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24 <br /> • Estimated costs <br /> • Migration plans <br /> Existing Radio Systems <br /> • VIPER (Voice Interoperability Plan for Emergency Responders) — 700/800 MHz P25 — <br /> all public safety users <br /> o No local system administration <br /> o Single points of failure / lack of redundancy <br /> o Expansion possible — current model: purchase equipment and give to State <br /> • UHF — backup system for Chapel Hill <br /> • VHF —fire paging, schools, animal services, backup for multiple public safety agencies <br /> Alternatives Considered <br /> • VIPER 700/800 MHz P25 channel expansion <br /> • Standalone 700/800 MHz P25 <br /> • Shared 700/800 MHz P25 system (Durham County) <br /> • Standalone VHF Analog <br /> Standalone alternatives consist of building blocks that can be combined between alternatives <br /> VIPER Channel Expansion <br /> • Add channels to existing VIPER sites <br /> • Improves capacity—fewer busies/blocked calls <br /> • Lowest cost of alternatives <br /> • Does not address <br /> o Required radio coverage improvements <br /> o Required system availability/redundancy improvements/single points of failure <br /> o Required local system administration improvements <br /> o System use by public services (schools, public works, transit, animal services, <br /> OWASA, solid waste) <br /> Standalone 700/800 MHz P25 <br /> • Dedicated 700/800 MHz P25 system for County, serving all users (now and in future) <br /> • New system control equipment (redundant) <br /> • New radio site equipment (sites, towers, shelters, radio channel equipment, microwave) <br /> • New consoles (or use existing), control stations (to access "other" systems) <br /> • Retention of most existing portable/mobile radios <br /> • Provides improved: <br /> o Outdoor and indoor radio coverage <br /> o Capacity for all users, expandable <br /> o Local system administration <br /> o System availability/reliability (redundancy— no single point of failure) <br /> • Sites built for 700/800 MHz P25 leveraged for use by VHF system, County broadband <br /> • Dedicated microwave for radio systems, leveraged for use for County data, County <br /> broadband <br /> Shared System — 700/800 MHz P25 <br /> • Same as standalone 700/800 MHz P25 system EXCEPT <br />