Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!pasteur!ucbvax!PYR.GATECH.EDU!davidc
From: davidc@PYR.GATECH.EDU (David Carter)
Newsgroups: comp.dcom.telecom
Subject: Re: Call Waiting Indication
Message-ID: <5433@pyr.gatech.EDU>
Date: 15 Apr 88 16:10:49 GMT
References: <2844@emory.uucp>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: Georgia Institute of Technology
Lines: 28
Keywords: call waiting
Summary: maybe- battery drop detect
Approved: telecom@xx.lcs.mit.edu


In article <2844@emory.uucp> km@emory.UUCP (Ken Mandelberg) writes:
>Is there any way to get a call waiting indication other
>than the standard short beep.
>Ken Mandelberg      |  {decvax,sun!sunatl,gatech}!emory!km  UUCP

Maybe.  If your phone system supplies a battery drop (heard as a loud click
just before the call waiting beep; much of Atlanta does, but some "digital"
offices don't) then you can add an inexpensive device to detect the battery
drop.

The device is a "battery detect relay."  It has two coils that go in series
between the incoming phone line and (in this case) your modem.  While there
is battery on the line (call is up) a SPST contact is held closed.  So when
you get a call waiting the switch will open briefly.  Wire the switch to
whatever else you like (loud buzzer, big light, something to give you a
shock, etc.).

Delta Electronics in Atlanta probably still has them.

David Carter
Georgia Insitute of Technology, Atlanta Georgia, 30332
uucp: ...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!davidc
ARPA: davidc@pyr.ocs.gatech.edu
-- 
David Carter
Georgia Insitute of Technology, Atlanta Georgia, 30332
uucp: ...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!davidc
ARPA: davidc@pyr.ocs.gatech.edu