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 desktop computer. It is designed to interface with special Ethernet (EDC), modem (MDC) or bluetooth (BDC) cards.
Intel MDC specification 1.0 In 1999, Intel published a specification for mobile audio/modem daughter cards. The document defines a standard connector (AMP* 3-179397-0), 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:
45 × 27 mm 45 × 37 mm 55 × 27 mm with RJ11 jack 55 × 37 mm with RJ11 jack 45 × 55 mm 45 × 70 mm
30-pin AMP* 3-179397-0 pinout
See also Daughter board
External links intel.com – MDC specification.pdf