Adtran solutions maximize performance, lower costs, and help companies achieve the best return on investment. Adtran is committed to achieving success for customers by offering "best-in-class" products with outstanding value. Let Adtran work for you.?he Adtran 1180006L1 Total Access 1500 Test Access Unit Module. Converts -48 VDC for all cards in Total Access 1500 system. Provides bantam jack to allow shelf installers test access to the metallic loops of a Total Access 1500 Chassis.