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Chapter 6: Troubleshooting
SFP Slots
82
Problem: The LINK/ACT LED for an SFP transceiver is off.
Solutions: The fiber optic port on the transceiver cannot establish a link to
a network device. Try the following:
Verify that the remote 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.
Check that the SFP transceiver is fully inserted in the slot in the
switch.
Verify that the operating specifications of the fiber optic ports on
the transceiver and remote network device are compatible.
Verify that the correct type of fiber optic cabling is being used.
Verify that the port is connected to the correct fiber optic cable.
This is to eliminate the possibility that the port is connected to the
wrong remote network device.
Try connecting another network device to the fiber optic port using
a different cable. If the port is able to establish a link, then the
problem is with the cable or with the other network device.
Use the switch's management software to verify that the port is
enabled.
If the remote network device is a managed device, use its
management firmware to verify that its port is enabled.
Test the attenuation of both directions on the fiber optic cable with
a fiber optic tester to determine whether the optical signal is too
weak (sensitivity) or too strong (maximum input power).
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