HP J9146A Installation Guide - Page 88

Twisted-Pair Cable/Connector Pin-Outs, Auto-MDIX Feature, Other Wiring Rules

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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 Switch 2910al all automatically detect the type of port on the connected device and operate as either an MDI or MDIX 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 a Switch 2910al twisted-pair port to another switch or hub, which typically have MDI-X ports, the Switch 2910al 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 2910al 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 "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 Requirements" on page C-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 standard. ■ For 1000 Mbps connections, 100-ohm Category 5e or better cabling is recommended. C-6 Cabling and Technology Information

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C-6
Cabling and Technology Information
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 Switch 2910al 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 a Switch 2910al twisted-pair port to another switch or hub,
which typically have MDI-X ports, the Switch 2910al 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 2910al 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 “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 C-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.