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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
OL-16264-04
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