... Data 3 Levels Lightning Proof, Dual Power Input, 32CH Video Digital Video Optical Transceiver 19" 2U Cabinet, Support Max. 80CH 232 ... , 220V AC default. Pls notify if you need different power supply;3, OEM accepted if you need special design;4, Transmission distance ... fiber bi-directional transmission.6, RS232, RS485,RS422, etc Supportable Digital Video Optical Transceiver