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Posting-Version: version B 2.10.1 6/24/83; site chronon.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!decwrl!amdcad!chronon!eric
From: eric@chronon.UUCP (Eric Black)
Newsgroups: net.consumers
Subject: Re: RS phone cords and illuminated dials
Message-ID: <175@chronon.UUCP>
Date: Wed, 12-Mar-86 15:22:18 EST
Article-I.D.: chronon.175
Posted: Wed Mar 12 15:22:18 1986
Date-Received: Fri, 14-Mar-86 07:43:41 EST
References: <1850@hammer.UUCP>
Organization: Chronon Computer Corp., Mtn. View, CA
Lines: 17

> I have several AT&T phones with illuminated dials that light up even
> though I only connected two wires.  Durned if I know how they do it ...
> 
> -=- Andrew Klossner   (decvax!tektronix!tekecs!andrew)       [UUCP]
>                       (tekecs!andrew.tektronix@csnet-relay)  [ARPA]

These phones use high-output LEDs in series with the phone line.  The
voltage drop across the LEDs is low enough (~3V for 2 of 'em) that the
phone is not adversely affected.

-- 
Eric Black   "Garbage In, Gospel Out"
UUCP:        {sun,pyramid,hplabs,amdcad}!chronon!eric
VOICE:       (415) 941-0403
US SNAIL:    Chronon Computer Corp.
             2570 El Camino Real W.   Suite 206
             Mountain View, CA   94040