Which of the following lists represents common interconnects used by mission computers to share resources?

Which of the following lists represents common interconnects used by mission computers to share resources?

• A. SpaceWire, MIL-STD-1553, CAN, Ethernet
• B. USB, HDMI, VGA, Bluetooth
• C. PCIe, SATA, SAS, Fibre Channel
• D. I2C, SPI, SMBus, 1-Wire

Answer: (A)

The idea being tested is which interconnects are commonly used by mission computers to share resources across subsystems. SpaceWire provides high-speed, spacecraft-optimized networking with built-in fault detection and radiation tolerance, making it a standard for linking processors and instruments on a spacecraft. MIL-STD-1553 is a rugged, deterministic bus designed for reliable multipoint communication in avionics and space environments, ensuring timely, predictable data exchange. CAN offers a robust, simple real-time network for control subsystems with strong fault containment, useful for interconnecting onboard components. Ethernet adds scalable, standard networking to share data and commands over IP across the vehicle or spacecraft. Together, these four cover space-qualified interconnects (SpaceWire and MIL-STD-1553), a robust control bus (CAN), and a general-purpose network (Ethernet) that are commonly used for resource sharing in mission computers. Consumer-oriented interfaces (USB, HDMI, VGA, Bluetooth) aren’t designed for deterministic, space-grade resource sharing. Storage-focused buses (PCIe, SATA, SAS, Fibre Channel) serve high-speed data transfer within or to storage systems, not broad onboard resource sharing across subsystems. Tiny, low-speed on-board buses (I2C, SPI, SMBus, 1-Wire) handle peripherals rather than coordinating multiple subsystems.

The idea being tested is which interconnects are commonly used by mission computers to share resources across subsystems. SpaceWire provides high-speed, spacecraft-optimized networking with built-in fault detection and radiation tolerance, making it a standard for linking processors and instruments on a spacecraft. MIL-STD-1553 is a rugged, deterministic bus designed for reliable multipoint communication in avionics and space environments, ensuring timely, predictable data exchange. CAN offers a robust, simple real-time network for control subsystems with strong fault containment, useful for interconnecting onboard components. Ethernet adds scalable, standard networking to share data and commands over IP across the vehicle or spacecraft. Together, these four cover space-qualified interconnects (SpaceWire and MIL-STD-1553), a robust control bus (CAN), and a general-purpose network (Ethernet) that are commonly used for resource sharing in mission computers.

Consumer-oriented interfaces (USB, HDMI, VGA, Bluetooth) aren’t designed for deterministic, space-grade resource sharing. Storage-focused buses (PCIe, SATA, SAS, Fibre Channel) serve high-speed data transfer within or to storage systems, not broad onboard resource sharing across subsystems. Tiny, low-speed on-board buses (I2C, SPI, SMBus, 1-Wire) handle peripherals rather than coordinating multiple subsystems.