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.PRODUCT FEATURES:Rackmount design;Scalable network connectivity;1-5 T1 capacity (4 T1s and a Protect T1 for TR-08 applications utilizing a Quad LIU);Three common modules;Power Supply/Ring Generator Unit (PSU/RGU);System Controller Unit (SCU);Line Interface Unit (LIU);T1 Network Interface;18 slots for combination of voice and data services;Variety of access module units;Network management capabilities (TL1, SNMP);Multiple configuration arrangements;TR-08 compatible (Modes 1, 2, and 3);Supports Mechanized Loop Testing (MLT);NRTL Safety Listed and FCC compliant;Meets NEBS Level 3 requirements.