The DMR Standard

Digital Mobile Radio is a standard developed by the European Telecommunications Standards Institute (ETSI). It was officially recognised in 2005.

DMR operates inside the existing 12.5kHz channel spacing used in licenced land mobile frequency bands all across the world, and also has the ability to use 6.25kHz channel spacing. DMR provides voice and data.

There are three tiers of DMR:

• Tier 1: unlicensed

• Tier 2: licensed conventional

• Tier 3: licensed trunked

The DMR standard is defined by 4 documents:

• Part 1: DMR Air Interface (AI) protocol

• Part 2: DMR voice and generic services and facilities

• Part 3: DMR data protocol

• Part 4: DMR trunking protocol

Also, the designers guide:

• Digital Mobile Radio (DMR) General System Design

All the above documents are PDF. To read them, you'll need Adobe Reader