HP 530 Management Manual page 159

Summary Point
Because they are in different parts of the spectrum, the channels
within these modes do not interfere with one another.
Each radio that is used, no matter what the mode, must be set to
a unique channel to avoid interference with other radios in the
same area.
There is much channel overlapping in these modes because they
are in the same 2.4 GHz spectrum and use the same channels. To
avoid overlapping, there must be a separation of at least five
channels between operating channels (for example, channels 1,
6, 11).
There is a maximum of three nonoverlapping channels (for
example, channels 1, 6, 11 for the U.S.) (for example, channels 1,
7, 13 for Europe).
In 802.11a mode, in the 5 GHz to 6 GHz spectrum, all channels are
nonoverlapping and will not interfere with each other.
If your environment does not contain legacy 802.11b stations or
legacy access points, you can obtain maximum throughput by
configuring pure-G Mode(s).
See "Web: Configuring Advanced Radio Settings" on page
Dual 802.11b/g Configuration & External Antennas
For dual 2.4 GHz (B/G) radio operation, it is best to operate on Channel 1 and Channel 11.
For dual B-B mode operation, the external antenna must be placed 12 inches or more away
from the center of the AP for no throughput degradation.
For mixed-mode B-G or G-B operation, the external antenna must be placed 33 inches or more
away from the center of the AP for no significant throughput degradation.
For dual G-G mode operation, the external antenna must be placed 57 inches or more away
from the center of the AP for no throughput degradation.
Greater external antenna to AP separation is required for operating on Channel 6 and
Channel 11.
Greater external antenna to AP separation is required for operating on Channel 1 and
Channel 6.
Greater external antenna to AP separation is required for operating on Channel 6 and
Channel 11.
*Please refer to the specific product antenna manuals for detailed specifications.
Wireless Interface Configuration
Configuring the Radio
Parameters
802.11b and 802.11a
channels.
802.11g and 802.11a
channels.
All modes (802.11a,
802.11b, and 802.11g).
Avoid channel
interference between the
802.11b and 802.11g
modes by separating the
operating channels at
least five channels apart.
No channel interference
in 802.11a mode.
- B + G stations to the
access points only and
protected mode enabled.
6-14. - Wifi G stations only and
protected mode enabled.
- Pure-G stations only and
protected mode disabled.
6-7