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From: grnberg@mit-caf.MIT.EDU (David R. Greenberg)
Newsgroups: sci.electronics
Subject: phone line specs
Message-ID: <5510@mit-caf.MIT.EDU>
Date: 19 Dec 90 16:16:08 GMT
Reply-To: grnberg@mit-caf.UUCP (David R. Greenberg)
Organization: Microsystems Technology Laboratories, MIT
Lines: 12

Hello there,

I realize that this may be a very common question, but I haven't read this
bulletin board for some time now.  Could somebody please post the
specifications for a standard phone line jack i.e. what the various voltages
are on the four wires during various phases of phone operation?

Thanks in advance for your help.

- David Greenberg
  Dept. EECS
  MIT