The AIM (Airborne Instrumentation Multiplexer)-400X-1 performs high-speed data multiplexing. It has a single backplane PCB (Printed Circuit Board) that has two separate bus segments. This allows an OVH-350-1 overhead module, an RCI-305-2 or -3 CAIS interface and an additional Input/Output (IO) board to be installed on each of two backplane segments. Each bus segment supports 64-bit PCI at 66.67 MHz (533 MBps peak bandwidth) and accepts an I/O board for data multiplexing and recording. Each backplane bus segment is independent, which allows the AIM-400X-1 to act as two multiplexers in one physical chassis. The AIM-400X-1 accepts IRIG-B AC or DC time to support IRIG Chapter 4 for selected data over the CAIS bus. Each segment of the AIM-400X-1 can also operate as a CAIS remote data acquisition unit. This allows selected data from I/O boards, unit status and recorder status to be provided to the CAIS controller as flight safety data.

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