DMR Tier III Trunking
Everything you want to know about DMR Tier III is here
What are DMR Tiers?
The DMR standard was developed by the European Telecommunications Standards Institute (ETSI) in 2012 and has now become a globally developed standard for digital communications. DMR has three definition layers, namely DMR Tier I, II, and III. Users can choose different layers of equipment according to their different needs for digital communication systems.
What are DMR Tier I, Tier II and Tier III？
Tier I: Unlicensed
Tier I refers to working under the frequency 446.1-446.2MHz, no license is required for use, such as PMR446 walkie-talkie. Its communication service is very basic, no repeaters are used, no telephone interconnection, and it also defines a maximum power of less than 0.5 W per radio transmission, low power, mainly for personal or recreational users.
Tier II: Conventional
Tier II is a conventional radio system operating in the 30-1000MHz band, usually VHF in the 136-174MHz band and UHF in the 350-527MHz band, requiring a license. Its communication service is much more complex than Tier I, including advanced call service, telephone interconnection, dispatch connection and secure communication. The power is higher and the communication range is wide. For example, the maximum power of Hytera's best-selling radio is usually 5 W. It is also possible to extend the communication range even further through a network of repeaters or IP data services.
Tier III: Trunking
Tier III is based on the MPT1327 analog cluster open standard and adds a complete digital cluster function on the basis of Tier II. DMR Tier III is a trunked radio system, which means that radios are automatically assigned to frequencies rather than having a fixed frequency, allowing for more efficient sharing of available radio channels among users. Tier III is designed for large networks with thousands of users.
DMR Tier III Features
DMR Tier III is a trunked radio system that allows you to use fewer frequencies while maintaining the same number of calls, reducing license costs. The automatic allocation of frequencies prevents two groups from interfering with each other by communicating on the same channel.
DMR Tier III provides better audio quality and a wider range of advanced voice and data applications. It also supports the simultaneous transmission of multiple smart voice and data applications, as well as other advanced features and more. In terms of voice, DMR Tier III supports individual calls, group calls, all calls, emergency calls PSTN/PABX calls, half-duplex calls, and full-duplex calls.
DMR Tier III also has data services such as radio text and status messages (SMS), location (GPS) services, and data applications such as packet data transfer services in IPv4 and IPv6 formats. DMR Tier III can be used in a variety of other applications such as SCADA, remote monitoring and control telemetry, automation and alarming, etc.
DMR TIER III coverage has similar RF characteristics to analog or MPT1327 radios. Factors affecting signal coverage include delay spread and its effect on DMR's 4FSK modulation, which defines the maximum allowable signal loss between a DMR transmitter and receiver before communication fails. In actual devices, however, there are other factors that affect the coverage of the DMR TIER III. For example, DMR terminal equipment has good receiver sensitivity, then DMR TIER III equipment can tolerate relatively high signal loss.
Benefits of Hytera DMR Trunking
Increased Efficiency
The trunking system allocates channels through dynamic management, which improves the efficiency of channel usage. And DMR provides two communication slots in one 12.5KHz channel. Therefore, combining the efficiency of trunking technology with the advantages of DMR can result in an efficient PMR solution.
System High Reliability
Hytera DMR Trunking system combines optimal radio coverage with an intelligent redundant design, thus ensuring overall system availability even if individual components fail. The solution provides high availability backup, while multiple levels of fallback options can be deployed to ensure high reliability.
Easy to Interconnect with Other Systems
The system can be connected to Hytera DWS Dispatcher solutions, PSTN/IP-PBX systems and Hytera SmartOne unified communications platform, allowing interconnection between legacy DMR Tier II, Analogue, MPT, TETRA and LTE systems. Hytera is also able to offer a range of mobile or portable radios that are compatible with this Tier III feature.
Powerful Application
The network management software as well as the scheduler and recording system ensure that the DMR Trunking is a comprehensive, professional solution that provides central management of the radio system and supports remote maintenance.
Lower Cost of Migration
DMR Tier III provides a direct digital alternative to analog MPT1327 trunking networks and is a more economical solution than other digital trunking standards such as TETRA and P25.
Open API
Open API allows further development according to different customer needs, such as billing systems, email gateways, etc.
Hytera DMR Tier III Trunking Systems
Hytera DMR Tier III Trunking Solution has been world widely used in public safety and all vertical industries including Electricity, Oil & Gas, Transportation, etc. It can serve the customer with small to large coverage, expandable capacity, high reliability and enhanced security. As per the customer's detailed requirements, such as daily communication, integrated command and control, dispatching and rapid positioning, tailored solutions can be provided due to Hytera's rich product portfolio and abundant system features and functions.