Explain the telemetry latency budget.

• A. Budget for data storage capacity
• B. A collection of all delay sources from sensor to ground to ensure end-to-end latency meets requirements
• C. A fund allocated for firewall upgrades
• D. A schedule for maintenance windows

Answer: (B)

The latency budget is the total allowance for how long it takes for telemetry data to move from the sensor on the spacecraft (or platform) all the way to usable data on the ground, accounting for every delay along the path. It means adding up every source of delay—sensor data capture and processing time, onboard queueing and processing, spacecraft downlink transmission time, link propagation, ground station reception and processing, and any network or data handling delays—to ensure the end-to-end latency stays within the mission’s requirements. This helps engineers verify feasibility early in the design and identify bottlenecks so timely decisions, health monitoring, or real-time operations can be maintained. The other options don’t capture this end-to-end timing concept: data storage capacity is about space for data, firewall funds are unrelated to delay in the telemetry path, and maintenance windows schedule is about availability rather than the time delays in data delivery.