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X2- TDMA Time Division Multiple Access is no longer supported and virtually all operational equipment has been upgraded to standards-compliant Phase 2.
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Like Phase 2, it was only found on trunked systems. X2- TDMA Time Division Multiple Access uses the same 9600bps bit rate as Phase 1, but uses the two timeslots and AMBE+2 vocoder of Phase 2. X2- TDMA Time Division Multiple Access is a non-standard variation of P25 that Motorola used on some units to implement TDMA Time Division Multiple Access before the Phase 2 standard was completed. Motorola X2- TDMA Time Division Multiple Access Most Motorola conventional repeaters and subscriber equipment can transceive in wide-pulse. Trunked wide-pulse is only found in Motorola Type II trunked systems with digital voice, as it is not compliant with APCO's Project 25 standard. It was designed to create a wider eye in the waveform, allowing very large distances between simulcast sites. Subscriber equipment, such as portables and mobiles, will transmit in C4FM Continuous 4-Level Frequency Modulation regardless of whether it is receiving CQPSK Continuous Quadrature Phase-Shift Keying.Ī non-standard Motorola modulation, wide-pulse, uses 4FSK 4-Level Frequency Shift Keying to occupy a wideband radio channel wide-pulse is rarely found nowadays due to its spectral inefficiency. CQPSK Continuous Quadrature Phase-Shift Keying modulation requires a linear amplifier and thus can only be produced by appropriately equipped fixed equipment, such as repeaters and trunked sites. It is labelled "Compatible" because the deviation at symbol time is the same as C4FM Continuous 4-Level Frequency Modulation, so FM Frequency Modulation receivers can still decode it. CQPSK Continuous Quadrature Phase-Shift Keying modulation is more resistant to inter-symbol interference than C4FM Continuous 4-Level Frequency Modulation, and thus is much easier to transmit in a simulcast configuration. Both uses a 4800bd symbol rate with four-level signaling, resulting in the 9600bps data rate. Phase 1 can use either C4FM Continuous 4-Level Frequency Modulation (continuous 4-level FM Frequency Modulation) or CQPSK Continuous Quadrature Phase-Shift Keying (Compatible Quadrature Phase-Shift Keying, also known as Linear Simulcast Modulation) modulations. Phase 1 uses a 9600bps data rate to transfer IMBE-encoded voice or packet data. Modulations Phase I FDMA Frequency Division Multiple Access
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