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From: paul@actrix.co.nz (Paul Gillingwater)
Newsgroups: comp.dcom.modems
Subject: Re: V23 modems
Message-ID: <1990Aug29.072815.21929@actrix.co.nz>
Date: 29 Aug 90 07:28:15 GMT
References: <9008230705.AA02552@ucbvax.Berkeley.EDU> <3LE5EW2@xds13.ferranti.com> <359@saxony.pa.reuter.COM>
Organization: Actrix Public Access UNIX, Wellington, New Zealand
Lines: 17

In article <359@saxony.pa.reuter.COM> dgil@pa.reuter.COM (Dave Gillett) writes:
>When I was inquiring into v.23 modems to see what would be involved in
>supporting users in the UK, I was assured that the v.23 modems sold for
>home use there *all* fake the back channel to 1200 baud.  This seems like
>the right way to do it....

Sorry, but there do exist many V.23 modems which require the DTE
interface to talk to the back channel at 75 baud.  One clever chap
here in New Zealand managed to write a comms package which fakes 75
bps on an IBM PC by toggling lines directly (since the clock chip
doesn't have a divisor to do this). 

So, it *is* possible to use a 75 bps channel on a PC, if you've got
the right software.  It's mostly the cheaper V.23 modems which fail
to lock the DTE speed to 1200 bps.
-- 
Paul Gillingwater, paul@actrix.co.nz