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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 7 Controlling Lightweight Access Points
Using the W56 Band in Japan
Using the W56 Band in Japan
The Japanese government is formally permitting wireless LAN use of the frequencies in the W56 band
for 802.11a radios. The W56 band includes the following channels, frequencies, and power levels (in
dBm):
All of the channels in the W56 band require dynamic frequency selection (DFS). In Japan, the W56 band
is subject to Japan’s DFS regulations. Currently, only the new 1130 and 1240 series access point SKUs
(with the -Q product code) support this requirement: AIR-LAP1132AG-Q-K9 and
AIR-LAP1242AG-Q-K9.
To set up a network consisting of only -P and -Q access points, configure the country code to J2. To set
up a network consisting of -P, -Q, and -U access points, configure the country code to J3.
Dynamic Frequency Selection
The Cisco UWN Solution complies with regulations that require radio devices to use dynamic frequency
selection (DFS) to detect radar signals and avoid interfering with them.
When a lightweight access point with a 5-GHz radio operates on one of the 15 channels listed in
, the controller to which the access point is associated automatically uses DFS to set the
operating frequency.
When you manually select a channel for DFS-enabled 5-GHz radios, the controller checks for radar
activity on the channel for 60 seconds. If there is no radar activity, the access point operates on the
channel you selected. If there is radar activity on the channel you selected, the controller automatically
selects a different channel, and after 30 minutes, the access point retries the channel you selected.
Note
After radar has been detected on a DFS-enabled channel, it cannot be used for 30 minutes.
Channel
Frequency (MHz)
Maximum Power for
AIR-LAP1132AG-Q-K9
Maximum Power for
AIR-LAP1242AG-Q-K9
100
5500
17
15
104
5520
17
15
108
5540
17
15
112
5560
17
15
116
5580
17
15
120
5600
17
15
124
5620
17
15
128
5640
17
15
132
5660
17
15
136
5680
17
15
140
5700
17
15
