The Cisco® 100BASE-X Small Form-factor Pluggable (SFP) is a hot-swappable input/output device that plugs into a Fast Ethernet port or slot, linking the port with the network.<br>Main features include the following:<br>-Hot-swappable when deployed, the switch or router does not have to reboot.<br>-Supports the "pay-as-you-populate" model.<br>-Interchangeable with other 100BASE-X SFPs on the same line card.<br>-Supports the Cisco quality ID feature that enables the switch or router to identify whether or not the SFP is a Cisco qualified SFP.<br>-Optically interoperable with respective 100BASE-X Ethernet interfaces on the same link.<br><br>Cisco 100BASE-ZX SFP<br>The Cisco 100BASE-ZX SFP (part number GLC-FE-100ZX) operates on ordinary single-mode fiber-optic (SMF) link spans up to 80 kilometers long.