What type of system utilizes digital technology to transmit over shared frequencies controlled by a computer?

A trunking system is a communications approach that effectively maximizes the use of available frequencies by allowing multiple conversations to occur over shared frequencies. This system is particularly beneficial in environments where the demand for communication can vary greatly, such as in emergency services.

The digital technology employed in a trunking system enables the automatic assignment of communication channels to users based on need, as managed by a central computer system. This intelligent allocation means that when a user requests access to transmit, the system can quickly assign them a free channel from a pool of shared frequencies. This capability significantly enhances efficiency and reduces congestion, allowing for more effective communication within organizations like fire departments and other emergency services.

In comparison, a repeater system primarily serves to extend the range of communication by receiving and retransmitting signals, while a duplex channel allows for simultaneous two-way communication but does not inherently manage frequency use dynamically. Computer-aided dispatch refers to the technology that helps in coordinating and managing emergency response but is not focused on channel allocation or frequency management.