This wiki page contains information about TRB255 gateway LEDs and their actions.
The power LED is located on the bottom left corner of the front panel, near the power connector:
It can perform two different actions:
|LED turned ON||Gateway is powered up|
|LED turned OFF||Gateway is not power up|
Ethernet port LEDs
The Ethernet port LEDs are located on the gateway front panel, in both upper corners on Ethernet port:
Since TRB255 gateway supports Fast ethernet speeds, green LED is not used and only orange LED represents information about ethernet connection activity:
|LED turned ON||Operating as a 10/100 Mbps connection|
|LED turned OFF||No link established|
|LED blinking||Connection established and there is activity (data being transferred)|
|LED blinking fast simultaneously with connection and signal strength LEDs||Router is in the bootloader menu state*|
* The bootloader menu is a special router state from which certain upgrades can be performed. For more information on the bootloader menu, click here
Connection status LED
The connection status LEDs are located on left side of the back panel:
|2G, NB and M1 LEDs are blinking at the same time||No SIM or bad PIN|
|2G, NB and M1 LEDs light up and down in sequence||Searching mobile network operator|
|2G/NB/M1 LED blinking||Gateway connected to 2G/NB/M1, no data session established|
|2G/NB/M1 LED turned ON||Gateway connected to 2G/NB/M1 with data session|
|2G/NB/M1 LED blinking||Gateway connected to 2G/NB/M1 and data is being transferred|
* NB and M1 is Narrowband IoT (NB-IoT) and LTE Cat M1 communications technologies respectively
Signal strength LEDs
The signal strength LEDs are located on the right side of the back panel:
Each lit up LED represents a different value of the gateways current signal strength in RSSi:
|No. of lit up LEDs||Signal strength value|
|0||≤ -111 dBm|
|1||-110 dBm to -82 dBm|
|2||-81 dBm to -52 dBm|
|3||≥ -51 dBm|
The signal strength LEDs can also be used as a time indicator for holding the reset button. When you press and hold the reset button, you have to hold it pressed for 5 seconds (by default) to initiate a factory reset. Depending on a number of signal strength LEDs, time needed to reset router are divided in equal periods, when it passed a new signal strength LED lights up.
In case with TRB255, when all 3 signal strength LEDs are lit up, they represent that 5 seconds have passed since you pressed down on the reset button and you can release it now.
After releasing the button, all 3 LEDs will start blinking every 1 second. This signifies that the router has begun the factory reset.