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Message Digest
Volume 28 : Issue 337 : "text" Format
Messages in this Issue:
Re: Verizon femtocell user report
Merry Christmas
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Date: Thu, 24 Dec 2009 22:55:38 GMT
From: Stephen <stephen_hope@xyzworld.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: Verizon femtocell user report
Message-ID: <t2s7j5taq2jrnpujuetimv0r619isbvqql@4ax.com>
On Wed, 23 Dec 2009 15:20:42 -0500, "Geoffrey Welsh"
<gwelsh@spamcop.net> wrote:
>AES wrote:
>> Comcast gives us typically a 10 to 20 MB Internet connection.
>> Users guide for the femtocell claims it should work OK with a 300
>> to 400 KB DSL connection.
>
> A voice connection doesn't require much bandwidth, so it should work
> with just about any wired or fixed wireless broadband service, but
> voice connections are very sensitive to latency, and whether you
> have 256 kilobits per second or 10 megabits per second, one poorly
> configured BitTorrent client might render your calls intolerable...
Voice traffic is normally symmetric (OK, with cellular maybe you get
some silence suppression part of the time).
So, what matters is the slwest traffic stream - upstream on a typical
ADSL or cable broadband link.
>
>***** Moderator's Note *****
>
> Why?
The voice is sensitive to jitter and packet loss.
Conventional G.711 / G.729 voice used with IP telephony jitter usually
has a hard limit much lower than for typicl data traffic (well below
100 mSec).
ITU recommendation is packet loss below 1%.
Any sugnificant contention on a home link with no priority for voice
is going to trash those numbers.....
>
>Bill Horne
--
Regards
stephen_hope@xyzworld.com - replace xyz with ntl
Date: Fri, 25 Dec 2009 00:21:09 -0500
From: Telecom digest moderator <redacted@invalid.telecom.csail.mit.edu>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Merry Christmas
Message-ID: <20091225052109.GA4583@telecom.csail.mit.edu>
If you celebrate the holiday, I wish you a Merry Christmas. Whether or
not you do, I also wish you the gifts of love and courage.
Bill
--
Bill Horne
Moderator
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End of The Telecom digest (2 messages)
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