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MDC (Motorola Data Communications), also known as Stat-Alert, MDC-1200 and MDC-600, is a Motorola two-way radio low-speed data system using audio frequency shift keying, (AFSK). MDC-600 uses a 600 baud data rate. MDC-1200 uses a 1,200 baud data rate. Systems employ either one of the two baud rates.
Some professional systems use a phase-reversal of the CTCSS tone at the end of a transmission to eliminate the squelch crash or squelch tail. This is common with General Electric Mobile Radio and Motorola systems. When the user releases the push-to-talk button the CTCSS tone does a phase shift for about 200 milliseconds.
The Motorola Minitor is a portable, analog, receive only, voice pager typically carried by civil defense organizations such as fire, rescue, and EMS personnel (both volunteer and career) to alert of emergencies. The Minitor, slightly smaller than a pack of cigarettes, is carried on a person and usually left in selective call mode.
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In Canada, TELUS calls it "Mike's Talk-Around." It is the same system as used with Motorola's stand-alone DTR-series walkie-talkies, but DTR handsets and iDEN handsets set to MOTO Talk are not able to communicate with each other due to software settings. Motorola Solutions Inc sells DTR series two-ways radios that carry this peer to peer protocol.
A significant advantage of PTT is the ability for a single person to reach an active talk group with a single button press; users don't need to make several telephone calls to coordinate with a group. Push-to-talk cellular calls similarly provide half-duplex communications – while one person transmits, the other(s) receive. This combines the ...
iDEN supports either three or six interconnect users (phone users) per channel, and six dispatch users (push-to-talk users) per channel, using time-division multiple access. The transmit and receive time slots assigned to each user are deliberately offset in time so that a single user never needs to transmit and receive at the same time.
In March, 2017, Motorola Solutions acquired Interexport SA. [14] In August 2017, Motorola Solutions announced it completed the acquisition of Kodiak Networks, a privately held provider of broadband push-to-talk (PTT) for commercial customers. [15] Its clients included AT&T, Vodafone, KPN, Verizon, Telefonica, Bell Canada, and Vivo.