Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!sjsca4!hood!jones
From: jones@hood (Clark Jones)
Newsgroups: sci.electronics
Subject: Re: power from phone line
Keywords: phone, power, remote
Message-ID: <1989Dec14.224737.25619@sj.ate.slb.com>
Date: 14 Dec 89 22:47:37 GMT
References: <3542@kitty.UUCP> <548@scorn.sco.COM> <3547@kitty.UUCP> <1989Dec9.220311.15928@phri.nyu.edu> <3550@kitty.UUCP>
Reply-To: jones@hood.UUCP (Clark Jones)
Organization: Schlumberger ATE, Tempe, AZ
Lines: 19

In article <3550@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>	Perhaps I did not make myself clear.  I was referring to "leakage",
>which means the amount of current flow in an ON-hook (i.e., telephone line
>idle) state.  In an OFF-hook state, one can draw as much current as the
>subscriber loop will allow, typically between 20 and 100 mA.
>
>	It appears that the orignal poster was referring to designing a
>telemetering device for data acquisition which would require power on a
>*continuous* basis, and therefore would draw power from the telephone line
>while it was ON-hook.

Hmm... maybe he could have a capacitor array that could support his system
for a couple of minutes, and then have his box dial its own number
every minute or so, and then "listen" to the busy signal for a while,
recharging the caps... or maybe if the "time" number in his area is free,
it could ring that up once in a while.  ;-) ;-) ;-) ;-)

Disclaimer:  The opinions expressed above are mine and not those of Schlumbrger
because they are NOT covered by the patent agreement!