Each LED on the rear of the Control Unit (CU) indicates a particular condition or status for the device. See the table below for details about each meaning.
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Control Unit's LEDs |
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Port/LED |
Description |
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CrewNet LEDs |
Left |
Green – CrewNet connection is good. |
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Off – No CrewNet connection detected. |
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Right |
On (Green) – 1000 Mbps link is detected. |
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Blinking (Green) – Activity is detected. |
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Off – No CrewNet connection detected. |
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LAN LEDs |
Left |
Green – LAN link is connected. |
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Off – No LAN connection detected. |
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Right |
Blinking (Amber)– LAN activity is detected. |
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Off – No LAN activity detected. |
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Sync LEDs |
Left |
Green – Sync connection is good. |
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Red – Sync connection has a problem (e.g., when a CrewNet connection is made to the sync port of a non-primary CU). |
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Off – No Sync connection detected. |
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Right |
On (Green) – 1000 Mbps link is detected. |
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Off – No Sync connection detected. |
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| Sync LEDs (Fiber) |
Left |
Not used |
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Right |
On (Green) – Sync connection is good. |
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Off – No Sync connection detected. |
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Note: The left LED on the Sync In copper connection will be lit on the Primary CU only. In a multi-CU system all other non-primary Sync In LEDs will not be lit, indicating they do not accept a Sync (CrewNet) Input.