... 4.RS232, RS422,RS485 Fiber Optical TransmitterSpecification:HSGQ Video/Audio/Data Digital Opitcal Transceiver adopts the most advanced technology in ... are improted from most advanced foreign country.All the optical interfaces and electrical interfaces meet the international standards ,being ... pattern 5.with the APC electric circuit, the output optical power to be constant, the dynamirange is wide6.LED ...