Appendix B Connectors and Cables
Connector Specifications
B-2
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-05
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.
