Cisco SFP Module GLC-ZX-SMD

GLC-ZX-SMD Overview

Cisco GLC-ZX-SMD is a 1000BASE-ZX SFP for Long-Reach Single-Mode Fiber.

The 1000BASE-ZX SFP operates on standard single-mode fiber-optic link

spans of up to approximately 70 km in length. The SFP provides an optical

link budget of 21 dB, but the precise link span length depends on multiple

factors such as fiber quality, number of splices, and connectors.

When shorter distances of single-mode fiber (SMF) are used, it might be

necessary to insert an inline optical attenuator in the link to avoid overloading

the receiver. A 10-dB inline optical attenuator should be inserted between the

fiber-optic cable plant and the receiving port on the SFP at each end of the

link whenever the fiber-optic cable span loss is less than 8 dB.

SFP Port Cabling Specifications
Product	Wavelength (nm)	Fiber Type	Core Size (μm)	Modal Bandwidth *(MHz Km)**	Operating Distance (m)
1000BASE-SX	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	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-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)

Note:

*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-μm fibers has a different specification from the

mode-conditioning patch cord for 50-μm fibers.

*ITU-T G.652 SMF as specified by the IEEE 802.3z standard.

*Specified at transmission wavelength.

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GLC-ZX-SMD