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From: mlikier@telebit.com (Marty Likier)
Newsgroups: comp.dcom.modems
Subject: Re: Hayes announces Ultra 144 and V.32bis upgrade
Message-ID: <1991Jun27.195532.5461@telebit.com>
Date: 27 Jun 91 19:55:32 GMT
References: <5234@orbit.cts.com>
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In article <5234@orbit.cts.com> kurt@pnet51.orb.mn.org (Kurt Sletterdahl) writes:
>Pardon my dumbness, but why don't V.32bis modems have a DTE interface speed of
>57,600bps? I thought, with V.42bis data compression, that modems were supposed
>to have a DTE that was four times the modulation rate. Thanks in advance for
>your patient response.
>
DISCLAIMER: I am not a modem engineer! However 2 reasons come to my mind.
(1) V.42bis is probably the most intensive computational process within
the modem. And it is as simple as one vendor implementing V.42bis better
than another.(Or vice-a-versa) (2) the RS232 standard is spec'd at 19,200
and for a modem interface speed of 57,600, it  requires special line drivers
and receivers.

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