Interpreting Adapter LEDs

LED functions differ depending on whether the adapter is configured to operate in North America (with T1/PRI access), in European countries other than France (with E1/PRI access and CRC4), or in France (with E1/PRI access and no CRC type).

North America

In North America, the adapter LEDs for each port function are as follows:

LED

Color

Meaning if the light is ON...

 

 

 

1

Green

Clock is synchronized.

 

 

 

2

Green

Physical layer is active.

 

 

 

3

Yellow

Your ISDN provider is currently sending an RAI alarm

 

 

to the adapter.

 

 

 

4

Red

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

 

 

detected on the line.

 

 

 

In their operational state, the LEDs must be as follows:

LED Color State must be...

1 Green On

2 Green On

3 Yellow Off

4 Red Off

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Interphase Corporation