Transport up to 4 full rate HD-SDI digital video signals in both directions at 1.5Gbps each over a single strand of fiber cable up to 80km long. In addition, dual Aux ports provide additional capacity by adding up to 4 analog bi-directional audios, 2 full duplex RS-232/422 links, or 4 contact closure lines per Aux interface. The transmitter inputs support any serial digital signal up to HD-SDI, including SD-SDI. The F-M8SDI platform delivers more functionality and performance over a single fiber than has ever been available in off the shelf equipment. Each of the 4 bi-directional HD-SDI signals are fully isolated from each other and operate at a full 1.5Gbps data rate. Each channel carries its own embedded audio and ancillary data and operates as if it were the only signal on the fiber. This is accomplished with CWDM technology.