Narrow-band SCADA networks can use either licensed spectrum (220, 450, 700 or 900 MHz) or unlicensed 900 MHz ISM band. In either case, spectrum is precious and noise floors must be dealt with.
If there is one technique that Cambium has proven time and time again it is that TDD synchronization is highly effective at reducing self-interference -- increasing channel re-use and spectral efficiency.
The cnReach narrow-band platform is no different. It supports TDD synchronization (self-generated or via an external 1PPS source such as the uGPS receiver). Customers have seen benefit of this feature in both 900 MHz ISM band, where cnReach can also use a hop offset technique in cooperation with sync, and in licensed bands.
In licensed bands, combining channel separation, vertical antenna separation, sync and good antenna design enables optimized spectral efficiency and often an increase in achievable modulation and therefore capacity.