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A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a talkgroup) with mobile and portable two-way radios communicate over a single shared radio channel, with one user at a time ...
Each PassPort Trunked radio site has 3 important channels: A "Home" channel that carries voice traffic for units that are homed at this site. A "Group" channel that carries voice traffic for units that are roaming to this site. A "Collect" channel that is used by roaming units to register with the site.
MPT 1327 [1] is an industry standard for trunked radio communications networks.. First published in January 1988 by the British Radiocommunications Agency, and is primarily used in the United Kingdom, Europe, South Africa, Australia, New Zealand and China.
911: Operation started in 2014 in Santo Domingo, with expansions in 2015. In 2016, TETRA trunking radio expanded to Haina and San Cristobal, cities in the southwest of Santo Domingo. In 2017, the service expansion of 911 services using TETRA expanded to the north of the country, to cover large cities as Santiago, Puerto Plata and small villages.
LTR MultiNet Systems are APCO-16 compliant LTR Trunked Radio Systems and thus are mostly found in use as public safety systems. LTR MultiNet systems usually have one or more "status channels" that act like a control channel in a Motorola or EDACS system, however these channels can also carry voice transmissions simultaneously.
Within radio technology, LTR (Logic Trunked Radio) Standard systems have no dedicated control channel. All control data is sent as subaudible data along with voice transmissions. Each system site can have any number of radio channels from 1 through a maximum of 20.
The cashier represents each radio channel, and each customer represents a radio user transmitting on their radio. Trunked radio systems (TRS) pool all of the cashiers (channels) into one group and use a store manager (site controller) that assigns incoming shoppers to free cashiers as determined by the store's policies (TRS protocols).
Most trunked radio systems follow the MPT1327 format. To implement trunked PMR a network of stations is set up. These stations are linked generally using land lines, although optical fibers and point to point radio are also used. In this way the different base stations are able to communicate with each other.