ADTRAN 1200410L1, User Manual

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61200410L1-1B ESU LT User Manual 17
Chapter 1
Introduction
ESU LT OVERVIEW
This section provides a functional description of the ESU LT,
describes its features, and illustrates its four interfaces.
Functional Description
The ADTRAN ESU LT(Figure 1-1) is one of several E1
CSU/DSUs that offer complete flexibility for connection of
various data sources to E1 or FE1 facilities. This family of
ESU products includes the following:
• ESU LT - E1 CSU/DSUs with a single Nx56K/64K serial
port.
• ESU 120e - Same as the ESU LT with the added feature of
a G.703 drop port and a slot in the rear panel to house an
option module. Each module offers up to four additional
data ports.
Figure 1-1. ESU LT Unit
PWR
TEST
ALM ERR
TD
CS RS
RD
CANCEL
ENTER
ESU LT