From: Wink (dwinkworth@wi.rr.com)
Date: Tue Oct 16 2007 - 22:32:24 ART
The thought behind this is that while voice traffic is present, you will not
exceed the rate that telco guarantees you. (Which telco calls your CIR, and
Cisco calls your mincir).
You don't want to exceed your guaranteed rate when voice traffic is present,
because it may cause telco to queue your packets in intermediate carrier
node buffers (atm switches, frame switches, MPLS nodes providing AToM
services, etc), thus impacting voice negatively.
----- Original Message -----
From: "Mark Mahan" <mmahan@caprock.com>
To: "Navid Daghighi" <daghighi.navid@free.fr>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Tuesday, October 16, 2007 1:55 PM
Subject: RE: frame relay voice adap
>I believe it eliminates the possibility of jitter caused by variable
> transmission rates as PVC traffic shaping rates are throttled down from
> the CIR when you get a BECN and ramp back up after a period no
> congestion. With traffic locked at the minCIR rate when voice traffic
> is present, you have a steady rate and since RTP should be in a PQ,
> little jitter.
>
>
>
> Mark Mahan
> Network Engineer
> -------------------------------
> CapRock Communications
> 4400 S. Sam Houston Parkway E.
> Houston, Texas 77048
> Office: 832 668 2528
> mmahan@caprock.com
> www.caprock.com
>
>
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> -----Original Message-----
>
>
>
>
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Navid Daghighi
> Sent: Monday, October 15, 2007 5:17 PM
> To: Cisco certification
> Subject: frame relay voice adap
>
> Hi,
>
> Cisco doc says :
>
> "Frame Relay voice-adaptive traffic shaping enables a router to reduce
> the permanent virtual circuit
> (PVC) sending rate to the minimum CIR (minCIR) whenever packets (usually
>
> voice) are detected in the
> low latency queueing priority queue or H.323 call setup signaling
> packets are present."
>
> Why would it be useful to reduce the sending rate, when there are
> packets in a priority queue ?
>
>
> Thanks,
> Navid
>
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This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:15 ART