Which of the following is a correct list of common interfaces used by mission computers to connect with sensors and actuators?

Which of the following is a correct list of common interfaces used by mission computers to connect with sensors and actuators?

• A. CAN, SpaceWire, MIL-STD-1553, Ethernet, and digital I/O
• B. USB, HDMI, Bluetooth, NFC
• C. PCIe, SATA, SAS, Fibre Channel
• D. I2C, SPI, SMBus, 1-Wire

Answer: (A)

Common interfaces for mission computers to connect with sensors and actuators are those that deliver real-time, fault-tolerant communication across aerospace and space systems. The mix of CAN, SpaceWire, MIL-STD-1553, Ethernet, and digital I/O covers a broad range of needs: CAN provides robust field-bus communication with priority-based arbitration for distributed devices; SpaceWire offers high-speed, low-latency interconnections designed for spacecraft networks; MIL-STD-1553 delivers a highly reliable, redundant data bus suited for mission-critical subsystems; Ethernet brings scalable high-bandwidth networking; and digital I/O handles straightforward binary signaling for simple devices. This combination reflects the practical, heavy-duty ecosystem used to reliably connect many sensors and actuators in challenging environments. Consumer interfaces like USB, HDMI, Bluetooth, and NFC aren’t typical for mission-critical sensor/actuator networks due to their lack of deterministic timing, ruggedness, and failure-handling characteristics. Storage-focused interfaces such as PCIe, SATA, SAS, and Fibre Channel are mainly about data storage or enterprise interconnects rather than real-time control networks. Simple peripheral buses like I2C, SPI, SMBus, and 1-Wire are common on individual boards but don’t scale well across multiple nodes or meet the fault-tolerance requirements of a full mission computer network.

Common interfaces for mission computers to connect with sensors and actuators are those that deliver real-time, fault-tolerant communication across aerospace and space systems. The mix of CAN, SpaceWire, MIL-STD-1553, Ethernet, and digital I/O covers a broad range of needs: CAN provides robust field-bus communication with priority-based arbitration for distributed devices; SpaceWire offers high-speed, low-latency interconnections designed for spacecraft networks; MIL-STD-1553 delivers a highly reliable, redundant data bus suited for mission-critical subsystems; Ethernet brings scalable high-bandwidth networking; and digital I/O handles straightforward binary signaling for simple devices. This combination reflects the practical, heavy-duty ecosystem used to reliably connect many sensors and actuators in challenging environments.

Consumer interfaces like USB, HDMI, Bluetooth, and NFC aren’t typical for mission-critical sensor/actuator networks due to their lack of deterministic timing, ruggedness, and failure-handling characteristics. Storage-focused interfaces such as PCIe, SATA, SAS, and Fibre Channel are mainly about data storage or enterprise interconnects rather than real-time control networks. Simple peripheral buses like I2C, SPI, SMBus, and 1-Wire are common on individual boards but don’t scale well across multiple nodes or meet the fault-tolerance requirements of a full mission computer network.