Icom dPMR mode 3 FDMA system

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The dPMR mode 3 technology will provide a scalable, digital open standard that provides high-level features and good performance.

It is the digital successor of MPT1327, developed by Fylde. Icom and Fylde began discussions in 2005 to create a digital upgrade to the analog trunking system.

The dPMR protocol specifically targets highly functional solutions by using low-complexity technology. It is a narrowband (6.25 kHz) FDMA system that is 100% digital and offers many forms of voice and data applications.

Essentially, FDMA offers 6.25 kHz channels as standard, unlike TDMA, which can only offer equivalence. The reason for this is that FDMA channels are divided by frequency, whereas TDMA effectively splits one 12.5 kHz channel into two time slots.

dPMR Mode 3 provides a full multichannel, multisite trunked network, which is fully managed by specific beacon channels at each site. Mode 3 operation is controlled by the Fylde Multilingo controller, which also manages radio tracking, call set-up and maintenance, event recording and online upgrades. The name Multilingo refers to the controller’s cross-protocol communication feature, allowing MPT1327 to talk to dPMR, and vice versa.

Existing analog trunked radios can be upgraded one at a time if needed and full-system swap-outs are also possible. When upgrading existing Fylde MPT systems, there is no system downtime and almost no downtime to other systems (provided all controllers are upgraded at the same time). The system also features graceful degradation, in the event of infrastructure failure.

It suits a wide range of applications, including mining, security, construction and hospitality.