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Chapter 8: Troubleshooting
5536 PRI RAS Communications Controller Users Guide 119
In their operational state, the LEDs are as follows:
The following table describes the board status when the
sequence of LEDs appears as follows:
4 Red Loss Of Signal (LOS), indicating no electrical power is
detected on the line.
LED Color State must be...
1 Green On
2 Green On
3 Yellow Off
4 Red Off
LED1 LED2 LED3 LED4 Meaning
On On Off Off Board is operational.
On On On Off A synchronization problem occurred on
the ISDN carrier side.
Off Off Off On No power is detected on the line. Make
sure cable is plugged in correctly.
Off Off On Off Your ISDN provider is sending an AIS
alarm to the board.
LED Color Meaning if the LED is ON...