ATM Cell Rates

From: Menga, Justin (Justin.Menga@xxxxxxxxxx)
Date: Thu Oct 25 2001 - 16:15:53 GMT-3

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Hi

Does anybody know (preferably with URL proof) how the peak cell rate and
sustained cell rate are calculated from the bandwidth parameters you enter
in IOS configuration.

E.g.

Interface atm1/0
 pvc 1/100
   vbr-nrt 1920 1024 32

Above, the PCR is 1920 Kbps, the SCR is 1024 Kbps, and the Maximum Burst
Size (MBS) is 32 cells.

To calculate the actual cell rat:

Does IOS divide the bandwidth (Kbps) by 424 bits (This is a single 53-byte
ATM cell)?

OR

Does IOS divide the bandwidth (Kbps) by 384 bits (This is 48 bytes, which is
the data payload of an ATM cell)?

I just need to match up parameters with service provider equipment that
talks cell rates, not Kbps rates. (There probably is a show command that
will show me this, but I don't have access to the customer site).

Regards
Justin Menga CCIE #6640
Network Solutions Architect
Wireless & E-Infrastructure
Compaq Computer New Zealand
DDI: +64-9-918-9381 Mobile: +64-21-349-599
mailto: justin.menga@compaq.com
web: http://www.compaq.co.nz <http://www.compaq.co.nz/>

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