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Understanding ATM Concepts
114056 Rev. A 2-19
You can change your ATM traffic parameters several times before deciding on a
particular set. This section explains the different traffic parameters and provides
some basic guidelines for customizing traffic parameters on an ATM PVC or ATM
Control VC (that is, the signaling VC or interim local management interface VC).
Variable Bit Rate Versus Available Bit Rate
Bay Networks currently provides the following ATM ILI pairs:
An ATM FRE2 link module in conjunction with a FRE2 processor
An ARE link module in conjunction with an ARE processor
Either ILI pair allows the router to connect directly to an ATM network over an
ATM physical interface. However, depending on the ATM ILI pair, the method of
determining bandwidth varies.
Variable Bit Rate
ATM FRE2 ILI pairs use variable bit rate (VBR) to determine bandwidth
allocation. VBR allows the VC to accumulate credits whenever it does not use any
bandwidth within its specified average. When this VC does use bandwidth, the
accumulated credits allow it to transmit using the Peak Cell Rate (PCR).
Available Bit Rate
ATM ARE ILI pairs use available bit rate (ABR) to determine bandwidth
allocation. ABR is a method by which the bandwidth is separated into a
guaranteed portion (for PVCs and control VCs) and an available portion (for data
SVCs).
Note: You do not need to manually configure traffic parameters for SVCs (as
you must for PVCs and Control VCs), because SVCs dynamically negotiate
these parameters before transferring data.
Note: Bay Networks does not currently incorporate ABR congestion control
features as defined by the ATM Forum.
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