Cisco Aironet 2700 Series - 80 MHz Channel Bonding Examples; 2-Stream Client Example at 80 MHz; Setting AP Channel Width for 80 MHz Links

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Cisco Aironet Series 2700/3700 Access Points Deployment Guide
Cisco Aironet Series 3700 Access Point
Figure 87 Example of a 2-ss Client Bonded at 80 MHz
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 Example of a Bonded 80 MHz Channel
Note For clients to link at 80 MHz, you have to set the channel width to 80 MHz on the AP.