The SD404A card is designed to receive up to four 75 Ohm AES signals and embed these into a serial digital video signal at its output.The SD404A provides four copies of the SDI signal with embedded audio at their outputs.

Input and output signal connections for the SD404A are made via 75 Ohm BNC connectors on the rear of the MF100 or MF104 Serialboxx frame.

The SD404A is designed to receive digital video signals transmitted over 75 Ohm coaxial cable (BELDEN 8281 or equivalent). An adaptive cable equalizer provides equalization for high-bit-rate digital data transmitted over a long transmission line. The SD404A can be installed in any position in the MF100 or MF104 Serialboxx frame.