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From: tnixon@hayes.uucp
Newsgroups: comp.dcom.modems
Subject: Re: V32 vs. HST
Message-ID: <3746.279dcb2a@hayes.uucp>
Date: 23 Jan 91 17:43:06 GMT
References: <2695@maestro.htsa.aha.nl> <3732.27958db2@hayes.uucp> <2114@proxima.UUCP>
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 29

In article <2114@proxima.UUCP>, lucio@proxima.UUCP (Lucio de Re)
writes: 

>>They wouldn't connect at all.  The HST doesn't have V.32 modulation. 
> 
> I beg to differ. The V.32 specification demands the ability to
> fallback to V.22bis, of which the HST is certainly capable. It
> will be necessary to program the modems to match, but essentially
> 2400bps is possible.

The currently published version of V.32 (1988) does _not_ include 
any requirement for fallback to V.22bis.  The 1992 version will not, 
either; however, the 1992 version _will_ include an _optional_ 
"Automode procedure".  This Automode appendix is also part of 
V.32bis.  It explains how modems which have both V.32 and V.22bis 
can communicate with other multimode, V.32, and V.22bis modems.  

The original question specifically said "V.32", and didn't ask about 
Automode modems.

The _reality_ is that most current V.32 products on the market also 
include fallback to V.22bis (and other modulations).  But this 
capability is not mandated by ANY standard.

-- 
Toby Nixon, Principal Engineer    | Voice   +1-404-449-8791  Telex 151243420
Hayes Microcomputer Products Inc. | Fax     +1-404-447-0178  CIS   70271,404
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