Allied Telesis AT-LX3800U - Manual (Page 73)

AT-LX3800U Multi-Service Transport System Installation and Maintenance Guide
73
Line Card Line Side RX and TX LEDs are Flashing Green or Off
If one or both of the TX or RX LEDs for the LINE side of the line card is
flashing green continuously or off, do the following:
ˆ Verify that all fiber optic cables are securely connected to the RX and
TX ports.
ˆ Verify that the local TX port is connected to the RX port on the remote
system and that the local RX port is connected to the TX port on
remote system. The systems will not pass data if two TX or two RX
ports are interconnected.
ˆ Verify that the end nodes connected to the local and remote systems
are powered on.
ˆ Clean the fiber optic connectors following the instructions in Appendix
B, ”Cleaning Fiber Optic Connectors” on page 79.
ˆ Use a fiber optic tester (pass-through optical monitor) to verify that the
link attenuation is less than 35 dB.
For additional information about these LEDs, refer to Table 4, ”Line Side
TX and RX LEDs” on page 25.