Thank you for asking this question in the support community forum. Here are some reference articles for you:
Here is the product page: http://www.adtran.com/web/page/portal/Adtran/product/1202361L2
Unfortunately, if you do not know the IP address of the unit, you will have to console into the unit and change the IP address. Here are steps about how to change the IP address, and enable the Web interface: Accessing the Web Interface in AOS
Please, let me know if you have any additional questions.