Cisco WS-C3750G-24PS-E Hardware Installation Guide - Page 128
B-5, 100 Port Pinouts
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Connector Specifications Appendix B Connector and Cable Specifications 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 B-5 shows the two twisted-pair straight-through cable schematics. Figure B-7 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 B-6 shows the two twisted-pair crossover cable schematics. Figure B-7 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. 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-2 10/100 Port Pinouts Pin Label 1 RD+ 2 RD- 3 TD+ 4 NC 5 NC 6 TD- 7 NC 8 NC 12345678 H5318 Catalyst 3750 Switch Hardware Installation Guide B-4 78-15136-02