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Public safety communications involves the unique application of a set of principles, a combination of technologies, and integration of processes to provide assured communications support for deployed emergency responders. The following core concepts form the basis of fundamental precepts for planners, providers, and users of public safety communications systems. It should be noted that rapid advances in technology and the engineering disciplines that guide the development of hardware and software to support the public safety communications industry will affect the development and evolution of communications equipments that support emergency responders. As the technologies for the transmission, reception, and processing of information evolve, we caution that, in areas such as standards and specific technologies, the information presented may not always reflect current perspectives of communications systems development. On the other hand, these concepts do reflect the precepts on which sound communications system development and deployment for emergency responders should be based.