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Project 25

Project 25 Committees, Programs and Groups

Project 25 Steering Committee (P25 SC)

Following an initial meeting in September 1989, the Project 25 Steering Committee was formed in 1990 in accordance with an agreement between the Association of Public-Safety Communications Officials – International (APCO); the National Association of State Technology Directors (NASTD); and agencies of the Federal Government. This Agreement is known as the APCO/NASTD/FED agreement and provided for the creation of APCO/NASTD/FED Project 25.

In 1992, and amended in 1993, the P25 Steering Committee entered into a Memorandum of Understanding (MOU) with the Telecommunications Industry Association (TIA), whereby APCO/NASTD/FED Project 25 agreed to proceed to select Common System Standards for digital public safety radio communications (the “Standard”) and TIA agreed to provide technical assistance in the development of documentation for the Standard in accordance with TIA’s usual procedures and policies governing standards documentation.

The Project 25 Steering Committee is comprised of four (4) members appointed by APCO, four (4) members appointed by NASTD, five (5) members from various federal agencies that participate in the process, and no more than eight (8) members who represent public safety user organizations that are approved by the Steering Committee. The Committee at its full complement has twenty-one (21) members.

The P25 Steering Committee by-laws are posted on the Project 25 Technology Interest Group (PTIG) website.

Project 25 User Needs Subcommittee (P25 UNS)

The P25 UNS is a permanent sub-committee within Project 25 reporting to the P25 Steering Committee. This subcommittee is responsible for the development and maintenance of the Project 25 Statement of Requirements (P25 SOR) document. This document is a compilation of the features and functionality that have been requested by users to be integrated into standards. The UNS seeks user input for new features and functionality for possible inclusion into the P25 Standard. Not all features and functionality as defined in the Project 25 Statement of Requirements are fully developed into TIA Standards.

The P25 UNS consists of both member organizations and observers that participate in P25 UNS meetings.  P25 UNS meetings may be held face to face, typically during P25/TIA meetings, or by teleconference. Both member organizations and observers participate in P25 UNS meetings on an equal basis, including the submission of documents for consideration at P25 UNS meetings.  The only difference in membership status is that formally voting on P25 UNS matters is restricted to voting-eligible member organizations.

A P25 UNS member organization is defined as a local, county, regional, tribal, state, federal entity or associations interested in Project 25.

A P25 UNS observer is defined as a participant that does not represent an entity as described above.  Observers may include but are not limited to:

  • Representatives of P25 hardware or software companies
  • Individuals that have an interest in the sales and distribution of P25 Equipment
  • P25 test laboratories

APCO Project 25 Interface Committee (APIC)

Project 25 required an interfacing function between the Project 25 Steering Committee and the TIA-TR8 Mobile and Personal Private Radio Standards Committee of TIA. The APCO Project 25 Interface Committee (APIC) was created to fulfill this need. APIC is an ad hoc committee of the Private Radio Section (PRS) in the Wireless Communication Division (WCD) of the TIA.

The APIC committee and taskgroup membership is voluntary, free and open to any industry member organization, public safety user or interested parties willing to participate. Membership is composed of one voting representative from every organization participating in the process. Users are requested to accurately define their needs and requirements. Industry identifies and presents technologies as possible solutions to the user’s requirements.

The APIC taskgroups are not standard formulating groups. The APIC taskgroups do develop documents that are reviewed by users and industry representatives, decisions based on consensus. The APIC document may look like a document from a standard formulating groups, but APIC documents are not standards formulating documents. This ‘look-alike’ document development is a strategy so that when the draft document is moved to TIA for formulation into a standard, re-writes to the document are minimized. This interaction between user and industry provides for an iterative process as the proposed feature is detailed with written messages, procedures and diagrams. Once the taskgroup has completed their work, the work product is provided to the corresponding TIA engineering sub-committee for formulation into a standard according to ANSI approved processes.

TIA-TR8 Engineering Committees

Engineering Committee TR-8 formulates and maintains standards for private radio communications systems and equipment for both voice and data applications. The TR-8 Committee addresses all technical matters for systems and services, including definitions, interoperability, compatibility and compliance requirements.

Much of the TR-8 Committee work relates to the formulation of TIA-102 Series standards for Project 25. Project 25 standards are developed to provide digital voice and data communications systems for public safety applications. The TR-8 committee is also responsible for the formulation of TIA-603 Series standards for analog FM systems, standards for portable radios operating in hazardous locations, TSB-88 wireless coverage guidelines for LMR and broadband systems and TIA-329 standards for communications antennas.

