DMR Digital Mobile Radio
Digital Mobile Radio (DMR) is an international digital radio standard developed by the European Telecommunications Standards Institute (ETSI), and first ratified in 2005. More than a decade ago, vendors and users of radio systems recognized that the existing analog trunking standards required updates with modern techniques to provide:
- Improved voice quality
- Improved functionality such as Location information)
- Improved security (i.e. Authentication and Encryption)
- Improved channel efficiency (2 slot TDMA)
As a result, today, we have a complete set of standards which cover voice, data services, and conformance testing.
DMR aims to provide an affordable, low-complexity digital standard to replace analog radio.
The ETSI DMR Standard defines three different tiers :
- Tier I(unlicensed): DMR equipment works in Direct Mode (unit-to-unit) on public frequencies. Tier 1 DMR devices are best for individuals, recreation, small retail, or other situations that do not require wide area coverage.
- Tier II(licensed conventional): This Tier is aimed to be a direct replacement for the analog conventional radio system. These DMR systems operate under individual licenses working in Direct Mode (unit-to-unit) or using a Base Station (BS) for repeating. It has a degree of wide-area coverage and is targeted at users “who need spectral efficiency, advanced voice features and integrated IP data services in licensed bands for high-power communications.”
- Tier III(licensed trunked): DMR trunking systems operate under individual licenses with a controller function that automatically regulates the communications. It also supports packet data services in a variety of formats, including support for IPv4 and IPv6. It is ideal for organizations looking to migrate from MPT-1327/EADS/LTR (logic trunked radio) systems or who want the full benefits of managed trunking, voice and data solution.
We supply DMR technology from the leading global manufacturers like:
HYTERA , Motorola ,Tait ,Sepura