I agree. This is a ridiculous policy. My company has a dozen Netvanta 838s and I am unable to access technical documentation on input pairs over the DB25 connector so I can deploy it. Now I'm stuck sitting here waiting for a call back from an engineer to tell me something that should be readily available on the website.
I'm going to move our office to another vendor that supports their equipment.
Once your company was verified, your user profile on adtran.com shows that you should now have access to the documents.