You are provided with a comparison of the properties of conventional analogue and new digital PMR systems to help support the decision to introduce a new radio communication system.
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This resource features discussions on critical topics, such as transmitter switching spectrum, real Doppler situations and real usable frequency economy. It also discusses alternatives to PMR, such as public cellular systems, and concludes with a look at the future of PMR through the year Chapter 2 Alternatives to PMR Chapter 5 Fundamentals of Digital Modulation and Coding Acronyms and Abbreviations About the Author DMR Tier 2 Conventional : Tier 2 II covers conventional radio systems, mobiles and hand portables where a dedicated radio channel is allocated to each individual group of users.
Introduction to Digital Professional Mobile Radio
Products operate with high power levels enabling a greater range, which can be further extended with the use of base stations or repeaters to provide a wider coverage area. Tier 3 III trunking operations utilise a control channel to dynamically allocate a pool of radio channels to many different groups of users as required.
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Tier 3 systems are generally used for large networks to provide the equivalent of a small-scale mobile telephone network. They usually require a controller to manage communications including simulcast and multicast.
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It provides short messaging services with up to bits of data in a variety of formats. It also supports packet data service in a variety of formats, including support for IPv4 and IPv6.
Tier 3 networks can also be tied in to public switched telephone networks PSTN or other telephony systems. Interoperability testing of vendor products is overseen by the DMR Association, which was set up in However, the standard does allow manufacturers to introduce additional features on top of the basic specifications developed by ETSI.
It should be noted that DMR is very much a living standard, which continues to be developed and refined with new features and functionalities being added all the time.
The development of the DMR Application Interface Specification AIS protocol is designed to make it much easier to develop third party applications that can work across different vendor equipment, thereby promoting greater interoperability.