Chapter 1. Introduction61200.129L1-1 TSU 120 User Manual 1Chapter 1IntroductionTSU 120 OVERVIEWA functional description of the T1 multiplexers, adescription of the TSU 120 rear panel, and a summaryof the features of the TSU 120 is provided in thissection. The unit is shown in Figure 1-1.OK TEST ALARMOK TEST ALARMOK TEST ERROR ALARMDSU/DSXMODULECSU321 654 987 #0*CBA FED CLEARALARMREMOTEREMOTESHIFTHOMECOPYCANCELTSU120ENTERFigure 1-1Front View of the TSU 120Functional DescriptionThe ADTRAN TSU 120 is one of several T1 multiplex-ers that offers complete flexibility for connection ofvarious data sources to T1 or FT1 facilities. Thisfamily of TSU multiplexers includes the TSU, TSU 100,TSU 120, and the TSU 600.TSUThe TSU is a T1 CSU/DSU with a single Nx56/64serial port.
