10GBASE-L
From Network Dictionary Wiki
10GBase-L, as defined by IEEE 802.3ae, is for single mode fiber (SMF based on G.652) with 1310 nm laser transceiver with a bandwidth of 10 Gbps. 10GBase-E allows optical signal transmission up to 10km. The 10GBASE-LR media type is designed for use over dark fiber, while the 10GBASE-LW media type is designed to connect to SONET equipment.
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