Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: tad@ssc.UUCP (Tad Cook)
Newsgroups: comp.dcom.telecom
Subject: Two-way Radio/Telephone Dispatch Interface
Message-ID: <12459@accuvax.nwu.edu>
Date: 21 Sep 90 18:19:59 GMT
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X-Telecom-Digest: Volume 10, Issue 668, Message 9 of 9


I am looking for a device that can go between the telco line side of a
key telephone system and a two-way radio system.  The operator of the
device pushes the line button on the key telephone associated with
this device, and audio from the radio system is patched into the
telephone.  The operator can then press a footswitch to key the
push-to-talk circuit of the radio, and talk over the radio using an
operator's headset that is part of the telephone.

I thought of using a ringdown circuit between a line position on the
key system and one of those simplex autopatches, but there must be a
simpler solution that does not require the ringing voltage from the
ringdown circuit, and provides it's own battery feed to the phone
system.  I also would not need the sampling that the simplex patch
provides which allows a mobile unit to access the phone system.  This
is a very simple patch that would be under control of the operator.

Is there a stand-alone unit that would do this?  I know that Plant
Equipment has a card (the 3134 KTU Radio Access) that does this, but
only as part of their whole key system.

If anyone has some thoughts on this and cannot reach me via email, you
can call me from 7:40am to 3:50pm Pacific Time weekdays at
800-824-9719 or 206-881-7000, and ask for PAUL COOK.


Tad Cook  Seattle, WA  Packet: KT7H @ N7HFZ.WA.USA.NA  Phone: 206/527-4089 
MCI Mail: 3288544      Telex: 6503288544 MCI UW  
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