03/11/2026
2G and PSTN shutdowns don’t have to mean replacing every RTU in the field.
When an operator retires 2G or a copper line is decommissioned, remote monitoring systems can lose connectivity overnight. A generic LTE modem is rarely a drop-in fix because legacy applications expect the exact AT-command behavior of the original modem.
RAD did exactly that for a critical emergency communications network: More than 1,000 generator sites stayed connected after 2G was retired, with the existing RTUs and monitoring application unchanged.
The key was modem emulation. Each SecFlow-1p IoT gateway presents itself to the RTU as the original 2G modem, then carries the traffic as encrypted IP data over LTE.
Facing a 2G or PSTN shutdown of your own? Our new solution brief explains the approach and walks through the deployment: https://hubs.la/Q04D5RGS0