Radio Frequency Subsystem

The RF infrastructure that is bounded by the five open APCO Project 25 interfaces and three standard computer network gateway interfaces. It is the RF equipment and related nonstandard peripheral equipment that provides a standardized RF communication channel. One of the APCO Project 25 interfaces is the Common Air Interface (CAI). For Motorola Solutions systems, the RF-Subsystem, or RFSS, equates to a “zone”.