[87454] in North American Network Operators' Group
Re: The Qos PipeDream [Was: RE: Two Tiered Internet]
daemon@ATHENA.MIT.EDU (Joe Maimon)
Sun Dec 18 17:29:55 2005
Date: Sun, 18 Dec 2005 17:29:26 -0500
From: Joe Maimon <jmaimon@ttec.com>
Cc: nanog@merit.edu
In-Reply-To: <43A5DBE3.6050800@west.net>
Errors-To: owner-nanog@merit.edu
Jay Hennigan wrote:
>
>
> VoIP by design will have high PPS per connection as opposed to data flows.
> At 20 ms sample rates you have 50 pps regardless of the CODEC or algorithm.
> Increasing the time per sample to 40 ms would cut this in half but the
> added
> latency would result in degraded quality. In addition, longer sample times
> would suffer much more degradation if there is packet loss.
My point is that sampling length should take into effect the rtt. A rtt
of 200ms tolerates far shorter sampling slices than does 20ms.
