Data Communications Hardware - AT&T MERLIN LEGEND Data Manual

Data Communications Hardware

ISDN 7500B Data Module
ISDN 7500B Data Modules and modems connect data terminal equipment
(DTE) such as a PC, printer, optical scanner, local host computer, or LAN
workstation to the communications system.
This chapter explains how data modules and modems work, how they connect
to the system, how to configure them, and the features they offer.
The Integrated Services Digital Network (ISDN) 7500B Data Module connects
digital data terminal equipment to the system via a 008 MLX module on the
system. Unlike a modem, which converts digital data signals to analog signals, a
data module transmits digital data to other digital stations.
The data module provides an RS-232 interface for asynchronous transmission
from DTE at speeds of up to 19.2 kbps. It can also provide a V.35 interface for
synchronous transmission at speeds of up to 64 kbps if you order a separate
board.
Figure 2-1 shows the following on the lSDN 7500B Data Module's front panel:
POWER/TEST LED. Lights when power is supplied and flashes when tests
are made.
DATA LED. Flashes when a data call comes in and lights when a call is in
progress; flashes when tests are made.
Display. Shows status information and option settings.
NEXT, BACK, and ENTER buttons. Used to operate the data module and to
adjust the screen's contrast.
Figure 2-1 also shows the following on the underside of the ISDN 7500B Data
Module's top cover:
DCE/DTE Flip Board. Used to select whether the data module operates with
data terminal equipment connected directly or as part of a modem pool.
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ISDN 7500B Data Module
2-1