The function of the ATCA carrier board and of the ATCA shelf manager are concentrated on one board, which is called the MicroTCA Carrier Hub (MCH). On July 6, 2006, MicroTCA R1.0 was approved.
On July 6, 2006, MicroTCA R1.0 was authorized. The functions of both the ATCA carrier board and shelf manager were consolidated onto a single board called the MicroTCA Carrier Hub (MCH).