HP J4903A User Manual - Page 73

Twisted-Pair Cable/Connector Pin-Outs, Using Fixed Configurations., Other Wiring Rules

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Note Switch Ports and Network Cables Twisted-Pair Cable/Connector Pin-Outs Twisted-Pair Cable/Connector Pin-Outs If you connect a Switch 2800 Series device's twisted-pair port to another switch or hub, which typically have MDI-X ports, the Switch 2800 Series device 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 2800 Series device's 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. Using Fixed Configurations. If the port configuration is changed to any of the fixed configurations though, for example 100 Mbps/full duplex, the port operates as MDI-X only and the correct cable type must be used: for connections to MDI ports, such as end nodes, use a "straight-through" cable; for connections to MDI-X ports, such as on hubs and other switches, use a "crossover" cable. 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. Please see "Note on 1000Base-T Cable Requirements" on page B-1 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. B-5 Switch Ports and Network Cables

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B-5
Switch Ports and Network Cables
Twisted-Pair Cable/Connector Pin-Outs
Switch Ports and Network
Cables
Twisted-Pair Cable/Connector Pin-Outs
If you connect a Switch 2800 Series device’s twisted-pair port to another
switch or hub, which typically have MDI-X ports, the Switch 2800 Series device
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 2800 Series
device’s 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.
Note
Using Fixed Configurations.
If the port configuration is changed to any of
the fixed configurations though, for example 100 Mbps/full duplex, the port
operates as MDI-X only and the correct cable type must be used: for connec-
tions to MDI ports, such as end nodes, use a “straight-through” cable; for
connections to MDI-X ports, such as on hubs and other switches, use a
“crossover” cable.
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.
Please see
“Note on 1000Base-T Cable
Requirements” on page B-1
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.