The SCPD mobile data system uses Motorola's RD-LAP at 19.2 kbps. It operates over conventional channels in the 482-488 band. While the radio signals for RD-LAP are generally not encrypted (DES, DES-XL, etc.) there are no known decoders for the RD-LAP protocol outside of a Motorola radio modem. The 800 trunked system is not used to support mobile data terminals.
On analog Motorola systems, whether conventional or trunked, mobile data terminals can be supported, but the channel must be exclusive for data. On their digital systems, whether conventional or trunked, voice and data can share the same channel.
The microwave antenna at each precinct is used to provide regular network connectivity (desktop computers, telephones, etc.); the other radio antenna is for a desktop radio in the station house.