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MDI stands for Microsoft Document Imaging format. This TIFF-based file format is designed to store images by page layout using Office Document Imaging, which can save files as MDIs and TIFFs. TIFF files are widely compatible, but MDI files only open with Office Document Imaging, which can be a problem when you have to share MDI files. The best solution is to save them as TIFFs to begin with, but that's not much help if you're the one trying to open MDI files without Office. MDI Viewer by HAN Software opens and displays MDI and TIFF images without having Office, Adobe Acrobat, or any other big-bucks, big-box wares.
MDIX is a version of the medium dependent interface (MDI), which is a module of the media attachment unit (MAU). The MAU is a transceiver converting signals on an Ethernet cable for which it transmits and receives attachment unit interface (AUI) signals. The standard for the MDIX is the MDI standard.