With ever increasing demand on the radio spectrum and the limited number of frequencies available, the need for efficient technologies that maximise the utility of those frequencies has never been greater.
dPMR is a spectrum efficient, true 6.25kHz ‘ultra-narrowband’ digital radio communications technology for application in Private Mobile Radio (PMR). It was developed by the European Telecommunications Standards Institute (ETSI) in 2007 to specifically target highly functional,
spectrum efficient solutions employing proven, low cost and low complexity Frequency-Division Multiple Access (FDMA) technology to meet future regulatory requirements for 6.25kHz channel equivalence.
The three broad categories in which dPMR has the capability to serve are:
(1) Consumer and short-range industrial applications
(2) Professional/Business/Operations-Critical applications
(3) Public Safety/Mission-Critical applications.
dPMR is developed in ‘tiers’ to offer a scalable communication solution that includes license-free dPMR 446 mode (in a 446.1 to 446.2 MHz band) and licensed modes subject to national frequency planning:
• Tier 1 is the low-cost, licence-exempt 'digital PMR446' defined by ETSI Technical Specification TS 102 490.
• Tier 2 is for the licensed professional market, offering peer-to-peer mode (Mode 1), repeater mode (Mode 2) and trunked (managed access) operation (Mode 3). Tier 2 is defined by ETSI Technical Specification TS 102 658.
These ‘Tiers’ are sub-divided into four functional levels:
dPMR 446 is a licence-free two-way radio communication format for use in peer-to-peer operations without base stations or repeaters in the 446 MHz UHF band. This technology is covered by the ETSI standard TS102 490.
dPMR Mode 1 forms the basis for all forms of licenced PMR use and is part of the ETSI standard TS102 658.
PMR Mode 2 is the licenced conventional PMR version that includes all base station and repeater functionality and allows interfaces via gateways (Telephone, IP etc.) and is part of the ETSI standard TS102 658.
dPMR Mode 3 is part of the ETSI standard TS102 658 and offers managed access, multi-site trunked systems and systems where the full functionality of the protocol is available.
dPMR™ Product Class Interoperability
To assist users in the selection of appropriate dPMR products and solutions for specific applications, the dPMR Association has introduced Product Classes to distinguish between the compatibility and capabilities of different dPMR compliant equipment.
Full details can be found here, but potential users are warned that equipment offered for sale which has not been tested to the satisfaction of the dPMR Association Technical Working Group and Certified for compliance with all relevant
parts of the ETSI conformance and interoperability standards for dPMR are unlikely to meet with ETSI standards or offer interoperability with compliant dPMR marked equipment in any of the dPMR Product Classes.
Promoting choice and best value
dPMR is an open standard supported by number of equipment manufacturers, specialist technology companies and software developers which promotes a dynamic competitive environment resulting in greater choice and lower costs to the end-user.
The dPMR Association actively encourages the adoption of the standard and makes no charge or licensing fee for its IPR save that all equipment designed for use with the technology or carrying the dPMR mark are certified as compliant through
the dPMR testing and certification programme.
dPMR, the logical and cost effective pathway from analogue to digital
All dPMR functional levels and Modes are backward compatible with legacy analogue radio systems and equipment which makes it the logical choice when evolving a radio system from analogue to digital at a pace that suits operational requirements or budget constraints.
Equipment certified as compliant with dPMR will feature Analogue FM – Digital dPMR mixed mode operation either activated automatically or through user selection so seamless communication between old and new can be maintained throughout the transitional period.
Migrate from analogue MPT 1327 to dPMR with ease
For existing users of MPT 1327 based trunked radio systems, dPMR Mode 3 offers an immediate and cost-effective migration path to digital without compromising on functionality or system features.