Transponder SFP+ (Optical Repeater) Transponder addition to photoelectric conversion function, but also integrates a lot of signal processing functions, such as: MUX / DEMUX, CDR, function controls, sexual energy acquisition and supervisory control functions. Common Transponder are: 200/300pin, XENPAK Transceiver, and X2/XPAK and so on.echnical stuff really gives us a hard time understanding what they are. Though most of us are not technician, we still want to understand the latest trends of our time. Even in the line of telecommunications it has developed progressively. There are a lot of transceivers being produced to increase your signal. XENPAK Transceiver is a package with a transmitter and a receiver. To be able to transmit data, we need transceivers. The most common way of transmitting data is to use light-based fiber optics. The use of electronic signals is the traditional and slower way of transmitting data. The best modules to use today are the XFP and SFP modules.