Port Numbering - Cisco Catalyst 2940 Overview Manual

Chapter 1 Overview

Port Numbering

Table 1-1
Table 1-1
Port or Slot type
10/100 Ethernet
Gigabit Ethernet
10/100/1000
100BASE-FX
SFP module
10/100 Ports
The 10/100 ports use RJ-45 connectors and twisted-pair cabling. The ports can connect to these devices:
•
•
When connecting the switch to workstations, servers, and routers, be sure that the cable is a twisted-pair
Note
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
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:
•
•
•
OL-6157-01
lists the port and slot numbering for the Catalyst 2940 switches.
Port and Slot Numbering
Catalyst 2940-8TT-S
1 through 8
1
—
—
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.
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 2940-8TF-S
1 through 8
—
9
1
Appendix B, "Connectors and Cables."
Catalyst 2940 Switch Hardware Installation Guide
Front-Panel Description
1-3