FO series digital video fiber optic transmission system can transmit 16 2970Mbps 3G-SDI high definition digital video, or 16 channels 1485Mbps HD-SDI high definition digital videos, or 16 270Mbps SDI standard definition digital videos or 16 DVB-ASI stream channels through one singlemode or multimode fiber with the standards of SMPTE424M, SMPTE292M, SMPTE259M, SMPTE297M, SMPTE305M, SMPTE310M. Each system consists of a transmitter and a receiver. When 3G/HD/SD-SDI signal inputs can automatically detect the video signal and lock it automatically to its speed, There is a loop-through connection for each channel for local monitoring at transmitter or receiver side.