Digital Mobile Radio (DMR) is an open digital radio standard produced by European Telecommunication Standards Institute (ETSI). Being capable of voice, data and a range of other features and applications in conventional and trunking mode, DMR has received global recognitions.
As a premium member of DMR Association, Hytera has mastered this technology. All our DMR products fully meet ETSI DMR requirements and feature innovative applications.
We are cordially invite you to visit our DMR micro site Dmr.hytera.com to know more about DMR technology, product, solution as well as its performance in the industry.
The Advantages of DMR Technology
Superior audio performance
DMR Digital technology provides better noise rejection and preserves voice quality over a greater range than analog, especially at the farthest edges of the transmission range based on the combined efforts of narrowband codec and digital error-correction technology. The digital processing is able to screen out noise and re-construct signals from degraded transmissions. Users can hear everything being said much more clearly, thus increasing the effective range of the radio and keeping users responsive to dynamic situations in the field.
Doubling capacity in your existing 12.5 kHz licensed channels
One of the main benefits of DMR is that it enables a single 12.5 kHz channel to support two simultaneous and independent calls.
How this is achieved?
Under the DMR standard, Time Division Multiple Access (TDMA) retains the 12.5 kHz channel spacing and divides it into two alternating time slots. Each time slot acts as a separate communication channel with an equivalent bandwidth of 6.25 kHz, but the channel as a whole, maintains the same profile as an analog 12.5 kHz signal.
This means that DMR will fit into your existing licensed PMR bands so there is no need for re-banding or re-licensing simultaneously doubling the capacity of your 12.5 kHz channel.
While the voice channel is utilizing the first time slot, the second time slot, in a TDMA system, is used for transmitting application data such as text messaging or location data in parallel with call activity. This is useful in dispatch systems that provide both verbal and visual dispatch instructions. In an increasingly data rich world, this enhanced data capability will become important. The future roadmap for two slot TDMA applications will include the ability to temporarily combine both slots to effectively double the data rate, or to use both slots together to enable full-duplex private calls.