Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!decwrl!hayes.ims.alaska.edu!floyd
From: floyd@ims.alaska.edu (Floyd Davidson)
Newsgroups: comp.dcom.modems
Subject: Re: Line Noise Redux
Keywords: Line Noise
Message-ID: <1991Jan10.042007.4227@ims.alaska.edu>
Date: 10 Jan 91 04:20:07 GMT
References: <1991Jan7.211230.8874@svc.portal.com> <0B1gV2w163w@ersys.uucp> <59420@aurs01.UUCP>
Organization: University of Alaska, Institute of Marine Science
Lines: 47

In article <59420@aurs01.UUCP> luce@aurw46.UUCP (J. Luce) writes:
[...]
>
>After harrassing SoBell to get me off my current line card, I found I
>was on a SLC-96 attached to an AT&T FP-20 (??? not sure). Anyway, it is
>the oldest switch in the Raleigh area and is ANALOG. Since the move to a
>new frame and a new line card, the problem is the same. Supposedly I am
>on copper all the way to the switch (I find it AMAZING no one knows for
>sure...).
>
>OK, let's assume I am, is the T-clock still a valid concern. Since the
>change of line card, the noise persists but now is of repeating
>characters and not just a jumble of characters.
>
>Thanks for the help...

Wow this is really getting interesting.

I'm not familiar at all with the various kinds of line carrier or
line extenders.  Or for that matter with ATT switches.  I don't
know what an SLC-96 or an AT&T FP-20 are.

I find it more than amazing if no one knows what kind of a loop you
are on.  More like the individuals you are talking to don't want to
bother looking it up.

One thing needs to be clarified.  Is this *always* and only in
one direction?  Say like in a ten minute period how many hits do
you get in each direction?

The single character being displayed sounds very much like clock
slips on a T1 carrier.  Usually it is '}}}}}}}'  or '{{{{{{{{'
I can't remember which.  With maybe on odd character at the start
or end of the string.

If you are getting a pattern like that and it is an analog switch,
then you must have some kind of a digital loop extender on your
line.

Once again, it still sounds like a 4 wire circuit problem, not
noise on your 2 wire drop.

Floyd
-- 
Floyd L. Davidson                                  floyd@ims.alaska.edu
Salcha, AK 99714                    paycheck connection to Alascom, Inc.
 When I speak for them, one of us will be *out* of business in a hurry.