Appendix A. Ethernet Cable Specifications
This appendix contains the specifications for the unshielded
twisted-pair (UTP) cables that can be used to connect the server to
an IEEE Standard 802.3 network.
The Ethernet controller on your system board provides 10BASE-T
and 100BASE-TX support through the RJ-45 connector on the back
of your server. When you connect your server to the network, the
Ethernet controller automatically detects the data-transfer rate
(10 Mbps or 100 Mbps) on the network and then sets the controller
to operate at the appropriate rate.
The Ethernet controller supports the auto-detection mode only.
When you install your device drivers and configure the Ethernet
controller for use with your operating system, do not select the
10BASE-T mode. To ensure proper operation of your controller,
always select the default parameters provided.
The following information describes the specifications for the
unshielded twisted-pair (UTP) cable that can be used to connect the
server to an IEEE Standard 802.3 network.
To connect the server 10BASE-T or 100BASE-TX port to a 10BASE-T
or 100BASE-TX port on a repeater, use a UTP cable with RJ-45
connectors at both ends. An EIA/TIA-568 Category 5 cable must be
used for 10BASE-T and 100BASE-TX.
Attention:
The 10BASE-T Ethernet and the 100BASE-TX Fast Ethernet cabling
in the network must be Category 5 or higher to meet various
standards, including electromagnetic compatibility.
The cables used in 10BASE-T or 100BASE-TX link segments do not
require grounding. However, all devices connected to the cables
must be grounded.
Connect the appropriate type of UTP cable to the repeater.
If the port on the repeater is a crossover port (also called an
MDI-X port), use a UTP cable that is wired as a straight-through
cable.
Copyright IBM Corp. 1998
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