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From: mac@tesla.UUCP (Michael Mc Namara)
Newsgroups: net.dcom
Subject: Re: Noise Generator
Message-ID: <548@tesla.UUCP>
Date: Fri, 19-Apr-85 08:30:04 EST
Article-I.D.: tesla.548
Posted: Fri Apr 19 08:30:04 1985
Date-Received: Sat, 20-Apr-85 08:38:58 EST
References: <548@sfmag.UUCP>
Reply-To: mac@tesla.UUCP (Michael Mc Namara)
Distribution: net
Organization: Cornell University, Electrical Engineering Dept.
Lines: 28

In article <548@sfmag.UUCP> you write:
>
>I am looking for some sort of noise generator that will affect data transmitted
>over an Ethernet 50 ohm coax cable. I've called most of the instrument vendors
>with no success. ANY assistance will be appreciated.
>
>You may contact me at "attunix!asb".
>Tony Bartolomeo

	I can remember talking with a friend who is now working for AMD in Austin
Texas about a Ethernet -- noise problem.  He was System Manager at U of Texas,
and just about to leave to take a job with Motorolla, when suddenly the system
got all kinds of errors on the Ethernet link.  
	He tried everything, any kind of problem he could think of.  The University
was getting kind of pissed, 'cause he was soon leaving, and the problem wasn't
fixed. He pulled various cards in the backplane. (Seems they had a lot of
their own local additions to the computer.) No help.  He tried running an older
version of the kernal. No difference.  He re-did the connections. Nothing he 
tried helped.
	To shorten up the story, the problem wasn't in the computer, or the
computer room; the cable ran over a flouresent light in the ceiling of the hall
outside;  you know, the light that was flashing dimly?  Well, each flash 
the light made involved the ballast generating a huge magnetic field...


-------------------------------------
On a clear disk you can see forever ]   Michael Mc Namara @ cornell
-------------------------------------      mac@tesla