AT&T 7400B Plus User Manual page 13

DEFINITY Communications System
7400B Plus Data Module
User´s Guide
Power Supply Unit A separate power supply unit is shipped with the 7400B Plus.
This unit connects between a grounded AC outlet and the
''POWER'' connector at the rear of the 7400B Plus. This power
supply unit provides the necessary operating voltages for the
7400B Plus.
Caution: Make certain that the AC outlet to which you connect
the power supply is unswitched (for example, not
controlled by a wall switch or light dimmer).
Instructions for installing the power supply unit with an
illustration are provided in the hardware installation section of
Chapter 2, "Installation."
CHAPTER 1: INTRODUCTION
Page 1-7