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B-6

Cabling and Technology Information

Twisted-Pair Cable/Connector Pin-Outs

Auto-MDIX Feature: The 10/100/1000-T ports support the IEEE 802.3ab

standard, which includes the “Auto MDI/MDI-X” feature. In the default

configuration, “Auto”, the ports on the HP 2920 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.

If you connect an HP 2920 Switch twisted-pair port to another switch or hub,

which typically have MDI-X ports, the 2920 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 HP 2920 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 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 “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-2 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.

■ 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 stan-

dard.

■ For 1000 Mbps connections, 100-ohm Category 5e or better cabling is

recommended.

Questions and Answers:

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HP 2920 Specifications

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