Chapter 7: Troubleshooting
The following table describes the adapter status when the sequence of LEDs appears as follows:
LED1 | LED2 | LED3 | LED4 | Meaning |
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On | On | Off | Off | Adapter is operational. |
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On | On | On | Off | A synchronization problem occurred on |
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| the ISDN carrier side. |
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Off | Off | Off | On | No power is detected on the line. Make |
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| sure cable is plugged in correctly. |
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Off | Off | Off | Off | Your ISDN provider is currently sending |
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| an AIS alarm to the adapter. |
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Europe (Other than France)
In European countries other than France, 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 | Error: CRC4 not found. |
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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
3Yellow Off
4Red Off
iSPAN PRI PCI ISDN Users Guide | 69 |