RE: modems
"VILLARREAL, STEVE (SBC-MSI)" <sv9199@sbc.com> Wed, 04 September 2002 19:06 UTC
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From: "VILLARREAL, STEVE (SBC-MSI)" <sv9199@sbc.com>
To: Vernon Schryver <vjs@calcite.rhyolite.com>, ietf@ietf.org
Subject: RE: modems
Date: Wed, 04 Sep 2002 13:43:55 -0500
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Can someone forward a copy of the current v.90 standard ? I've been trying to find it on the web. Not successful though. Steve Villarreal Product Design e-mail: SV9199@sbc.com Phone: 210-886-3680 -----Original Message----- From: Vernon Schryver [mailto:vjs@calcite.rhyolite.com] Sent: Monday, June 17, 2002 8:37 AM To: ietf@ietf.org Subject: RE: modems > From: TOMSON ERIC <Eric.Tomson@siemens.atea.be> > ... > That's why V.90 could only exceed this limit (56.000bps in > downstream) by using compression techniques. > ... Doesn't v.90 exceed 30 Kbit/sec because in one direction it is not analog for a significant part of the path and plays games with the digital to analog convertors on the single local loop, and so has more than 3 KHz at 30 db to play with? Isn't v.42bis the modem compression standard? Hasn't anyone who has actually read the standards or used v.90 modems with v.32bis and done measurements seen better than 56 kbit/sec or at least noticed that v.42 and v.42bis can be turned on and off independently of each other and of the raw bit rate that v.90 negotiates? This whole thread is not only of limited relevance to this mailing list or much of anything in this century, but not as technically accurate as one might hope. Vernon Schryver vjs@rhyolite.com
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