Licenced conventional PMR version that includes all base station and repeater functionality and is part of the ETSI standard TS102 658.
dPMR Mode 2 is part of the ETSI standard TS102 658 and brings base station and repeater functionality to dPMR’s FDMA 6.25 kHz narrowband channel access in conventional licensed two-way radio systems, increasing configuration flexibility and coverage.
dPMR Mode 2 offers a logical and flexible migration solution from analogue to a digital conventional voice and data communication systems accommodating base stations and up to 16 repeater sites interconnected over an IP network serving up to 60,000 subscribers.
IP connectivity allows user groups to include PC based terminals from other offices, areas or even countries within a communication system and to remotely control a base station or repeater from a
fixed connection while multiple repeaters are managed by dynamic channel selection or as part of a co-channel wide area network.
dPMR Mode 2 Conventional Repeater Mode
dPMR Mode 2 provides all the basic functions contained within Mode 1 with the additional capability to incorporate multiple base stations and repeaters to significantly extend coverage
across a single site or providing system gateways to connect multiple sites within a simple to deploy and configure conventional (non-trunked) digital radio system.
FDMA & TDMA in Conventional Repeater Mode
Unlike the TDMA (Time Division Multiple Access) method which divides a 12.5kHz channel into two alternating 30msec timeslots to achieve 6.25kHz equivalence, the FDMA (Frequency Division Access) method employed by dPMR divides the same 12.5kHz channel in length, creating two identical 6.25kHz channels, allowing users to effectively double the capacity their usable spectrum without the need for a repeater to
synchronise time slots. This is especially important in ensuring the availability of communication in critical situations when there is increased demand on an allocated radio spectrum.
Mode 2 Operation
Both channel access methods offer distinct features and benefits and the choice between the two should ultimately be made based on its suitability for the end use application
dPMR Mode 2 Equipment
dPMR is an ‘open standard’ which promotes choice by encouraging competing manufacturers to development equipment meeting with dPMR ETSI standards.
As with all dPMR Modes, equipment complying with dPMR Mode 2 is backward compatible with legacy analogue equipment and can operate in both FM analogue and dPMR digital modes giving users a logical and cost effective pathway in the migration from analogue systems to the benefits of digital technology.
Current equipment complying with ETSI standard TS102 658 for operation in dPMR Mode 2 includes hand-portables, mobiles, base stations, modems, repeaters and hand-portable radios meeting with IEC Ex/ATEX based IS specifications for use in explosive atmospheres in the oil, mining and chemical industries.