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From: swb@DEVVAX.TN.CORNELL.EDU (Scott Brim)
Newsgroups: mod.protocols.tcp-ip
Subject: DELNI characteristics
Message-ID: <8609161257.AA06450@devvax.tn.cornell.edu>
Date: Tue, 16-Sep-86 08:57:16 EDT
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Posted: Tue Sep 16 08:57:16 1986
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   Date: Mon, 15 Sep 86 18:49:31 edt
   From: leong@andrew.cmu.edu (John Leong)

   .....
   The Intel 82586 chip has, by default, a check that is not really in
   conformance of the Ethernet spec. It measures the time between transmit and
   receiving the signal back from the transceiver and signals whether the round
   trip time equates roughly to 50 meter of drop cable (nothing to do with the
   Ethernet slot time of 51.2 micro seconds or roughly 2.5Km). This test is
   quite bogus ....

You can tell the chip to disable that feature.  I think it's *on* at
power-up.  Gould used to use the round-trip-to-transceiver check; we
asked them to disable it and I believe it's now off for all new Gould
ethernet boards.
								Scott