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Mark, Hmmmm...doesn't sound like a Layer 2 problem. Believe it or not, sometimes legacy apps are happier running at slower speeds. Try reducing the port down to 10/half and see what happens. Ron "Hurry up and wait!"

Ian, In case you were still wondering: The reason why split-pair Cat 5 cables work occasionally is mainly due to signal-to-noise ratio. Long cable runs & bad/weak NICs cause high attenuation (signal loss), combine this with a noisy cable (like your split-pair cable; which causes transmit pair...

Cat5 Split pairs mean that the Wiremap is incorrect when you made up the cables. A good Wiremap is: 1-2, 3-6, 5-4, 7-8 at both ends(wirecode T568B states: 1-Orange/White, 2-Orange, 3-Green/White, 4-Blue, 5-Blue/White, 6-Green, 7-Brown/White, 8-Brown). If you follow this scheme with all of your...

FYI: Prior to Cat5e (TIA/EIA 568-B) becoming a standard, there was a "reccomended" specification for testing Cat5 called: "E-Cat5 or Cat5Enhanced". This included the PSNext & Return Loss tests (which are needed for testing full duplex & four-pair wire transmissions over...

I've seen this problem before when the NIC and switch have problems negotiating auto & manual speed/duplex settings. Have you tried manually setting port configs on the switch?

FYI: Microtest is now a Fluke Networks aquired company. The DSP-4300 & OmniScanner 2 continue to be the top Fluke Networks line of certification tools for Cat 5/5e/6 and fiber. For more info visit: www.flukenetworks.com or www.microtest.com.

Hi jkeeper, Sounds like you need a hardware tool that troubleshoots layer 1 & 2 problems. Replacing hardware blindly is never a real solution. Layer 1 - It may be that there is impulse noise (motor or generator) nearby or faulty connectors causing the link to fail. Try using a cabling...