Troubleshooting; Diagnosing Problems - 3Com 3CRWE20096A User Manual

4

Diagnosing Problems

T
ROUBLESHOOTING
If you have difficulty with the access point, try the solutions in the following table.
Symptom
Access point does not
power up.
No operation.
Access point powers up, but
has no connection to the wired
network.
Access point powers up, but
does not associate with
wireless clients.
A client cannot associate with
the access point even though
configuration settings appear
to match.
Slow or erratic performance.
Running on a computer
connected to the wired LAN,
the 3Com Wireless
Infrastructure Device Manager
cannot find an access point.
Solutions
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
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.
Make sure that the Ethernet cable is plugged in securely.
Verify the network wiring and topology for proper
configuration:
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.
Verify that the wireless client is operating correctly.
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.
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.
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.
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.