As an ATCO, what is DLS and how does it relate to CPDLC?

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    DLS is the broader framework of services and applications in the domain of aeronautical air-to-ground data communications. CPDLC is one such application, it enables the controller to issue instructions (such as transfers, frequency changes) and clearances (such as speeds, headings, direct-to, descend-to) by way of a text message implemented between the ATC and aircraft terminals. Another such application is ADS-C, anticipated for implementation in 2025. ADS-C is intended for system to system data exchange between the aircraft FMS and the ATC FDP.

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