According to the Ethernet nomenclature of10GbE interfaces, a 10GBase SR, SR stands for short reach, is an interface with optical fibers that operates with short wavelengths of 850 nm and with 64B66B coding. It is described in IEEE 802.3ae.
The 10GBase-SR interface has the full data rate of10 Gigabit Ethernet with 10.3125 GBaud. It uses two 50/62.5 µm multimode fibers as the transmission medium for the send and receive directions. If the 10GBase-SR is operated on existing optical fibers with OM class OM2, then the bridgeable distance is about 85 m. With multimode fibers of OM class OM3, the bridgeable distance increases to 300 m, and with OM4, to 450 m. A low-cost VCSEL laser is used as the light source. As fiber optic connectors, 10GBase-SR uses SC connectors and LC connectors in duplex design. Technically, the 10GBase-SR interface is implemented with an optical transceiver module in an XFP module or SFP+ module; it is used in data centers.