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From: chw@hpctdlb.HP.COM (Charlie Whiteside)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet diagnostic tools
Message-ID: <3260005@hpctdlb.HP.COM>
Date: 26 Jun 90 15:10:57 GMT
References: <1990Jun21.134653.5298@hellgate.utah.edu>
Organization: Hewlett-Packard CTD, Colo. Spgs.
Lines: 11

I have used HP 54112D Digital Scope with great success in this area.
The 54112 has a 64K deep capture buffer and samples up to 400 Msam/s.
This allows the user to see the amplitude and transmission effects of
a frame. It is especially useful when the trigger is set for the preamble
of a frame. If you place the scope at the end of a segment you can see
how low the amplitude of particular frames get ( At that end). It is
definitely a very low level application (you need to know 802.3 and 
related info such as transmission line theory) but can point out some
very tough problems that no other instrument can detect.