DMR gets attention and with good reason

Previous articles in Radio Comms Asia-Pacific have presented varying views on DMR technology and may have led some readers to believe that DMR is another digital radio ‘flash in the pan’ that has no place in an already busy Australian digital radio landscape.

My own view is that nothing could be further from the truth and that with the current availability in Australia of ETSI open standard DMR products that range from Tier III wide area trunking systems to conventional IP connected, there has never been a better time of real choice for digital radio purchasers.

Unlike the manufacturers of the vast majority of other digital offerings, there are large and well-funded manufacturers who are not afraid to produce an open standard digital radio product.

Radio system planners, consultants, network vendors and end users now have the ability to implement digital radio that allows seamless operation of other manufacturers’ equipment and to benefit from market competition.

A significant number of radio manufacturers, who are well known and who operate in the Australian market, have joined the DMR Association and have signalled their intention to produce ETSI-compliant DMR terminal, infrastructure and applications.

Today the DMR MOU boasts 16 Category1 members, five Category2 members and seven Category3 members and two Partners, and while there had been only one manufacturer pushing the technology, more than a million DMR terminals were sold from October 2007 to June 2011.

DMR products available in Australia today already interoperate with each other on a voice communications level and as other manufacturers arrive in the market later this year and early next year, market competition will see the already significantly well priced and spectrally efficient DMR terminals provide even greater choice for DMR radios.

The example that MPT1327 systems have provided in Australia is that by deploying open standards systems and compliant terminals, users get real choice and DMR trunking will provide the same rich feature set of MPT but with an extensive range of capabilities that only digital radios can deliver.

DMR manufacturers are already producing quad mode MPT1327 and DMR terminals and infrastructure that will support network vendors and their MPT users.

On a technical level, DMR and dPMR are both low-cost digital standards, one being FDMA which occupies a true 6.25 kHz channel spacing in the available frequency spectrum. DMR is a two-slots TDMA technology that alternates between slots to mimic the 6.25 kHz, which is often referred to as equivalent 6.25 kHz.

Unlike TETRA digital standard, both these low-cost technologies are backward compatible to analog product, which simplifies analog to digital migrations.

This effectively means that the users considering an upgrade to digital have the added advantage of re-using much of in-place towers and antenna systems as they have the same coverage as existing analog radio if the radiated power is kept the same.

As conventional users migrate to a new system on the back of ACMA changes, additional DMR features such as native IP connectivity available on DMR base stations and all the terminal bells and whistles that many users will require will, in my opinion, propel those users looking for a digital solution towards the cost-effective system of choice.

In the past the only digital option for two-way radio users has been the very cost-prohibitive APCO P25 and TETRA trunking systems. With the release of the DMR Tier III trunking, it has been proved that DMR Tier III is good enough to replace the aging analog trunking systems such as the MPT1327, SmartNet, SmartTrunk, LTR and Privacy Plus.

As an example, in January 2010 Communications Corporation deployed its DMR Tier III police digital trunking, PDT, for the Chinese police as the proposed national replacement for an existing country-wide MPT1327 system.

The installed PDT DMR Tier III exceeded expectations and as a result, in June 2011, the same enhanced DMR Tier III trunking, comprising four base stations with several hundred terminals, was commissioned for Shenzhen.

I believe that we will soon see ETSI standard dPMR product offerings in the low end of the Australian market and I believe the local market, and that in NZ, will choose carefully with its digital dollars.

Having been led previously into the purchases of proprietary systems which only allow a single choice of product, they will now steer towards a technology from suppliers that are brave and confident enough to provide product and systems based on an open standard.

Like our mobile phone networks, which are based on an open standard, the digital era in our radio communications industry is inevitable and people who convert now to an open standard product will be rewarded with peace of mind.

Standardisation serves its purpose and for users it is an important factor when choosing a new digital system as it gives them the power of choice and also means lower cost of ownership as manufacturers will be competing to offer solutions.

In today’s digital radio market, informed purchasers look at features and advantages.

The case for DMR is very similar when compared to dPMR, the 40% energy saving is a big plus for DMR as it will prolong a normal eight-hour radio to 11 hours of battery life when operated in digital mode!

DMR also allows true plug and play, that is to say you just buy a DMR product and you can immediately program your current assigned frequencies and start using!

In the case of dPMR, one will have to go to frequency regulators to obtain a licence to operate off frequency by 3.125 kHz to co-exist with analog assignments and dPMR means that system operators will have to have two frequency licences; and if double traffic capacity is required, three frequency licences are required.

DMR is very much in the future for the professional mobile radio industry in Australia and New Zealand and open standard DMR products have arrived… and will stay for a long time.

Posted on Sept. 26th, 2011 by Combined Communications.

Source: www.radiocomms.com.au