Advanced Mezzanine Cards are printed circuit boards (PCBs) that follow a specification of the PCI Industrial Computers Manufacturers Group (PICMG).
Each height is paired with a width, single or double, describing how many carrier slots the board fills.
A double width card allows more component space, but does not provide any additional power or bandwidth because it only uses a single connector.
The pinout of the AMC electrical connector on an ATCA-AMC carrier or motherboard is fairly complex, with up to 170 signal traces.
Since this approval, companies like Advantech, Kontron, N.A.T., Annapolis Micro Systems, VadaTech Inc., have launched AMC and MCH products.