Template:Networking trb255 manual connection status leds
Connection status LED
The connection status LEDs are located on left side of the back panel:
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| Action | Description |
|---|---|
| 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 is Narrowband IoT (NB-IoT) and M1 - LTE Cat M1 communications technologies