The fiber transceiver SFP or SFP+ module converts an electrical signal from a switch or router into light. Fiber patch cords are fundamental components of optical network cabling and are widely used to build fiber links. Manufacturers offer many types of patch cords to suit different applications, such as MPO, LC, SC, FC, ST, simplex/duplex, and singlemode/multimode. They perform key functions: Electrical to Optical Conversion: The transmitter. Fiber optic cables primarily come in two types: Multimode Fiber (MMF): Has a larger core, allowing multiple light modes (paths) to travel. Common types are OM1, OM2, OM3, and OM4.