Features:-Hot-swappable when deployed, the switch or router does not have to reboot.-Supports the "pay-as-you-populate" model.-Interchangeable with other 100BASE-X SFPs on the same line card.-Supports the Cisco quality ID feature that enables the switch or router to identify whether or not the SFP is a Cisco qualified SFP.-Optically interoperable with respective 100BASE-X Ethernet interfaces on the same link.The Cisco 100BASE-FX SFP (part number GLC-FE-100FX) operates on ordinary multimode fiber-optic (MMF) link spans up to 2 kilometers long.