
Introduction
1-3
3170-A2-GB20-30
March 1999
Physical Description
The E1 DSU/CSU series of products consists of a
Model 3172 DSU/CSU (2-port) and a Model 3174
DSU/CSU (4-port).
Front Panel
The E1 DSU/CSU front panel (Figure 1-1) contains,
•
One 2-line, 16-alphanumeric-character-per-line
liquid crystal display (LCD)
•
One 7-button keypad (three Function and four
directional keys)
•
Twelve light-emitting diodes (LEDs)
•
Six test jacks
Rear Panel
The E1 DSU/CSU rear panel contains the connectors
and switches required for the operation of the E1
DSU/CSU (
Figures 1-2
and
1-3
). The connectors and
switches are described in
Table 1-1
.
F1
F2
F3
OK
FAIL TEST
SIG
OOF ALRM
NETWORK
RXD
EER
SIG
ALRM PDV
OOF
BPV
LCD
ACCULINK
In
Out
In
Out
In
Out
NET
NET
MON
EQPT
MON
DTR
TXD
CTS
RTS
496-14539-03
KEYPAD
TEST JACKS
LEDs
Figure 1-1. Front Panel
Содержание 3172
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