From: Elias Chari (elias.chari@gmail.com)
Date: Thu Jul 20 2006 - 20:14:31 ART
Hi Victor,
As far as I know DS0 is 64kb/s in TDM terms. Now any codec I am familiar
with does not produce VoIP at exactly 45kb/s per call, neither with or
without the FR overhead added to the total bandwidth requirements.
Closets one is G726, so I assume the codec type used is G726 with a bit of
extra bandwidth allocated for safety. See codec types in the link below.
http://www.cisco.com/en/US/customer/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml
The bandwidth is definitely configured based on the number of maximum
simultaneous calls supported,
http://www.cisco.com/en/US/customer/tech/tk543/tk545/technologies_tech_note09186a0080104819.shtml
HTH
Elias
On 7/20/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> Hi Elias,
>
> That's fine, but check out here link http://home.satx.rr.com/n5gpi/qos.htm
> ,
> I'm wondering where this values came up, and if that information is
> accurate.
>
> Saludos,
> Victor.-
>
> VoBW = 45k per each DS0 ?? Why 45k??
>
>
> *256K Circuits*
> CIR = 256000
> BC = 2560
> Tc = .01 Secs (10ms)
> Frag = 320 bytes
> VoBW = 180 *using the formula above, 256/DS0 == 4 and 4 * 45 == 180*
>
> *512K Circuits*
> CIR = 512000
> BC = 5120
> Tc = .01 Secs (10ms)
> Frag = 640 bytes
> VoBW = 360 (360K of the 512K available) *using the formula above, 512/64
> ==
> 8 and 8 * 45 == 360*
>
>
> ________________________________________
> De: Elias Chari [mailto:elias.chari@gmail.com]
> Enviado el: Jueves, 20 de Julio de 2006 04:52 p.m .
> Para: Victor Cappuccio
> CC: ccielab@groupstudy.com
> Asunto: Re: Frame-relay RTP BW.
>
> Hi Victor,
>
> I would have thought this is dependent on the codec used for VoIP and it
> is
> the sum of all simultaneous VoIP calls supported. It only selects payload
> from the even numbered UDP ports. So RTP traffic is placed in the PQ and
> RTCP in the default WFQ. So you don't need to worry about additional
> control
> traffic when calculating the bandwidth for the command.
>
> I'm not sure though whether the bandwidth allocated takes into account L-2
> overheads or not. Perhaps someone else can clarify this point.
>
> Rgds
> Elias
>
>
> On 7/20/06, Victor Cappuccio < cvictor@protokolgroup.com> wrote:
> Hi guys,
>
> How to calculate the RTP Bandwidth necessary for a frame-relay fragment?
>
>
> For example
>
> map-class frame-relay voip
> frame-relay cir 256000
> frame-relay bc 2560
> frame-relay be 600
> frame-relay mincir 256000
> no frame-relay adaptive-shaping
> frame-relay fair-queue
> frame-relay fragment 250
> frame-relay ip rtp priority 16384 16380 210
>
> How the 210Kbps was calculated here?
>
>
> Thanks
> Victor.-
>
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