Article View: sci.electronics
Article #3982Re: power from phone line
From: John Dubois
Date: Thu, 07 Dec 1989 17:44
Date: Thu, 07 Dec 1989 17:44
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1365 bytes
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
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Path: arc1-ca.pugleaf.net!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