AT&T MERLIN LEGEND Installation & Maintenance Manual page 179

Installation
ability to turn off the Data-Set-Ready or Receive-Line-Signal
detect lead for a minimum of 50 ms when hanging up at the
termination of a data call
ability to turn on the Ring indicator lead for at least 100 ms in
the presence of an incoming analog call
supports Electronic Industries Association (EIA) signals CI
and CI2 if the modem is multispeed
Note: AT&T model 2224G (PEC 2224-CEO for stand-alone, PEC
2224-GED for rack-mounting arrangement) is recommended.
Option Settings Requirements
The options set on a modem and a data module in a modem
pool differ depending on whether the modem pool is digital-to-
analog or analog-to-digital.
Following are the options required for the modem and data
module for each type of modem pool. See the user manuals
provided with the modem and the ISDN 7500B Data Module for
instructions on how the options are set and the meaning of each
option.
Digital-to-Analog Modem Pool Option Settings
Data Module Option Settings. Use the following procedure to
prepare the ISDN 7500B Data Module for operation in a digital-
to-analog modem pool:
1. Use the instructions provided in the 7500B user manual to set
the DCE/DTE flip board to the DTE position.
2. Use the front panel controls on the 7500B to set the options
on the display (see Table 3-28). See the ISDN 7500B Data
Module user's manual for detailed information on using the
front panel controls and the meaning for each option.
Data Adapters 3-71