MX-3GSDI-IB accepts SD-SDI, HD-SDI and 3G-SDI video signals with embedded audio on BNC connectors, supporting Level A and Level B Dual Link (B-DL), but Level B DualStream (B-DS) is not supported. Each channel also incorporates an SDI/HD-SDI/3G-SDI to HDMI/DVI conversion for further switching and processing in the router frame. SDI input signals are automatically equalized and reclocked. 

The card has an additional RCAPhono digital audio input connector accepting AES/EBU or S/PDIF digital audio per channel. Both Stereo PCM and 5.1 AC3 encoded formats are supported and are embedded into the video stream. Each input port contains a mini 16x8 channel audio crosspoint which allows de-embedding of up to 16 PCM audio channels from the SDI signal, switching and re-embedding up to eight audio channels into the HDMI stream. Either SDI audio or S/PDIF audio can be embedded, however, converting or mixing them is not possible. The SDI video pixel resolution and scan mode are maintained in the HDMI signal, while YUV ro RGB and colour range settings are also supported.