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B-3
Catalyst 3750 Switch Hardware Installation Guide
78-15136-02
Appendix B Connector and Cable Specifications
Connector Specifications
Figure B-1 10/100/1000 Port Pinouts
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-2 shows
the pinout.
Note
On switches running Cisco IOS Release 12.1(14)EA1 or later, you can use the
mdix auto command in the CLI to enable the automatic crossover feature. When
the automatic crossover 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 or 10/100/1000 port on the switch, regardless the
type of device on the other end of the connection.
The automatic crossover feature is disabled by default. For configuration
information for this feature, refer to the switch software configuration guide or the
switch command reference
.
60915
2 3 1 4 5 6 7 8 Pin Label
1
2
3
4
5
6
7
8
TP0+
TP0-
TP1+
TP2+
TP2-
TP1-
TP3+
TP3-