LAN and Telecom Cabling Ethernet Cable Woes - On and Off every second

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Subject Author Date
Ethernet Cable Woes - On and Off every second davetonge 02-19-07
Posted by Walter Mautner on February 27, 2007, 2:08 pm
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Al Dykes wrote:

....
> I still want to know ow the OP determined the "once a second" bit.
>
The blinkenlights on the switch or the network card?
However, the OP appears to have lost the thread.

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Posted by Walter Mautner on February 20, 2007, 6:47 am
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davetonge@yahoo.co.uk wrote:

> Hi
>
> I am having some problems with a 40m CAT5 ethernet cable.
> When I first installed the cable, I tested it and it was working with
> no problems. I haven't used it in 10 months, and when I went to
> reconnect it I am having a problem. The connection goes on and off
> roughly once a second. So it will be on for one second, and then off
> for one second - continuosly!
>
> What can cause this problem?
> Could it be interference?
>
Most probably it is a autonegotiation issue. Try to set fixed speed/duplex
modes on both ends, or try to change one NIC/driver combo.
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Posted by Wrolf on February 21, 2007, 8:01 pm
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On Feb 19, 8:20 pm, daveto...@yahoo.co.uk wrote:
> Hi
>
> I am having some problems with a 40m CAT5 ethernet cable.
> When I first installed the cable, I tested it and it was working with
> no problems. I haven't used it in 10 months, and when I went to
> reconnect it I am having a problem. The connection goes on and off
> roughly once a second. So it will be on for one second, and then off
> for one second - continuosly!
>
> What can cause this problem?
> Could it be interference?
>
> Please help!!!
>
> Thanks
>
> Dave
> daveto...@yahoo.co.uk


Very difficult for it to be interference. Is it Cat 5, stranded,
correct wiring (EIA/TIA 568B or 568A)?

Try isolating the problem with a laptop, Fluke, or other Ethernet
device. When you go through the cable, do you get the fault, or is it
only with the user equipment? If only with user equipment, then that
is the problem. Then move the test equipment to the other end of the
cable, plug in to the switch or whatever is at the other end using the
same patch cables. If you still have a problem, the cable is
innocent. Only if the problem only occurs when the cable is in the
path, blame the cable.

If the cable is indeed to blame, the chop off BOTH ends, reterminate,
and test with a tester. You should probably also test your tester
against some known working good cable. Make sure you use the strain
relief.

If it still does not work, chop of BOTH ends, and run new cables. You
might want to use the old cable as a wire drag, and get it out. Most
of the time you just leave the old one in there, but you definitely
want to chop off the ends to prevent accidentally using it.

Wrolf



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