Appendix B Connectors and Cables
Connector Specifications
Figure B-2 10/100 RJ-45 Pinouts
Pin Label
1RD+
2RD-
3TD+
4NC
5NC
6TD-
7NC
8NC
When connecting 10/100 ports to other devices, such as servers, workstations, and routers, you can use
atwo or four twisted-pair, straight-through cable wired for 10BASE-T and 100BASE-TX. Figure B-6shows the two twisted-pair, straight-through cable schematics. Figure B-8shows the four twisted-pair, straight-through cable schematics.
When connecting the ports to other devices, such as switches or repeaters, you can use a two or four twisted-pair, crossover cable. Figure B-7shows the two twisted-pair, crossover cable schematics. Figure B-9shows the four twisted-pair, crossover cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T devices. You must use Category 5 cabling when connecting to 100BASE-TX devices.
Note Use a straight-through cable to connect two ports only when one port is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X or when both ports do not have an X.
Catalyst 2940 Switch Hardware Installation Guide
