... copyright IC;No interference between analog in adjusting channel, picture and range;4 steps filtering;Completely digital, broadcast transmition efficiently ... 100 km, WDM availableAudio interface: supports 1 line optional and bidirectional audioAudio input/output: impedance 600 balance/unbalance interface industry ... 24V+12,+5V optional power 5W (single terminal) Digital Video Transmitter and Receiver