Motorola MG8702 User Manual page 47

To configure and enable a Guest Network on the 5 GHz band, first
select the 5 GHz tab, and then repeat the steps above.
Network Name can be from 6 - 32 characters long. You can use the
upper and lower case letters (a – z and A – Z), numbers (0 - 9) and
special characters (e.g. $_/& etc.) except the single quote ' .
Password can be from 8 - 63 characters long. You can use upper and
lower case letters (a – z and A – Z), numbers (0 - 9) and special
characters (e.g. $_/& etc.) except the single quote ' .