HP MSM3xx Management And Configuration Manual page 47

The number of channels available for use in a particular country are determined by the
regulations defined by the local governing body and are automatically configured by the AP
based on the Country setting you define by selecting Management > Country. This means
that the number of non-overlapping channels available to you varies by geographical location.
The following table shows the number of channels that are available in North America, Japan,
and Europe.
Region
North America
Japan
Europe
Since the minimum recommended separation between overlapping channels is 25 MHz (five
channels) the recommended maximum number of overlapping cells you can have in most
regions is three. The following table gives examples relevant to North America, Japan, and
Europe (applies to 22 MHz channels in the 2.4 GHz band).
North America
 cell 1 on channel 1
 cell 2 on channel 6
 cell 3 on channel 11
In North America you can create an installation as shown in the following figure.
Reducing transmission delays by using different operating frequencies in North America.
Available channels
1 to 11
1 to 14
1 to 13
Japan
 cell 1 on channel 1
 cell 2 on channel 7
 cell 3 on channel 14
Wireless configuration
Wireless coverage
Europe
 cell 1 on channel 1
 cell 2 on channel 7
 cell 3 on channel 13
3-5