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Cisco GLC-ZX-SMD 1000BASE-ZX SFP for Long-Reach Single-Mode Fibers
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.
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 (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) |
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|
50 |
400 (400/400) |
500 (1,640 ft) |
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|
50 |
500 (OM2) |
550 (1,804 ft) |
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|
50 |
2000 (OM3) |
1000 (3281 ft) |
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|
1000BASE-LX/LH |
1310 |
MMF* |
62.5 |
500 |
550 (1,804 ft) |
|
50 |
400 |
550 (1,804 ft) |
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|
50 |
500 |
550 (1,804 ft) |
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|
SMF |
-** |
- |
10,000 (32,821 ft) |
||
|
1000BASE-EX |
1310 |
SMF |
-** |
- |
40,000 (131,234 ft) |
|
1000BASE-ZX |
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-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.
