HP ProCurve 2650 Install Manual page 64

Switch Ports and Network Cables
Twisted-Pair Cable/Connector Pin-Outs
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B-6
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.