From: Mark Mahan (mmahan@caprock.com)
Date: Thu Nov 08 2007 - 18:13:36 ART
I see. Thanks for the information. I haven't yet run across ATM. That
bottom formula certainly looks familiar...
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
________________________________
From: Tarun Pahuja [mailto:pahujat@gmail.com]
Sent: Thursday, November 08, 2007 2:14 PM
To: Mark Mahan
Cc: iosluver@gmail.com; ccielab@groupstudy.com
Subject: Re: Framgmentation & Interleaving
Mark,
LFI is also done for low speed ATM Links. LFI is done before
the cell formation. The ideal fragment size should allow the fragments
to fit into an exact multiple of ATM cells. The fragment size for MLP
over ATM can be calculated using the following formula:
fragment size = 48 * number of cells - 10
Fragment size at the MLP bundle can be configured using the following
formula:
fragment size = bandwidth * fragment-delay/8
HTH,
Tarun
On Nov 8, 2007 10:44 AM, Mark Mahan <mmahan@caprock.com> wrote:
Like you said, it's a necessity for voice over IP over Frame-Relay on
smaller links. We use it all the time pushing voice and data over
bandwidth limited satellite links (combine choppy voice with the
inherent delay of satellite to get a really unhappy customer). For PPP
links at or under 768k you can turn on PP multilink and do fragmentation
and interleaving as well for the same benefits.
You can't and wouldn't need to fragment on Ethernet and I'm not familiar
with ATM but since it is a set 53 byte cell, it wouldn't be necessary
(at least the fragment part. I don't know enough about ATM to know if it
interleaves voice cells and data cells on the same PVC.)
As far as other practice applications; anything jitter sensitive
requires LFI though voice and maybe real time interactive video are all
I've ever seen that require it so far.
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 <http://www.caprock.com/>
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From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of iosluver@gmail.com Sent: Thursday, November 08, 2007 8:18 AM To: ccielab@groupstudy.com Subject: Framgmentation & Interleaving
Hi,
Can someone please enlighten me on other practical applications of Fragmentation & interleaving?
I have no production experience & my knowledge as far as this is concerned is purely in a lab. I know it's a used strategy to interleave voice packets which are typically small in between larger packets to alleviate the effects of serialization delay caused by large packets traversing a shared frame-relay circuit. My question is it practical, required or even necessary to do this on ATM, Ethernet or PPP circuits?
Thanks
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