Preface

Objectives and Reader Assumptions

This manual describes how to install and operate the COMSPHEREr Model 3920Plus standalone and Model 3921Plus carrier-mounted modems. Users of this manual must have a basic understanding of modems and their operation.

How to Use This Manual

Chapter 1 provides technical specifications, information about the four 392xPlus models, the modem features, and the government requirements for using these modems.

Chapter 2 provides instructions for installing the 392xPlus modems.

Chapter 3 provides the information required to operate the Model 3920Plus using the diagnostic control panel and the Model 3921Plus using the COMSPHERE 3000 Series Carrier's shared diagnostic control panel (SDCP).

Chapter 4 provides the information required to set configuration options in the 392xPlus modems using the modem's diagnostic control panel.

Chapter 5 provides instructions for using AT commands and S-Registers.

Chapter 6 provides instructions for using the Dial Access Security feature.

Appendix A provides a menu tree for the 392xPlus modems.

Appendix B provides instructions for performing diagnostic tests when data communication problems occur.

Appendix C provides EIA-232-D and VF TELCO pin assignments.

Appendix D provides V.25bis dialing information.

Appendix E provides an ASCII translation chart.

Appendix F provides a list of all default configuration options available for the factory preset configurations.

Appendix G provides diagrams of sample configurations for the 392xPlus modems.

Appendix H provides an equipment list for the 392xPlus modems.

The Glossary provides a description of terms used throughout this manual.

3920-A2-GN31-30

November 1996

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Paradyne 392xPLUS operation manual Preface, Objectives and Reader Assumptions, How to Use This Manual