[avt] Use of redundancy in rfc2793bis text transmission - optimizing interoperability
Gunnar Hellström <gunnar.hellstrom@omnitor.se> Wed, 14 April 2004 21:40 UTC
Received: from optimus.ietf.org (optimus.ietf.org [132.151.1.19]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id RAA29191 for <avt-archive@odin.ietf.org>; Wed, 14 Apr 2004 17:40:30 -0400 (EDT)
Received: from localhost.localdomain ([127.0.0.1] helo=www1.ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1BDs3N-0002PH-Sy for avt-archive@odin.ietf.org; Wed, 14 Apr 2004 17:36:18 -0400
Received: (from exim@localhost) by www1.ietf.org (8.12.8/8.12.8/Submit) id i3ELaHbG009243 for avt-archive@odin.ietf.org; Wed, 14 Apr 2004 17:36:17 -0400
Received: from localhost.localdomain ([127.0.0.1] helo=www1.ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1BDrli-0005be-UH; Wed, 14 Apr 2004 17:18:02 -0400
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by optimus.ietf.org with esmtp (Exim 4.20) id 1BDrUs-0005aJ-Jk for avt@optimus.ietf.org; Wed, 14 Apr 2004 17:00:38 -0400
Received: from ietf-mx (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id RAA25712 for <avt@ietf.org>; Wed, 14 Apr 2004 17:00:35 -0400 (EDT)
Received: from ietf-mx ([132.151.6.1]) by ietf-mx with esmtp (Exim 4.12) id 1BDrUq-0003Br-00 for avt@ietf.org; Wed, 14 Apr 2004 17:00:36 -0400
Received: from exim by ietf-mx with spam-scanned (Exim 4.12) id 1BDrTw-00038N-00 for avt@ietf.org; Wed, 14 Apr 2004 16:59:41 -0400
Received: from webmail.pi.se ([195.7.65.57]) by ietf-mx with esmtp (Exim 4.12) id 1BDrTO-000363-00 for avt@ietf.org; Wed, 14 Apr 2004 16:59:06 -0400
Received: from webmail.pi.se (localhost [127.0.0.1]) by webmail.pi.se (8.12.8/8.11.1) with ESMTP id i3EKx4Da072781; Wed, 14 Apr 2004 22:59:05 +0200 (CEST) (envelope-from gunnar.hellstrom@omnitor.se)
Received: (from www-data@localhost) by webmail.pi.se (8.12.8/8.12.8/Submit) id i3EKx4IZ072780; Wed, 14 Apr 2004 22:59:04 +0200 (CEST) (envelope-from gunnar.hellstrom@omnitor.se)
X-Authentication-Warning: webmail.pi.se: www-data set sender to gunnar.hellstrom@omnitor.se using -f
Received: from 81.254.35.57 ([81.254.35.57]) by webmail.pi.se (Horde) with HTTP for <au1042@webmail.pi.se>; Wed, 14 Apr 2004 22:59:04 +0200
Message-ID: <1081976344.43da888b9d93c@webmail.pi.se>
Date: Wed, 14 Apr 2004 22:59:04 +0200
From: Gunnar Hellström <gunnar.hellstrom@omnitor.se>
To: avt@ietf.org
Cc: toip@snowshore.com
Subject: [avt] Use of redundancy in rfc2793bis text transmission - optimizing interoperability
MIME-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
User-Agent: Internet Messaging Program (IMP) 4.0-cvs
X-Originating-IP: 81.254.35.57
X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on ietf-mx.ietf.org
X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60
Content-Transfer-Encoding: quoted-printable
Sender: avt-admin@ietf.org
Errors-To: avt-admin@ietf.org
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.0.12
Precedence: bulk
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Id: Audio/Video Transport Working Group <avt.ietf.org>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
Content-Transfer-Encoding: quoted-printable
I often get comments on the real time interactive text conversation transport RFC2793bis, that it must more clearly require the use of redundancy to assure good success rate in text transmission even in bad network conditions. Next version of draft-ietf-avt-rfc2793bis is about to be published, and I would like to have agreeable wording on this issue. A traditional requirement for basic text conversation quality is that no more than 1% characters may be lost in conditions where voice communications is barely usable. Where characters are dropped marks for missing text should be inserted in the received text. A higher quality level, called good text quality requires no more than 0.2% characters to be dropped. This is of course no exact scientific measure and many factors influence both the loss and the perception of usability of voice conversation, but it gives a fair design goal. With voice coding and transmission schemes prevailing today, voice gets barely usable around 20% packet loss. Therefore, in order to assure proper interoperability with the required quality level for text at 20% packet loss, we need to require one original and two redundant transmissions according to RFC2198. ( lowering text loss to 0.8% ) _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [avt] Use of redundancy in rfc2793bis text transm… Gunnar Hellström
- Re: [avt] Use of redundancy in rfc2793bis text tr… Colin Perkins
- RE: [avt] Use of redundancy in rfc2793bis text tr… Arnoud van Wijk
- [avt] Use of redundancy in rfc2793bis text transm… Gunnar Hellstrom
- RE: [avt] Use of redundancy in rfc2793bis text tr… Arnoud van Wijk
- RE: [avt] Use of redundancy in rfc2793bis text tr… Gunnar Hellstrom
- RE: [avt] Use of redundancy in rfc2793bis text tr… Gunnar Hellstrom
- Re: [avt] Use of redundancy in rfc2793bis text tr… Colin Perkins
- RE: [avt] Use of redundancy in rfc2793bis text tr… Gunnar Hellstrom
- Re: [avt] Use of redundancy in rfc2793bis text tr… Magnus Westerlund
- RE: [avt] Use of redundancy in rfc2793bis text tr… Arnoud van Wijk
- RE: [avt] Use of redundancy in rfc2793bis text tr… Gunnar Hellstrom
- Re: [avt] Use of redundancy in rfc2793bis text tr… Colin Perkins
- Re: [avt] Use of redundancy in rfc2793bis text tr… Colin Perkins
- RE: [avt] Use of redundancy in rfc2793bis text tr… Gregg Vanderheiden