From: dampened (cheechew@hotmail.com)
Date: Tue Jan 16 2007 - 07:40:40 ART
Some confusion here. I am not sure what is the relation between
fragmentation and Bc value.
If the packet is larger than Bc, will this packet be fragmented to fit into
Bc?
If not, how the Tc can affect the voice latency?
Please comment.
"Edison Ortiz" <edisonmortiz@gmail.com>
Sent by: nobody@groupstudy.com
01/15/2007 12:14 AM
Please respond to
"Edison Ortiz" <edisonmortiz@gmail.com>
To
"prashant shukla" <shukla_cisco@yahoo.co.in>, <ccielab@groupstudy.com>
cc
Subject
Re: IEWB--- Be calculations.
#1
128k or 384k now becomes your AR and the Tc is given for the circuit on that
case.
Be = (128-64)x32/1000
Be = (384-64)x64/1000
Forget about the 512k AR, it's there to confuse you.
#2
Other signs to look for, if you have voice on the circuit. Voice latency
needs the minimum
Tc value which is 10ms. Then you need to fragmented, example:
Bc = (CIR*Tc)/1000
Bc = (512000*10)/1000 which is Bc 5120 (640 bytes) - passes fragmentation
rule
Whereas if you have
Bc = (512000*32)/1000 which is Bc 16384 (2048 bytes) - fails fragmentation
rule and this
packet must be fragmented.
----- Original Message -----
From: "prashant shukla" <shukla_cisco@yahoo.co.in>
To: <ccielab@groupstudy.com>
Sent: Sunday, January 14, 2007 2:31 AM
Subject: IEWB--- Be calculations.
> Gurus,
>
> This is what i understand and need clarification on.
> AR= 512Kbps ; CIR = 64Kbps.
>
> Bc= CIR x Tc / 1000
> Be= (AR-CIR) x Tc / 1000
>
> #1. So im able to the above calculation if the question mentions " allow
> DLCi 103 to burst upto port speed " then the Be formula works with
> (512-64)kbps x TC/1000, my doubt comes when the question says, " Allow the
> DLCI to burst upto 128 /384 Kbps for 32ms or 64ms etc etc." here how to
> look for the Be, as the burst is not upto port speed, so im struggling to
> find a "Universal rule".
>
> #2.Secondly; in questions where its not mentioned any Tc value I would
> like to
> go for 125ms as default, what other "Signs" i should look for where the
> Tc value can be influenced, e.g. In one IEWB it mentions " The packet
> above 960 bytes should be fragmented". Is this a catch!! as the the Tc
> chosen made .
>
> hope i was clear enough... :-)
>
> Shukla.
>
>
>
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