Allied Telesis AT-DC2552XS, AT-PWR06, AT-FAN06 manual Troubleshooting

Chapter 7: Troubleshooting

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 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 either the cable or the other network device.

Use the switch’s management software to verify that the port is enabled. Refer to AT-DC2552XS Management Software Command Line Interface User’s Guide for information concerning specific commands.

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 input optical signal is too weak (sensitivity) or too strong (maximum input power).

Problem: The LINK/ACT LED for a QSFP+ transceiver is off.

Solutions: The fiber optic port on the module 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 QSFP+ transceiver and to the port on the remote network device.

Check that the QSFP module is fully inserted in the slot.

Verify that the operating specifications of the fiber optic ports on the QSFP+ 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 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 either the cable or the other network device.

Use the switch’s management software to verify that the port is enabled. Refer to AT-DC2552XS Management Software Command Line Interface User’s Guide for information concerning specific commands.

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