Fiber video converter Support 4-ch video With data, ethernet, audio, switch value for option ... support long distance and high quality transmission of 4-channel digital video, 4 two-way audio, 2 two-way switch value ... + Ethernet OAV-4V-D5-1E-4A4a-2S2s 4-channel video+5Data+Ethernet+4 two-way Audio+ 2 two-way Switch ... , E: Ethernet, A: audio, S: switch value, P: telephone 4-ch fiber optic video converter