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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: sci.electronics
Subject: Re: Drawing DC phone current
Summary: Telephone line leakage to ground
Keywords: SK2086, phones
Message-ID: <5002@kitty.UUCP>
Date: 3 Jun 91 04:49:39 GMT
Article-I.D.: kitty.5002
References: <8085@nst> <107170@sgi.sgi.com> <1991May31.135017.13702@specialix.co.uk>
Followup-To: sci.electronics
Organization: Recognition Research Corp., Clarence, NY
Lines: 18

In article <1991May31.135017.13702@specialix.co.uk> stevem@specialix.co.uk (Steven Murray) writes:
>>No *immediate* operational problem... However, in the nightly automatic test
>>scans [forgot the Telco acronym], your line will be flagged as "leaky", and
>>may eventually spit out a trouble ticket.
>
>Hey! Thats neat! Do you know what current the test flags as a leak?

	Convention in the telephone industry is to measure leakage to
ground in terms of resistance in ohms rather than current.

	The alarm threshhold for automatic line insulation test apparatus
is generally set between 50,000 ohms and 150,000 ohms - depending upon the
type of central office and the existing condition of its outside plant.
This corresponds to a current leakage of 0.3 to 1.0 mA.

Larry Lippman @ Recognition Research Corp.  "Have you hugged your cat today?"
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