... , all-digital video correction and Gigabit fiber optic transmission technology, Which support long distance and high quality transmission of 4-channel digital video, 4 ... , automatic temperature compensation circuit, automatic overload protection recovery4, ST/FC/SC type for option; 2KM (MMF)/ 20~120KM (SMF) for ... Ethernet, A: audio, S: switch value, P: telephone 4-ch fiber optic video converter