# 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), 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 achieving 6.25 kHz equivalent bandwidth using the proprietary AMBE+2 vocoder. DMR and P25 II both use two-slot TDMA in a 12.5 kHz channel, while NXDN uses discrete 6.25 kHz channels using frequency division and TETRA uses a four-slot TDMA in a 25 kHz channel. | |-|-| | | wikipedia:: [Digital mobile radio](https://en.wikipedia.org/wiki/Digital_mobile_radio) | aka:: DMR DMR hotspots are often based on the open source Multimode Digital Voice Modem, or [[MMDVM]], hardware with firmware developed by Jonathan Naylor.