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Date: Thu, 21-May-87 17:30:41 EDT
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Posted: Thu May 21 17:30:41 1987
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From KAJOHN01%ULKYVX.BITNET%MIT-Multics.ARPA@XX.LCS.MIT.EDU  Thu May 21 10:27:17 1987
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Date:          Thu, 21 May 87 10:01 EDT
From: <KAJOHN01@ULKYVX.BITNET>
Organization:  University of Louisville
Subject:       Re: Regular Phone Chirp
To: telecom-request@xx.lcs.mit.edu
X-Original-To: telecom-request@xx.lcs.mit.edu
Status: RO

I have a home-brew piezoelectric ringer signal on my line and the same thing
happens, except it happens at 4:32am.  A long time ago, I had a simple on-hook
monitor which would listen to the phone line and run it through a small amp
to a speaker.  I would leave it running in my room to listen to the idle noise
on the line.  Well, one day I left it on my parents line, and they got a
"chunk-chunk" noise at about 11:00pm.  I put the speaker/amp on my line and
waited for 4:32am, and sure enough, I got the same "chunk-chunk", accompanied
by an obediant chirp from my piezo ringer.  So from this I deduced it must be
some sort of automated test sweep.  I am in a 1aESS if that helps any.
It sounds to me like the line is reversing polarity briefly, although I haven't
checked it with a meter yet.

David Harpe
KAJOHN01@ULKYVX.Bitnet