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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: Provides interfaces that are independently configurable for DS-1, DSX-1, or PRI operation; Supports Drop/Insert and 1/0 Digital Cross-Connect (DACS) applications; Either T1 or PRI circuit can serve as timing source for system; Supports PRI switching applications; Supports Frame Relay applications; T1 ports provide additional bandwidth for T1 Inverse Multiplexing applications when used in conjunction with the NxT1 HSSI/V.35 or NxT1 HSSI module.