Lucent Technologies 7400B manual Operating Modes, Line or data mode, Character Formats

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DEFINITY Communications System

CHAPTER 3: FIRST TIME USERS

7400B Data Module

 

User’s Guide

Page 3-1

 

 

CHAPTER 3: FIRST TIME USERS

 

 

This chapter provides some basics on 7400B Data Module operation,

 

 

describes how to use a few AT commands that are essential for most data

 

 

communications operations, and then outlines a typical on-line session.

 

 

Note: The commands for the data module are referred to as AT

 

 

commands because you must type the letters “AT” as the

 

 

first characters on the line for most commands.

OPERATING MODES

 

 

Except when the 7400B Data Module is in a test mode, it is always in

 

 

one of two distinct operating states or modes: command mode and on-

 

 

line or data mode.

 

 

 

 

 

In command mode, the data module tries to interpret everything you

 

 

type on your keyboard as a command. In on-line mode, the data module

 

 

passes everything on as data.

 

 

 

 

While in on-line mode, typing a specific character three times in quick

 

 

succession (the factory-default escape sequence is 3 plus signs, or +++)

 

 

causes the data module to go into command mode without disconnecting

 

 

an active data call.

 

 

 

 

 

The operating modes, the escape sequence, and several AT commands

 

 

are explained further in Chapter 4, “Operation and Configuration.” All

 

 

AT commands are described fully in Appendix A, “AT Commands.”

 

 

 

 

Character Formats

In this context, character format refers to the form a character may take

 

 

locally, between the 7400B Data Module and your terminal device. The

 

 

elements that make up character format are often referred to as

 

 

communication parameters. Formats supported by the 7400B Data

 

 

Module are shown in Table 3-1.

 

 

 

 

 

 

 

 

 

 

Data Bits

Parity

Stop Bits

 

 

 

 

 

 

 

 

7

even or odd

1

 

 

 

7

mark or space

1

 

 

 

8

none

1

 

TABLE 3-1 CHARACTER FORMATS

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Contents AT&T 7400B Data Module To Order Copies of this Manual Contents Preface about this Guide 1C-1C-2C-5C-8 Typographical ConventionsOrganization of this GuideTroubleshooting. Describes procedures for Appendix C Application Notes. Contains notes on how toAppendix D Quick-Reference Summaries. Contains quick RelatedIntroduction External Features Front PanelConnector Description Front Panel LED Indicator DescriptionsRear Panel Connector Descriptions Rear PanelPower Supply Unit Hardware SoftwareRequirements Typical Standalone Installation Typical Installation with Telephone Installation Installation Selecting DIP-Switch Options With/Without Telephone Option SW1-1Installation Data Metering Option SW1-5Make Busy on Local Loop Option SW1-8 Factory-default Option DIP Switch SettingsTelephone SW1-1 Data Metering SW1-5Accessing the Hardware Option Switches Connecting the EIA-232-D Cable Connecting the Power SupplyPower-Up Self-Test If YOU are Using a PCIf YOU are Using a Dedicated TerminalLine or data mode Operating ModesCharacter Formats Data Bits Parity Stop BitsEssential AT Commands AT Command Description AT Command SubsetMore AT Command Subset Contd ConnectBusy Sample ON-LINE Session Starting the SessionNo Carrier Selection +++Operation and Configuration Configuration ParametersCommand Line Action Issuing Commands Command Line PrefixCommand Buffer Command Line Set UpAts3= ddd Enter Command AcknowledgementVerbose Form Numeric Description Result CodesFrom Data Mode to Command Mode and Back Dialing a Number Multiple CharactersFollowing is an example Commands for Using Stored Telephone Numbers At&z m=nnn...n EnterReset Configuration RecallRemote Site USE At&f Enter HOW to USE this ChapterSymptom Problem Solution PBXCheck Speed LED At&d2 Enter Terminate the local loopback test by typing Atq0 o Enter Atx4 Enter Appendix a AT Command SET LabelDescriptionContd Escape sequence Immediate None CommandA Arguments noneArguments none Registernone Examplea CommandD Command Function Switch hook control Command Function Type Arguments Register Example Comments Ato EnterAtv Enter A-10 User’s Guide Reset and recall a stored profile Data Carrier Detect DCD options Data Terminal Ready DTR options Command&F Arguments none Registernone ExampleAt&t3 Enter see comment At&v Enter Command&Y Registernone ExampleAt&z2=555-1212 Enter 055 Description Range Values Comments See Also Register Description StorableStorable Comments From a data terminal Register S6 not used Register S8 not used S9 not used Register S11 not used Register S13 not usedRegister Description Range Values Storable Comments See Also Register S15 not usedRegister S17 not used Values Storable Register S19 not used S20 not usedRegisterS21 Range of Values Storable Comments See AlsoBits 0 and 1 not used default = 2, see comment Register S24 not used Register S27 not used PBX Application Notes PC Applications Guide AT&T 7400B Data Module PC Application Guide, ordering numberConfiguring the Software Procomm PlusSelect Modem Options Select Result MessagesSelect Save Setup Options Placing a CallDisconnecting Call C-4Relay Gold Placing a Call DirectlySelect Call a Host Directory AttmailDisconnecting a Call Press Esc to return to the Online menu as shown belowCrosstalk Select the letter next to Hayes Smartmodem all modelsSelect the baud rate that you will use most often Bye Enter Appendix D QUICK-REFERENCE Summaries Command Description Table D-1 AT Command SETSr=n Table D-1 AT Command SET Contd Register Description Range/Unit Table D-2 S-REGISTER SummaryConnected Table D-3 Result CodesParameter Value AT Command Table D-4 FACTORY-DEFAULT ConfigurationR e Table D-4 FACTORY-DEFAULT Configuration Contd Parameter Value RegisterPin Circuit Direction Function Table D-5 EIA-232-D PIN AssignmentsAscii Control KEY Value Character Table D-6 Ascii Character SETTable D-6 Ascii Character SET Contd Glossary Glossary Script files. See command files Index DTE, see Data Terminal Device DTR lead Data MeteringRear panel, 1-4Remote site use AT&T Important Safety Instructions Page Important Installation Safety Instructions

7400B specifications

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In summary, the Lucent Technologies 7400B stands out for its advanced signal processing, voice encoding capabilities, reliability features, and scalability. These characteristics make it a vital component for any organization looking to enhance their telecommunications infrastructure and meet the increasingly complex communication needs of today’s digital landscape.
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