74 CHAPTER 7: RUNNING NIC DIAGNOSTICS
If a LNK LED indicates a problem, check the following:
1 Ensure that your network hub or switch and the cable
connecting to your NIC comply with the speciļ¬cations
appropriate for your network connection.
2 Ensure that the hub or switch is powered on.
100 LNK
(link)
On
If drivers are installed,
the 100BASE-TX
or 100BASE-FX
connection is active.
Yes N/A N/A Yes N/A
If drivers are not
installed, the NIC is
receiving power.
Yes Yes Yes Yes N/A
Off
Something is
preventing the
connection between
the NIC and the hub
or switch.
Yes N/A N/A Yes
Blinking
The cable polarity
is reversed. Try a
different network
cable or contact your
system administrator.
Yes N/A N/A N/A N/A
ACT
(activity)
Blinking
Network traffic
is present.
Yes Yes Yes Yes Yes
Steady
Heavy network traffic
is present.
Yes Yes Yes Yes Yes
Off
No network traffic
is present.
Yes Yes Yes Yes Yes
Connector
LED State Meaning RJ-45 AUI BNC SC ST
book Page 74 Thursday, July 29, 1999 12:23 PM
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