This page contains information the different types of LEDs and their behaviour on a TRB141 device.
The power LED is located on the bottom left corner of the front panel, just under the power connector.
It indicates whether the device is powered on or not.
|LED turned on||Device is powered on.|
|LED turned off||Device is not powered on.|
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.
|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.|
|2G, 3G & 4G LEDs blinking at the same time every 500 ms||No SIM card or incorrect PIN.|
|2G, 3G & 4G LEDs turns 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|