Cisco RFGW-10 Hardware Installation Manual page 166

Cabling the Supervisor Engine
Figure 6-20
LC SFPs provide duplex single-mode and multimode connections in supported devices.
the cable specifications for fiber-optic SFP module ports.
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 6-7 Fiber-Optic SFP Module Port Cabling Specifications
Wavelength
SFP Module (nanometers)
1000BASE-SX 850
1000BASE-LX/L 1300
H
1000BASE-ZX 1550
1. A mode-conditioning patch cord is required. Using an ordinary patch cord 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 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).
2. 1000BASE-ZX SFP modules can reach up to 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.
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.
When the fiber-optic cable span is less than15.43 miles (25 km), you should 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 at each end of the link.
Cisco RF Gateway 10 Hardware Installation Guide
6-26
LC Fiber-Optic SFP Module
Core Size
Fiber Type (micron)
MMF 62.5
62.5
50.0
50.0
MMF 62.5
1
50.0
SMF 50.0
9/10
SMF 9/10
Chapter 6 Cabling the Cisco RFGW-10 UEQAM
Modal Bandwidth
(MHz/km) Cable Distance
160 722 feet (220 m)
200 902 feet (275 m)
400 1640 feet (500 m)
500 1804 feet (550 m)
500 1804 feet (550 m)
400 1804 feet (550 m)
500 1804 feet (550 m)
— 32,810 feet
(10 km)
— 43.4 to 62 miles
(70 to 100 km)
Table 6-7 lists
2
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