Wireless Access Point
336 Configuring the Wireless AP
• Non-Radar: give preference to channels that are not required to use 
dynamic frequency selection (DFS) to avoid communicating in the 
same frequency range as some radar (also see Step 8 on page 320). 
• Negotiate: negotiate air-time with other APs before performing a full 
scan.
Channels Required to Use DFS Radar Avoidance in USA
36+40 Non-radar  116  DFS required 
44+48 Non-radar  132+136 DFS required
52+56  DFS required 140+144 DFS required
60+64 DFS required 149+153 Non-radar
100+104 DFS required  157+161  Non-radar
108+112 DFS required 165 Non-radar
Channels Required to Use DFS Radar Avoidance in 
Europe
36+40 Non-radar  116+120* DFS required 
44+48 Non-radar  124*+128* DFS required 
52+56  DFS required 132+136  DFS required
60+64  DFS required  140+144 DFS required
100+104 DFS required  149+153  Non-radar
108+112 DFS required 157+161  Non-radar
* Channels 120, 124, 128 use a 
10 minute Channel Availability Check 
(CAC) time in Europe 
165 Non-radar