Using The W56 Band In Japan; Dynamic Frequency Selection - Cisco 2100 Series Configuration Manual

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):
Channel
100
104
108
112
116
120
124
128
132
136
140
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
Table
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.
After radar has been detected on a DFS-enabled channel, it cannot be used for 30 minutes.
Note
Cisco Wireless LAN Controller Configuration Guide
7-58
Frequency (MHz)
5500
5520
5540
5560
5580
5600
5620
5640
5660
5680
5700
7-2, the controller to which the access point is associated automatically uses DFS to set the
Chapter 7
Maximum Power for
AIR-LAP1132AG-Q-K9
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Controlling Lightweight Access Points
Maximum Power for
AIR-LAP1242AG-Q-K9
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