... RS485 Data 3 Levels Lightning Proof, Dual Power Input, 32CH Video Digital Video Optical Transceiver 19" 2U Cabinet, Support Max. 80CH 232 ... /485/CAN cable, 64CH Audio, 64CH Switching Values, 32CH Telephone, 196 Connectors ... bi-directional transmission.6, RS232, RS485,RS422, etc Supportable Digital Video Optical Transceiver