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From: brian@ucsd.edu (Brian Kantor)
Newsgroups: comp.dcom.telecom
Subject: Re: Keeping a Line "Busy" Without a Phone Off Hook
Message-ID: <14990@accuvax.nwu.edu>
Date: 27 Nov 90 19:41:46 GMT
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In article <69299@bu.edu.bu.edu>, DAN@gacvx2.gac.edu (Dan Boehlke)
wrote:

> What is the best way to busy a phone line?  I have a bank of modems

Our modem lines all enter on RJ21 "punchblocks" so I've got some
rather nice clips that can be pushed over the terminals on the blocks
and make contact with the pair that I want to busy out.  Between the
two terminals on the clip I have a red LED and a 270 ohm 1/2w resistor
in series.  As long as I get the clip on the right way, it busies out
the line and lights up so I can see that I've got one of the lines
busied out.

Since most of our modems have error correction, I've even gotten away
with putting one of these on a line that's in use -- when the user
disconnects, the line remains busy and I can then pull the modem at my
leisure.  The modem's error correction fixes the blast of noise from
the clip as I slip it in.


Brian