Installation Guide for the Model FE104 and Model FE108 Fast Ethernet Hubs
4-2
Troubleshooting
Port connection not
functioning
Link/Rx LED off
or intermittent
Make sure that the network adapter card installed in the PC
is in working condition and that the computer and hub are
turned on. Verify that the network adapter card is100 Mbps
capable and that the 100 Mbps LED and Link LEDs are on at
the network adapter card in the PC.
If the Link/Rx LED is not lit after cabling has been installed,
check that the proper cable is installed, and check for
miswired cable pairs or loose connectors. Be sure that there
is power to both the hub and the connected PC.
Problems with Port 4
on the Model FE104
hub or with Port 8 on
the Model FE108 hub
Link/Rx LED off
Check the Normal/Uplink push button on the front panel.
If you are using a straight-through cable connected to a PC
or other MDI-wired device, make sure the Normal/Uplink
push button is set in the Normal position.
If you are using a straight-through cable connected to a
router or another hub, make sure the Normal/Uplink push
button is set in the Uplink position.
Try the alternate position of the Normal/Uplink push button to
turn the Link/Rx LED on.
Col (collision) LED
blinking
Col LED on
Collisions are normal on Ethernet networks and occur when
two or more computers transmit data on the network
simultaneously. Computers that caused the collision retry
transmission at different intervals until the transmission
succeeds. Excessive collisions can result when multiple hubs
are connected and when many computers are connected on
the network. Incorrect cabling, connectors, and wiring
techniques are other causes for excessive collisions.
Table 4-1.
Troubleshooting (continued)
Symptom
Activity
Check