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From: NJS@IBM.COM (Nicholas Simicich)
Newsgroups: comp.dcom.telecom
Subject: Periodic Line Noise
Message-ID: <080787.104413.njs@ibm.com>
Date: Sat, 22-Aug-87 22:31:40 EDT
Article-I.D.: ibm.080787.104413.njs
Posted: Sat Aug 22 22:31:40 1987
Date-Received: Sun, 23-Aug-87 15:01:14 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
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Approved: telecom@buit1.bu.edu

Someone who lives in or near Endicott, New York, is having the
following trouble with their home dial in terminal.  The terminal is a
PC on a call back system--thus, the terminal is not always the
originator of the noisy call, but may be, instead, in answer mode.  The
noise seems to occur no matter who is the originator.  I believe that
they are using 212A type modems.

I'd appreciate a direct response as well as a copy to the net if your
response is interesting (which it is, of course) as I'm a couple of
months behind in my digest reading :-).

-=-=-=-
I get a consistent, periodic (once every 2.1 seconds, I timed it) one
byte (X'7B' or X'FB'--not sure exactly which) inbound-only noise when
talking to PCTERM (an internal call back system), a local BBS, and a
university using either an internal package, PROCOMM 2.4.2, and
MS-Kermit and anything else I could test on.  Some connections are
clear and remain clear (the one session which started clean and became
dirty was explained by the Deposit Telephone Co. as a NY Telephone
line-configuration exercise one weekend).  The dirty ones stay dirty
and it's impossible to do any work. I tried another modem--no luck. The
Telephone Co. is stymied. Ideas?  I've also been assured that there are
no powerful radars nearby, etc.  I've used a pure vanilla PC DOS system
with the same results.  The Deposit phone company claims that my exchange,
693, is fairly modern, and that the microwave circuit is not the problem.

-=-=-=-
Nick Simicich, NJS@IBM.COM, or, for bitnet,
NJS at YKTVMX
Collect:(all I know about the problem is above) (914) 737-1908
Contents: 100% personal opinion, sugar, salt, High fructose
corn syrup...