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Configuring VBR-nrt on IMA card

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I am trying to configure VBR-nrt for a Verizon 1.5 meg ATM circuit. The
verizon engineer sent me the information on the circuit. I am not very
familiar with ATM. There will be 2 PVC's, each with 768K provisioned. He
gave me these settings:

PCR 3266
SCR 1181
MBS 100

These are obviously in cells per second. IOS states that PCR is in kbps. IOS
also states that the maximum PCR for a T1 would be 1544 or (1538 or
whatever). However, when I am in the PVC sub interface config, the maximum
value IOS lets me enter for PCR is 1000. I cannot figure out why I cannot
enter the value equal to the full bandwidth of the circuit.

This is a 26xx router, running 12.0(7)T


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