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Specifications
Twisted-Pair Cable/Connector Pin-Outs
A-7
Twisted-Pair Cable/Connector Pin-Outs
The Auto-MDIX Feature: In the default configuration, “Auto”, the fixed 10/100/1000BASE-T ports on the
switches all automatically detect the type of port on the connected device and operate as either an MDI or
MDI-X port, whichever is appropriate. So for any connection, a straight-through twisted-pair cable can be
used—
you no longer have to use crossover cables
, although crossover cables can also be used for any of the
connections. (The 10/100/1000-T ports support the IEEE 802.3ab standard, which includes the “Auto-MDIX”
feature.)
If you connect a switch twisted-pair port to another switch or hub, which typically have MDI-X ports, the switch
port automatically operates as an MDI port. If you connect it to an end node, such as a server or PC, which
typically have MDI ports, the switch port operates as an MDI-X port. In all cases, you can use standard
straight-through cables or crossover cables.
If you happen to use a correctly wired crossover cable, though, the switch will still be able to automatically
detect the MDI/MDI-X operation and link correctly to the connected device.
Other Wiring Rules
● All twisted-pair wires used for 10BASE-T, and 100BASE-TX 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 and 10GBASE-T connections, all four pairs of wires in the cable must be available for
data transmission.
● For 10BASE-T 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 100BASE-TX 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 1000BASE-T connections, 100-ohm Category 5e or better cabling is recommended.
● For 10GBASE-T connections, 100-ohm Category 6a or better cabling is recommended.
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.