Specifications

Features
Though functionally similar to commercial modems, the MD1980C provides the following unique features that
make it well suited for utility and industrial applications.
 Requires only one rack slot.
 Operates over voice-band conditioned or unconditioned leased line and pilot wires.
 Operates without human intervention, making it ideal for unmanned locations.
 Works within an extended temperature range of -40ºC to +85ºC.
 Designed with coupling transformers for high-voltage isolation and common mode noise rejection in industrial
and commercial environments.
 Asynchronous data rates (selectable) of 9600, 4800, and 0-1800 bps.
 Easily accessible DIP switches for user configuration and option selection.
 Local analog, local digital, and remote digital loopback diagnostics.
Applications
The BLACK BOX® MD1980C modem is designed for point-to-point and multipoint data communications. Figure
1-1 shows a typical multipoint configuration.
Figure 1-1. Network of Multipoint Configuration
There are a number of factors that can affect the network’s and modem’s operation and performance. These include:
 Operating speed
 2-wire or 4-wire configuration
 Transmission line characteristics, noise, and line impairments
 Network configuration (point-to-point or multipoint)
 Number of nodes on the network
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