Lucent Technologies CBX 3500 Configuration Manual page 787

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Adjusting the CAC
This appendix describes how to tune the Lucent Call Master Connection Admission
Control (CAC) to achieve a desired cell loss ratio (CLR) objective across all physical
ports in your network. The Lucent CAC is responsible for the bandwidth allocation on
all ATM cards on the CBX 3500, CBX 500, GX 550, and B-STDX 9000. It is also
responsible for bandwidth allocation on all frame cards with the priority frame
capability.
When you create a circuit, the CAC function computes a bandwidth allocation for that
circuit and updates the bandwidth allocation for the circuit's QoS class. This
bandwidth allocation depends on the specified CAC implementation, the circuit's QoS
class, and the circuit's specified traffic descriptor (TD). If you try to create a circuit
that causes the allocated bandwidth for a given QoS class to exceed the bandwidth
available for that class, the circuit will not be created.
The CAC configuration option enables you to choose one of the following three CAC
implementations:
Lucent CAC — Allows you to control the Quality of Service (QoS) and bandwidth
allocation by specifying CLR and cell delay variation (CDV) objectives.
Customize VBR-NRT and ABR — Allows you to control the amount of bandwidth
that is reserved for VBR-NRT and available bit rate (ABR) circuits.
Customize VBR-RT, VBR-NRT, and ABR— Allows you to control the amount of
bandwidth that is reserved for VBR-RT, VBR-NRT, and ABR circuits.
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 A-1