3Com Baseline 2426-PWR Plus User Manual page 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
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
for
Solving LED Issues 75