[cisco-voip] QoS Question over WAN

[Linsemier, Matthew]

I don't have much experience with ATM but I can tell you that from a
Frame-Relay standpoint, you may want to find out if your total bandwidth
includes telco framing or not.  

We ran into an issue on a Frame-Relay T1 where we were supposed to have
1536 burst with 1024 CIR.  When we set the "frame-relay cir" to 1536000,
and our "frame-relay mincir" to 1024000, we ran into issues where once
there was a lot of traffic on the pipe, congesting the link, the voice
would start cutting in and out causing jitter.  Once we bumped the
frame-relay cir down to 1472000 (subtracting 64000), the voice problems
went away.

You may want to give this a shot and see if it helps.

Matt

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jeffrey C.
Ollie
Sent: Thursday, November 02, 2006 4:42 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] QoS Question over WAN

Is this using FRF.8 to translate the ATM PVC to a FR PVC?  I used to
have a similar setup between the main campus here and one of our larger
satellite campuses but we got rid of it a few weeks ago because we got
tired of all of the complaints about slowness or garbled VoIP traffic.
>From talking with my provider I got the impression that the device that
they used to handle the FRF.8 translation wasn't very good at QoS.  We
switched to PtP T1s that terminate on a channelized DS3 at our end.
It's been great (other than being more expensive)...  It'll be even
better once the 28E agreement gets approved so that we can use some dark
fiber that the city owns.  We still have three other sites using FRF.8
but they are much smaller and don't put a lot of bandwidth on the wire.

On Thu, 2006-11-02 at 13:15 -0800, Voll, Scott wrote:
> I'm not as good as I would like to be when it comes to QoS so here is
> the problem.
> 
>  
> 
> ATM DS3 PVC to Frame Relay t1...... CIR supposedly 1mb.
> 
>  
> 
> I have never been able to push over 800k over the link.  I have all my
> QoS configured for 1mb.  If the client uses 800k the voice / Signally
> goes all weird.  Is this my problem.  I need to redo all my QoS with a
> CIR of 800k and that would fix it?  Or get the telco to fix it so I
> really get 1mb CIR and that fix it?
> 
>  
> 
> I'm sure(99%) I have the QoS configured correctly as TAC gave it there
> blessing.
> 
>  
> 
> Thoughts?
> 
>  
> 
> Scott
> 
> 
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