XMC Switched Mezzanine Cards, as defined in the ANSI/VITA 42.0, provide high-speed switched fabric interconnect to a standard PMC form factor. These boards are a flexible way of adding I/O capability to a system via XMC Carriers, or via processor cards with one or more XMC sites. This provides I/O expansion to standard form factors such as OpenVPX, AdvancedTCA and MicroTCA, with air-cooled and conduction-cooled variants being available.