From the Introduction: "In a climate of heightened competition for public safety funding, leaders make difficult budgeting decisions while addressing a variety of state, local, tribal, and territorial needs beyond emergency communications. Agencies must be fully prepared to provide decision-makers with an explanation of mission critical communications costs and benefits to the community. The Cybersecurity and Infrastructure Security Agency (CISA) developed the 'Emergency Communications Systems Value Analysis Guide' to assist public safety agencies evaluate communications systems and equipment for cost effectiveness and value to its users. This document describes common systems and equipment, including considerations and features required by public safety agencies and emergency responders. It is intended to inform planning and cost estimation through the entire system lifecycle--beginning with initial capital investments, through ongoing maintenance and operations, replacement parts, and finally disposition and transition to new capabilities once a system has reached its useful end-of-life."
U.S Department of Homeland Security Cybersecurity and Infrastructure Security Agency: https://www.cisa.gov/