Cisco Aironet 3700 Series Deployment Manual page 64

Cisco Aironet Series 3700 Access Point
Figure 87
Notice that the software reports channel is 36 (that is where the channel bonding starts). On a spectrum
analyzer, we see that the actual channels in use are 36, 40, 44, and 48.
Figure 88
For clients to link at 80 MHz, you have to set the channel width to 80 MHz on the AP.
Note
Cisco Aironet Series 2700/3700 Access Points Deployment Guide
64
Example of a 2-ss Client Bonded at 80 MHz
Example of a Bonded 80 MHz Channel