Lenovo ThinkSystem SR665 V3 User Manual

Also see for 7D9A: System configuration guide User guide

• Make sure that the cable rating is sufficient for the data rate of the network. For example, a 1 GbRJ45 network requires a cable of Cat5e or higher rating.Step 3. Determine whether the switch supports auto-negotiation. If not, try configuring the integratedEthernet controller manually to match the speed of the switch port. Also, if forward error correction(FEC) modes are supported, make sure that both the adapter and the switch port have matchingsettings.Step 4. Check the Ethernet controller LEDs on the server. These LEDs indicate whether there is a problemwith the connector, cable, or switch.If the Ethernet function is implemented on the system board assembly, the Ethernet controller LEDlocations are specified in “Troubleshooting by system LEDs and diagnostics display” on page 198.• The Ethernet link status LED is lit when the Ethernet controller has established link with theswitch port. If the LED is off, there might be a defective connector or cable or a problem with theswitch port. In some cases, a bi-color link LED is used. Green indicates a link at the highestnetwork speed. Yellow indicates a link lower than the highest network speed.• The Ethernet transmit/receive activity LED is lit or blinks when the Ethernet controller sends orreceives data over the Ethernet network. If the Ethernet transmit/receive activity is off, make surethat the switch is powered on, the network is operating, and the correct device drivers areinstalled.Step 5. Check for operating-system-specific causes of the problem, and make sure that the operatingsystem drivers are installed correctly.Step 6. Make sure that the device drivers on the client and server are using the same protocol.If the Ethernet controller still cannot connect to the network but the hardware appears to be working, thenetwork administrator must investigate other possible causes of the error.214 ThinkSystem SR665 V3 User Guide