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| Chapter 8: Troubleshooting |
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LED | Color | Meaning if the LED is ON... |
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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 are as follows:
LED Color State must be...1 Green On
2 Green On
3 Yellow Off
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 | 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 | On | Off | Your ISDN provider is sending an AIS |
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| alarm to the board. |
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5536 PRI RAS Communications Controller Users Guide | 119 |