The Mobile Daughter Card, also known as an MDC or CDC (Communications Daughter Card), is a notebook version of the AMR

Audio/modem riser

The audio/modem riser, also known as an AMR slot, is a riser expansion slot found on the motherboards of some Pentium III, Pentium 4, Duron, and Athlon personal computers...

 slot on the motherboard

Motherboard

In personal computers, a motherboard is the central printed circuit board in many modern computers and holds many of the crucial components of the system, providing connectors for other peripherals. The motherboard is sometimes alternatively known as the mainboard, system board, or, on Apple...

 of a notebook computer. It is designed to interface with special ethernet

Ethernet

Ethernet is a family of computer networking technologies for local area networks commercially introduced in 1980. Standardized in IEEE 802.3, Ethernet has largely replaced competing wired LAN technologies....

 (EDC), modem

Modem

A modem is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the original digital data...

 (MDC) or bluetooth

Bluetooth

Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances from fixed and mobile devices, creating personal area networks with high levels of security...

 (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, 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:

• 45x27mm
• 45x37mm
• 55x27mm with RJ11 jack
• 55x37mm with RJ11 jack
• 45x55mm
• 45x70mm

External links

• intel.com - MDC specification.pdf