Chapter 1. Introduction
7
May 2011
Chapter 1. Introduction
1.1 General
The ETU-01A provides an economical digital access solution for E1 and Fractional E1
network services. User replaceable Data I/F Modules provide a wide range of industry standard
interfaces to DTE devices, which may be linked to an ETU-01A at data rates of 56Kbps to
2048Kbps.
The ETU-01A supports local control and diagnostics via the LCD display, keypad and LED
status indicators located on the front panel, via the RS-232 control port connection or via optional
SNMP. The SNMP option provides Simple Network Management Protocol System functions over a
10BASE-T connection, which allow the user to remotely control, diagnose, and monitor the system.
These features enable users to easily configure the unit, execute the loop back/BERT functions and
monitor the network status either locally or remotely.
The ETU-01A operates from 90~250VAC, 18 to 72VDC or with a dual power model, both AC
and DC. The unit is built in a compact case that can be placed on desktops and shelves or installed,
by means of an appropriate adapter, in a 19" EIA rack.
At the time of this printing, the ETU-01A has nine types of user-replaceable data channel modules.
1. ETU/TTU-V35
V.35 Module:
Provides one fully compliant ITU-T V.35 interface on a Female
"M" block (Winchester), 34 pin connector. Operates at any n56/n64
fractional or unframed E1 speed.
2. ETU/TTU-530
RS-530 Module:
Provides one fully compliant EIA RS-530 interface on a female "D-
Sub" type 25 pin connector. Operates at any n56/n64 fractional or
unframed E1 speed.
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