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From: straka@ihlpf.UUCP
Newsgroups: comp.dcom.modems
Subject: Re: Reliability of Modular Jacks
Message-ID: <1140@ihlpf.ATT.COM>
Date: Tue, 24-Feb-87 09:22:15 EST
Article-I.D.: ihlpf.1140
Posted: Tue Feb 24 09:22:15 1987
Date-Received: Fri, 27-Feb-87 22:27:18 EST
References: <625@infinet.UUCP> <18600016@clio>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 12
Summary: Phone line voltages


I was under the impression that most (some, I KNOW) phone switches make
checks of the line for impedance, voltage, etc. BEFORE they ring the
line to ensure that neither party can hurt each other (within some
limits).  If some offending condition exists, the connection is not
made, and the originator sent to reorder, or something.

Maybe there is somebody out there who can shed some more light on the
subject.

-- 
Rich Straka     ihnp4!ihlpf!straka