Reading Time: 6 minutesWhat is SDI? Definition & Meaning SDI stands for ‘Serial Digital Interface’ and is a category of digital video interface standards for SDI transferring video, audio, timecode, and metadata in a 75-ohm coaxial cable with BNC connectors. The speed defines each SDI standard. It transports data. For example, a 3G-SDI (3 Gbit/s) can transport 1080p video at… Continue reading What Is SDI In A Video Camera? SDI vs HDMI Explained.