Connecting To 1000Base-T Devices - Cisco Catalyst 3550 Installation Manual

Connector Specifications

Connecting to 1000BASE-T Devices

Note
Note
Catalyst 3550 Multilayer Switch Hardware Installation Guide
B-2
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.
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.
crossover cable schematics.
Be sure to use a four twisted-pair, Category 5 cable when connecting to a
1000BASE-T-compatible device.
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
Pin Label
1 TP0+
2 TP0-
3 TP1+
4 TP2+
5 TP2-
6 TP1-
7 TP3+
8 TP3-
Appendix B Connector and Cable Specifications
Figure B-12
1 2 3
shows the
4 5 6 7 8
78-11358-03