P25 (Project 25) is not TETRA. They are two distinct digital radio standards used for critical communications. While both are used by public safety agencies, P25 is primarily used in North America (often FDMA/TDMA), whereas TETRA is a European-developed standard (TDMA) widely used elsewhere.
Key Differences Between P25 and TETRA:
Access Method: P25 Phase 1 uses FDMA, while TETRA uses TDMA.
Capacity & Coverage: TETRA is optimized for high-density voice and data (4 time slots in 25 kHz). P25 is known for superior coverage over large, low-density areas.
Compatibility: They are not directly compatible; a P25 radio cannot operate on a TETRA network without a gateway.
Commonality: They share similar digital features, such as voice encryption, caller ID, and message status, but use different signaling
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