Digital Mobile Radio (DMR) is a digital radio standard specified for professional mobile radio (PMR) users developed by the European Telecommunications Standards Institute (ETSI) and first ratified in 2005. Increasingly, Critical Communications agencies including Public Safety, Transportation, and Utility are deploying DMR radio systems in VHF, UHF, and 800 MHz.
The standard is designed to operate within the existing 12.5kHz channel spacing used in licensed land mobile frequency bands globally and to meet future regulatory requirements for 6.25kHz channel equivalence. The primary goal is to specify affordable digital systems with low complexity. DMR provides voice, data, and other supplementary services. Today, products designed to its specifications are sold in all regions of the world.
The DMR protocol covers unlicensed (Tier I), licensed conventional (Tier II), and licensed trunked (Tier III) modes of operation, although in practice commercial application today is focused on the Tier II and III licensed categories.
The standards that define DMR consist of four documents which can be downloaded free of charge from the ETSI website, as well as the console wireline interface standard, AIS.
Catalyst Communications Technologies is an active member of the DMR Association, which is a global organization focused on helping to make DMR the most widely supported 21st century digital radio standard. Many worldwide radio manufacturers have developed radio equipment to operate on the DMR standard, thus increasing competition and product availability.
DMR Application Interface Specification (AIS) – IP|AIS™
Catalyst provides a wireline (AIS) interface to DMR systems. We interface to AIS wireline infrastructure through a gateway that provides direct Ethernet interface to various radio manufacturers’ Tier III DMR trunked switch infrastructure via that manufacturer’s AIS gateway. Multiple simultaneous audio paths can be routed through the Catalyst AIS Gateway to provide a more robust solution compared to donor radio scanning.
Wireless Gateways connect to donor mobile radios that interface to DMR networks, including MOTOTRBO systems from Motorola. Often our EIA Tone Control – IP|Tone™, a Gateway for most Tone control base stations and repeaters, will be used to connect to these donor radios. Many manufacturers with serial controlled radios provide DMR standard mobile radios, (Kenwood, for example) and a variety of Catalyst gateways with advanced radio control can be used in these applications.
DMR Control Capabilities
All of the Catalyst Dispatch consoles (IP Console, Propulsion, and Desktop Dispatch) interface to DMR control stations and to the Wireline Interface, AIS. The following DMR radio features are available and vary by product:
- Instant Recall Recording
- Group Voice Call
- Individual Unit Call
- Channel Change
- Caller Alias Display (& Unit ID)
- Emergency Status
- All Call
- Call Alert
- Unit Disable
- Unit Enable
- Radio Check
- Radio Monitor
- Radio texting to & from dispatch console
- Free-form & Canned Text Messages
Catalyst has multiple customers using DMR radios with its products; for example, Wake Forest University uses a Catalyst console and DMR for primary dispatch. For a press release regarding the installation click here.