From: Tarun Pahuja (pahujat@gmail.com)
Date: Thu Nov 08 2007 - 17:14:20 ART
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
>
> --------------------------------------------------------------------------
> NOTICE OF CONFIDENTIALITY: This e-mail message may contain confidential
> information and is intended only for the person(s) named above. Any review,
> use, disclosure or distribution by any other person is prohibited. If you
> are not the intended recipient, please contact the sender by e-mail and
> destroy all copies of this message.
> -----Original Message-----
>
>
> 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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:29 ART