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I have a D-Link Router/Switch set up and I have my desktop which connects fine at 100.0 MBps but on my other desktop with has a longer CAT-5 cable, connects fine but only at 10.0 MBps and user reports very slow, is that a Ethernet card problem, CAT-5 problem or settings problem?

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Last Post by DMR
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on the 10mb computer, have you looked to see if the network card settings are set to autonegotiate, and full duplex?

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As suRoot suggests, check the link speed and duplex settings in the network card's hardware properties. Also double-check that the card is using the correct driver.

If there doesn't seem to be a problem there:

- Switch the Ethernet cable with one that known to be in good working condition. Unless your cable is approaching the (approx.) 300' limit for 100Base-TX Cat5 wiring, length probably isn't your issue. However, a CAT5 cable can become incapable of operating at the full 100M if it has been excessively bent, kinked, stretched, etc., or if the RJ-45 connectors aren't crimped down tightly/correctly.

- Check the RJ-45 sockets on the card and router; make sure the contact "fingers" of the sockets aren't bent/damaged.

- Make sure the CAT5 cable is not running near sources of possible electromagnetic interference. Flourecent lighting circuitry, for example, is one very common culprit.

- Try another port on the router; you may have a "weak" or failing port.

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