3Com OfficeConnect 3CRWE454A72 User Manual page 51

Wireless Networking 51
Verify that your wireless computers are configured to work in
Infrastructure mode and not Ad Hoc mode. The Access Point is
designed to operate in Infrastructure mode. Ad Hoc mode is not
supported by the Access Point.
If you have a wired and wireless NIC in the same computer, ensure
that the wired NIC is disabled.
Check the status of the Access Point Wireless LED, it should be lit if
wireless is enabled and will flash when there is wireless activity. If not
lit go to "Wireless Settings" on page 33 and enable wireless
networking.
Ensure that the TCP/IP settings for all devices are correct.
Ensure that the Wireless Clients are using the same SSID or Service
Area Name as the Access Point. The SSID is case-sensitive
Ensure that you are using the same level of security on all of your
wireless computers (None, 40/64 or 128 bit) and that all devices are
using the same keys, and the same order of keys where appropriate.
Ensure that you have the Wireless computer enabled in the list of
allowed MAC addresses if you are using Wireless Connection control
on the Access Point.
If you are having difficulty connecting or are operating at a low speed
try changing the antenna positions on the rear of the Access Point. For
more effective coverage you can try reorientating your antennae.
Place one antenna vertically and one horizontally to improve coverage.
Additionally consider moving the wireless computer closer to the
Access Point to confirm that the building structure or fittings are not
adversely affecting the connectivity. If this resolves the problem
consider relocating the Wireless computer or select Clear Channel
Select on the Access Point.
Sources of interference: The 2.4Ghz ISM band is used for 802.11b and
802.11g. This is generally a licence free band for low power
applications, and you may have other devices at your location that
operate in this frequency band. You should take care to ensure that
there are no devices like microwave ovens for example close to the
Access Point or wireless computers as this could affect receiver
sensitivity and reduce the performance of your network. If you are
unsure try relocating both the wireless computers and the Access
Point to establish whether this problem exists.
Most wireless computer Adapters will scan the channels for the
wireless Access Point. If a wireless computer has not located the