The DEP450 is a Tier II radio. It can operate in both analog and digital modes.
Specifically, depending on the firmware version of your radio, you will likely need one of two suites: motorola dep450 programming software
The DEP450 is programmed exclusively with Motorola CPS (Customer Programming Software) for the DP4000/DP2000 series . The current compatible software is CPS 2.0 (typically versions 2.0 or higher, depending on radio firmware). Legacy CPS 16 or CPS 1.0 will not work with the DEP450. The DEP450 is a Tier II radio