The Department of Homeland Security (DHS) is helping, through the Office of Emergency Communications (OEC), to set the broad policy framework for the nationwide public safety broadband network to ensure it meets the needs of its users and aligns with existing emergency communications policy. This guidance document is designed to help educate the public safety community, describe the evolution of emergency communications, and discuss some of the important requirements that must be met to achieve the long-term state of convergence.
http://www.safecomprogram.gov/SiteCollectionDocuments/Public_Safety_Communications_Evolution_Brochure.pdf
