... Data 3 Levels Lightning Proof, Dual Power Input, 32CH Video Digital Video Optical Transceiver 19" 2U Cabinet, Support Max. 80CH 232 ... . Enhanced Functions. Remarks: 1, Every unit includes a transmitter, a receiver and related accessories. Pls note following: 2, Power adaptors included ... fiber bi-directional transmission.6, RS232, RS485,RS422, etc Supportable Digital Video Optical Transceiver