What is the difference between transponders and muxponders?

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.

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