About SDI Series
Serial digital interface (SDI) is a standard for digital video and audio transmission over coaxial or fiber optic cabling.
SD-SDI:
The SD-SDI signal cables offer a transmission speed up to 270Mb/s, and can be used for resolutions up to 480i (720×480)and 576i(720×576).
HD-SDI:
The HD-SDI signal cables offer a transmission speed up to 1.485 Gb/s and can be used for resolutions up to 720p and 1080i.
3G-SDI:
The 3G-SDI signal cables offer a transmission speed up to 2.97 Gb/s and can be used for resolutions up to 1080p at 60 frames per second.
Why SDI
SDI is often found in professional environments used by broadcast picture and sound engineers.
SDI equipment is more expensive to purchase and use compared to HDMI. But it does enable far greater transmission, which can reach up to 100 feet for coax cabling and 1,000 feet over optical fiber.
Although HDMI can technically transmit higher-fidelity video signals, SDI is still used by professionals because the corresponding video equipment interfaces natively use the SDI standards.