ix3910-A2-GN32-40 September 1998
Preface

Objectives and Reader Assumptions

This manual describes how to install and operate the COMSPHEREr 391x Series standalone and
carrier-mounted modems. This manual assumes that you have a basic understanding of modems
and their operation.

How to Use this Manual

Chapter 1 provides technical specifications, information about the 391x Series modems’ features,
and the government requirements for using these modems.
Chapter 2 provides instructions for installing the 391x Series modems.
Chapter 3 provides the information required to operate the Model 3910 using the diagnostic
control panel (DCP) and the Model 3911 using the COMSPHERE 3000 Series Carrier’s shared
diagnostic control panel (SDCP).
Chapter 4 shows how to use the Status branch of the front panel menu to monitor the status of the
modem and view identity information.
Chapter 5 provides the information required to set configuration options in the 391x Series
modems using the modem’s diagnostic control panel.
Chapter 6 describes the Poll List Branch of the DCP menu.
Chapter 7 describes the Control Branch.
Chapter 8 describes the Test Branch.
Chapter 9 describes the Sub-Network Health and Status Branch.
Chapter 10 describes the Call Setup Branch.
Chapter 11 describes the Talk/Data Branch.
Chapter 12 provides instructions for using the Dial Access Security feature.
Chapter 13 describes how to control a remote modem using the Remote Branch.
Chapter 14 provides instructions for displaying and changing AT commands and S-Registers.
Appendix A provides a menu tree for the 391x Series modems.
Appendix B provides instructions for performing diagnostic tests when data communication
problems occur.