Cisco RFGW-10, Руководство по установке оборудования

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6-26
Cisco RF Gateway 10 Hardware Installation Guide
OL-16264-04
Chapter 6 Cabling the Cisco RFGW-10 UEQAM
Cabling the Supervisor Engine
Figure 6-20 LC Fiber-Optic SFP Module
LC SFPs provide duplex single-mode and multimode connections in supported devices. Table 6-7 lists
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
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.
63066
SFP Module
Wavelength
(nanometers)
Fiber Type
Core Size
(micron) Modal Bandwidth
(MHz/km)
Cable Distance
1000BASE-SX 850 MMF 62.5
62.5
50.0
50.0
160
200
400
500
722 feet (220 m)
902 feet (275 m)
1640 feet (500 m)
1804 feet (550 m)
1000BASE-LX/L
H 1300 MMF
1
SMF
62.5
50.0
50.0
9/10
500
400
500
—
1804 feet (550 m)
1804 feet (550 m)
1804 feet (550 m)
32,810 feet
(10 km)
1000BASE-ZX 1550 SMF 9/10 — 43.4 to 62 miles
(70 to 100 km)
2
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.