Cisco Systems 520 manual Smf

Appendix A Reference

Cabling Guidelines

Note When using shorter distances of single-mode fiber cable, you might need to insert

an inline optical attenuator in the link to avoid overloading the receiver.

Table A-2	Fiber-Optic SFP-Module Port Cabling Specifications
					Modal
		Wavelength		Core Size	Bandwidth
SFP Module		(nanometers)	Fiber Type	(micron)	(MHz/km)	Cable Distance
100BASE-BX-10D		1550	SMF	G.6522	—	32,810 ft (10 km)
100BASE-BX-10U		1310	SMF	G.6522	—	32,810 ft (10 km)
100BASE-FX-FE		Min.: 1270	MMF	50/125	500	6,562 feet (2 km)
100BASE-FX-GE		Typical: 1300		62.5/125
		Max.: 1380
100BASE-LX		1310	SMF	G.6522	—	32,810 ft (10 km)
1000BASE-LX/LH		1300	MMF1	62.5	500	1804 feet (550 m)
				50	400	1804 feet (550 m)
			SMF	50	500	1804 feet (550 m)
				9/10	—	32,810 feet (10 km)
1000BASE-SX		850	MMF	62.5	160	722 feet (220 m)
				62.5	200	902 feet (275 m)
				50	400	1640 feet (500 m)
				50	500	1804 feet (550 m)

1.A mode-conditioning patch cable is required. Using an ordinary patch cable with MMF, 1000BASE-LX/LH SFP modules, and a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (BER). When using the LX/LH SFP module with 62.5-micron diameter MMF, you must also install a mode-conditioning patch cable between the SFP module and the MMF cable on both the sending and receiving ends of the link. The mode-conditioning patch cable is required for link distances greater than 984 feet (300 m).

	User Guide for the Catalyst Express 520 Switches
OL-12761-02		A-11