Brocade Mobility 7131N-FGR Access Point Product Reference Guide (Supporting software release 4.0.0.0-35GRN and later) - Manual (Page 157)

Brocade Mobility 7131N-FGR Product Reference Guide 145
53-1001947-01
Enabling Wireless LANs (WLANs)
5
Channel Selection The following channel selection options exist:
User Selected - This is the default setting. If 20/40 MHz is selected
as the Channel Width (supporting 11n), the Secondary Channel
drop-down menu becomes enabled. The user must define the
primary channel first. Then, depending on the primary channel
defined, the secondary channel list is filled with channels making
the combination of primary and secondary channels valid. The
actual channels available depend on regulatory domain
requirements.
Automatic - When the access point is booted, the access point
scans non-overlapping channels listening for beacons from other
access points. After the channels are scanned, it will select the
channel with the fewest access points. In the case of multiple
access points on the same channel, it will select the channel with
the lowest average power level.
The Random option is available for use with the 802.11a/n radio.
To comply with Dynamic Frequency Selection (DFS) requirements
in the European Union, the 802.11a/n radio uses a randomly
selected channel each time the access point is powered on.