Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: John Higdon Newsgroups: comp.dcom.telecom Subject: Re: Reverse-voltage Phone Line Test Message-ID: <6200@accuvax.nwu.edu> Date: 9 Apr 90 06:39:01 GMT Sender: news@accuvax.nwu.edu Reply-To: John Higdon Organization: TELECOM Digest Lines: 21 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 242, Message 9 of 9 In article <5900@accuvax.nwu.edu> uop!quack!mrapple@ucdavis.ucdavis.edu (Nick Sayer) writes: >If I'm up late at night, I sometimes hear a short beep from the phone. In many central offices, there is an automatic testing system that goes through every idle line in the office and tests for resistance between conductors (leakage) and resistance to ground. The voltages used for the test will frequently cause "bell taps" or a short ring in telephones that do not meet spec for ringer hysterisis and sensitivity. I have never experienced that phenomenon here, but then it's possible my CO doesn't run the tests. Also, I have never had any [Time Magazine] phones on the line, either. John Higdon | P. O. Box 7648 | +1 408 723 1395 john@bovine.ati.com | San Jose, CA 95150 | M o o !