AT&T MERLIN LEGEND Installation & Maintenance Manual page 165

Installation
DATA LED. Flashes to indicate an incoming data call and
lights when a call is in progress; flashes when 7500B tests
are performed.
Display. Displays status information and option settings.
NEXT, BACK, and ENTER buttons. Used to operate the
75008 and to adjust the screen's contrast.
The 7500B back panel has the following (see Figure 34).
PHONE jack. Connects a digital/ISDN (MLX) telephone to the
7500B.
LINE jack. Connects the 7500B to an MLX system module.
POWER connector. Connects the 7500B to the DC power
supply, which connects to an AC outlet.
PORT 1. Connects the 7500B to a data terminal, computer, or
modem.
PORT 2. When an enhancement board is installed for
synchronous operation, Port 2 connects a second data
terminal, an automatic calling device (with an RS-366
interface), or a data terminal with a V.35 interface.
Note: A modem can provide an analog data interface from an
MLX telephone that has an MFM installed.
When you use the ISDN 7500B Data Module with an MLX
telephone, plug one end of the D8W cord into the PHONE jack
on the 7500B and the other end of the cord into the LINE jack on
the MLX telephone.
The maximum cord length from the 7500B to the telephone
cannot exceed 80 feet.
The MLX telephone cannot be used to dial data calls, and the
data module cannot be used to dial voice calls. Each device
Data Adapters 3-57