MicroTCA is an open standard embedded computing specification created by PICMG. First ratified in 2006, the specification utilizes the existing Advanced Mezzanine Card (AMCs) in a hot-swappable backplane format. It features MicroTCA Carrier Hubs (MCHs) which provide IPMI-based shelf management and switching functionality to the system. MicroTCA systems provide up to 99.9999% uptime in a smaller form factor than 3U and 6U Eurocard systems. A typical mid-sized 4HP AMC is 73.8mm x 18.96mm x 181.5mm. There are also compact-sized AMCs at 3HP wide (13.88mm) and full-sized at 6HP wide (28.95mm). Double modules have also been created, extending the height of the modules from 73.8mm to 148.8mm. The architecture was originally designed for telecom applications, but MicroTCA has gained significant po