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The GLC-SX-MMD 1000BASE-SX SFP is made for Multimode Fiber only.The 1000BASE-SX SFP, compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50 ?m multimode fiber links up to 550 m and on 62.5 ?m Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m. It can support up to 1km over laser-optimized 50 ?m multimode fiber cable. 850-nm wavelength, extended operating temperature range and DOM support, dual LC/PC connector.The table provides cabling specifications for the SFPs that you install in the Gigabit Ethernet port.Note that all SFP ports have LC-type connectors, and the minimum cable distance for all SFPs listed (multimode and single-mode fiber) is 6.5 feet (2 m).SFP Port Cabling Specifications

Product	Wavelength (nm)	Fiber Type	Core Size (?m)	Modal Bandwidth (MHz*?Km)***	Operating Distance (m)
1000BASE-SX(GLC-SX-MMD)	850	MMF	62.5	160 (FDDI-grade)	220 (722 ft)
			62.5	200 (OM1)	275 (902 ft)
			50	400 (400/400)	500 (1,640 ft)
			50	500 (OM2)	550 (1,804 ft)
			50	2000 (OM3)	1000 (3281 ft)
1000BASE-LX/LH(GLC-LH-SMD)	1310	MMF*	62.5	500	550 (1,804 ft)
			50	400	550 (1,804 ft)
			50	500	550 (1,804 ft)
		SMF	-**	-	10,000 (32,821 ft)
1000BASE-EX	1310	SMF	-**	-	40,000 (131,234 ft)
1000BASE-ZX(GLC-ZX-SM?)(GLC-ZX-SMD?)	1550	SMF	-	-	Approximately 70 km depending on link loss
1000BASE-BX-U	1310	SMF	-**	-	10,000 (32,821 ft)
1000BASE-BX-D	1490	SMF	-**	-	10,000 (32,821 ft)

^*A mode-conditioning patch cord, as specified by the IEEE standard, is required regardless of the span length. Note how the mode conditioning patch cord for 62.5-?m fibers has a different specification from the mode-conditioning patch cord for 50-?m fibers.^**ITU-T G.652 SMF as specified by the IEEE 802.3z standard.^***Specified at transmission wavelength.