... transmission of 4-channel digital video, 4 two-way audio, 2 two-way switch value, 5-channel 485 data, Ethernet, ... mediation, automatic temperature compensation circuit, automatic overload protection recovery4, ST/FC/SC type for option; 2KM (MMF)/ 20~120KM (SMF) for ... -1E-4A4a-2S2s-1P4-channelvideo+5Data+Ethernet+4two-wayAduio+2two-way switch value+ TelephoneRemarkV: Video, D: Data, E: Ethernet, A: ...