From: Leigh Harrison (ccileigh@gmail.com)
Date: Tue Jan 03 2006 - 13:58:56 GMT-3
Hey there,
You have to think of it in terms of overall delay. Cisco recommends
between 150ms and 200ms for an end to end VoIP conversation to be of
good quality.
If your Tc is set to 125ms and a voice packet misses the boat for that
time period, then he's got to wait 125ms before the next boat arrives.
This takes a big chunk out of your total budget of 150ms (for example),
leaving you with only 25ms to play with.
If your Tc is set to 10ms, then our brave stranded packet will only have
to wait for 10ms for the next boat to arrive, taking much less of a bite
out of our 150ms budget. Which is a good thing.
LH
CCIEin2006 wrote:
>Can someone please explain how changing the default Tc from 125ms to 10ms
>benefits you when running voice traffic over a frame relay link?
>I understand that voice traffic is very intolerant of delay and jitter but
>how does changing your time interval help in this situation? Do the packets
>get broken up as in frame relay fragmentation?
>
>Maybe someone can explain what role the time interval plays in traffic
>shaping?
>
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