Mobile daughter card


The mobile daughter card, also known as an MDC or CDC, is a notebook version of the AMR slot on the motherboard of a desktop computer. It is designed to interface with special Ethernet, modem or bluetooth cards.

Intel MDC specification 1.0

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:
  • 45 × 27 mm
  • 45 × 37 mm
  • 55 × 27 mm with RJ11 jack
  • 55 × 37 mm with RJ11 jack
  • 45 × 55 mm
  • 45 × 70 mm