RME AOX-MADI-EXT-BNC Expansion CardDesigned as an expansion board that fits over the I O connectors of the RME HDSPe AoX M 512 channel PCIe audio interface card, the AoX MADI EXT BNC is an expansion board that replaces the HDSPe AoX's RJ45 MADI ports with four BNC connectors. These BNC jacks can distribute up to 128 channels of MADI I O at 48 kHz. Along with the four BNC MADI connectors, this expansion board also provides a single BNC word clock jack for sync functionality. About MADI