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1000Base-SX
1000 Mbps Gigabit Ethernet specification using two strands of multimode fiber-optic cable per link. Normal optical frequency spectrum of this interface is 850 nm. To guarantee proper signal recovery, a 1000BASE-SX link cannot exceed 721.78 feet (220 meters) in length when 62.5 core diameter fiber is used; nor can it exceed 1,804.46 feet (550 meters) in length when 50 core diameter fiber is used. The 1000BASE-SX specification is based on the IEEE 802.3z standard.