DMR TWG IOP
Analyser Toolset

The official release of the DMR TWG IOP Analyser toolset and supporting documentation is now available for Category 1 members.

Supporting the
ETSI DMR Standard

The Digital Mobile Radio Association plays a crucial role
in the continued success and evolution of DMR technology, ultimately aiming to elevate the user experience.

DMR splits one channel into two, instantly doubling your capacity without requiring investment in new repeater sites or additional frequencies.

By introducing the AIS application interface, the Digital Mobile Radio Association has redefined user capability, offering a sophisticated toolkit for advanced functionality and control.

Join a global network of over 15 million users. As the driving force behind Digital Mobile Radio, our dedicated team provides unmatched support and expertise to our growing international community.

Driving Excellence Since 2005 - The DMR Association’s core mission is to support the European Telecommunications Standards Institute (ETSI) in the continuous development of the DMR standard. We focus specifically on optimizing commercial applications across Tier II and Tier III.

Shape the Future of DMR - We warmly welcome all businesses who champion the professional use of Digital Mobile Radio. By becoming a member, you help us advance this vital technology and define the next generation of communication standards through collaborative industry leadership..

Improving standards:
Elevating experiences

We combine our knowledge and expertise with education, awareness, certification, and interoperability training to guarantee that today’s digital radio technology customers experience the highest level of service. We invest our time and energy to futureproof your investments.

As a member of the DMR Association you’ll benefit from the frequent and direct communications that we hold with global regulators, trade bodies and standards organisations. We are committed to ensure that all DMR products reach the market within a successful, open, multi-vendor chain and that our members gain from continuous, competitive development.

Ultimately, our goal is to turn technical complexity into market opportunity. Through structured education and verified interoperability, we provide the clarity and consistency needed for the industry to thrive.

The Technical Working Group: Driving The Standard

The Mission: Our focus is the Interoperability (IOP) of Digital Mobile Radio equipment. We maintain the official framework that enables products from different manufacturers to work seamlessly together. To achieve DMR Association certification, manufacturers must successfully complete testing according to our established IOP Test Suites.

The Solution: To streamline this process, we provide advanced software tools designed to automate and standardize IOP validation. By verifying device behavior against a centralized reference, we ensure that test results are consistent, objective, and easily auditable across the industry.

Access & Participation These IOP Tool Applications and Documentation are available exclusively to Category 1 members via the DMR Association website.

We strongly encourage Category 1 members planning to participate in IOP test sessions to download and utilize these applications. Your active use and technical feedback are vital to the continuous improvement of our testing environment.

Breaking down proprietary barriers, the DMR Applications Interface (AIS) delivers a standardized way for applications and networks to interact, driving a more open and flexible digital radio ecosystem.

Application Interface (AIS)

DMRA News

The DMR Association is delighted to announce that Winnertech has joined our membership as a Category 1 member.

Headquartered in Seoul, South Korea, Winnertech Co., Ltd. has specialised in the research, development, and manufacture of high-performance two-way radio equipment for over two decades.

Drawing on twenty years of engineering expertise, the company develops robust digital DMR hand portables and bespoke wireless systems designed to deliver crystal-clear voice clarity and secure connectivity across high-demand industrial sectors, construction sites, and commercial facilities.

Backed by strict quality standards and continuous innovation, their durable communication platforms are engineered to maintain dependable, mission-critical links even in the harshest working environments.

Welcome Winnertech to the DMR Association

Welcome WTE Limited

Established in New Zealand in 2016, WTE Limited designs advanced radio hardware for critical messaging, telemetry, search-and-rescue, and DMR networks. Specialising in ultra-low-power DMR receiver technology, our globally deployed OEM systems enable secure remote equipment control across landmarks, universities, and government bodies.

Welcome Sybet International

Sybet International develops mission-critical communication, tracking, and collision-avoidance systems for mining, tunnelling, and confined spaces. Delivering certified wired and wireless solutions—including SWAR2-EX, FixCom, and Proxima—we enhance operational safety and personnel coordination in hazardous environments.

Welcome Astra Rafael ComSys

Astra Rafael ComSys (ARC) is a premier technology joint venture between Astra Microwave and Rafael. Specializing in indigenous digital solutions, ARC delivers next-generation Software Defined Radios, Electronic Support Measures, and Cognitive Radio systems for defense and mission-critical operations.

The DMR Association: Your trusted partner for digital radio success, boasts a diverse membership of over 200 organisations from around the world who play a crucial role in the development and widespread adoption of DMR technology.

Members of the DMR Association >

Key features of the DMR standard

Interoperability between manufacturers
Backwards spectrum compatibility
State of the art Forward Error Correction
Options for traffic encryption

IP Data
Fast Automatic Vehicle Localisation (AVL)
Optional encryption for secure communications
Direct Mode of operation

Doubling of capacity in existing channels
Data applications interface (AIS)
Two-slot Time Division (TDMA) operation
Green credentials

DMR enables a single 12.5 kHz channel to support two simultaneous and independent calls. This is achieved using TDMA, Time Division Multiple Access. Under TDMA DMR retains the 12.5 kHz channel width and divides it into two alternating timeslots A and B where each timeslot acts as a separate communication path.

Each communication path is active for half of the time in 12.5 kHz of bandwidth, each uses an equivalent bandwidth of half x 12.5 kHz or 6.25 kHz. This is known as having an efficiency of one talk path per 6.25kHz of spectrum. However with DMR the channel as a whole maintains the same profile as an analogue 12.5kHz signal.

This means that DMR radios operate in the licence holders existing 12.5 kHz or 25 kHz channels; there is therefore no need for re-banding or re-licensing but at the channel capacity is doubled. Read More

Accelerating standards:
Validating interoperability

The official software suite developed by the DMR Association Technical Working Group (TWG) delivers standardised, automated protocol validation for DMR Tier III systems. Built for manufacturers, test labs, and engineers, the DMR Analyser Toolset provides a comprehensive framework to capture, decode, verify, and document full compliance with complete technical accuracy.

By replacing intensive manual reviews with automated PDU-to-template verification and instant colour-coded results, the suite significantly streamlines the certification lifecycle. Its vendor-agnostic architecture interfaces seamlessly across any infrastructure via standard IP/UDP connections, supporting end-to-end testing from live air-interface logging to offline playback analysis.

Ultimately, the toolset standardises laboratory data compilation directly into official Excel reporting for effortless submission and archival. Through automated verification and verified interoperability, we reduce certification effort while delivering the precision required for reliable multi-vendor deployments.

The DMR Analyser Toolset package and supporting documentation are available now to all Category 1 members. Log in to the member portal to download the release files and begin preparing for upcoming IOP test sessions. The tools are located under (TWG) Technical Working Group Documents > DMR Interoperability > IOP Tools Applications and Documentation.

Cat 1 Members Login >

Our members' mission is to deliver affordable, low-complexity digital systems. We are dedicated to optimizing these protocols and extending capabilities while reducing costs through a diverse ecosystem of compatible products.

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