Project 25 Technology Information Group

Tuesday, December 12, 2017

Project 25 Technology Information Group

The Project 25 Technology Interest Group publishes a new White Paper on Automatic Roaming in a P25 Radio System. 


The paper was authored by Andy Davis: Chairman TIA TR-8, Senior Resource Manager - Motorola Solutions and Bill Janky:Director System Design - Harris Corporation.   


The term Automatic Roaming is sometimes misunderstood. There are two methods of roaming that are often discussed in P25 and informally referred to as “automatic” and “manual’. Both roaming methods have unique aspects that mainly affect two areas – user experience, and identity management.

From the perspective of the user, “automatic roaming” refers to the radio’s ability to move from the coverage of one RF site to another without user intervention (or often even user knowledge) and the ability of a radio to move from the operational area of one system to the operational area of another system without changing the operating identities (individual and/or group) of the radio.

The User Experience and Identity Management aspects of roaming are described in detail in the full article that can be accessed via the link below:


Automatic Roaming in a P25 Radio System




The Project 25 Technology Interest Group has released an Update on the Project 25 Suite of Standards.  The update is based on activity at the TIA TR-8 Standards Meetings held October 2015 In Austin TX.  The report was prepared by Andy Davis Chairman of the TIA TR-8 Committee.  The next TIA TR-8 P25 Standards Meetings will be held January 26-28, 2016 in San Diego CA.


A link to the report is found below:

P25 Standards Update October 2015

Project 25 Technology Interest Group Releases New P25 System List Including Australia, Canada and UK P25 Systems

The Project 25 Technology Interest Group (PTIG) has released an updated version of their Project 25 Systems list covering all of the known P25 Systems in the USA, US Territories, Australia, Canada, and the UK. The format of the list has been improved to include both P25 Phase 1 and P25 Phase 2 systems on the same list. Now all P25 systems for a state or country can be viewed on a single document.

This new list identifies 592 P25 Phase 1 and 119 P25 Phase 2 systems in the USA for a total of 711 P25 systems in the USA. The new entry for Australia, Canada and the UK includes 36 P25 Phase 1 systems and 8 P25 Phase 2 systems for a total of 42 P25 Systems.  Since the last release, a number of P25 Phase 1 systems have upgraded to P25 Phase 2. In total, 17% of the P25 systems are currently Phase 2. In the USA, the state with the most P25 systems is Texas with 70 systems. Next is California with 51, Florida with 50, Georgia with 42 and rounding out the top 5, is Pennsylvania with 29 P25 systems.

A new column has been added to include the primary user group for the system (Public Safety, DoD, Federal Agency, Federal Prisons, Airport, Hospital, University, Refinery, etc.) The far and away leading P25 system type is Public Safety with 430 systems. Next is DOD with 127 known systems and Federal Agencies with 73 systems. There are 40 Federal Prison P25 systems.

Research continues to add additional International P25 Systems to the data base. Anyone having information to update the list including additions or corrections is urged to contact Steve Nichols director of the Project25 Technology interest Group. This email address is being protected from spambots. You need JavaScript enabled to view it.

The next update is planned for late in the First Quarter of 2016

The list is available using the link below

P25 Systems List November REV 01


Project 25 Technology Interest Group


P25 System of the Month


Monmouth County NJ






The Project 25 (P25) Console Subsystem Interface (CSSI) allows Integration of Zetron’s P25 Console dispatch system with Motorola’s Project 25 Phase II network.

It is the first multi-vendor deployment to utilize the CSSI in a P25 Phase-II solution.




Located in the central part of New Jersey, Monmouth County is the northernmost county along the Jersey Shore. With an area of about 665 square miles and a population of approximately 630,000, it is the fifth most-populous county in the state.

The Monmouth County Sheriff’s Office maintains two consolidated public safety answering points (PSAPs) to manage the county’s public-safety and law-enforcement communications. CentComm in Freehold, NJ, is the main center and serves most of the county. SouthComm in Neptune, NJ, is the smaller of the two and serves the shore area of the county.

