Is there any
advantage of using HD-SDI interface instead of others?

Yes,
HD-SDI can be used
for live video. We are having more and more requests from users saying they
need multi-display for live instruction purpose, such as culinary school, food
channels and live broadcasting. 

HD-SDI uses no
video compression technology to transmit lossless video to viewers such as; User
groups of graphic designers, architect cad users and studio practitioners.

HD-SDI does not embed
any protocols into the signal transmission such as HDCP, so. HD-SDI

provides you with instant, vivid high quality video that other formats cannot.