Lucent Technologies DEFINITY Installation For Adjuncts And Peripherals page 50

DEFINITY ECS Release 8.2
Installation for Adjuncts and Peripherals 555-233-116
4 Data Modules and Asynchronous Data Units
Sett Hardware Options
Setting 7400A Data-Module Hardware Options
Most configuration options are controlled by commands entered on the front
panel of the 7400A. But you have to make hardware changes when you want to
set up the 7400A data-module for use in a modem pool or as a piece of data
communications equipment. In a modem-pool, the data module operates as
data-terminal equipment (DTE). In most other applications, it functions as data
communications equipment (DCE). You have to set the correct operating mode
for the data module before you can access the menus for the remaining
configuration tasks.
To change the operating mode of the 7400A from DCE to DTE (or vice versa), you
change the position of a small circuit board (the Electronic Industries Association
connector board) inside the case. See
!
WARNING:
Electrostatic discharge can severely damage sensitive electronic circuits.
Before handling any electronic hardware, be sure to wear a grounding wrist
strap or other static-dissipating device. Do not touch exposed circuitry or
semiconductor chips.
1. Unplug the data module from the power receptacle.
2. Remove the access panel on the top of the case by grasping the rear lip
of the panel and pulling sharply upward.
3. While facing the front of the data module, locate the small EIA connector
circuit board. It sticks up vertically, and a large, silver arrow on the main
circuit board points to it.
Figure 11 and proceed as follows.
Issue 1
April 2000
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