APCO P25 (Project 25) is a set of standards developed by the joint efforts of the Association of Communications and Public Safety (APCO), the National Association of State Telecommunications Directors , NASTD, the federal agency of national systems Communications ( Federal Agencies and the National Communications System , NCS) and the Telecommunications Industry Association (TIA). P25 is an open architecture communication system designed to meet the operational, security needs of government, government and other organizations. The P25 standard defines the interfaces, interoperability and capabilities of any system compatible with the P25 standard. The P25 radio station can operate in analog mode for compatibility with existing analog FM radio stations, as well as in analog or digital mode with other P25 radio stations. The P25 standard is not closed, so any manufacturer can create its own digital P25 radio stations.
Content
The main objectives of the project P25
- Based on the principles of open architecture, provide additional competition between different communication systems.
- Provide effective, reliable and cheap communications to government and other organizations.
- Provide improved functionality and additional features with a focus on public safety needs.
- Improve the efficiency of using the radio frequency spectrum.
Project Phase P25
Communication systems of the P25 standard are divided into several generations (phases) for a phased and smooth transition from outdated analog systems to digital ones.
Phase 1
Phase 1 radio stations operate in the 12.5 kHz band in analog, mixed and digital modes. For digital transmission, radios of this generation use C4FM (continuous 4 level FM, continuous 4-level FM) non-linear modulation and are backward compatible with existing FM radio stations. In addition, the P25 standard describes an open interface to external radio equipment to simplify the docking of radio communication systems from different manufacturers.
Phase 2
Communication systems of this generation are currently under development in order to find a way to transfer data at 4800bit / s in the 6.25 kHz band. P25 Phase 2 radios use modulation with time and frequency multiplexing (TDMA and FDMA) to efficiently use the spectrum. In addition, issues of interaction with existing equipment, interfaces with base stations and repeaters, radio frequency distribution, etc. are still being resolved.
Phase 3
The purpose of Phase 3 equipment will be to ensure high-speed data transmission for public safety purposes. Activities will focus on airborne and terrestrial broadband radio communications, with which it will be possible to transmit and receive voice, video and data at high speed over a large area. The European Telecommunications Standards Institute (European Telecommunications Standards Institute (ETSI)) and TIA are working together on Phase 3, known as the MESA project (Mobility for Emergency and Safety Applications, Security and Emergency Applications)
Manufacturers of hardware and software APCO P25
- Motorola
- Etherstack
- Icom
- Integrit
- Spectra Engineering
- Teltronic
- Tait
- Harris Corporation
- Yaesu
- JSC "Radio code"
- CJSC "ASTRAKOM ENGINEERING"
See also
- D-STAR