PCIe and PXIe are both open-standards for expansion and I/O cards, both enabling the end user of the system to configure the desired I/O to suit their needs. The problem is that the two cards are not space-compatible, requiring systems manufacturers to create two separate product to address both markets. This article discloses a means that allows for a flexible architecture that can accept either a PCIe bay or a PXIe bay, thus enabling both types of I/O, PCIe and PXIe, to be supported in a common-design, and in this example, a system that can be mounted in a standard 19” rack that consumes only 1U of rack space.
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Conn, Kevin; White Jr., Harvey Edward; Doehring-Patel, Victoria Jeanine; and Solanki, Prashant A., "1U Chassis Accepts PCIe or PXIe Cards", Technical Disclosure Commons, (March 29, 2017)