AT&T 7400B Plus User Manual page 9

DEFINITY Communications System
7400B Plus Data Module
User´s Guide
Additional features of the 7400B Plus include the following:
non-volatile, read-write memory for storing two data
options profiles and up to four telephone numbers
an ''AT'' command interface that emulates a Hayes 2400
Smartmodem and supports the following:
storage of the wait time for carrier detect interval (S7
register)
voice call origination using the ''ATDP'' command
automatic speed and parity adjustment
even, odd mark, space or no parity
automatically adjusts data throughput
power-up self-test
local and remote loopback tests with test duration timers
voice terminal powered by the PBX is not affected if ac
power is removed from the 7400B Plus
CHAPTER 1: INTRODUCTION
Page 1-3