skip navigation

Justinfo Subscribe to Stay Informed

Add your conference to our Justice Events calendar


NCJRS Abstract


Subscribe to Stay Informed
Want to be in the know? JUSTINFO is a biweekly e-newsletter containing information about new publications, events, training, funding opportunities, and Web-based resources available from the NCJRS Federal sponsors. Sign up to get JUSTINFO in your inbox.

The document referenced below is part of the NCJRS Library collection.
To conduct further searches of the collection, visit the NCJRS Abstracts Database.

How to Obtain Documents
NCJ Number: NCJ 224940     Find in a Library
Title: Issue Brief 6 - Project 25: The Quest for Interoperable Radios
  Document URL: Text PDF 
  Agency Summary: Agency Summary 
Author(s): Dan Hawkins
Corporate Author: SEARCH - National Consortium for Justice Information and Statistics
United States of America
Date Published: 05/2007
Page Count: 8
  Annotation: This report reviews the history, products, effects, and future of Project 25 (P25), which began in 1989 as a joint effort of the Association of Public-Safety Communication Officials-International, Inc. (APCO) and the National Association of State Telecommunications Directors (NASTD) to ensure a future with an open, standards-based alternative for digital radio systems.
Abstract: P25 received its name under APCO’s tradition of numbering its broad initiatives that affect the public safety communication world. “P25” has become synonymous with “public safety digital radio standards.” Three key aspects of P25 make it important for improved communication interoperability, i.e., the capacity of different public-safety agencies to have radio communication with one another. First, the P25 standards initiative was begun and driven by public safety agencies and organizations. Second, P25 proceeded with both a vision of forthcoming technological change and the need for the smooth migration between technologies used by public safety agencies. Third, competition based on open standards would produce the best technology at the best prices for public safety agencies. P25 defined a general system model for public safety radio communications with eight open interfaces. These interfaces connected components (subsystems) of radio systems that were becoming increasingly complex year after year. This paper describes these interfaces. P25’s value for interoperability is twofold. First, it harnesses the naturally disruptive trend of technological change; and second, it requires backward compatibility, i.e., radios built to P25 standards would be technically capable of communicating with earlier analog radios, including within trunked systems. This paper discusses when P25 is required, its value to an individual agency, and its disadvantages (cost, conventional use and interference, and complexity that breeds incompatibilities). The current status and future of P25 are also discussed. 1 figure
Main Term(s): Police emergency procedures
Index Term(s): Digital communications ; Emergency communications ; Interagency cooperation ; Voice communications ; Mobile digital communications
Sponsoring Agency: Office of Community Oriented Policing Services (COPS)
US Dept of Justice
United States of America
Grant Number: 2004-IN-WX-K002
Sale Source: Office of Community Oriented Policing Services (COPS)
US Dept of Justice
Two Constitutional Square
145 N Street, N.E.
Washington, DC 20530
United States of America
Type: Report (Technical) ; Historical Overview
Country: United States of America
Language: English
Note: Issue Brief of the COPS Interoperable Communications Technology Program, N 6, May 2007; downloaded November 26, 2008.
  To cite this abstract, use the following link:

* A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's web site is provided.