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From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Newsgroups: comp.sources.d
Subject: Re: Pending FCC ruling threat to modem users
Message-ID: <442@omen.UUCP>
Date: Sat, 20-Dec-86 20:34:09 EST
Article-I.D.: omen.442
Posted: Sat Dec 20 20:34:09 1986
Date-Received: Sun, 21-Dec-86 03:49:44 EST
References: <1572@brl-adm.ARPA> <3454@curly.ucla-cs.UCLA.EDU> <488@enmasse.UUCP>
Reply-To: caf@.UUCP (PUT YOUR NAME HERE)
Organization: Omen Technology, Portland
Lines: 14

In article <488@enmasse.UUCP> guy@enmasse.UUCP (The Computer Guy) writes:
:> Modems use the same lines as voice.
:>
:This is true, but they soak up a much higher bandwidth than voice.  If you
:are multiplexing telephone signals on a single channel, a modem signal
:reduces the number of simultaneous conversations you can carry.  Apologies
:if this point has already been made.

A 212 or v.22bis modem signal fits well within a standard telephone voice
channel, it does not take up more bandwidth.

While there are some multiplexing schemes that are more heavily loaded by
a -12 dbm modem signal than by a voice signal with peaks 10 or 20 db higher,
I doubt that many local calls would involve such high value mux gear.