Radioddity has updated the DM-5R listing with this cryptic note about Tier II support:
“Support DMR repeater function (DMR Tier I; support Tier II if upgraded with less than $10)”
DMR Tier II & Tier III: what’s the difference?
Digital Mobile Radio (DMR) was originally developed as a direct replacement for analogue private mobile radio to provide cost-effective, low-complexity digital radio solutions for transport and utilities.
Offering digital audio quality, better spectral efficiency, improved data capability and enhanced portable battery life, DMR has now expanded its scope to include business-critical and commercial communications.
The DMR suite of standards is developed and managed by ETSI in conjunction with vendor members of the DMR Association, which also ensures multi-vendor interoperability and promotes the technology. The standards are defined in operational ‘tiers’:
Tier I specifies short range licence-free low power operation, mainly for personal or recreational use.
Tier II specifies conventional operation in licensed bands.
A licence from a national regulator allows radios to operate at a higher power, allowing them to transmit over longer distances, and in a dedicated part of the radio spectrum. Communication services may feature repeater networks, advanced call services, data services, telephone interconnect, dispatch connection and secure communications.
Tier III adds full digital trunking operation to Tier II capabilities, based upon the MPT1327 analogue trunking open standard, whereby radio channels that are available can be shared amongst users more efficiently.
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