2-5
Catalyst 2970 Switch Hardware Installation Guide
OL-6422-01
Chapter 2 Switch Installation
Preparing for Installation
Installation Guidelines
When determining where to place the switch, be sure to observe these
requirements:
• For 10/100/1000 ports, including 1000BASE-T SFP module ports, cable
lengths from the switch to connected devices are up to 328 feet (100 meters).
• Table 2-1 lists the cable specifications for 1000BASE-SX, 1000BASE-LX,
and 1000BASE-ZX fiber-optic SFP module connections. Each port must
match the wave-length specifications on the other end of the cable, and the
cable must not exceed the stipulated cable length for reliable
communications.
Table 2-1 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
50
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
62.5
50
50
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
100BASE-FX Min.: 1270
Typical: 1300
Max.: 1380
MMF 50/125
62.5/125
500 6,562 feet (2 km)
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