Cisco Catalyst 3550

Appendix B Connector and Cable Specifications
Connector Specifications
B-2
Catalyst 3550 Multilayer Switch Hardware Installation Guide
78-11358-03
You can use Category 3, 4, or 5 cabling when connecting to
10BASE-T-compatible devices. You must use Category 5 cabling when
connecting to 100BASE-TX-compatible 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-11 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-12 shows the
crossover cable schematics.
Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a
1000BASE-T-compatible 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.
Figure B-1 10/100/1000 Port Pinouts
60915
231 45678Pin Label
1
2
3
4
5
6
7
8
TP0+
TP0-
TP1+
TP2+
TP2-
TP1-
TP3+
TP3-