Mobile network type LEDs
The mobile network type LEDs are located near the SIM card slot.
They display which type of Internet connection is currently active.
Action Description
2G LED turned on Device is connected to a 2G network.
3G LED turned on Device is connected to a 3G network.
4G LED turned on Device is connected to a 4G network.
2G blinking Device is connected to a 2G network but hasn't received an IP address.
3G blinking Device is connected to a 3G network but hasn't received an IP address.
4G blinking Device is connected to a 4G network but hasn't received an IP address.
All LEDs blinking at the same time every 500 ms No SIM card or incorrect PIN.
All LEDs turn on and off in a sequence one after the other The device is attempting to connect to a mobile network operator.
Mobile signal strength indication LEDs
The mobile signal strength indication LEDs are located near the SIM card slot.
The number of lit up LEDs represents a different mobile signal strength (RSSI) value in dBm.
No. of lit up LEDS Signal strength
0≤ -111 dBm
1 -110 dBm to -97 dBm
2 -96 dBm to -82 dBm
3 -81 dBm -67 dBm
4 -66 dBm to -52 dBm
5 ≥ -51 dBm
The Mobile signal strength LEDs can also be used as a time indicator for holding the reset
button. When you press and hold the reset button, if there is a User's default configuration
configured on the device, you have to hold it pressed for 6 seconds (by default) to initiate a User's
default configuration reset and 12 seconds (by default) to initiate a Factory reset. Otherwise, it
is only necessary to hold the reset button for 6 seconds to trigger a Factory reset. If the button was
held down longer than 20 seconds (by default) no action will be taken.
While holding the reset button each lit up signal strength LED indicate that a period of two seconds
has passed. In case with TRB140, when all 5 Mobile signal strength LEDs are lit up, they represent
that 10 (LED number multiplied by 2) seconds have passed since you pressed down on the reset
button.
After releasing the button at one of the reset periods, all 5 LEDs will start blinking every 1 second.
This signifies that the router has begun the reset.
