Specifications

17
Installation and Configuration Note for the Catalyst 4500 Series Supervisor Engine II-Plus TS
78-16551-01
SFP Guidelines
Fiber-Optic SFP Modules
Some fiber-optic SFP modules use LC-type connectors, as shown in Figure 6.
Caution Protect your fiber-optic SFP modules by inserting clean dust plugs into the SFP modules after you
remove the cables. Be sure to clean the optic surfaces of the fiber-optic cables with a soft antistatic cloth
before you reconnect them to another SFP module. Avoid getting dust and other contaminants into the
optical bores, as the optics do not work correctly when obstructed with dust.
Figure 6 LC Fiber-Optic SFP Module
LC SFPs provide duplex single-mode and multimode connections in supported devices. Table 4 lists the
cable specifications for fiber-optic SFP module ports.
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Table 4 Fiber-Optic SFP Module Port Cabling Specifications
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/LH 1300 MMF
1
SMF
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).
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
2. 1000BASE-ZX SFP modules can reach 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.