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MD1970A
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User Manual
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Black Box MD1970A, MD1970C, MD1970A-DC User Manual

February 2004 0049-0119-500
MD1970A / MD1970A-DC /MD1970C Modem
Contents
Jumper S1 − Carrier Detect Control...........................................................................................................9
Jumper S2 − Transmit Level........................................................................................................................9
Jumper S3 − 2-wire/4-wire Mode................................................................................................................9
Jumper S4 − Call Turnaround Squelch .......................................................................................................9
Jumper S5 − Transmit Carrier ..................................................................................................................10
Jumper S6 − Local Copy ...........................................................................................................................10
Jumper S8 − Signal and Earth Ground .....................................................................................................10
Jumper S9 − RTS-CTS Delay ....................................................................................................................10
Jumper S10 − Carrier Detect Delay..........................................................................................................11
Jumper S11 − Turnaround Squelch Time..................................................................................................11
Jumper S12 − Soft Carrier Turn Off..........................................................................................................11
Jumper S13 − Anti-Streaming ...................................................................................................................11
Jumpers S14 and S15 − Self Test or Test Pattern......................................................................................12
Connecting to a DC Power Source (MD1970A-DC) ................................................................................12
Connecting to an AC Power Source (MD1970C) .....................................................................................13
APPENDIX A COMPLIANCES .........................................................................................................................20
FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT ..............................................................................20
FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF
OMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS ...........................................................21
C
Page ii
Chapter 1
Introduction
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.
T
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.
Page 3
Installing the Modem
Chapter 2
Installing the Modem
his chapter describes how to install the modem.
T
Site Preparation
The location where you install your modem should be:
• Within six feet of a 115 or 230 VAC grounded outlet not controlled by a wall switch
• No more than 50 feet from the data terminal equipment
• Away from extremes of temperature, humidity, and appreciable shock.
Note:
Be sure that there is a 4-inch minimum space at the back of the modem for signal line and interface cable clearance.
Unpacking Your Hardware
Your package should include at least one MD1970A or MD1970C modem, one RJ-45 jack-to-4 wire leased line cable, and this Installation Guide. If your package contents are damaged or missing, please contact your place of purchase immediately.
Additional Items You Need
To use your modem, you need the following additional items:
All users: an RS-232 cable to connect a data terminal. The cable must conform to the pin assignments shown on
page 19.
Standalone modem users: a two- or four-wire transmission line or leased line and power supply.
Rack-mount modem users: a modem rack and an available slot in the rack for installing the modem.
Hardware Overview
Figures 2-1, 2-2, and 2-3 show the front and back modem panels.
Page 4
Installing the Modem
Figure 2-1. Front Panel
Figure 2-2. Back Panel
On the front panel of the modem, there are:
One Power LED and six status LEDs (see page 14)
A rotary test switch (see page 14)
On the back panel of the BLACK BOX® MD1970A modem, there are:
A power cord or power input connector
A power switch for turning the modem on and off
A fuse, 3/8 amp, 250 Volt, slow-blow
A DB25 female connector for accommodating a DTE device
An RJ-45 connector for connecting to a communications line
On the back panel of the MD1970A-DC modem, there are:
A power switch for turning the modem on and off
A fuse, 1.5 amp
A DC power connector
A DB25 female connector for accommodating a DTE device
An RJ-45 connector for connecting to a communications line
Page 5
Installing the Modem
Configuring the Modem
The modem obtains some operating characteristics from jumper settings. The default jumper settings are for common 4-wire full-duplex applications. To reconfigure the modem for 2-wire half-duplex and special applications, you must change the default jumper settings.
To change jumper settings, push the two tabs on the back of the modem to open the modem cover and gain access to the jumper settings on the printed circuit board (see Figure 2-4). Then set the jumpers to the desired settings and replace the cover.
Figure 2-4. Gaining Access to the Modem Jumpers
Figure 2-5 on the next page shows the location of the modem jumpers. Table 2-1 on page 8 summarizes the jumper settings (default settings are bold).
Page 6
Installing the Modem
Figure 2-5. Modem Jumper Locations
Page 7
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