Supported ATM Service Classes
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/055-3
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Supported ATM Service Classes
The ATM FCP manages traffic in the unspecified bit rate (UBR), available bit rate
(ABR), and variable bit rate-non-real time (VBR-NRT) service classes by applying:
Closed-loop flow control — See “Closed-loop Flow Control” on page 5-5 for more
information.
Dynamic cell rate adjustment — The ACR is adjusted by the Rate Increase Factor
(RIF) and the Rate Decrease Factor (RDF). The RDF and RIF can be configured in
proportion to the MCR. Refer to “About ACR” on page 5-14 for more information
about configuring the RDF and RIF.
MCR guarantee — The MCR guarantee varies by Quality of Service (QoS) class as
follows:
• Unspecified Bit Rate (UBR) Class – The MCR is set at a rate of 100 cps. Note that
UBR is a best effort service, and cannot be guaranteed.
• Available Bit Rate (ABR) Class – The MCR is set during circuit configuration.
• Variable Bit Rate-Non-Real Time (VBR-NRT) Class – The sustainable cell rate
(SCR) is configured during circuit admission. The SCR is used in the same way as
the MCR during ACR adjustments.
Note – The ATM FCP can manage the VBR-NRT QoS class. The management of
VBR-NRT is a configurable parameter through Navis EMS-CBGX.
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