Allied Telesis AT-LX3800U - Manual (Page 72)

Chapter 3: Troubleshooting
72
RDY LED on a Line Card is Off
If the RDY LED on a line card is off, do the following:
ˆ Verify that at least one power supply is operational.
ˆ Verify that the On/Off switch at the back of the system is turned to On.
ˆ Verify that the AT-LX3811/x line card is firmly inserted in the slot.
For more information about the RDY LED, refer to Table 2, ”RDY LED” on
page 23.
RDY LED on a Line Card is Flashing
If the RDY LED on a line card is flashing, do the following:
ˆ Verify that the line card is in the correct slot: the color and number of
the line card should match the color and number of the slot. If the line
card is not in the correct slot, move it to the correct slot.
ˆ Remove and reinsert the line card.
Line Card Tributary Side (SFP) RX and TX LEDs are Off
If one or both of the TX and RX LEDs on the tributary (SFP) side of the line
card are off, do the following:
ˆ Verify that the device connected to the SFP is powered on.
ˆ Verify that the corresponding remote end node connected to the
remote system is powered on.
ˆ Verify that the SFP is firmly seated in the SFP slot.
ˆ Verify that the fiber optic cable is securely connected to the SFP and to
the port on the end device.
ˆ Verify that you are using the appropriate type of fiber optic cable. Refer
to the SFP installation guide for cabling specifications.
ˆ Clean the fiber optic connectors following the instructions in Appendix
B, ”Cleaning Fiber Optic Connectors” on page 79.
ˆ If the SFP has a dual LC connector, verify that the fiber strand
connected to the RX port is connected to the TX port on the remote
end device, and that the fiber strand connected to the RX port is
connected to the TX port.
For additional information about these LEDs, refer to Table 3, ”Tributary
Side TX and RX LEDs” on page 24.