IBM 86624RY Maintenance Manual - Page 47

The following figure illustrates the wiring in crossover cables. RJ-45 Modular Connector 10BASE-T / 100BASE-TX RJ-45 Modular Connector Twisted Signal Pair Name Pin 1 TD+ 1 Signal Pin Name 1 TD+ 1 TD 2 2 TD 2 RD+ 3 3 RD+ 2 RD 6 6 RD 3, 4 (Not used) 4, 5, 7, 8 Relative to the device connected to the adapter 4, 5, 7, 8 (Not used) Note For additional information about Ethernet protocols, refer to the Ethernet documentation. Ethernet connection problems Note 1. If you use the integrated Ethernet controller, you must use Category 5 cabling. See "Ethernet cable specifications" on page 36 for additional information about Ethernet cable requirements. 2. If you directly connect two workstations (without a hub), or if you are not using a hub with X ports, use a crossover cable. To determine whether a hub has an X port, check the port label. If the label contains an X, the hub has an X port. If the ethernet adapter cannot connect to the network, do the following. 1. Verify that the cable is installed correctly. 2. Check the Ethernet activity light on the front of the server. Note This light is off when you run the diagnostic programs in the Configuration/Setup Utility program. If the Ethernet activity light is off: a. Make sure that the hub and network are operating, and that the correct device drivers are loaded. b. There might be a defective Ethernet connector or cable, or a problem with the hub. 3. Make sure that you are using the correct device drivers that come with the server. 4. Check for operating system-specific causes for the problem. 5. Test the Ethernet controller or adapter. Netfinity 5500 M20 - Type 8662 39