38
Cable and Connectors
Cables and Adapters
Figure 3 Fiber-Optic SFP Module LC Connector
Warning: Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams
or view directly with optical instruments. Statement 1051
Cables and Adapters
SFP Module Cables, page 38
Cable Pinouts, page 38
SFP Module Cables
Each port must match the wave-length specifications on each end of the cable, and for reliable communications, the
cable must not exceed the allowable length.
Notes
The maximum operating temperature of the switch varies depending on the type of SFP module that you use.
Modal bandwidth applies only to multimode fiber.
A mode-field diameter/cladding diameter = 9 micrometers/125 micrometers.
A mode-conditioning patch cord is required when using 1000BASE-LX/LH SFP modules, MMF, and a short link
distance. Using an ordinary patch cord 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
cord between the SFP module and the MMF cable on both the sending and receiving ends of the link. The
mode-conditioning patch cord is required for link distances greater than 984 feet (300 m).
1000BASE-ZX SFP modules can send data up to 62 miles (100 km) by using dispersion-shifted SMF or
low-attenuation SMF. The distance depends on the fiber quality, the number of splices, and the connectors.
When the fiber-optic cable span is less than 15.43 miles (25 km), insert a 5-decibel (dB) or 10-dB inline optical
attenuator between the fiber-optic cable plant and the receiving port on the 1000BASE-ZX SFP module.
Cable Pinouts
Figure 4 Two Twisted-Pair Straight-Through Cable Schematic for 10/100 Ports
Switch
3 TD+
6 TD–
1 RD+
2 RD–
Router or PC
3 RD+
6 RD–
1 TD+
2 TD–
H5578
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