Chapter 1
Introduction
T
he BLACK BOX® MD1970A standalone modem and MD1970C rack-mount modem are Frequency Shift
Keyed (FSK) modems designed for asynchronous half-duplex communication on 2-wire private line circuits
or full-duplex communication on 4-wire private-line circuits.
Summary of Key Features
The following list summarizes the modem’s key features.
•
Bell 202T compatible
•
Operates over voice-grade leased lines or private lines
•
0 to 1200 bps operation for unconditioned line.
•
0 to 1800 bps operation for conditioned line (C2).
•
Point-to-point or point-to-multipoint polling network
•
4-wire full-duplex or 2-wire half-duplex leased-line configuration.
•
Analog Loopback Test, Digital Loopback Test, Self Test, and Test Pattern Transmit.
•
LED displays for power, RS-232 control, data status, and test mode.
Models
The BLACK BOX® modems are available in three models:
The MD1970A is a desktop modem that comes with an AC power adapter for 115/230 VAC.
The MD1970A-DC is a desktop modem that uses DC power.
The MD1970C is a rack-mount modem that installs into a standard 19-inch rack.
In this manual, the term “modem” will be used to refer to both models collectively. If information pertains to one
model only, that model will be identified by its model number.
Using This Manual
This manual contains all the information you need to install, configure, use, and test your modem.
Chapter 1 contains general information on what the modem does, contents of this manual, and contact
information for Black Box.
Chapter 2 describes how to install and configure the modem.
Chapter 3 provides general operating procedures.
Chapter 4 provides troubleshooting procedures.
Chapter 5 lists the modem’s specifications.
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