Chapter 1 Overview
Front-Panel Description
1-8
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-03
100BASE-FX and 1000BASE-SX Ports
The 100BASE-FX and 1000BASE-SX ports both use 50/125- or 62.5/125-micron
multimode fiber-optic cabling. The 100BASE-FX ports operate only at 100 Mbps
in full-duplex mode, and the 1000BASE-SX ports operate only at 1000 Mbps in
full-duplex mode.
In full-duplex mode, the cable length from a switch to an attached device cannot
exceed 1804 feet (550 meters).
You can connect a 100BASE-FX or 1000BASE-SX port to an SC or ST port on a
target device by using one of the MT-RJ fiber-optic patch cables listed in
Table 1-1. Use the Cisco part numbers in Table 1-1 to order the patch cables that
you need.
GBIC Module Ports
The GBIC module slots support these modules:
• 1000BASE-SX GBIC module for fiber-optic connections that cannot exceed
1804 feet (550 meter).
• 1000BASE-LX/LH GBIC module for fiber-optic connections that cannot
exceed 32,810 feet (10 kilometer).
• 1000BASE-ZX GBIC module for fiber-optic connections that cannot exceed
328,100 feet (100 kilometer).
Table 1-1 MT-RJ Patch Cables for 100BASE-FX and 1000BASE-SX
Connections
Type Cisco Part Number
1-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-1M
3-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-3M
5-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-5M
1-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-1M
3-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-3M
5-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-5M
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