trb@stag.UUCP ( Todd Burkey ) (06/05/87)
This is actually two questions. I have an interest in setting up diagnostics
to check out an ethernet board and connection to the transceiver with or
without other systems on the line. Basically I need info on what kind of
diagnostics are necessary and how they are usually accomplished. Note that
these are diagnostics that will likely be made resident on an SBC type card
an may eventually work hand in hand with a utility like netstat or netdiag
at a host level. Is there anyone out there who can help/hint?
Also, I was wondering how breaks in the ethernet cable are so precisely
pinpointed by software on unix? (ala...I recall messages like: Connection
failed-You have a break in your cable 24 meters from node x). I assume that
some sort of signal reflection measurement was used, but wasn't sure if this
was done by the host software or some fancy code on the etherne board itself.
Thanks in advance for any help.
-Todd Burkey
ihnp4!meccts!stag!trb
(don't do a trb@stag.UUCP, since my map keeps getting
lost by the local net gods...should be out again soondp@JASPER.PALLADIAN.COM (Jeffrey Del Papa) (06/05/87)
Date: 5 Jun 87 07:09:17 GMT
From: umnd-cs!umn-cs!meccts!nis!stag!trb@rsch.wisc.edu ( Todd Burkey )
Also, I was wondering how breaks in the ethernet cable are so precisely
pinpointed by software on unix? (ala...I recall messages like: Connection
failed-You have a break in your cable 24 meters from node x). I assume that
some sort of signal reflection measurement was used, but wasn't sure if this
was done by the host software or some fancy code on the etherne board itself.
Thanks in advance for any help.
-Todd Burkey
ihnp4!meccts!stag!trb
(don't do a trb@stag.UUCP, since my map keeps getting
lost by the local net gods...should be out again soon
Some ethernet intrface cards (all the older interlan?) have a builtin TDR (time domain
reflectometer) which if you incant the right thing at the card will find breaks and
shorts.
<dp>