NOTE:
Using Fixed Configurations. If the port configuration is changed to any of the fixed configurations
though, for example 100 Mbps/full duplex, the port operates as MDI-X only and the correct cable type
must be used: for connections to MDI ports, such as end nodes, use a straight-through cable; for
connections to MDI-X ports, such as on hubs and other switches, use a crossover cable.
Other Wiring Rules:
• All twisted-pair wires used for 10 Mbps, and 100 Mbps operation must be twisted through the entire length
of the cable. The wiring sequence must conform to EIA/TIA 568-B (not USOC). See “Twisted-Pair Cable
Pin Assignments” later in this appendix for a listing of the signals used on each pin.
• For 1000BASE-T connections, all four pairs of wires in the cable must be available for data transmission.
• For 10 Mbps connections to the ports, you can use Category 3, 4, or 5 unshielded twisted-pair cable, as
supported by the IEEE 802.3 Type 10BASE-T standard.
• For 100 Mbps connections to the ports, use 100-ohm Category 5 UTP or STP cable only, as supported by
the IEEE 802.3u Type 100BASE-TX standard.
• For 1000 Mbps connections, 100-ohm Category 5e or better cabling is recommended.
Straight-through Twisted-Pair Cable for10 Mbps or 100 Mbps Network
Connections
Because of the Auto-MDIX operation of the 10/100 ports on the switch, for all network connections, to PCs,
servers or other end nodes, or to hubs or other switches, you can use straight-through cables.
If any of these ports are given a fixed configuration, for example 100 Mbps/Full Duplex, the ports operate as
MDI-X ports, and straight-through cables must be then used for connections to PC NICs and other MDI ports.
Cable Diagram
Connector A Connector B
Straight-through cable
white/orange
orange/white
white/green
green/white
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
NOTE:
• Pins 1 and 2 on connector “A” must be wired as a twisted pair to pins 1 and 2 on connector “B”.
• Pins 3 and 6 on connector “A” must be wired as a twisted pair to pins 3 and 6 on connector “B”.
• Pins 4, 5, 7, and 8 are not used in this application, although they may be wired in the cable.
40 Straight-through Twisted-Pair Cable for10 Mbps or 100 Mbps Network Connections
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