B-5
Switch Ports and Network Cables
Twisted-Pair Cable/Connector Pin-Outs
Switch Ports and Network
Cables
Twisted-Pair Cable/Connector Pin-Outs
The Auto-MDIX Feature: In the default configuration, “Auto”, the fixed 10/
100Base-TX ports on the Switch 2510G Series 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 MDI/MDI-X” feature, which operates the same way.)
If you connect a Switch 2510G Series twisted-pair port to another switch or
hub, which typically have MDI-X ports, the Switch 2510G Series 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 2510G Series
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 Auto-MDIX operation and link
correctly to the connected device.
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. See “Note on 1000Base-T Cable Require-
ments” on page B-1 for more information on 1000Base-T cabling.
■ 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.
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