The PTIG Home Page www.project25.org has a direct link to the current list of P25 Steering Committee approved P25 Standards documents The link can be accessed by clicking on the Blue Box on the PTIG home page for “P25 SC Approved list of Standards”.

Project 25 (P25) is a suite of over 80 standards documents for the design and manufacture of interoperable digital Land Mobile Radio (LMR) wireless communications products. The Standards have been developed with state, local and federal government representatives, manufacturers and service providers all under Telecommunications Industry Association (TIA) governance.

P25 has gained worldwide acceptance for government, public safety, public service, military, transportation, utilities, and critical Infrastructure applications.

The published P25 standards suite is administered by the Telecommunications Industry Association (TIA Mobile and Personal Private Radio Standards Committee TR-8). Radio equipment that demonstrates compliance with P25 is able to meet requirements that fit the needs of public safety and government users.

Project 25 manufacturers take the features and specifications defined by the P25 Standards and implement them in reliable software, hosted on rugged hardware platforms that are exhaustively tested to ensure systems are reliant and resilient and that the Project 25 features and capabilities are available even under severe conditions.

Copies of the Standards are free to Government Agencies in the United States. Follow this link for an application form
https://tiaonline.org/wp-ontent/uploads/2020/11/20240730-P25-Request-Form.pdf

For government agencies outside of the United States, please contact Victoria Mitchell at TIA using the link below: [email protected]
Documents for Commercial Entities can be ordered at: https://store.accuristech.com/tia

The www.project25.org homepage has a direct link to a report on the latest P25 Standards update from the most recent TIA TR-8 meetings. The report can be downloaded using the blue box link on the PTIG home page for “Project 25 Standards Latest Update”. The site also has a link to the current list of P25 Steering Committee approved P25 Standards documents under the documents tab.

TSB-102 document is an overview of the P25 suite of standards. That is the place to start and will provide guidance on P25/TIA-102 documents on specific interfaces and services.
Copies of the Standards are free to Government Agencies in the United States. Follow this link for an application form https://tiaonline.org/wp-content/uploads/2020/11/20240730-P25-Request-Form.pdf

For government agencies outside of the United States, please contact Victoria Mitchell at TIA using the link below: [email protected]

Documents for Commercial Entities can be ordered at: https://store.accuristech.com/tia

Yes. The TIA TSB-102 document is an overview of the P25 suite of standards. That is the place to start and will provide guidance on P25/TIA-102 documents on specific interfaces and services.
Consult vendors for their specific offerings.

The Statement of Project 25 (P25) User Needs (SPUN) is derived from the original P25 Statement of Requirements (SoR) document and describes user needs and P25 functionality from the perspective of P25 users. This new SPUN document provides high-level explanations of P25 system architecture, features, and functions as defined in the Telecommunications Industry Association (TIA) 102 Suite of Standards (P25 Standards) and as communicated by P25 public safety users and system administrators.
The SPUN was developed by the Project 25 Steering Committee with support from the Cybersecurity and Infrastructure Security Agency (CISA). The document is currently managed by the P25 Public Safety User Needs Working Group (PSUNWG).
The full document can be downloaded using the link below: https://www.project25.org/images/stories/ptig/Revised_Statement_of_P25_User_Needs_508_Approved_March_2024_1.pdf

This document offers a description of the P25 system model and the organization of P25 Standards documents to give users a baseline of current P25 capabilities and features. The SPUN also provides a framework for users to review, identity, and effectively communicate their needs to those involved in the standards-development process.
That said, not all services, features, and capabilities listed in the user needs tables are addressed by current P25 Standards and/or available on the market. In practice, most P25 systems do not include all the services, features, and capabilities described in the SPUN. This document is intended as a resource for understanding P25 Standards and user needs related to those standards. The lists of user needs should not be considered a complete or binding list of P25 requirements for procurement decisions. Finally, as technologies advance, new user needs likely will emerge and existing needs will be modified or removed.

The P25 Suite of Standards is a library of over 80 documents and standards adopted by the P25 Steering Committee. The TIA-102 series of standards makes up the bulk of the P25 Standard. To date, all documents included in the suite of P25 Standard Documents are created and maintained by the TIA TR-8 Engineering Committee.
Creating a new P25 Standard document typically results from a sequential, but iterative, process between TIA TR-8 and P25 users as described below:
• The NCSWIC/SAFECOM P25 Public Safety User Needs Working Group (PSUNWG) identifies a need for a standard to enable interoperability of some “feature.” This may also be added to the Statement of Project 25 User Needs (SPUN);
• APIC Task Group (combination of manufacturers and NCSWIC/SAFECOM P25 Public Safety User Needs Working Group (PSUNWG) users develops a draft Standard;
• The associated TIA TR-8 Subcommittee including manufacturers and users from NCSWIC/SAFECOM P25 Public Safety User Needs Working Group (PSUNWG) prepare an official TIA-102 standard for publication based on the APIC draft;
• Project 25 Steering Committee adopts the TIA Standard as part of the suite of P25 Standards;
• TIA publishes and maintains the TIA-102 standard.

P25 Phase 1 should be referred to as FDMA (frequency division multiple access) and is available in both conventional and trunked systems while P25 Phase 2 should be referred to as TDMA (time division multiple access), and is only available in P25 trunked systems. P25 Phase 1 may also be known as “full rate” while Phase 2 may be known as “half rate.”
P25 Phase 1 allows for one voice or data transmission per RF channel at one time. P25 Phase 2 allows for two voice or data transmissions per RF channel.
P25 Phase 1 supports a single control channel per RF channel. P25 Phase 2 allows for one control channel that utilizes both TDMA time slots or a control channel and a voice or data transmission per RF channel.

TDMA trunked Data operation or Conventional Voice/Data channel are potential future work items dependent on user input/prioritization.
Project 25 Users should always inquire with P25 system/subscriber manufacturers for availability of any feature/function. 

The P25 Standards are continually updated to address the evolving needs of users, and changing FCC, NTIA, and Global Regulatory requirements. The P25 Standard will continue to evolve with new specifications and clarifications that will resolve interoperability issues, add additional features, offer improved performance, add security upgrades, offer new testing specs, and create additional interfaces.

PTIG members have identified over 3368 (2387 Conventional and 981 Trunked) P25 Systems that are operating world-wide on the air today, and more are in the planning stage The PTIG Home Page https://www.project25.org/ has a direct link to a current list of P25 Trunking Systems and a second list of P25 Conventional Systems. The links can be accessed by clicking on the Blue Boxes on the PTIG home page for “List of P25 Trunking Systems” and “List of P25 Conventional Systems”.