Westermo MRD-330 - Manual (Page 15)

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Signal Strength Indicator
The Signal Strength Indicator reports the level of the received RF signal as well as any
network connection faults that occur. The signal strength is indicated by the number of
green flashes of the indicator within an indicator period. Each indicator green flash will
be followed by a short off time, an extended off time indicates the end of the indicator
period. So an indicator period starts with a green flash followed by up to 5 additional
flashes, then an extended off time, the cycle will then repeat. The maximum number of
flashes in an indicator period is 6.
The indicator may be red during the extended off time following the green flashes, this
indicates a network connection fault. The indicator will flash red if a SIM card is not
present and will be solid red if the RF circuitry is restarting, network registration has
failed or the RF signal level is too low for a connection.
When the unit is first switched on, or is reset the indicator will first light red, then flash
red in sequence with the Status Indicator, this is normal behaviour during boot-up and
does not indicate a fault.