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From: floydd@chinet.chi.il.us (Floyd Davidson)
Newsgroups: comp.unix.sysv386
Subject: Re: Wiring terminals 300 ft. from the computer
Summary: Twisted pairs on unbalanced circuits ??
Message-ID: <1990Sep25.052558.11002@chinet.chi.il.us>
Date: 25 Sep 90 05:25:58 GMT
References: <11774@bsu-cs.bsu.edu- <1990Sep19.083601.21364@pilikia.pegasus.com> <1142@atti07.ATT.COM>
Organization: Chinet - Chicago Public Access UNIX
Lines: 18

In article <1142@atti07.ATT.COM> rjw@atti07.ATT.COM (Ralph J. Winslow x7774) writes:
>->What type of wiring would be needed for this?  Would shielded be ...
>-
>-50 feet is supposed to be the max for serial cable, however I've seen runs
>-up to ~500 feet or so with no problems.  Your milage may vary.  4-wire is
>-usually good enuf, with a breakout box you can play with the signals and
>-figure out which ones your box and tubes require.
>
>That's true, but be careful to use twisted pairs if you use 4-wire.
>Actually, use twisted pair(s) whatever wire you use.
>

Pray tell what does using twisted pair wire do on an unbalanced
circuit?  Nothing.  Twisted pair will do wonders for common mode
rejection on balance telephone lines, maybe on RS-422, but nothing
for RS-232.

Floyd