Cisco 2950 Hardware Installation Guide - Page 28
/100/1000 Ports, The 10/100/1000 ports on Catalyst 2950T-24, Catalyst 2950T-48-SI
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Front-Panel Description Chapter 1 Overview Note 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." For information on how to identify a crossover cable, go to the "Identifying a Crossover Cable" section on page B-5. 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. 10/100/1000 Ports The 10/100/1000 ports on Catalyst 2950T-24, Catalyst 2950T-48-SI, and 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. Note When connecting the switch to a 1000BASE-T device, be sure to use a four twisted-pair, Category 5 cable. Note When connecting the switch to workstations, servers, and routers, be sure to use 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." For information on how to identify a crossover cable, go to the "Identifying a Crossover Cable" section on page B-5. The 10/100/1000 ports on the Catalyst 2950T-24 switch can be explicitly set to operate at 10, 100, or 1000 Mbps, but only in full-duplex mode. The 10/100/1000 ports on the Catalyst 2950T-48-SI and Catalyst 2950 LRE switches can be explicitly set to operate at 10 or 100 Mbps in full- or half-duplex mode or at 1000 Mbps in full-duplex mode. The 10/100/1000 ports can also be set for speed autonegotiation, compliant with IEEE 802.3AB. In all cases, the cable length from a switch to an attached device cannot exceed 328 feet (100 meters). Catalyst 2950 Switch Hardware Installation Guide 1-8 OL-6156-01