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dPMR is an open, non-proprietary standard that was developed by the European Telecommunications Standards Institute.dPMR is an open, non-proprietary standard that was developed by the European Telecommunications Standards ===NXDN===Institute. NXDN is intended for commercial Private Land Mobile Radio (PLMR) and some public safety communications systems. NXDN uses Frequency-Division, Multiple-Access (FDMA) technology. NXDN is digital and can be either 12.5 kHz or 6.25 kHz wide. The AMBE+2 voice codec is used.