61200410L1-1 ESU LT User Manual 1-1Chapter 1 IntroductionESU LT OVERVIEWThis section provides a functional description of the ESU LT,describes its features, and illustrates its four interfaces.Functional DescriptionThe ADTRAN ESU LT is one of several E1 CSU/DSUs thatoffer complete flexibility for connection of various datasources to E1 or FE1 facilities. This family of ESU productsincludes the following:• ESU LT - E1 CSU/DSUs with a single Nx56K/64K serialport.• ESU 120e - Same as the ESU LT with the added feature ofa G.703 Drop port and a slot in the rear panel to house aoption module. Each module offers up to four additionadata ports.Figure 1-1. ESU LT Unit - Front ViewPWRTESTALMERRTDCSRSRDCANCEL ENTERESU LT
