D-3
Table D-1. Class A Fiber LED Displays
LED Pattern Possible Cause/Troubleshooting
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with the Class A connection between U17 on the fiber optic
receiver card and U22 on the fiber optic transmitter card. Check the following:
• Check the U17 and U22 connectors. Make sure that they are securely
attached to the receiver or transmitter card. A problem with either of these
connectors causes this LED pattern.
• Check the integrity of the fiber connection running between U17 and U22.
A break or defect in the fiber running between these connectors causes this
LED pattern.
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with the Class A connection between U18 on the fiber optic
receiver card and U19 on the fiber optic transmitter card. Check the following:
• Check the U18 and U19 connectors. Make sure that they are securely
attached to the receiver or transmitter card. A problem with either of these
connectors causes this LED pattern.
• Check the integrity of the fiber connection running between U18 and U19.
A break or defect in the fiber running between these connectors causes this
LED pattern.
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with the Class A connection between U19 on the fiber optic
receiver card and U21 on the fiber optic transmitter card. Check the following:
• Check the U19 (the one on the fiber optic receiver card) and U21
connectors. Make sure that they are securely attached to the receiver or
transmitter card. A problem with either of these connectors causes this
LED pattern.
• Check the integrity of the fiber connection running between U19 and U21.
A break or defect in the fiber running between these connectors causes this
LED pattern.
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with the Class A connection between U16 on the fiber optic
receiver card and U20 on the fiber optic transmitter card. Check the following:
• Check the U16 and U20 connectors. Make sure that they are securely
attached to the receiver or transmitter card. A problem with either of these
connectors causes this LED pattern.
• Check the integrity of the fiber connection running between U16 and U20.
A break or defect in the fiber running between these connectors causes this
LED pattern.
Continued on next page
Class A LED Displays
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