“We’re a busy operation,” says Monmouth County Sheriff Shaun Golden. “Our Communications Division answers 9-1-1 calls for 45 of the county’s 53 municipalities and provides dispatch for 20 police departments, 59 fire companies, and 31 first-aid squads. About 550,000 calls come into the communications center annually.”

Golden explains why Monmouth County recently decided to construct and equip a new main communication center. “CentComm was built nearly 30 years ago. Not only had the equipment become antiquated, but we had outgrown the space,” he says. “There was also not enough redundancy built into our communications systems. In fact, we originally built SouthComm as a stop-gap measure to add redundancy until we could update the equipment in the other center.”


The New P25 System and PSAP Gets Underway


When the time was right, Monmouth County decided to not only update their equipment, but to also construct a new facility from the ground up.

Planning the new center was a seven-year process that included soliciting and prioritizing input from agency administrators and other stakeholders connected to the new center. A key undertaking involved finding new communications equipment that would provide the updated functionality, interoperability, redundancy, and ease of use required to meet these stakeholders’—and Monmouth County’s— immediate and projected needs.

Bid specifications were written to ensure that the agency’s requirements were clearly defined.

Then a request for proposals was issued for a solution that would integrate a Project 25 (P25) Phase II network with a state-of-the-art digital dispatch console. Motorola responded with a bid based on a 60-position Zetron Advanced Communications (AcomEVO) system connected through the P25 Console Subsystem Interface (CSSI) to Motorola’s ASTRO 25 Phase II infrastructure. This is the proposal Monmouth County chose for their new center. It was a ground-breaking solution in a number of ways.


The Importance of P25 Phase II and the CSSI


The benefit of P25 Phase II is that it offers twice the spectrum efficiency provided by Phase I. And the CSSI is an open-standards-based interface that allows customers to integrate console and network solutions from different vendors. The deployment for Monmouth County was the first in the industry to offer the CSSI in a P25 Phase-II solution. Zetron’s AcomEVO was the first third-party console to integrate with Motorola’s ASTRO 25 system. The P25 CSSI interface defines the technology that would make this integration possible.


Freedom of Choice


When asked why they preferred a solution that combined the equipment of two different manufacturers, Golden’s answer underscores the value of open standards to customers: it’s about the freedom to pick and choose.

“We wanted the Motorola network and its Phase-II functionality as well as the Zetron Acom console,” he says. “We’ve used Zetron consoles for many years and were very satisfied with their reliability and performance. We like the functionality, customizability and room for growth the Acom system offers. It would also support our legacy VHF radio equipment as well as our new P25 network. This is important because many of our smaller agencies are still on VHF.”


A Smooth Cutover



“We remained in the old center and kept it running until the new center construction was finished and the equipment installation and testing were complete,” says Golden. “The transition to the new center involved not just our new consoles, but all of our equipment, including our CAD and phone lines. Before making the final cutover, we had to ensure that all of the phone lines from the smaller municipalities we support were ringing into the new center. This took several days, but it was a smooth transition.”


Best in state


More than 250 people attended the official ribbon-cutting ceremony held April 29, 2014, to inaugurate the Monmouth County Sheriff’s Office Public Safety Center. The initial response to the center was overwhelmingly positive, and the good reviews continue to roll in.

“Administrators from PSAPs all over the state and throughout the Eastern Seaboard are very excited about it,” says Golden proudly. “They’re telling us it’s the best, most up-to-date PSAP in New Jersey.


A copy of the article can be downloaded on the link below:


P25 System of the Month: Monmouth County NJ



To see 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.




Del Smith, the Project 25 Technology Interest Group Chairman, presented a Project 25 Update to the Communications and Technology Committee at the IACP Conference in Chicago


The presentation included information about new resources available to P25 users on the website, a new P25 pager, and a detailed update of changes to the P25 suite of standards from the recent TIA TR-8 meetings in Seattle.

A future view of ongoing work for the P25 Standards Committees and information on how interested users can become involved in the process was also shared.


A power point  presentation can be downloaded from the link below.


P25 Update for IACP conference





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