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2. Digital mobile radio - Wikipedia

   en.wikipedia.org/wiki/Digital_mobile_radio

   Digital mobile radio. Digital mobile radio (DMR) is a digital radio standard for voice and data transmission in non-public radio networks. It was created by the European Telecommunications Standards Institute (ETSI), [1] and is designed to be low-cost and easy to use. DMR, along with P25 phase II and NXDN are the main competitor technologies in ...

3. Project 25 - Wikipedia

   en.wikipedia.org/wiki/Project_25

   Project 25 ( P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1] P25 radios are a direct replacement for analog UHF (typically ...

4. Time-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Time-division_multiple_access

   Time-division multiple access ( TDMA) is a channel access method for shared-medium networks. It allows several users to share the same frequency channel by dividing the signal into different time slots. [ 1 ] The users transmit in rapid succession, one after the other, each using its own time slot. This allows multiple stations to share the ...

5. NXDN - Wikipedia

   en.wikipedia.org/wiki/NXDN

   The basic NXDN channel is digital and can be either 12.5 kHz or 6.25 kHz wide. 6.25 kHz dual-channel systems can be configured to fit within a 12.5 kHz channel. This effectively doubles the spectrum efficiency compared to an analog FM system occupying a 12.5 kHz channel. The architecture of NXDN is such that two NXDN channels, within a 12.5 kHz ...

6. Digital private mobile radio - Wikipedia

   en.wikipedia.org/wiki/Digital_private_mobile_radio

   dPMR or digital private mobile radio, is a common air interface for digital mobile communications. dPMR is an open, non-proprietary standard that was developed by the European Telecommunications Standards Institute (ETSI) and published under the reference ETSI TS 102 658. A simplified version of the dPMR protocol intended for licence-free ...

7. PMR446 - Wikipedia

   en.wikipedia.org/wiki/PMR446

   PMR446 (Private Mobile Radio, 446 MHz) is a licence-exempt service in the UHF radio frequency band and is available for business and personal use in most countries throughout the European Union. [1] PMR446 is typically used for small-site, same-building and line of sight outdoor activities. Equipment used ranges from consumer-grade to ...

8. Professional mobile radio - Wikipedia

   en.wikipedia.org/wiki/Professional_mobile_radio

   Professional mobile radio. Professional mobile radio (also known as private mobile radio ( PMR) in the UK) are person-to-person two-way radio voice communications systems which use portable, mobile, base station, and dispatch console radios. PMR systems are based on such standards as MPT-1327, TETRA, APCO 25, and DMR which are designed for ...

9. Self-organized time-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Self-organized_time...

   Self-organized time-division multiple access ( STDMA) is a channel access method designed by Håkan Lans, [1] based on time-division multiplexing . The term "self-organized" describes the manner in which time slots are assigned to users. Time-division multiple access (TDMA) divides a channel into frames, which furthermore are subdivided into a ...