Which statement correctly describes CPDLC messaging in relation to data link?

Which statement correctly describes CPDLC messaging in relation to data link?

• A. CPDLC messages are carried on VDL2 with higher throughput than voice.
• B. CPDLC uses satellite link only.
• C. CPDLC does not require a data link.
• D. CPDLC messages replace ADS-B.

Answer: (A)

CPDLC relies on air-ground data-link messaging to exchange text-style instructions and requests between the controller and the pilot. The typical path for CPDLC is VHF Data Link Mode 2 (VDL2), which provides a higher data rate than traditional voice channels. This higher throughput lets CPDLC messages be sent, received, and acknowledged more quickly, reducing reliance on voice and improving efficiency. Satellite links can support CPDLC in some configurations, but they are not the exclusive path; VDL2 over VHF is the common method in many regions. CPDLC requires a data link to function and does not replace ADS-B, which is a surveillance system. So, CPDLC messages carried on VDL2 with higher throughput than voice is the best description of its data-link relationship.

CPDLC relies on air-ground data-link messaging to exchange text-style instructions and requests between the controller and the pilot. The typical path for CPDLC is VHF Data Link Mode 2 (VDL2), which provides a higher data rate than traditional voice channels. This higher throughput lets CPDLC messages be sent, received, and acknowledged more quickly, reducing reliance on voice and improving efficiency. Satellite links can support CPDLC in some configurations, but they are not the exclusive path; VDL2 over VHF is the common method in many regions. CPDLC requires a data link to function and does not replace ADS-B, which is a surveillance system. So, CPDLC messages carried on VDL2 with higher throughput than voice is the best description of its data-link relationship.