3G HD-SDI to HDMI converter. 3-Gbps (3G)-SDI, higher resolution (FHD) of picture quality required Serial Digital Interface (SDI) for 1080p. Display the Luma(Y), Chroma(Cb/Cr) and RGB Components of the input video signal as a form of waves. This model supports UMD (Under Monitor Display) function which displays Ancillary data at the foot of the screen.