3Com 3CRWE20096A User Guide - Page 19

4 TROUBLESHOOTING Diagnosing Problems If you have difficulty with the access point, try the solutions in the following table. Symptom Solutions Access point does not power up. Make sure the power adapter cables are plugged in securely. Check for a faulty access point power supply. Check for a failed AC power supply No operation. Verify the access point configuration. Review access point firmware revisions and update firmware if necessary. Make sure that there are no duplicate IP addresses on the network. Unplug the access point and ping the assigned address to make sure that no other device responds to that address. Access point powers up, but Make sure that the Ethernet cable is plugged in securely. has no connection to the wired network. Verify the network wiring and topology for proper configuration: s Use the provided Ethernet crossover cable. If you use a standard straight-through (UTP) Ethernet cable, you must connect to the hub's uplink (MDIX) port. s Verify that the wireless client is operating correctly. Access point powers up, but does not associate with wireless clients. Confirm that the WLAN service area on the access point matches that on the clients. Verify that the clients are operating correctly. Make sure that security settings on the access point match those on the clients. Make sure the preamble lengths match. Try repositioning the access point to improve reception. Check the range and move clients closer if necessary. A client cannot associate with the access point even though configuration settings appear to match. If the access point is set to find a channel automatically, it may be choosing a channel that the client does not support. Set the access point to use a channel within the range supported by the client. Slow or erratic performance. Try changing the wireless channel on the access point. Check the access point connectors and cabling for loose connections. Check the wired network topology and configuration for malfunctions. Running on a computer connected to the wired LAN, the 3Com Wireless Infrastructure Device Manager cannot find an access point. Make sure that the computer is connected to the same network segment as the access point. If your computer has more than one network interface card installed, make sure you have chosen the right one.