P25: Short for Project 25, was developed by the American Association of International Public Safety Communications Officials(APCO), the National Telecommunications Regulatory Association(NASTD), and the United States Federal Government User and Telecommunications Industry Association(TIA), to meet the needs of government organizations and public safety departments. The wireless communication standard, which is also proposed to the International Telecommunication Union to become one of the global open digital mobile communication standards. The P25 adopts a large-area system design, with a large coverage of a single station, and a small number of base stations in the network construction system. It is suitable for users with wide coverage areas, complex scheduling functions, and high security requirements for communication security. It is widely used in military, government, and public security. And the field of emergency communications.
What are the advantages of the P25 standard?
The technical advantages of the P25 standard are obvious, mainly in the compatibility, a wide range of suppliers, P25 open standards allow products of each manufacturer to be compatible with each other; backward compatibility and portability, the first phase of the P25 digital two-way radios can be backwards Compatible with analog two-way radios.
By selecting P25-compatible device products, users can guarantee that their investment will continue to be used in the future; voice and data encryption, P25 standard includes requirements for digital communication (voice and data) encryption capabilities; improve spectral efficiency, P25 narrows Bandwidth improves spectral efficiency, P25 standard divide 12.5KHz system into 6.25KHz or equivalent spectral efficiency performance; high sound quality.
The P25 standard adopts the large-area system design, and the single-station coverage is large. The number of base stations in the network-building system is small, which is suitable for users with wide coverage areas and complex scheduling functions.
Which countries or regions use the P25 system?
As of last year, the United States, the United Kingdom, Australia and Canada have more than 2,100 P25 systems, and other P25 systems operating in more than 80 countries around the world.
It is reported that there are 37 states in the United States with statewide P25 systems - most of which are in deployment phase 1, mostly using the 700 or 800 MHz band, or in some cases using the VHF band. The other 13 states either do not have a statewide P25 system or are working hard to equip them - including the states with the largest population in the United States: California, Texas, New York, and Florida.
What are the development trends of the P25 system?
In the past few years, new requirements for P25 system functionality and interoperability have been put in place, and testing is now required to demonstrate interoperability. In the past month, eight major suppliers have been tested in new recertified laboratories. In the past few years, the US Department of Homeland Security (DHS) has done a lot of work to normalize the interfaces between systems and eliminate proprietary methods to prevent interoperability, especially in terms of encryption. "The early P25 system had lower voice quality, and the shift to higher frequencies was a direction due to reduced coverage and demand for more infrastructure.