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From: smh@mit-eddie.UUCP (Steven M. Haflich)
Newsgroups: net.dcom
Subject: Re: Request for info on local building wiring
Message-ID: <3312@mit-eddie.UUCP>
Date: Sat, 15-Dec-84 14:31:14 EST
Article-I.D.: mit-eddi.3312
Posted: Sat Dec 15 14:31:14 1984
Date-Received: Sun, 16-Dec-84 06:30:56 EST
References: <243@decwrl.UUCP>
Reply-To: smh@mit-eddie.UUCP (Steven M. Haflich)
Organization: MIT, Cambridge, MA
Lines: 13

There seems agreement that four conductors suffice for most terminals,
but that RS232 to modems and other more exotic exotic may require.

In the particular case of modems, why not just run the phone line
directly to the user's location???  This will take fewer conductors than
even the most degenerate RS232:  two!!

Actually, certain types of phone service connections, e.g. RJ41S/45S,
use four, six, or more conductors.  The extras do things like indicate
whether the line should be conditioned for voice or data transmission,
Such services are likely to become more common as time passes.  Also,
many currently-available and plausible non-modem devices still require
more than four-wire RS232 -- certain printers for example.