Chapter 8: Troubleshooting
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Problem 3: The stack ID LEDs on the switches of the stack are flashing
the ID numbers and the letter “H” every few seconds.
Solution: This is normal for the LEDs when the switches are operating in
a stack configuration.
Problem 4: All of the port LEDs are off even though the ports are
connected to active network devices.
Solution: The LEDs may have been turned off. To toggle on the LEDs,
press the eco-friendly button on the front panel. It is important to know that
the eco-friendly buttons on the switches in a stack turn on and off the
LEDs only on their respective units.
Problem 5: A twisted pair port on the switch is connected to a network
device but the port’s LINK/ACT LED is off.
Solutions: The port is unable to establish a link to a network device. Try
the following:
Verify that the network device connected to the twisted pair port is
powered on and is operating properly.
Verify that the port is connected to the correct twisted pair cable.
This is to eliminate the possibility that the port is connected to the
wrong network device.
Try connecting another network device to the twisted pair port with
a different cable. If the twisted pair port is able to establish a link,
then the problem is with the cable or the other network device.
Verify that the twisted pair cable does not exceed 100 meters (328
feet).
Verify that you are using the appropriate category of twisted pair
cable. The cable types are listed in Table 6 on page 31 for the 10/
100Base-TX ports and Table 7 on page 33 for the 10/100/
1000Base-T ports.
Note
A 1000Base-T connection may require five to ten seconds to
establish a link.
Problem 6: The LINK/ACT LED for an SFP transceiver is off.
Solutions: The fiber optic port on the transceiver is unable to establish a
link to a network device. Try the following:
Verify that the network device connected to the fiber optic port is
operating properly.
Verify that the fiber optic cable is securely connected to the port on
the SFP module and to the port on the remote network device.