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Path: utzoo!watmath!clyde!akgua!mcnc!decvax!minow
From: minow@decvax.UUCP (Martin Minow)
Newsgroups: net.dcom
Subject: Re: UUUUUUUUUUUUUUUUUUUU -- maybe an answer?
Message-ID: <485@decvax.UUCP>
Date: Mon, 14-May-84 19:16:19 EDT
Article-I.D.: decvax.485
Posted: Mon May 14 19:16:19 1984
Date-Received: Tue, 15-May-84 02:44:14 EDT
References: <4644@amd70.UUCP>
Organization: DEC UNIX Engineering Group
Lines: 19

The UUUU pattern is an alternating 1010 bit pattern -- which might
help you track down the problem.

Another problem which I have seen on some cross-country calls is
a once-per-second garbage character, regular as clockwork.
The best explanation I have seen for this (which might not be
correct, of course) is that if the transmission is via a digitized
channel, and the sender and receiver clocks get out of synchronization,
the transmission-line hardware "steals" an 8-bit datum for resyncronization.
This just happens to force a 180-degree phase reversal into the signal,
which manifests itself as a garbage character on an otherwise idle line.

Sorry if this is inoherentt -- perhaps a more technically sophisiticated
reader could explain better.

Martin Minow
decvax!minow