What best describes the role of a cross-checking controller in a redundant mission computer?

What best describes the role of a cross-checking controller in a redundant mission computer?

• A. It compares outputs or checksums of redundant channels and initiates failover on mismatch.
• B. It schedules tasks to ensure deterministic timing.
• C. It analyzes data patterns for optimization.
• D. It monitors sensors for faults but does not perform failover.

Answer: (D)

In a redundant mission computer, the cross-checking controller acts as the safeguard that keeps multiple processing channels in agreement. It constantly compares the outputs (or integrity checks like checksums) from the redundant channels. When it detects a mismatch, it triggers a safe failover so the healthy channel takes over, ensuring continuous operation and data integrity. Other roles like scheduling tasks for deterministic timing, analyzing data patterns for optimization, or only monitoring sensors without initiating a switch don’t capture this core function. Therefore, the description that emphasizes comparing redundant outputs and initiating failover on disagreement best describes the cross-checking controller.

In a redundant mission computer, the cross-checking controller acts as the safeguard that keeps multiple processing channels in agreement. It constantly compares the outputs (or integrity checks like checksums) from the redundant channels. When it detects a mismatch, it triggers a safe failover so the healthy channel takes over, ensuring continuous operation and data integrity.

Other roles like scheduling tasks for deterministic timing, analyzing data patterns for optimization, or only monitoring sensors without initiating a switch don’t capture this core function. Therefore, the description that emphasizes comparing redundant outputs and initiating failover on disagreement best describes the cross-checking controller.