The networkguarantees low cell-loss ratio (CLR) in the ABRservice for which it needs to impose a strict trafficpolicing measures to punish the non-compliant users. The accuracy of a policer is critical for thenetwork to meet the guaranteed QoS. The errors inthe policing algorithm lead to poor performance, witha potential QoS short fall. The ABR policer comprisestwo algorithms, one for conformance checking withreference to a police rate, the other for generatingthe police rate. The ATM Forum has specified aDynamic Generic Cell Rate Algorithm (DGCRA) for cellconformance checking with reference to a police ratewhich is generated by Algorithm A or 2_StoreAlgorithm B. Algorithm A is accurate but morecomplex to implement. The 2_Store algorithm is simplebut less accurate. The N_Store, an extension of the2_Store algorithm has been proposed to the ATM Forum[3]...
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