Connector Specifications; 10/100 Ports - Cisco Catalyst 2950 Hardware Installation Manual

Appendix B Connectors and Cables

Connector Specifications

10/100 Ports

The 10/100 Ethernet ports use standard RJ-45 connectors and Ethernet pinouts
with internal crossovers, as shown by an X in the port name. These ports have the
transmit (TD) and receive (RD) signals internally crossed so that a twisted-pair
straight-through cable and adapter can be attached to the port. Figure B-1 shows
the pinout.
When connecting 10/100 ports to other devices, such as servers, workstations, and
routers, you can use a two or four twisted-pair, straight-through cable wired for
10BASE-T and 100BASE-TX. Figure B-8 shows the two twisted-pair,
straight-through cable schematics. Figure B-10 shows 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-9 shows the two
twisted-pair, crossover cable schematics. Figure B-11 shows 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 2950 Desktop Switch Hardware Installation Guide
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