An SFP module (or optical transceiver) converts electrical signals from network devices (switches, routers) into optical signals for fiber transmission and vice versa. A key advantage of SFP+ Modules is that they are "hot-swappable", meaning they can be swapped out while the router is still powered on. Many telecom operators and Internet service providers use Active Ethernet technology to connect remote offices and private homes via an optical line. The effective length of the optical communication line is limited only by the type of SFP module used (and could reach up to 80 km); while using a. In the world of fiber optics, the Optical Network Unit (ONU) – often called a fiber modem – is your gateway to the internet.
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