Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!hayes!tnixon From: tnixon@hayes.uucp (Toby Nixon) Newsgroups: comp.dcom.modems Subject: Re: Telebit T2500 - are they a good deal? Message-ID: <1805@hayes.uucp> Date: 6 Oct 90 17:58:11 GMT References: <14829@cbmvax.commodore.com> <69198@lll-winken.LLNL.GOV> <1990Oct4.144517.17005@elroy.jpl.nasa.gov> Organization: Hayes Microcomputer Products, Norcross, GA Lines: 42 In article <1990Oct4.144517.17005@elroy.jpl.nasa.gov>, cyamamot@kilroy.Jpl.Nasa.Gov (Cliff Yamamoto) writes: > Does anyone know when V.32bis will come out? Are there any modems out there > that will be upgradable to V.32bis with a simple ROM or board change? Is > V.32bis similar to 14.4K HST Link mode? V.32bis is scheduled to be voted on for accelerated approval at the 15-23 October 1990 meeting of CCITT Study Group XVII in Geneva. Barring unforeseen objections, it should pass. It is then sent out for a written ballot to all CCITT member countries. The ballot period will end around the end of February, 1991. Assuming the ballot at the meeting is unanimous, and the written ballot is 70% in the affirmative, V.32bis will be an official CCITT standard as of then (Feb '91). Only a couple of companies have announced V.32bis capability so far: Forval, Digicom, and Penril (that I'm aware of). These aren't as far as I know, V.32 modems that are upgradable to V.32bis, but are designed to be V.32bis from the start. The companies are taking a big risk by shipping products before the standard has even undergone it's first vote, especially since some of the negotiation parameters were changed just this summer. If you even think about buying one in advance of the finalization of the standard, be sure to get a commitment to upgrade to full compliance. V.32bis is similar in only one respect to the HST modulation scheme: the signal constellation at 7,200, 12,000, and 14,400. They're not at all compatible, however. The HST is asymmetrical (high speed one direction, low speed [300/450bps] reverse channel in the other), while V.32bis is full-duplex symmetrical with echo cancellation. Because V.32bis mandates backward compatible with V.32, you can talk at 9600 between a USR HST Dual Standard and a V.32bis modem, but not with an HST-only modem. -- Toby ----------------------------------------------------------------------------- Toby Nixon, Principal Engineer Fax: +1-404-441-1213 AT&T: !tnixon Hayes Microcomputer Products Inc. Voice: +1-404-449-8791 CIS: 70271,404 Norcross, Georgia, USA BBS: +1-404-446-6336 MCI: TNIXON UUCP: ...!uunet!hayes!tnixon Internet: hayes!tnixon@uunet.uu.net