Not all manufacturers’ trunking implementation is Tier III compatible. Tier III builds upon Tier II, adding trunking operation involving multiple repeaters at a single site. ![]() Most amateur radio implementations of DMR are using voice on both time slots. IP Site Connect (IPSC) for interconnecting repeaters over the Internet is vendor specific and is not part of the ETSI standards at this time. Each time slot can be either voice and/or data depending upon system needs. [ Tier II is 2-slot TDMA 12.5 kHz wide peer-to-peer and repeater mode specification, resulting in a spectrum efficiency of 6.25 kHz per channel. ![]() The use of the Tier I standard has been expanded into radios for use in other than the unlicensed dPMR446 service. It is a single channel FDMA 6.25 kHz bandwidth the standard supports peer-to-peer (mode 1), repeater (mode 2) and linked repeater (mode 3) configurations. Tier I is a single channel specification originally for the European unlicensed dPMR446 service. ![]() ![]() Analog Time Slots & Talk Groups Zones Color Codes Code Plugs Scanning and Roaming Simplex Admit Criteria Repeater Access Basic ProgrammingĢ DMR for DUMMIES Digital Mobile Radio (DMR) was developed by the European Telecommunications Standards Institute (ETSI) and is used worldwide by professional mobile radio users.
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