100base-fx ports – Cisco 3750 User Manual
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B-2
Catalyst 3750 Metro Switch Hardware Installation Guide
OL-9160-02
Appendix B Connector and Cable Specifications
Connector Specifications
Figure B-1
10/100 Port Pinouts
You can use the mdix auto interface configuration command to enable the automatic crossover feature.
When the automatic crossover feature is enabled, the switch detects the required cable type and
configures the interfaces accordingly. Therefore, you can use either a crossover or a straight-through
cable for all connections to an Ethernet port on the switch.
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.
Connecting to 10BASE-T- and 100BASE-TX-Compatible Devices
When you connect the ports to 10BASE-T- and 100BASE-TX-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.
shows the two twisted-pair, straight-through
cable schematics.
shows the four twisted-pair, straight-through cable
schematics.
When you connect the ports to 10BASE-T- and 100BASE-TX-compatible devices, such as switches or
repeaters, you can use a two or four twisted-pair, crossover cable.
shows the two
twisted-pair, crossover cable schematics.
shows the four twisted-pair, crossover
cable schematics.
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.
100BASE-FX Ports
The 100BASE-FX ports use MT-RJ connectors, as shown in
. The 100BASE-FX ports use
50/125- or 62.5/125-micron multimode fiber-optic cabling.
You can connect a 100BASE-FX port to an SC or ST port on a target device by using one of the MT-RJ
fiber-optic patch cables listed in
. Use the Cisco part numbers in
to order the patch
cables that you need.