... data, ethernet, audio, switch value for option The product adopts the international advanced uncompressed, all-digital video correction and Gigabit fiber optic transmission technology ... +5Data+Ethernet+4two-wayAduio+2two-way switch value+ TelephoneRemarkV: Video, D: Data, E: Ethernet, A: audio, S: switch value, P: telephone 4-ch fiber optic video ...