Project 25 Resources


Project 25 (P25) land mobile radio (LMR) systems provide critical tactical and emergency communications capabilities to public safety agencies nationwide. The P25 Standards that define the technical foundation on which these interoperable systems rely are “built for public safety by public safety” and their development relies on collaboration between user and manufacturer communities. P25 is a set of standards that manufacturers can follow to ensure that their LMR equipment can interoperate (communicate) with equipment produced by other manufacturers. As a result, emergency responders and others who rely on LMR equipment and systems for critical communications can be assured that equipment from various manufacturers can be configured to work together.

Basics of Project 25 Video
Drawn from interviews with dozens of emergency communications practitioners nationwide, “Basics of P25” presents an overview of interoperability and P25. The video outlines P25’s role in public safety, its value in both daily operations and emergencies involving mutual aid partners and outside agencies, and its advantages for enhancing personnel safety and operational efficiency. It also discusses potential cost savings for communities and presents practical recommendations for planning and implementing a P25 radio system. It is an ideal brief overview of P25 aimed at community leaders and public safety administrators, officials, and responders.

Public Safety Interoperability Implications of non-P25 Radio Technologies
This product discusses some of the available non-Project 25 (P25) radio technologies that some public safety organizations might consider to support their operations. It examines the possible benefits of these technologies, as well as the potential implications they might impose on interoperability within the public safety communications community.

Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Primer
The Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) provides the ability to interconnect Project 25 radio frequency subsystems and console subsystems, even when systems are supported by different manufacturers. Given the inherent complexities in interconnecting radio frequency subsystems and navigating the implementation of standards-based technology, FPIC ISSI/CSSI Focus Group developed the Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Primer. The Primer provides a high-level overview and serves as a resource for current and prospective ISSI/CSSI users as they plan and implement these interoperability solutions.

Best Practices for Planning and Implementation of P25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI): Volume I
As the public safety community continues to recognize the importance of land mobile radio (LMR) operability and interoperability, interest in ISSI and CSSI technology has increased. In response to this heightened interest in both technologies, FPIC, in conjunction with SAFECOM and NCSWIC, developed the Best Practices for Planning and Implementation of P25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI): Volume I document to help the ISSI/CSSI user community address pre-planning, partnerships, and governance practices essential to planning an ISSI and/or CSSI implementation. The document includes a high-level overview of ISSI/CSSI technologies and a “Best Practices Checklist” to help explain the benefits of interoperability enhancements and the potential for infrastructure sharing for current and prospective ISSI/CSSI users as they plan and implement these interoperability solutions.

Best Practices for Planning and Implementation of P25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI): Volume II
The Best Practices for Planning and Implementation of Project 25 (P25) Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI): Volume II addresses technology, policy and partnerships for planning and implementing an ISSI or CSSI. The volume includes a best practices checklist intended to prompt practitioners to ask questions and consider strategic elements that may otherwise be overlooked during planning or implementation.

Statement of Project 25 User Needs
Developed by the P25 Steering Committee with support from CISA, this document Statement of Project 25 User Needs (SPUN) provides an overview of P25 systems and user needs for various P25 components and interfaces. Intended for public safety users and officials wanting to know more about P25 and P25 Standards development, the SPUN is an excellent resource for novice and veteran P25 users.

The Funding and the Future of P25 Video
“The Funding and the Future of P25” is an overview of the value and advantages of Project 25 (P25) as a long-term investment in a community’s public safety. Presented through interviews of emergency communications practitioners and managers nationwide, the six-minute video focuses on the features and comparative costs of P25 standards-based systems versus non-P25 systems, the practical value of P25 technology in public safety operations, and recommendations for funding P25. Looking ahead, the presenters discuss the current states of P25 and long-term evolution (LTE) broadband technology, emphasizing the durability, transmitting power, one-to-many communication, and emergency push-to-talk features of P25 radios. Their conclusion: P25 and LTE are not exclusive options but likely complimentary components of public safety communications in the future.

Emergency Alarm: Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Features and Functions White Paper
The Emergency Alarm: Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Features and Functions white paper provides communications system planners, administrators, and technicians with instructive and actionable information about emergency alarms and emergency calls across ISSI and CSSI connections. The document provides technical explanations on how these features work, challenges public safety has witnessed, and implementation considerations for multi-system environments.

Project 25 Steering Committee Representative Handbook
The Project 25 (P25) Steering Committee Representative Handbook outlines the history, background, goals, and procedures of the P25 Steering Committee. Specifically, the document provides information on Steering Committee membership, voting, and P25 Standards development, and provides helpful recourses for new members or anyone interested in learning more about P25 Standards and the standards development process.

The Patching and Dynamic Regrouping: Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Features and Functions White Paper
The Patching and Dynamic Regrouping: Project 25 Inter-RF Subsystem Interface (ISSI) and Console Subsystem Interface (CSSI) Features and Functions white paper provides communications system planners, administrators, and technicians with instructive and actionable information about patching and regrouping across ISSI and CSSI connections. The document provides technical explanations on how these features work, challenges public safety users have witnessed, and implementation considerations for multi-system environments.

Land Mobile Radio (LMR)/ Long Term Evolution (LTE) Integration: Best Practices Whitepaper
The document provides emergency communications stakeholders with case studies and best practices from early LMR/LTE integration efforts at the state and local levels. Gathered through interviews with public safety practitioners who are pioneering LMR/LTE integration, the information aims at demonstrating the potential of these efforts and presents some of the lessons learned along the way.

Joint SAFECOM-NCSWIC P25 UNWG Fact Sheet
The document was created to provide an overview of the P25 UNWG’s history, structure, and recent products to support education and recruiting efforts across the public safety community to increase subject matter expert membership and involvement in SAFECOM, NCSWIC, and the P25 UNWG.

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