Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual download pdf (Page 59)

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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

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

Table 7-2, 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

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Cisco WIRELESS LAN CONTROLLER OL-17037-01 User Manual Page 59