Twisted-Pair Cable/Connector Pin-Outs - HP 2920 Installation And Getting Started Manual

Cabling and Technology Information

Twisted-Pair Cable/Connector Pin-Outs

B-6
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
ments" on page B-2
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.
"Note on 1000BASE-T Cable Require-
for more information on 1000Base-T cabling.