The TIA-TR8 engineering committee has 14 sub-committees; each focusing on a specific aspect of radio communications.


Subcommittee Focus

TR-8.1 Equipment Measurement Procedures
TR-8.3 Encryption
TR-8.4 Vocoders
TR-8.5 Signaling and Data Transmission
TR-8.8 Broadband Data Systems
TR-8.10 Trunking and Conventional Control
TR-8.11 Antenna Systems
TR-8.12 Two Slot TDMA
TR-8.15 Common Air Interface
TR-8.17 RF Exposure
TR-8.18 Wireless Systems Compatibility - Interference and Coverage
TR-8.19 Wireline System Interfaces
TR-8.21 Land Mobile Radio (LMR) Intrinsic Safety (IS) Consideration
TR-8.25 Compliance Assessment

TIA-TR8 offers a unique service for public safety users and their agencies. A public safety user can request a copy of any TIA-102 Standard free of charge. A TIA web page, P25 Downloads for Government Entities, describes how to request the TIA-102 Standard that might be of interest. There are many published TIA-102 Standard documents. A good introductory document is the “TSB-102-C Project 25 TIA-102 Documentation Suite Overview”. This document provides a detailed overview (over 100 pages) of the P25/TIA-102 Standards with feature descriptions. This document also provides the titles and a short summary of all the TIA-102 Standard documents.

Project 25 Compliance Assessment Program (P25 CAP)

Project 25 (P25) develops standards for interoperable land mobile radio (LMR) systems so emergency responders can exchange critical communications across agencies and jurisdictions. P25 standardizes interfaces between the various components of the LMR systems emergency responders’ use.

Congress legislated the P25 Compliance Assessment Program (P25 CAP) to ensure LMR equipment complies with P25 standards for interoperability across suppliers. The P25 CAP is a partnership of the U.S. Department of Homeland Security’s Office for Interoperability and Compatibility, P25 manufacturers, and public safety users of P25 technology.

The P25 CAP is a voluntary testing program for P25 manufacturers. The program started with a focus on the Common Air Interface, which allows for over-the-air compatibility between radios and base/repeater equipment. The program will be adding 2-slot TDMA and supplementary data testing of the Common Air Interface as well as testing of the Inter Sub-System Interface (ISSI) and Console Sub-System Interface (CSSI).

P25 CAP develops Compliance Assessment Bulletins (CAB) that outline specific test cases for P25 equipment. These test cases are taken from published TIA-102 Standards. P25 CAP testing must be performed by an accredited test lab that has been assessed for P25 equipment testing. The P25 equipment manufacturers submit the test case results to DHS OIC for review and posting on the DHS P25 CAP website as Approved (Grant Eligible) Equipment.

Many federal grant programs strongly encourage the purchase of P25 CAP compliant equipment. Details about grants can be found in the SAFECOM Grant Guidance document that is published each year. References to P25 CAP equipment can be found throughout the grant guidance document.

Project 25 Technology Interest Group (PTIG)

TheProject 25 Technology Interest Group (PTIG) is a group of individuals and organizations who share the mutual interest of advancing the refinement, development, deployment, and applications of the digital communications technology represented by Project 25 industry standards.

PTIG members include two-way radio communications experts, public safety professionals, and equipment manufacturers.   PTIG members recognize the need for, and have a direct stake in, the continued development of the critical communications capabilities represented in the P25 standards.

This website has many technical resources and documents. Key P25 documents such as the Project 25 Statement of Requirements, the P25 Steering Committee by-laws,  the P25 Supplier Matrix and the ‘Capabilities Guide’ can be found at PTIG website.

The ‘Capabilities Guide’ maps the feature descriptions found in the P25 SOR to the TIA-102 Standards that define P25 standardized messages and procedures that support those features. The Capabilities Guide can be useful to gain a better understanding of which P25 features found in the P25 SOR are standardized in TIA-102 Standards documents. The Capabilities Guide covers all of the P25 system interfaces; e.g., the Common Air Interface (CAI), the Inter Sub-System Interface (ISSI), etc.

PTIG is an independent, non-profit organization dedicated to the advancement of the P25 Suite of Standards and associated products and services.