Radio Technology


Manufacturers devices will conform to a "radio technology standard". TES can supply all brands and standards. Each has specific implications and must be considered carefully. At TES we choose technology first. Read more here:


DMR Tier I

Digital Mobile Radio (DMR) is the primary digital standard.

Tier I provides for consumer applications and low-power commercial applications, using a maximum of 0.5Watt RF power.

Tier I DMR devices are best suited for personal use, recreation, small retail and other settings that do not require wide area coverage or advanced features.


Tier II covers licensed conventional radio systems, mobiles and hand portables operating in PMR frequency bands from 66-960MHz.

The ETSI DMR Tier II standard is targeted at users who need spectral efficiency, advanced voice features and integrated IP data services in licensed bands for high-power communications.

ETSI DMR Tier II specifies two-slot TDMA in 12.5kHz channels.


Tier III covers trunking operation in frequency bands 66-960MHz.

The Tier III standard specifies two-slot TDMA in 12.5kHz channels.

Tier III supports voice and short messaging handling similar to MPT-1327 with built-in 128 character status messaging and short messaging with up to 288 bits of data in a variety of formats.

TES have the broadest experience in deploying tier III systems. Visit our dedicated site at


TETRA is a standard for digital Private Mobile Radio and Public Access Mobile Radio.

It offers many advantages including flexibility, security, ease of use and offers fast call set-up times.

It is aimed at a variety of mobile radio communications users including the police, ambulance and fire services, it is equally applicable for utilities, public access, fleet management, transport services, and many other users.


dPMR is an alternative standard for digital mobile communications.

It is an open, non-proprietary standard that was developed by the European Telecommunications Standards Institute.

It now has four main elements: 446 licence free application; back to back radio; radio with repeater; and trunking.

However, dPMR was initially designed as a peer-to-peer solution and is more often found being used in licence free application.


Analogue Radio

PMR was developed for business users and typically serves a closed user group and that is normally owned and operated by the same organization as its users.

PMR systems generally provide facilities for group call and press-to-talk, and have call set-up times which are generally short compared with cellular systems.

Traditionally, PMR systems have usually been based on European standards for the equipment, but operated under Ofcom licence.


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