Using 3G/4G routers allow field connectivity to a cellular network. This allows for control data to be accessed from very remote applications where Wi-Fi may not be available.
This application involves a special helmet provided with an audio set and a webcam.
Maintenance people wear the helmet and have an intrinsically safe tablet and both are connected to internet through the Solexy cellular router/Wi-Fi hot spot.
This allows communications from a remote control room to assist their maintenance people in the field.