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B-1

Cables and Connectors

This appendix includes hub connector information and network cable infor-

mation for cables that should be used with the HP 10/100 hubs, including

minimum pin-out information for twisted-pair cables.

Note Incorrectly wired cabling is the most common cause of problems for LAN

communications. HP recommends that you work with a qualified LAN cable

installer for assistance with your cabling requirements.

Twisted-Pair Cable/Connector Pin-Outs

The RJ-45 10/100Base-T ports on the HP 10/100 hubs are wired as MDI-X ports.

Port 1 on each hub can be changed to an MDI port by pressing the MDI-X/MDI

switch on the front of the hub to the MDI position. The type of twisted-pair

cable you connect to these ports (either “straight-through” or “crossover”)

depends on the type of device at the other end of the cable.

The basic rule is, when connecting same-type ports together (for example

MDI-X-to-MDI-X), use crossover cable; when connecting opposite-type ports

together (for example MDI-X-to-MDI), use straight-through cable.

These additional rules apply:

■ 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 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 cable

only, as supported by the IEEE 802.3u Type 100Base-TX standard.

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HP 12M Manual de Instalação Página 45