A. 911 System All upgrades to the new i3 PSAP CHFE are expected to be completed by December 31, 2024. The current King County Regional CHFE system consists of eleven (11) PSAPs and one (1) test/lab PSAPs totaling two hundred-thirty (230) seats and thirty (30) “floating laptops.” Each PSAP has survivable Intrado VIPER/Power911 CHFE equipment that connects directly to three (3) geographically diverse data centers. The current regional CHFE equipment interfaces to other equipment in the PSAPs, such as CAD. In the Single System Architecture model, the core elements of the 911 telephone system infrastructure reside in a multi-node host platform. The State’s ESInet II delivers calls to the County’s shared system platform, and the PSAPs are networked to that platform via the County ESInet. The current version of the 911 System is Intrado Viper 7. To increase system resiliency, one of the host nodes is geographically located outside King County. B. PSERN The PSERN implementation project was completed in 2023. PSERN is an 800MHz simulcast trunked radio system utilizing P25 Phase II digital technology. The system consists of more than sixty (60) radio transmission sites across King County and supports over eighteen thousand (18,000) portable (hand-held), mobile (vehicle), and control station (desktop) radios, as well as dispatch center consoles within the service area. The current version of the radio system is Motorola ASTRO P25 radio network release A2021 or later. The radio system consists of: 1. Geographically redundant master sites and forty-seven (47) radio frequency (RF) sites that provide both simulcast and multicast coverage 2. One hundred forty-three (143) MCC 7500 dispatch operator positions spread across twenty-one (21) locations within the County 3. APX mobile and portable subscriber radios 4. Three (3) conventional Mutual Aid subsystems. The Mutual Aid subsystems are consolidated and primarily managed by the P25 master site equipment. They include a simulcast VHF subsystem (three (3) channels), a simulcast UHF subsystem (one (1) channel), and a simulcast 800 MHz subsystem (8CALL), as well as local 7TAC and 8TAC repeaters.
