10/100/1000 Ports - Cisco Catalyst 2950 Hardware Installation Manual

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Note

10/100/1000 Ports

Note
Catalyst 2950 Desktop Switch Hardware Installation Guide
2-10
When connecting the switch to workstations, servers, and routers, be sure that the
cable is a twisted-pair straight-through cable. When connecting the switch to hubs
or other switches, use a twisted-pair crossover cable. Pinouts for the cables are
described in Appendix B, "Connectors and Cables."
The 10/100 ports can be explicitly set to operate in any combination of half
duplex, full duplex, 10 Mbps, or 100 Mbps. They can also be set for speed and
duplex autonegotiation, compliant with IEEE 802.3U. In all cases, the cable
length from a switch to an attached device cannot exceed 328 feet (100 meters).
When set for autonegotiation, a port senses the speed and duplex settings of the
attached device and advertises its own capabilities. If the attached device supports
autonegotiation, the port negotiates the best connection (that is, the fastest line
speed that both devices support and full-duplex transmission, if the attached
device supports it) and configures itself accordingly.
The 10/100/1000 ports on the Catalyst 2950T-24 and the Catalyst 2950 LRE
switches use RJ-45 connectors and twisted-pair cabling. The ports can connect to
these devices:
• 10BASE-T devices, such as workstations and hubs, through standard RJ-45
connectors and two or four twisted-pair, Category 5 cabling.
100BASE-TX devices, such as high-speed workstations, servers, hubs,
•
routers, and other switches, through standard RJ-45 connectors and two or
four twisted-pair, Category 5 cabling.
1000BASE-T devices, such as high-speed workstations, servers, hubs,
•
routers, and other switches, through standard RJ-45 connectors and four
twisted-pair, Category 5 cabling.
When connecting the switch to a 1000BASE-T device, be sure to use a four
twisted-pair, Category 5 cable.
Chapter 2 Overview
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