In optical fiber communications, transponders and muxponders are the elements that send and receive the optical signal over the fiber. Muxponders combine (multiplex) multiple low capacity services into a single high capacity wavelength/uplink, utilizing ITU optical transport network (OTN) protocol and mapping. Transponders convert each optical signals from the customer equipment to a wavelength, and can transport data, storage, video, and voice services. The rate and type of the service and the uplink are the same.
