The Mobile Daughter Card, also known as an MDC or CDC (Communications Daughter Card), is a notebook version of the AMR slot on the motherboard of a notebook computer. It is designed to interface with special ethernet (EDC), modem (MDC) or bluetooth (BDC) cards.
In 1999 Intel published a specification for Mobile Audio/Modem daughter cards. The document defines a standard connector, mechanical elements including several form factors, and electrical interface. The 30-pin connector carries power, several audio channels and AC-Link serial data. Up to two AC'97 codecs are supported on such a card.
Several form factors are specified: