Adtran Atlas 550 Manual and Support Forum - Registration

Quick find from Optimumdata (excellent quality and service - by the way...):

http://www.optimumdata.com/shop/files/adtran/atlas550/atlas550.pdf

Adtran Atlas 550 Support Forum

http://kb.adtran.com/display/2n/index.asp?c=12&cpc=BrduHgTSN7q8U34W3REU5Gb07vRy0ko8jy4dp5CbvV82dL&cid=2&cat=1068&catURL=kb%3D1%26L1cid%3D1007%26L2cid%3D1020%26L3cid%3D1068%26level%3D4%26&r=0.9028437