Mezzanine are board standards for single board computers( SBC) and computer modules( CoM). These boards have long been used as carrier boards. I/O modules can be plugged onto them.
Since most Computer-on-Modules work with the powerful PCI bus or PCI Express, an enormously high data transfer rate and low latency between the central processing unit( CPU), the working memory and the input/output is achieved with corresponding I/O modules that are plugged directly onto the carrier board. The mezzanine standard knows different module techniques and interfaces like the IP module, M module, PMC module and PC-MIP.