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What is DMR?

DMR is the most widely adopted digital two-way radio system, in active use in over 100 countries, and is the market leading digital PMR technology.

Digital Mobile Radio (DMR) is a digital radio standard specified for professional mobile radio (PMR) users developed by the European Telecommunications Standards Institute (ETSI), and first ratified in 2005.

The standard is designed to operate within the existing 12.5kHz channel spacing used in licenced land mobile frequency bands globally and to meet future regulatory requirements for 6.25kHz channel equivalence. The primary goal is to specify affordable digital systems with low complexity. DMR provides voice, data and other supplementary services. Today, products designed to its specifications are sold in all regions of the world.

The DMR protocol covers unlicensed (Tier I), licensed conventional (Tier II) and licensed trunked (Tier III) modes of operation, although in practice commercial application is today focussed on the Tier II and III licensed categories.

The standards that define DMR consist of four documents. These can be downloaded free of charge from the ETSI website. Follow the links below.
TS 102 361-1: the DMR air interface protocol
TS 102 361-2: the DMR voice and generic services and facilities
TS 102 361-3: the DMR data protocol
TS 102 361-4: the DMR Trunking protocol

There is also a designer’s guide encompassing elements from all standards parts that is an easier read:

TR 102 398: DMR General System Design

DMR White Papers

DMR Interoperability Process

Key Issues To Consider When Switching to Digital - PPT
Key Issues to Consider When Switching to Digital - PDF

FCC Narrowbanding Mandate

Benefits of DMR

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