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From: julian%bongo.UUCP@nosc.mil (Julian Macassey)
Newsgroups: comp.dcom.telecom
Subject: Re: Two-Line Adaptor Wanted For One-Line Phone
Message-ID: <16166@accuvax.nwu.edu>
Date: 17 Jan 91 14:38:44 GMT
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Reply-To: Julian Macassey <julian@bongo.info.com>
Organization: The Hole in the Wall  Hollywood California U.S.A.
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X-Telecom-Digest: Volume 11, Issue 46, Message 11 of 13


In article <16043@accuvax.nwu.edu> greg%turbo.atl.ga.us@mathcs.
emory.edu (Greg Montgomery) writes:
X-Telecom-Digest: Volume 11, Issue 36, Message 5 of 11

>I am getting another phone line installed in my house this week, and I
>am looking for a device I could attach to the phone and both lines and
>I can hit a button to switch between lines. Radio Shack used to sell a
>device that did this. It had two inputs for the phone lines, and one
>for the telephone. You would hit a button to flip from line one to
>line two and vice versa. However, they don't sell it anymore. Does
>anyone know if anyone still sells one of these, or if they are pretty
>easy to make, how to make one??

	What you need is a Double Pole Double Throw switch (DPDT). You
will also need Jacks and wire. You can also build the switch into the
phone, this saves money on jacks. To build it into the phone, wire the
wall jack for both lines, use a 4 conductor phone cord and place the
switch between the jack in the phone and the hookswitch.

	Note that with this arrangement only the phone line currently
switched to the phone will ring on that instrument. You may consider
adding a second ringer for the second line.

	You can make this box as fancy as you want with hold buttons,
LEDs, etc.


Julian Macassey, n6are  julian@bongo.info.com  ucla-an!denwa!bongo!julian
N6ARE@N6YN (Packet Radio) n6are.ampr.org [44.16.0.81] voice (213) 653-4495