Table of Contents
What is the difference between P25 Phase 1 and Phase 2?
P25 Phase 1 was designed to use the same bandwidth as a narrow band FM channel, meaning they could be used side by side, and narrow band FM channels could gradually be replaced by P25 digital channels. Phase 2 is more spectrally efficient than Phase 1, providing two effective channels per 12.5 kilohertz bandwidth.
Is P25 a Tetra?
TETRA allows simultaneous voice and data services so that both needs are covered by a single network; while P25, as it does not provide simultaneous voice and data service, normally requires an additional radio system to cope with data requirements.
Is Mototrbo P25 compliant?
Is MOTOTRBO compatible with P25 technology/systems? No. The P25 protocol (TIA Project 25 standard) was adopted for public safety sector use and currently uses 12.5 KHz FDMA technology.
Is encrypting radio illegal?
(a) Encryption is permitted on all but the two nationwide Interoperability calling channels. Radios employing encryption must have a readily accessible switch or other readily accessible control that permits the radio user to disable encryption.
What is P25 Phase 2?
More information about P25 Phase 2. (P25) Phase 2 refers to P25 requirements and standards for a digital Common Air Interface (CAI), Time Division Multiple Access (TDMA) based, which provides one voice channel per 6.25 kHz channel spectrum efficiency.
What is P25 digital data&voice (astro-25)?
Currently, Motorola’s implementation of P25 digital data & voice is marketed as “ASTRO-25”, for both older Motorola Type II and Phase I systems for two of their types of trunking solution, they utilize the P25 IMBE vocoder, with their newer AMBE or AMBE2 radios are backwards compatible with systems that use the IMBE packaging.
What type of voice does the P25 support?
P25 supports encrypted voice. Phase 1 uses a 9600bps data rate to transfer IMBE-encoded voice or packet data. Phase 1 can use either C4FM (continuous 4-level FM) or CQPSK (Compatible Quadrature Phase-Shift Keying, also known as Linear Simulcast Modulation) modulations.
What is the difference between P25 and X2 TDMA?
X2- TDMA is a non-standard variation of P25 that Motorola used on some units to implement TDMA before the Phase 2 standard was completed. X2- TDMA uses the same 9600bps bit rate as Phase 1, but uses the two timeslots and AMBE+2 vocoder of Phase 2.