At present, there are single channel desktop computers, the transmitter supports 12g-sdi loop out, and the receiver has two channels of 12g-sdi signal output; In addition, four channels of 12g-sdi can be selected to transmit 40km through 1-core optical fiber, with 1U chassis structure and 220VAC dual power supply; also8-channel 12g-sdi transmits 40km through 1-core optical fiber;