Project 25 began as an APCO project in 1989 to create radio standards for digital public safety systems. As documents became formalized and accepted through the Telecommunications Industry Association (TIA) and, finally, through ANSI, the standards suite came to be known more simply as "Project 25."
Key P25 technology benefits are:
- Interoperability: Different agencies can communicate directly with each other.
- Multiple vendors: Competing interoperable products from multiple vendors
- Backwards compatibility: Radios can communicate in analog mode with analog radios, and either digital or analog mode with P25 radios.
- Encryption capability: Protects digital communications (voice and data)
- Spectrum efficiency: Maximizes spectrum efficiency by narrowing bandwidths.
- Improved QoS: 2.8 kbps of 9.6 kbps channel capacity is allocated for FEC.
- Enhanced functionality: 2.4 kbps of 9.6 kbps channel capacity is used for signaling and control.