I have three UTP cat 5e cables running from one building to anouther through an underground duct. Cable one is 30m, cable two is 30m and cable 3 is about 70 meters.
head office has a router that runs the network for the site, all three cables are conected to the same router, they run through the duct to the new building and off to three computers around the second building
Cable three works fine and the computer work happily allows pings and ip allocation via DHCP
Cable one and two will connect for about 2 seconds then drop it for about 15 and try to reconect. some times i get an ip most of the itme i dont. pings fail. The lights on the network cards are sometimes on but mostly off.
I have changed everything, the computers the ports on the router everything except the physical cable and it is the same issue.
I have ran my cable tester on the cables and they all pass so there are no breaks.
Does any one have any ideas, the cables follow the same route up until the point where cable 3 carrys on around the office.
I would assume if some gave me this problem that cable 3 would have the fault due to the length but it is the only one working.
the duct is empty apart from the three cables mentioned.
Thanks in advance.