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Iridium OpenPort Terminal- Power LED off.
Summary:

This article describes what to do when power LED is off.
Article:

Article LED power Colour Off (No Colour) Cause No power supplied to BDE
Resolution:

Get a qualified person to check the power being supplied to the BDE, it should be between 11 – 32VDC at the input to the BDE and capable of providing up to 50W.