Channel Frequencies
2-4
Channel Frequencies
The channel sets the center radio frequency for the wireless device. The RoamAbout PC
Card can support up to 14 channels; however, the number of available channels varies in
different countries.
•APs within the same wireless infrastructure network can be set to different channels.
You can change the channel in an AP. The client automatically uses the same channel
as the AP.
•Wireless clients automatically switch to the AP’s channel when roaming between APs
in a wireless network; for example, there are two APs in a wireless network where
AP1 uses channel 1 and AP 2 uses channel 6. When connected to AP1, the client
automatically uses channel 1. When roaming to AP2, the client automatically changes
to channel 6.
•To avoid radio interference, adjacent APs should be set to different channels that are
at least five channels apart. The APs do not necessarily have to be in the same wireless
network. For example, you have three APs whose coverage areas overlap; set the
channels to 1, 6 and 11, if possible.
Due to local radio regulations, not all channels are available in all countries.
•In a LAN-to-LAN configuration, the APs must be set to the same channel.
•In an Ad-Hoc network, all clients must use the same channel to communicate. The
client uses a default channel which cannot be changed, with the exception of Mac and
Windows XP clients. You can set the channel on Mac and Windows XP operating
systems.
See “Supported Frequency Sub-Bands” on page A-3 for a list of channels supported by
country.
NOTE: If you have two 802.11b PC Cards installed in the RoamAbout R2,
the channels between the PC Cards must be at least 5 channels apart from
each other.
NOTE