This is a 30m ST (male) to ST (male) blue duplex plenum-rated fiber patch cable. An OM1 cable has a core size of 62.5 microns that can support 10 Gigabit Ethernet at lengths measuring up to 33 meters. It is most commonly used for 100 Megabit Ethernet applications. This plenum-rated cable is the only cable allowed in spaces defined as air plenum-rateds such as raised flooring systems and air handling ducts. Plenum-rated cables must self-extinguish and prevent re-ignition. A duplex cable is a two-strand fiber optic patch cable that works best with transceivers that both transmit and receive. Our patch cables are 100% compliant for all of your networking needs. Our products are guaranteed by federal law to not affect or void OEM warranties.