Emerging Technologies and System Modernization
What this domain tests
Domain 9 examines how agencies modernise: P25 evolution, broadband and FirstNet, mission-critical services, IP and cloud backhaul, and the lifecycle discipline of testing and cutover.
Core rules
- Moving from P25 Phase 1 (FDMA, 12.5 kHz) to Phase 2 (two-slot TDMA, 6.25 kHz equivalent) is a capacity play. Migrations often run both modes during transition.
- Broadband: FirstNet uses 700 MHz Band 14 with priority and preemption, a dedicated core and 3GPP mission-critical services. MCPTT, MCData and MCVideo are the MCX standards for push-to-talk, data and video over LTE and 5G.
- Broadband complements LMR for data, video and off-network coverage; it does not replace P25 mission-critical voice where coverage and direct mode are required.
- Interworking: ISSI links P25 systems; gateways and cross-band subscribers bridge LMR with broadband or legacy analog; RoIP carries console audio over IP.
- Modernisation touches backhaul (TDM microwave to IP/MPLS, Ethernet, SD-WAN), the core (virtualised or cloud-hosted) and dispatch (NG911, ESInet, i3, GIS-driven location).
- Lifecycle: requirements, RFI/RFP, factory and site acceptance testing, coverage acceptance, parallel operation, cutover and legacy sunset, with grant funding and cybersecurity review built in.
Worked example
An agency replacing a 20-year-old analog VHF system writes requirements around talk-in and talk-out DAQ coverage, busy-hour capacity, encryption and interoperability with two neighbouring systems. The chosen P25 Phase 2 trunked system is accepted only after grid testing meets 95% at DAQ 3.4 and a 30-day parallel run shows no coverage regression. The old VHF channels stay for a year as a fallback under a written sunset plan.
Traps
Assuming FirstNet replaces LMR for mission-critical voice, conflating MCPTT with P25, ignoring backhaul and site power as modernisation costs, and cutting over without a parallel run or documented fallback.