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Rogue network cable Can't connect using switch

Last response: in Networking
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February 19, 2012 9:16:34 PM

Hi,
I have an underground cable connecting a classroom to the main server.

If I plug any computer directly into the underground cable it connects to the server fine.

If I plug a switch into the cable, none of the computers connected to the switch gets an IP address from the server. When I try to assign manual IP addresses I also can't connect.

But when I use the same switch and plug it into the server using a shorter cable everything works.

What could be the problem? Could it be a cross over vs straight through wiring problem? Any other suggestions?
February 19, 2012 10:37:19 PM

what kind of switch is it that you are using?
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February 19, 2012 11:25:55 PM

Just a regular 8 port switch with uplink. I have tried using uplink. It made no difference. I also tried using a 4 port switch with wireless.

I have a feeling there is something round with the cable. Good enough to work directly to a computer but not through a switch.

I used a cable tester and got these results:
Lights the lit up.
Sending unit
123456 8
Receiving unit
12 8 3 654
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Best solution

February 19, 2012 11:41:16 PM

it is the wire that is wrong.

for cross over it should show:
12345678 T568B
36145278 T568A

for the regular it should show:
12345678 T568B
12345678 T568B

http://en.wikipedia.org/wiki/TIA/EIA-568-B
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February 20, 2012 1:46:34 AM

Thanks. I'll try to change the plugs.

Strange that the computer plugged in directly can handle it but not the switch.

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February 27, 2012 9:36:13 PM

Best answer selected by krsnendu.
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