Allied Telesis AT-GS2002/SP, Руководство по установке

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Chapter 3: Troubleshooting
48
SFP Port LINK/ACT LED Off
Problem: 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 media converter channel and to the port on the remote network
device.

Check that the SFP module is fully inserted in the slot.

Verify that the operating specifications of the fiber optic ports on
the SFP transceiver and the 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 eliminates the possibility that the port is connected to the
wrong remote network device, such as a powered-off 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.

If the remote network device is a managed device, use its
management firmware to determine whether its port is enabled.

Test the attenuation 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).

Verify that Switch 4 of the rear panel DIP switch is set to the same
speed as the SFP module that is installed.