1000BaseLH or 1000Base-LH
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also known as 1000Base-LH, is a physical layer specification for Gigabit Ethernet over fiber optic cabling as defined in IEEE 802.3z. LH stands for long haul, and 1000Base- LH uses long wavelength laser (1310nm) over multimode and single-mode fiber. 1000BaseLH can support a maximum distance of 550m for multimode fiber, and of 10km for single mode fiber. IEEE Specification: IEEE 802.3z