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... |
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1 | Green | Clock is synchronized. |
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2 | Green | Physical layer is active. |
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3 | Yellow | Your ISDN provider is currently sending an RAI alarm |
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| to the adapter. |
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4 | Red | Loss Of Signal (LOS), indicating no electrical power is |
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| detected on the line. |
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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
68 | Interphase Corporation |