ADC 77115 T-Serv II T1 Channel Service UnitThe T SERV II CSU is a proven, cost effective Channel Service Unit (CSU) for terminating T1 and PRI circuits. Offering high reliability and flexible configuration options, the T SERV II is available as a stand alone device or as a plugin card for multiple T1 PRI connections. All basic CSU functions are contained in the T SERV II CSU, including bipolar violation (BPV) correction, line build out, loop code generator for fault isolation, front panel LED