Opengear OM2200 Series User Manual page 54

The signal bar color (not the number of bars) indicates signal strength:
Green if signal is above the higher threshold.
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Orange if signal is between lower and higher threshold.
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Red if signal is below the lower threshold,
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Grey for 0 or not active,
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5. Click the Refresh button to display the current signal strength of the active SIM.
CONFIGURE MENU 54