![]() Data relays through serial port interconnection between the mobile and repeater. It also establishes remote RF link between sites through serial port back-to-back connection to repeater, the mobile transmits signal, data and voice. With the Advanced Back-to-back Connection, a radio receives a bunch of cross patch calls from another system, recognising the PTT ID and receive text messages from initiator. More powerful than traditional back-to-back connection, this new feature sends not only audio, but also signaling and data. It greatly enlarges full-duplex coverage beyond Trunking Mode Operation (TMO) long calls are made hands-free and much more efficiently between radios, and even between radios and phones. Simultaneous voice transmission and reception in full duplex call now is available in Repeater Mode Operation (RMO) and Direct Mode Operation (DMO).
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