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Solving LED Issues 75
■ If the connection is to a workstation, that
the workstation's network interface is
installed and configured correctly.
■ The correct category of cable is being used
for the required link speed. Category 3
cables can be used for 10BASE-T operation
only. Category 5 cable is required for
100BASE-TX or 1000BASE-T. 3Com recom
-
mends Category 5e or 6 cables for
1000BASE-T operation.
A fiber cable is connected, but the Module
Active LED is off.
Verify that:
■ The fiber cable is in good condition.
■ The SFP module is correctly inserted.
■ A 3Com SFP module is being used. Refer to
“Approved SFP Transceivers” on page 19 for
details.
■ The equipment at the far end is installed and
correctly configured.
The Link/Activity LED is on, but network
performance is poor
The Switch supports full-duplex autonegotia-
tion. If the connected device does not support
autonegotiation, ensure that it is configured for
half-duplex operation only. If the connected
device has autonegotiation disabled or overrid
-
den, and is configured as full-duplex, the
Switch will configure the link as half-duplex,
causing a mismatch that will reduce network
performance when data is transmitting and
receiving simultaneously on the same link.
Ensure that the connected device has either:
■ Autonegotiation enabled, or
■ The ports are configured for half-duplex
operation