NEC 1000BASE-T User Manual page 38

Common problems and solutions
Diagnostics pass but the connection fails or an error occurs
Use a twisted pair cable to connect this adapter. Especially to use for 1000 Mbps, use a
twisted pair cable of CAT 5e or better.
Also, make sure that the cable is securely attached.
Make sure that the communication mode (full duplex/half duplex) on the adapter matches that
on link partner.
Link LED stays off
Make sure you loaded the network driver.
Check all connections at the adapter and link partner.
Try another port on the link partner (such as hub/switch).
Make sure the communication rate on the adapter matches that on the link partner.
Make sure that the cable between the adapter and link partner is the proper type. If you use
this adapter at 1000 Mbps, use a CAT 5e cable or better.
Make sure no foreign object is in LAN port.
Confirm that your twisted pair cable is 4 pair type.
The adapter stops working without apparent cause
Try reseating PCI riser card and adapter.
The driver files may be damaged or deleted. Remove and reinstall the driver.
If the problem persists even after you checked the above items, something may be wrong with
this adapter. Contact your sales agent.
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