Rogue network cable Can't connect using switch

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?
5 answers Last reply Best Answer
More about rogue network cable connect switch
  1. what kind of switch is it that you are using?
  2. 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
  3. Best answer
    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
  4. Thanks. I'll try to change the plugs.

    Strange that the computer plugged in directly can handle it but not the switch.
  5. Best answer selected by krsnendu.
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