Project 25 Technology Information Group

Monday, December 10, 2018

Project 25 Technology Information Group

PTIG presented a Panel on Project 25 Basics for the Non Technologist at the recent APCO Show

Project 25 has evolved as the dominant Standard for Public Safety communications systems in North America. Many PSAPs are now operating P25 Systems. FCC narrowband requirements have caused many older systems to be recently upgraded to P25 to meet FCC narrowband requirements. Also many existing P25 Phase 1 networks are in the process of migration to more spectrum efficient P25 Phase 2. Through all this, P25 remains a complex and mysterious entity for the majority of dispatchers, radio system administrators and other practitioners. At best it seems clouded in technical engineering jargon with few direct links from the technical workings of the systems and products to benefits for the users of the equipment.

This session covered the basics of the standard and details the various over the air interfaces and network interfaces and how they enable interoperability between: multiple users, agencies, jurisdictions and regions. It also explained the potential barriers to interoperability.


Neil Horden: Chief Consultant, Federal Engineering:


The basics of the standard and details about the various over the air interfaces and network interfaces and how they enable interoperability between: multiple users, agencies, jurisdictions and regions. Potential barriers to interoperability.  Detailed explanations of unit to unit interoperability using the Common Air Interface as well as network links using the Console Interface, Inter-System interface and Fixed station interface. Explanation of the evolution of P25 from Phase 1 systems to Phase 2 systems.


Jim Downes: DHS Office of Emergency Communications


A variety of Frequently Asked questions were asked and answered in laymen’s terms about P25. Some examples: What is P25? How does it facilitate interoperability? What is P25 Phase1? Phase2? Does the future First-Net LTE broadband data network make P25 obsolete? How to get Multi Vendor radios approved on a P25 system. P25 ISSI and CSSI and Interoperability, P25 Encryption, When will the P25 Standard be complete?


Jim Junkins: Director, Harrisonville/Rockingham Emergency Communications


1) Phase 1/Phase 2 mixed mode fleet mapping, 2) User radio programming concepts/overview...dealing with the complexities and intricacies of programming multiple P25 systems, with legacy, non-public safety systems as well as multi-band radios, etc.  


Steve Nichols: PTIG


A variety of resource materials and tools such as the P25 FAQ resource, P25 capabilities Guide, NPSTC PAM tool, and Project 25 Standards update were identified and access links shared.

Full PPT for the P25 Session Download



PTIG panel at the recent APCO Show in Washington DC

Now you can have the Console of Choice for your P25 Radio Systemu

In the past, call center console choices were limited to one or possibly two options. One offered by the radio system manufacturer and the other from an alternative supplier that often did not have control for all of the features and capabilities that the system offered. Today that is no longer the case. The Project 25 Suite of Standards has been updated to include a console interface the CSSI that allows Project 25 LMR trunking systems to interoperate with a variety of consoles from multiple P25 equipment manufacturers. This session offered case studies of Lancaster County PA, The State of Oregon, and a Federal Agency who have successfully integrated consoles and systems from different manufacturers. In many cases the ability to use an existing console saved significant costs in re-training and allowed a fast efficient migration to a new radio system run by software intimately familiar to the dispatchers.

The session covered a case studies on how the P25 Console Interface (CSSI) was used to interface a console and radio system from different manufacturers. The planning, scope, issues, and lessons learned by the radio system manager and dispatch supervisor were presented. The cost efficiencies and other benefits were addressed. Examples of a Federal Agency using the CSSI and ISSI for interoperability was also presented. A basic technical description of the CSSI was presented and offered as a resource document.

The presenters on the panel are listed below:

Randy Richmond, Standards and Regulatory Specialist, (Zetron)

Tim Baldwin, Deputy Director, (Lancaster County)

Larry Hicks, VP Engineering, (Pantel)

Ron Postma, Console Implementation Manager, (Oregon DoT)

Robin Grier, President, (Catalyst)

A Link to the Full PPT for the Console of Choice Session is below

P25 Console of Choice using the P25 CSSI

The Project 25 Technology Interest Group has selected Lexington Kentucky as the new Project 25 System of the Month.


Project 25 Technology Interest Group


P25 System of the Month


Lexington KY




Lexington, Kentucky Turns to P25 for Interoperability

For the first time in Lexington’s history, its public safety personnel—police, fire and corrections—can communicate seamlessly and effectively over the same radio system thanks to Airbus DS Communications’ VESTA™ Radio P25 land mobile radio solution.


The project started in the summer of 2012 and cutover in the spring of 2014, replacing the 40-year-old VHF analog system and bringing much needed interoperability to the city’s public safety departments. Prior to installing its current solution, interoperability was out of the question. In fact, the only means for “interoperability” between departments was to place multiple radios in each police car and firetruck, forcing first responders to communicate through each department’s separate radio system.


Lexington’s new LMR system includes approximately 1,500 radios between Police, Fire, and Corrections users. The radios were tested in open fields, heavily wooded areas, city buildings, country farms, and even in the middle of rivers—all with strong, clear communication. The new network and equipment provide greater coverage and reliability over the legacy analog system, and exceeded coverage requirements of the initial plan.

“Having everyone on the same system and the ability to communicate at the touch of a button is a major leap for public safety,” said Robert Stack, Director of Enhanced 9-1-1 in Lexington. “Importantly, we were able to tailor the system to our needs.”

Collaboration and Open Procurement

With Lexington’s new P25 system, police, fire and corrections personnel—as well as the Blue Grass Airport—can effortlessly communicate across departments to collaborate. Even more, the open standards infrastructure provided Lexington the flexibility of open procurement. Open procurement meant that each agency could select the radio brand and model that worked best for them, instead of being limited to a single vendor. Ultimately through this process, Lexington built a seamless Project 25 system—and at the right price for each agency involved.

