Chapter 8: Troubleshooting

 

 

 

 

 

 

LED

Color

Meaning if the LED is ON...

 

 

 

4

Red

Loss Of Signal (LOS), indicating no electrical power is

 

 

detected on the line.

 

 

 

In their operational state, the LEDs are as follows:

LED Color State must be...

1 Green On

2 Green On

3 Yellow Off

4 Red Off

The following table describes the board status when the sequence of LEDs appears as follows:

LED1LED2LED3LED4

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.

 

 

 

 

 

5536 PRI RAS Communications Controller Users Guide

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