Path: utzoo!censor!geac!torsqnt!hybrid!scifi!bywater!uunet!aurs01!luce
From: luce@aurs01.UUCP (J. Luce)
Newsgroups: comp.dcom.modems
Subject: Re: Line Noise Redux
Keywords: Line Noise
Message-ID: <59426@aurs01.UUCP>
Date: 11 Jan 91 15:56:38 GMT
References: <0B1gV2w163w@ersys.uucp> <59420@aurs01.UUCP> <1991Jan10.042007.4227@ims.alaska.edu>
Sender: news@aurs01.UUCP
Reply-To: luce@aurw46.UUCP (J. Luce)
Organization: Alcatel Network Systems, Raleigh NC
Lines: 75

In article <1991Jan10.042007.4227@ims.alaska.edu> floyd@ims.alaska.edu (Floyd Davidson) writes:
+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.

It is a CONTINUAL problem with occasional bursts AT the caller.

The repeating character is not a brace of any sort, either a checkmark
(IBM PC stuff) or a 2 letter combo that the extended PC char set assumes
is what it is printing.

Re:
Filter.
Someone (I think Toby Nixon) stated that there was a filter beast that I
could get that could help the problem (maybe). I would like to try that
also but no one has such a thing (filter AM radio signals, yes, but to
help what is on the line, no way). So anyone who can give me info on
this (either where to get 1 or how to make 1), it would be greatly
appreciated.

Nope, AT&T phone store, Radio Shack, and my local CompuAdd have no idea
where to get one.

I want to thank everyone for their help. I'll keep y'all updated.

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John Luce               | Life is the leading cause of death
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