Interphase Tech RAS Communications Controller 5536 User Manual
Page 139
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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...
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