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Chapter 1. Introduction
61200420L1-1 ESU 120e User Manual
1-3
Option Module Architecture
The ESU 120e features a unique architecture that allows the addi-
tion of one option module and plug-on board providing an oppor-
tunity for growth to accommodate another application.
ESU 120E CONFIGURATION APPLICATIONS
The following examples illustrate possible configurations of
ESU 120e applications.
Router, PBX Application
In this application, the base Nx54/64 provides a V.35 interface to a
router. The PBX is interfaced to the ESU 120e with the base drop
interface. The 10BaseT port allows SNMP network management
over the LAN. See Figure 1-1.
Figure 1-1. Router, PBX, Application Set Up
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SHIFT
COPY
ALARM
CLEAR
ESU 120e
7
2
5
8
0
#
3
6
9
HOME
ENTER
CANCEL
DSU
/DSX
OK
TEST
ALARM
M
O
DU
L
E
OK
TEST
ALARM
CSU
OK
TEST
ERROR
ALARM
PBX
10 BaseT LAN
SNMP NETWORK
MANAGEMENT WORKSTATION