Modern Standards – P25

Project 25 is a series of living standards from the TIA TR-8 Committee, which is made up of customer representatives from federal, state, and local public safety organizations. The Project 25 standards are developed under the guidance of the Telecommunications Industry Association (TIA) whose standard formulating committees include manufacturer representatives. TIA standards are developed using open procedures that are required by the American National Standards Institute (ANSI).

Catalyst’s scalable solutions provide Project 25 voice dispatch, interoperability and incident command using three multi-vendor standards, all providing Unit ID & Emergency.

P25 Control Station Interface

Catalyst offers multiple choices of control stations or mobile radios from several vendors.

The features now available using P25 control stations vary by radio model. A few examples are:

  • Remotely send radio voice via IP Network from Console to radio gateways
  • Have remote Push-to-Talk (PTT) Control of radios attached to radio gateways
  • Receive Unit ID of subscriber radios talking to gateway radios
  • Have remote direct access to 100’s of channels programmed into gateway radio
  • Hear the channel grant message with remote PTT of gateway radio
  • Receive end-of-call message from gateway radio
  • Display selected channel ID with text and/or graphics
  • Display received channel ID with text and/or graphics
  • Receive indication of a queued call on the network
  • Display on screen when a transmitter is off-line
  • Remotely select Zone or System
  • Put the radio attached to the gateway into and out of scan mode
  • Instigate a private call
  • Patch a P25 radio channel to other radio systems like SmartNet/SmartZone, DMR and EDACS
  • Send Unit ID of subscriber radios from other radio systems to a P25 subscriber radios

Console Sub-System Interface (CSSI)

  • P25 Trunking Wireline Interface
  • Provides Priority (Pre-Empt)
  • Multiple Simultaneous Calls

Digital Fixed Station Interface (DFSI)

  • P25 Conventional Wireline Interface
  • Analog and Digital Calls
  • Common Air Interface (CAI)

P25 Benefits

  • To obtain maximum spectrum efficiency
  • To purchase radios and other equipment from more than one vendor
  • To allow effective inter-agency communications
  • To migrate systems without replacing all of your equipment

Intelligent interfaces available for various radios that operate on P25 Conventional and P25 Trunked Radio systems. Contact Catalyst for more information.

All of these P25 products are currently available for purchase from Catalyst.
Above our Project 25 development efforts, Catalyst supports the efforts of Project 25 through our membership in the Project 25 Interest Group (PTIG).

More information about Project 25 can be obtained from the Association of Public Safety Communications Officers (APCO).


Notice anything different? We'll be updating everyone this month with news about what is going down at IWCE in Orlando March 5-8. We're excited to tell you we'll have a major new product announcement. Here's a spoiler alert! Can you guess??? pic.twitter.com/dINnbzzKkp