Thanks to VESTA Radio, Lexington is now a city unified under P25 LMR.

Link to a copy of the Lexington KY P25 System of the Month PDF file here


To find out how your P25 System can be nominated as a P25 System of the Month


Stephen Nichols

Director Project 25 Technology Interest Group

This email address is being protected from spambots. You need JavaScript enabled to view it.

Mission Critical Magazine recently published a new article on the P25 ISSI and CSSI

The Importance of P25 Wireline Interfaces ISSI and CSSI

Mike Schools, Catalyst CommunicationsTechnologies’ Vice President of Engineering

Below is an excerpt from the Mission Critical Magazine article:


"Open standards offer benefits that are difficult to overstate: freedom of choice for customers; lower overall cost of development, which is ultimately paid for by customers; vendor confidence that development can be re-used and refined; and freedom for both customers and vendors to focus on real issues including innovations that reduce costs and enhance productivity.  The results of our process check indicate that P25 standards are off to a great start, but require more investment, further refinement and full adoption.  These potential benefits materialize only if the standard is adopted extensively, not only by manufacturers but also by customers and the consultants who advise them. In the consumer world you can see many examples of standards that thrived because customers invested in products that used them. VHS succeeded over Betamax not because it was a superior technology, but because customers bought and invested in it first. Blu-ray won out over HD-DVD for more complex reasons, but ultimately customers only embraced Blu-ray. Cutting-edge technologies in their day, eventually both became reliable and inexpensive. But customer buy-in and acceptance was critical to continued investment and additional refinements by industry. No matter what the technical potential of a solution, adoption and economics drive its development and maturation.  Every technical person in every industry I’ve ever worked in believes at some level that their industry or organization has special requirements that just aren’t like anyone else’s and that they need a custom, special purpose solution. Technology is expensive to build, maintain and support.  Simply put, accommodating proprietary interfaces is more expensive than using one standard interface. Adoption enables our industry to expand its available offerings by leveraging the combined efforts of every vendor in the industry. That would mean that the wireline P25 standards — CSSI, ISSI and the Fixed Station Interface (FSI) — should be the only interfaces used for core P25 wireline communications, regardless of what vendor supplies the individual pieces of the subsystem, though manufacturers could continue to differentiate using proprietary extensions to the standards".



The full article can be found on the Mission Critical Magazine  link below.

The Project 25 Technology Interest Group (PTIG) held it’s Annual Meeting in conjunction with the APCO International Conference in Washington on August 16th. At that meeting, a Board of Directors and Officers were elected. A number of New Board members were elected from the Public Safety Radio User Community to fill vacancies created as previous members moved on. These include:

  • George Crouch who is the Public Safety Communications and Emergency Operations Administrator for the South Carolina Department of Administration, Division of Technology Operations. Mr. Crouch’s duties include administration of South Carolina’s Statewide 800 MHz Public Safety Radio System (Palmetto 800), communications interoperability planning, state coordinator for ESF-2 (Communications), and contract manager for the state’s communications. Mr. Crouch is the Co-Chair of the Project 25 Steering Committee
  • Cindy Cast who serves as the Radio Systems Manager in the Information Technology Service Department, Radio Communication Services Division of Miami-Dade County, . She is responsible for activities associated with the management, maintenance, repair, and uninterrupted operation of the telecommunication radio systems, including the 800 MHz/700 MHz P25 trunked simulcast radio systems. The systems serve over 30,000 radio users.
  • John Richards who is the Director of Radio Services for the State of Maine. He has been in that role since December of 2012. He manages Maine’s new P25 Public Safety Radio system. Previously he was Operations Manager for Yankee Communications in Benton Maine, a position he held for over 18 years.
  • Eric Linsley who is employed by Mobile County, Alabama, Commission as the Director of Public Safety Communications. Eric is the Department Head in charge of all Mobile County Commission Electronic Systems. Eric is Chairman of the Region 1, Alabama 700 MHz & 800 MHz Planning Committee and local frequency advisor for Alabama.
  • Tom Bowen who is the P25 Radio Network Administrator for Floyd County Government in Rome, Georgia. He is the Radio System Administrator for 2000 users on an APCO P25 based Simulcast network with 10 tower sites. It is a Public Safety network with the addition of public works and private agencies. Mr. Bowen also assists with Emergency Management rescue, CERT and amateur radio volunteers.

Other Radio Users returning to the PTIG Board include: Del Smith- Alaska ALMR, Brad Stoddard-State of Michigan; Brandon Diemer-BLM NIFC, Eric Davies- DHS; Karl Larson-City of Portland; Dean Hane MACC-911; and Jim Junkins-Harrisonburg/Rockingham VA.

The PTIG Board also includes returning Commercial Members including: Andy Davis-Motorola Solutions and TIA TR-8 Chair; Chris Lougee ICOM America and TIA PRS Chair, Jim Holthaus RELM and Chair TIA TR8.25 Compliance Assessment; James Reid-Harris; Cheryl Giggetts-AECOM; Neil Horden-Federal Engineering; Roy McClellan- Airbus DSC; Doug Chapman-Etherstack; Robin Grier-Catalyst; Sanjay Patel-IDA.

The PTIG Slate of Officers was also nominated and elected at the Annual Meeting. Chairman: Del Smith, Vice Chairman: Jim Holthaus, Treasurer: Chris Lougee, Secretary: Andy Davis. Stephen Nichols was appointed to continue as Executive Director for the non-profit organization.





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