Chapter 1 Overview
Front-Panel Description
Port Numbering
Table 1-1lists the port and slot numbering for the Catalyst 2940 switches.
Table 1-1 Port and Slot Numbering
Port or Slot type | Catalyst 2940-8TT-S | Catalyst 2940-8TF-S |
| | |
10/100 Ethernet | 1 through 8 | 1 through 8 |
| | |
Gigabit Ethernet | 1 | — |
10/100/1000 | | |
| | |
100BASE-FX | — | 9 |
| | |
SFP module | — | 1 |
| | |
10/100 Ports
The 10/100 ports 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 twisted-pair cabling. You can use Category 3, 4, or 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.
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.”
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 Port
The 10/100/1000 port on the Catalyst 2940-8TT-S switch uses RJ-45 connectors and twisted-pair cabling. The port 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.
Catalyst 2940 Switch Hardware Installation Guide
