Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!sco!johnd
From: johnd@sco.COM (John Dubois)
Newsgroups: sci.electronics
Subject: Re: power from phone line
Keywords: phone, power, remote
Message-ID: <548@scorn.sco.COM>
Date: 7 Dec 89 17:44:05 GMT
References: <14230@jumbo.dec.com> <3542@kitty.UUCP>
Sender: news@sco.COM
Reply-To: johnd@sco.COM (John Dubois)
Organization: The Santa Cruz Operation, Inc.
Lines: 20


In article <3542@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>	If you are referring to a conventional subscriber telephone line
>at the remote site which you dial using the public switched telephone
>network, then you can obtain between 1 and 2 mA from the line when it
>is on-hook.
...
><> Larry Lippman @ Recognition Research Corp. - Uniquex Corp. - Viatran Corp.
><> UUCP  {allegra|boulder|decvax|rutgers|watmath}!sunybcs!kitty!larry
><> TEL 716/688-1231 | 716/773-1700  {hplabs|utzoo|uunet}!/      \uniquex!larry
><> FAX 716/741-9635 | 716/773-2488      "Have you hugged your cat today?" 

     How much current can you be sure you can draw before the phone
company decides the line is bad?  For example, if I was going to design a
commercial product, how much could I use?  Is there a specific minimum for
on-hook line impedance?

	John DuBois
	johnd@sco.com
	spcecdt@ucscb.ucsc.edu