Xref: utzoo comp.dcom.modems:2216 comp.sys.ibm.pc:17797
Path: utzoo!utgpu!attcan!uunet!husc6!bbn!rochester!pt.cs.cmu.edu!b.gp.cs.cmu.edu!ralf
From: ralf@b.gp.cs.cmu.edu (Ralf Brown)
Newsgroups: comp.dcom.modems,comp.sys.ibm.pc
Subject: Re: Direct modem line from USA to France?
Message-ID: <2603@pt.cs.cmu.edu>
Date: 5 Aug 88 16:36:32 GMT
References: <297@amanue.UUCP> <7651@cup.portal.com> <7752@cup.portal.com> <648@ontenv.UUCP>
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Organization: Carnegie-Mellon University, CS/RI
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In article <648@ontenv.UUCP> soley@ontenv.UUCP (Norman S. Soley) writes:
}In this arena there simply are no standards yet (V.32, no
}matter what it looks like to your computer, is half duplex between
}modems).

No, V.29 is half duplex.  V.32 is full duplex, 9600 bps each way.  Which is
why it requires such intricate echo-cancellation circuitry that the cheapest
V.32 modems are >$1500, and most are $3000.  The cheap 9600 bps modems such
as the USRobotics HST all use V.29 with proprietary extensions for quick
turnaround or a low-speed reverse channel.


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