network environment is much more demanding than simply conducting
did you also check the cable for shorts? (ie make sure that each wire in one
end is only connected to one at the other end)

the cable might have some worn insulation or something giving it too much
capacatance or anything of a hundred things
a bad connection
not enough fish sacrificed during the creation of the cable
cable made during the Cat-3 phase of the moon not Cat-5
-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of john chung
Sent: Monday, March 29, 2004 11:10 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [OT:] Serious network problem


Hi there,

    I have the strangest problem with my network that I have been
fiddling with currently.
Here goes.

    I have a cable that is 10 meters long that would not work for some
computers at all.
The test machine is a P133 with an Intel Pro 10/100B/100+ Ethernet. Even
a newer machine
 from IBM with a realtek card could not detect the network at all. The
status light on the nic
was blinking when the LONG cable was connected but there wasn't any
communication with the
local network. Couldn't even ping my local network machines. The LONG
cable was attached to
the floor's switch located in the server room. *The cable tested okay
for connectivity when using a
multimeter *

   The problem was solved when I used a shorter cable???? Can some one
explain this strange behaviour?

*I have used another cable around the same length and it worked!!!! Both
are Cat 5E cables.....*

Thanks,
John

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