B-3
Catalyst 2950 Desktop Switch Hardware Installation Guide
78-11157-03
Appendix B Connectors and Cables
Connector Specifications
10/100/1000 Ports
The 10/100/1000 Ethernet ports on Catalyst 2950T-24 switches use standard
RJ-45 connectors. Figure B-2 shows the pinout.
Connecting to 10BASE-T and 100BASE-TX Devices
When connecting the ports to 10BASE-T and 100BASE-TX devices, such as
servers, workstations, and routers, you can use a two or four twisted-pair,
straight-through cable wired for 10BASE-T and100BASE-TX. Figure B-6 shows
the two twisted-pair, straight-through cable schematics. Figure B-8 shows the
four twisted-pair, straight-through cable schematics.
When connecting the ports to 10BASE-T- and 100BASE-TX devices, such as
switches or repeaters, you can use a two or four twisted-pair, crossover cable.
Figure B-7 shows the two twisted-pair, crossover cable schematics. Figure B-9
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.
Connecting to 1000BASE-T Devices
When connecting the ports to 1000BASE-T devices, such as servers,
workstations, and routers, you must use a four twisted-pair, Category 5,
straight-through cable wired for 10BASE-T, 100BASE-TX, and 1000BASE-T.
Figure B-10 shows the straight-through cable schematics.
When connecting the ports to other devices, such as switches or repeaters, you
must use a four twisted-pair, Category 5, crossover cable. Figure B-11 shows the
crossover cable schematics.
Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a
1000BASE-T device.
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.
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