Motorola MG7550 User Manual page 41

If there are very few neighboring wireless devices in your location, you
should follow the rule of choosing a channel separated by 5 from all other
channels. For example, if there are two neighboring networks using channels
6 and 11, you should choose channel 1.
If there are many neighboring networks, you may find that most use
channels 1, 6 and 11. In that case, you may find you achieve better
performance by choosing an unused channel between the most-used
channels, for example one of channels 3, 4, 8 or 9. You may need to
experiment to find the best channel. Note good candidate channels to use
for your network. Then, navigate to the Wireless Basic page.
For the 5 GHz band:
Look at the Channel column. This shows the channels that your neighboring
networks use. Available channels include 36 – 48 and 149 – 165. Some
channels from 52 – 144 may also be available; however, these channels may
be allocated to uses including weather RADAR and other government
sanctioned applications.
As of this writing (spring of 2016) it is unusual for the 5 GHz band to be
crowded. If it is crowded in your location, choose a channel or channels that
are unused or little used by neighbors. Then, navigate to the Wireless Basic
page.
Hover over the Wireless menu item to bring the Wireless submenu options
into view, then click the Basic submenu option. This brings you to the
Wireless Basic page: