This table defines the specific features and firmware supported by each AOS based platform and applies to NetVanta and Total Access 900 products that run AOS (ADTRAN Operating System). Any feature(s) marked with a Ŧ symbol, indicates that certain restrictions may apply to the use of this feature with the associated unit. The matrix contains macros which must be enabled in order to use the search and sort features. You must download the file to use these new features but it is recommended to frequently check the web version as updates are continually posted. If you are logged in, you may also choose to subscribe to update notifications by selecting "Receive Email Notifications" at the right of the page under "Actions".