D-4
Table D-1. Class A Fiber LED Displays (continued)
LED Pattern Possible Cause/Troubleshooting
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with connectors U17 and U19 on the fiber optic receiver
card. Check the following:
• Check to see if U17 and U19 are crossed. U17 must connect to U22 on the
fiber optic transmitter card, and U19 (on the receiver card) must connect to
U21 on the transmitter card.
• This LED pattern also occurs if both U17 and U19 on the receiver card are
unconnected.
LED 1 LED 2 LED 3
RX
TX
Indicates a problem with connectors U16 and U18 on the fiber optic receiver
card. Check the following:
• Check to see if U16 and U18 are crossed. U16 must connect to U20 on the
fiber optic transmitter card, and U18 must connect to U19 on the transmitter
card.
• This LED pattern also occurs if both U16 and U18 on the receiver card are
unconnected.
RX
TX
LED1 LED2 LED3
Indicates a problem with connectors U19 and U18 on the fiber optic receiver
card. Check the following:
• Check to see if U19 and U18 are crossed. U19 on the receiver card must
connect to U21 on the fiber optic transmitter card, and U18 must connect to
U19 on the transmitter card.
• This LED pattern also occurs if both U19 and U18 on the receiver card are
unconnected.
RX
TX
LED1 LED2 LED3
Indicates a problem with connectors U17 and U18 on the fiber optic receiver
card. Check the following:
• Check to see if U17 and U18 are crossed. U17 on the receiver card must
connect to U22 on the fiber optic transmitter card, and U18 must connect to
U19 on the transmitter card.
• This LED pattern also occurs if both U17 and U18 on the receiver card are
unconnected.
Class A LED Displays, Continued
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