![](/images/backgrounds/146446/146446-244142x1.png)
Interpreting LEDs
LED | Color State must be... |
4 Red Off
The following table describes the board status when the sequence of LEDs appears as follows:
LED1 | LED2 | LED3 | LED4 | Meaning |
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On | On | Off | Off | Board is operational. |
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On | Off | On | Off | Your E1/PRI line requires CRC4. Select |
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| the CRC4 option. (See Setting Up ISDN |
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On | Off | Off | Off | Your E1/PRI line requires CRC4. Select |
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| the CRC4 option. (See Setting Up ISDN |
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Off | Off | Off | Off | Either no electrical signal is on the |
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| E1/PRI line, or your ISDN provider is |
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| sending an AIS alarm to the board. |
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| Make sure your cable is plugged in |
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| correctly. |
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122 | Interphase Corporation |