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Digital


Discussing DMR: as manufacturers implement a further level of the standard, Land Mobile’s experts met in London to discuss its potential


Tier III: a standard for digital trunking


With the Tier III DMR products recently announced by several manufacturers, radio users with more complex requirements have new options for upgrading to digital. Land Mobile convened a panel of experts to examine the issues


D 14


MR, the ETSI digital radio standard which provides two time-slots for voice or data in a standard 12·5kHz


business radio channel, has quickly become established as a technology upgrade for tradi- tional PMR systems. Tier II DMR – a digital replacement for conventional, non-trunked, analogue PMR – offers clear, noise-free speech together with reliable radio coverage, opportu- nities for integration with IT systems, and it doubles the communication capability of exist- ing channels. But with the arrival of the third tier of DMR,


the benefits of this open technology will be ex- tended to operators of all but the most complex radio systems. It now offers an attractive up- grade path for trunked and networked instal- lations – today’s MPT 1327 trunked analogue networks, for example. However, opening Land Mobile’s round-table


discussion on the coming Tier III world, Adri- an Grilli cautioned against discussing Tier III in isolation. “We recognize that, in the world in which we operate, there are other technolo- gies around”, he said. “One of the problems I always envisaged in the early days of Tetra was


that people used to stick their heads in the sand quite a lot and not recognize the reality of the world out there. So Tier III DMR has got to survive in the real world.” Te morning opened with views on Tier III


from the experts around the table, beginning with Tim Cull, who supplied a perspective from the FCS, the telecoms industry’s trade body. “Tier III DMR is a long-awaited en- hancement of the DMR basic standard which has already proved extremely successful”, he said, “and there is absolutely no reason to be- lieve that Tier III won’t also be strong in those


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