This radio system operates as a Transit Trunked Radio System.
A "Transit-Trunked" system utilizes conventional equipment with a trunked "overlay" system for channel assignment. Only mobile radios are equipped with a transit-trunked capability, and can communicate only if dispatch enables them. Portables operate on the same channels but conventionally. One or more low-speed data channels (DATA 1 & 2) are used for polling, short messaging, radio enabling and channel assignment.