In satellite communications, which path carries signals from the ground station to the satellite?

• A. Downlink
• B. Latency
• C. Uplink
• D. Propagation delay

Answer: (C)

Signals traveling from a ground station to a satellite use the uplink path. The term uplink captures the upward direction toward space, which is exactly the path from Earth to the satellite. The opposite direction, from the satellite down to the ground, is called the downlink. Latency refers to the overall time delay of the communication, not a specific path, and propagation delay is the time required for the signal to traverse the physical distance, again a delay attribute rather than a direction. So for a ground-to-satellite transmission, the upward path is the uplink.