Twisted-Pair Cable/Connector Pin-Outs - HP J4093A Installation Manual

Twisted-Pair Cable/Connector Pin-Outs

The RJ-45 connectors on the 10/100Base-TX ports on the Switch 1600M and
2424M are all wired as MDI-X ports. 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 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 or
STP cable only, as supported by the IEEE 802.3u Type 100Base-TX stan-
dard.
Connectors and Cables
Twisted-Pair Cable/Connector Pin-Outs
B-3