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Path: utzoo!linus!decvax!tektronix!larryme
From: larryme@tektronix.UUCP (Larry Meneghin )
Newsgroups: net.lan,tek.lan
Subject: IEEE 802.3 jitter specs.
Message-ID: <4164@tektronix.UUCP>
Date: Wed, 14-Nov-84 14:15:19 EST
Article-I.D.: tektroni.4164
Posted: Wed Nov 14 14:15:19 1984
Date-Received: Fri, 16-Nov-84 01:40:25 EST
Organization: Tektronix, Beaverton OR
Lines: 17


Does anyone out there have a good interpretation of section 
6.6.2.2 of IEEE 802.3?  How do you come up with a signal 
generator that sends a legal packet;  preamble,  SFD,  and data, 
with 12 nS of jitter added to the preamble and 18 ns of jitter 
added to the data? 

What does the note mean?  Is it talking about a possible method 
of implementing the test?  Or is it talking about what kinds of 
real world signals we might expect to see?

Has anyone out there actually tested any boards or chips for 
their ability to accept jittery signals?  How did you generate 
the packets?  How did you generate the jitter?

Larry Meneghin
tektronix!larryme