From: syv (syv@911networks.com)
Date: Fri Nov 22 2002 - 01:34:00 GMT-3
On Thursday, November 21, 2002, eric wrote:
-----Original Message-----
e> Does anybody have some baseline numbers to use with voip across a
e> frame-relay connection. I am a bit confused with the different books since
e> they all give the examples but no real explanation as to why or how they
e> come up with these numbers. Solie book comes up with completly diff.
e> numbers.
e> ie..cisco voice over frame-relay page 261
e> frame cir 12800
e> frame bc 1280 why 1%
e> frame be 0 ?
e> no frame mincir ?
CIR: Committed Information: Average rate of data transmitted
over a specific connection for a fixed period of time.
BC: Commited burst: Maximum amount of data the network
agrees to transfer, under normal conditions, over a fixed
and specific time interval.
bc= cir/8 for data, or cir/100 for voice
Be: Excess Burst: Maximum amount of data in excess of Bc
that the network will attempt to transfer, under normal
conditions, over a fixed time interval. Bits per second.
Usually: cir - mincir
Tc: Time Interval Pre-determined unit of time measured in
seconds per burst.
Tc = Bc/CIR. 10 ms is ideal for voice, can NOT exceed 125
ms.
MINCIR By default equals CIR/2 or Mincir= cir
-- Thanks syv@911networks.com
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