user manual

A-2
Cisco ME 3400 Ethernet Access Switch Hardware Installation Guide
OL-7677-04
Appendix A Connector and Cable Specifications
Connector Specifications
Figure A-1 10/100 Port Pinouts
When connecting 10/100 ports to compatible 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 A-4
shows the two twisted-pair straight-through cable schematics. Figure A-6 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 A-5 shows the two twisted-pair crossover cable schematics.
Figure A-7 shows the four twisted-pair crossover cable schematics.
Note You can use the mdix auto interface configuration command in the CLI to enable the automatic
medium-dependent interface crossover (auto-MDIX) feature. When the auto-MDIX feature is enabled,
the switch detects the required cable type for copper Ethernet connections and configures the interfaces
accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a
copper 10/100, 10/100/1000, or 1000BASE-T SFP module port on the switch, regardless of the type of
device on the other end of the connection.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T-compatible devices. You must
use Category 5 (or higher) cabling when connecting to 100BASE-TX-compatible 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.
This applies only to switches on which auto-MDIX is disabled.
H5318
231 45678Pin Label
1
2
3
4
5
6
7
8
RD+
RD-
TD+
NC
NC
TD-
NC
NC