
Interpreting LEDs
E1/PRI Interface With CRC4
On cards with an E1/PRI interface and CRC4 (most European countries other than France), the LEDs for each port function as follows:
LED | Color | Meaning if the LED 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 sending an RAI alarm to the |
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4 | Red | Error: CRC4 not found. |
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In their operational state, the LEDs are as follows:
LED | Color State must be... |
1 Green On
2 Green On
3Yellow Off
4Red 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 | On | Your E1/PRI line does not support |
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| CRC4 functionality. Deselect the CRC4 |
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| option. (See Setting Up ISDN Port |
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120 | Interphase Corporation |