What type of datalink allows for simultaneous two-way communication?

Duplex datalinks are designed to facilitate simultaneous two-way communication, meaning that both the transmitting and receiving parties can send and receive information at the same time without waiting for one to finish before the other starts. This type of communication is essential in environments where real-time interaction is crucial, such as in unmanned aerial systems (sUAS) operations.

In a duplex system, the channels for sending and receiving data are handled independently, enabling fluid communication and rapid response times, which enhances operational efficiency and safety in drone operations.

While simplex only allows communication in one direction at a time, and half-duplex allows for two-way communication but only one direction at a time, the duplex system's ability to manage both directions simultaneously greatly improves performance in scenarios where timely exchanges of information are vital. The option of multi-channel refers to the ability to operate on multiple frequency channels but does not inherently indicate simultaneous communication in both directions like a duplex system does.