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Path: utzoo!watmath!clyde!cbatt!ihnp4!inuxc!pur-ee!uiucdcs!uxc.cso.uiuc.edu!clio!berger
From: berger@clio.UUCP
Newsgroups: comp.dcom.modems
Subject: Re: Reliability of Modular Jacks
Message-ID: <18600016@clio>
Date: Fri, 20-Feb-87 12:57:00 EST
Article-I.D.: clio.18600016
Posted: Fri Feb 20 12:57:00 1987
Date-Received: Mon, 23-Feb-87 01:41:59 EST
References: <625@infinet.UUCP>
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Nf-ID: #R:infinet.UUCP:625:clio:18600016:000:371
Nf-From: clio.Uiuc.ARPA!berger    Feb 20 11:57:00 1987


Normal ringing voltage is usually in the 90 - 100 volt range, but
the warning is good notwithstanding.  It's usually a 20 Hz. alter-
nating current.  Also keep in mind that phone lines have 45 volts
across them, and that the polarity changes when the phone is off
hook.  That's quite enough to damage most semiconductor equipment
improperly plugged into the phone line.