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From: jw7348@medtronic.com (Jeff Wilkinson)
Newsgroups: comp.dcom.telecom
Subject: Re: A Phone Set Wiring Question
Message-ID: <14933@accuvax.nwu.edu>
Date: 23 Nov 90 18:56:38 GMT
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X-Telecom-Digest: Volume 10, Issue 843, Message 8 of 9


In article <14787@accuvax.nwu.edu> hpubvwa!ssc!Tad.Cook@beaver.cs.
washington.edu writes:

>In article <14686@accuvax.nwu.edu>, zellich@stl-07sima.army.mil (Rich
>Zellich) writes:

>> On hooking up various phones I, too, found that one single-line phone
>> would take *both* lines off-hook.  This is a "novelty" phone - a

>The problem is, you have a phone that uses the outer pair
>(black/yellow wires) for the A and A1 leads, which short together when
>you go off hook.  You have this plugged into an RJ14 jack, which has
>the second line wired to the outer pair.  When the phone goes off
>hook, it uses the line hooked to the center pair, and shorts the outer
>pair.

It's also pretty common to ghost power in on the yellow/black for
lighted dials (like Princess phones).  Since the phone mentioned is a
novelty phone, it _may_ be looking for power on this pair.  The need
for power would probably be a fairly low impedance on this pair
(switched or unswitched) and would then take the second line off hook.
It seems to me that the wall transformer typically used for dial
lights was a 12VAC output.  Any IR's want to confirm or deny that?

>Rewire the jack so that only the red/green pair is active.  This will
>make it a standard RJ11 jack.  Then take the separate black/yellow
>pair, and wire it to the center pair (red green) of another jack.  The
>RJ14 type wiring should only be used with a two line phone that is wired
>for RJ14.

If that's the case, the best thing to do might be to rewire the jacks
as suggested above, but provide power on yellow/black for both jacks.
This will allow any single line phone to work on either jack, with or
without lights, etc.  Dual line phones still need two operational
pairs, of course.


Jeff Wilkinson    wilk@medtronic.com   Medtronic, Inc.
7000 Central Ave NE              Voice +1-612-574-3770
 My opinions are my own. Isn't that obvious by now?