DMR (Digital Mobile Radio) trunking is a type of digital radio communication technology used in professional mobile radio (PMR) systems. DMR trunking is based on the DMR Tier III standard, which is an international digital radio standard that was developed by the European Telecommunications Standards Institute (ETSI). It is designed to provide efficient and flexible communication services to users in a variety of industries, including public safety, transportation, utilities, and more.

DMR trunking operates by using time slots to transmit multiple user conversations over a single frequency channel, which enables many users to share a single radio frequency without interfering with each other. This makes it a cost-effective alternative to traditional analog trunking systems.

Additionally, DMR trunking provides improved voice quality, increased security through the use of encryption, and better call management features, including group and individual calling, as well as emergency calling.

Overall, DMR trunking is a reliable and efficient solution for organizations that need to communicate efficiently and securely.

What is the term for single site DMR trunking?

The term for single site DMR trunking is typically referred to as a "Single Site DMR System" or a "Single Site Trunked Radio System." This refers to a DMR trunking system that operates within a single geographic location or site, where all of the radios and base stations are connected to the same network and use the same frequency channels.

Single site DMR trunking is often used in smaller organizations or businesses that need to communicate within a limited area, such as a single campus, building, or factory. These systems are relatively simple to install and operate, and provide reliable communication for users within the defined coverage area.

How DMR trunking works?

DMR trunking works by using time-division multiplexing (TDM) to transmit multiple user conversations over a single frequency channel. This allows many users to share a single radio frequency without interfering with each other.

Here's how DMR trunking works:

A user presses the push-to-talk (PTT) button on their radio to initiate a transmission.

The radio sends a request to the base station, which acts as a control channel, to allocate a time slot for the transmission.

The base station assigns a specific time slot for the transmission and sends this information back to the radio.

During the assigned time slot, the radio transmits its audio over the airwaves, and the base station forwards the audio to the network, which routes it to the intended recipient(s).

The recipient's radio receives the audio during the assigned time slot, and the user hears the transmission.

This process is repeated for each subsequent transmission, with different time slots being assigned for each conversation. In this way, multiple users can transmit and receive audio simultaneously over a single frequency channel, without interfering with each other.