IBM 865741Y Handbook - Page 235

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 217