Lucent Technologies 7400B manual Issuing Commands, Command Line Prefix, Command Buffer

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DEFINITY Communications System

CHAPTER 4: OPERATION AND CONFIGURATION

7400B Data Module

 

User’s Guide

Page 4-3

 

 

 

 

In command mode, the 7400B Data Module looks at everything you

 

 

type on your keyboard. When you type in something that the data

 

 

module recognizes as a valid command with a valid parameter (if

 

 

required), it will execute the action requested. A valid command with

 

 

an invalid parameter will produce the ERROR result code, and an invalid

 

 

command is simply ignored.

 

 

In on-line mode, everything you type is passed as data without

 

 

interpretation by the 7400B Data Module, except the escape sequence.

 

 

The escape sequence, described in later paragraphs, provides a way of

 

 

switching the data module back to command mode without

 

 

disconnecting a data call.

ISSUING COMMANDS

 

The following paragraphs describe the elements of a command line and

 

 

how the 7400B Data Module responds to a command line when it is

 

 

issued.

Command Line Prefix

 

All commands issued to the 7400B Data Module, except the escape

 

 

sequence and the repeat command, must begin with the letters “AT”.

 

 

This is called the command line prefix and must be entered as either

 

 

both uppercase or both lowercase letters (that is, at and AT will work,

 

 

but aT or At will not).

 

 

The AT prefix (also known as the AT tention command) alerts the data

 

 

module to expect one or more commands to follow. Each time the AT

 

 

prefix is sent, the data module adjusts its speed and parity to match your

 

 

local terminal.

 

 

 

Command Buffer

As you type in a command, each character is saved in a 40-character

 

 

buffer. The AT prefix, spaces, and the [ Enter ] at the end of the command

 

 

line are not saved and do not add to the character count. If you try to

 

 

type more than 40 countable characters on one line, the result code

 

 

ERROR will be displayed on your terminal screen, and the command

 

 

line will be ignored.

Command Line Set Up

 

A command line begins with the AT prefix, includes one or more

 

 

commands, and finishes with a line termination, usually issued by

 

 

pressing the [ Enter ] key. The factory-default line termination character

 

 

is an ASCII carriage return, represented by the decimal number 013

 

 

stored in S-register S03.

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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 Conventions TypographicalOrganization of this GuideAppendix C Application Notes. Contains notes on how to Troubleshooting. Describes procedures forAppendix D Quick-Reference Summaries. Contains quick RelatedIntroduction Front Panel External FeaturesFront Panel LED Indicator Descriptions Connector DescriptionRear Panel Rear Panel Connector DescriptionsPower Supply Unit Hardware SoftwareRequirements Typical Standalone Installation Typical Installation with Telephone Installation Installation With/Without Telephone Option SW1-1 Selecting DIP-Switch OptionsInstallation Data Metering Option SW1-5Make Busy on Local Loop Option SW1-8 Option DIP Switch Settings Factory-defaultTelephone SW1-1 Data Metering SW1-5Accessing the Hardware Option Switches Connecting the EIA-232-D Cable Supply Connecting the PowerIf YOU are Using a PC Power-Up Self-TestIf YOU are Using a Dedicated TerminalOperating Modes Line or data modeCharacter Formats Data Bits Parity Stop BitsEssential AT Commands AT Command Description AT Command SubsetMore Connect AT Command Subset ContdBusy Starting the Session Sample ON-LINE SessionSelection +++ No CarrierConfiguration Parameters Operation and ConfigurationCommand Line Action Command Line Prefix Issuing CommandsCommand Buffer Command Line Set UpAts3= ddd Enter Acknowledgement CommandVerbose Form Numeric Description Result CodesMultiple Characters From Data Mode to Command Mode and Back Dialing a NumberFollowing is an example At&z m=nnn...n Enter Commands for Using Stored Telephone NumbersReset Configuration RecallRemote Site USE At&f Enter Chapter HOW to USE thisPBX Symptom Problem SolutionCheck Speed LED At&d2 Enter Terminate the local loopback test by typing Atq0 o Enter Atx4 Enter LabelDescription Appendix a AT Command SETContd Escape sequence Immediate None CommandA Arguments noneArguments none Registernone Examplea CommandD Command Function Switch hook control Ato Enter Command Function Type Arguments Register Example CommentsAtv Enter A-10 User’s Guide Reset and recall a stored profile Data Carrier Detect DCD options Data Terminal Ready DTR options Arguments none Registernone Example Command&FAt&t3 Enter see comment At&v Enter Registernone Example Command&YAt&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 S13 not used Register S11 not usedRegister S15 not used Register Description Range Values Storable Comments See AlsoRegister S17 not used Register S19 not used S20 not used Values StorableRange of Values Storable Comments See Also RegisterS21Bits 0 and 1 not used default = 2, see comment Register S24 not used Register S27 not used AT&T 7400B Data Module PC Application Guide, ordering number PBX Application Notes PC Applications GuideProcomm Plus Configuring the SoftwareSelect Modem Options Select Result MessagesPlacing a Call Select Save Setup OptionsC-4 Disconnecting CallRelay Gold Placing a Call DirectlySelect Call a Host Attmail DirectoryPress Esc to return to the Online menu as shown below Disconnecting a CallSelect the letter next to Hayes Smartmodem all models CrosstalkSelect 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 Table D-2 S-REGISTER Summary Register Description Range/UnitTable D-3 Result Codes ConnectedParameter Value AT Command Table D-4 FACTORY-DEFAULT ConfigurationR e Parameter Value Register Table D-4 FACTORY-DEFAULT Configuration ContdTable D-5 EIA-232-D PIN Assignments Pin Circuit Direction FunctionTable D-6 Ascii Character SET Ascii Control KEY Value CharacterTable D-6 Ascii Character SET Contd Glossary Glossary Script files. See command files Index Data Metering DTE, see Data Terminal Device DTR leadRear panel, 1-4Remote site use AT&T Important Safety Instructions Page Important Installation Safety Instructions

7400B specifications

The Lucent Technologies 7400B is a notable entry in the landscape of telecommunications and networking technology, showcasing an innovative blend of features and capabilities that cater to the evolving demands of modern communication systems. Released as part of the company's broader portfolio aimed at enhancing network efficiency and reliability, the 7400B addresses the needs of both voice and data transmission organized around high-performance protocols.

One of the main features of the Lucent Technologies 7400B is its advanced signal processing capabilities. The device is built to handle a significant amount of bandwidth, making it suitable for high-capacity environments where data traffic can fluctuate dynamically. With its ability to support various signaling protocols, the 7400B is adept at integrating with existing infrastructure while providing the flexibility required to adopt emerging technologies.

The 7400B employs state-of-the-art voice encoding and compression techniques that optimize the quality of voice communications. This technology ensures clarity and minimizes latency, which is crucial for enterprises relying heavily on voice-over-IP (VoIP) applications and unified communications. The system supports multiple codecs, enabling it to seamlessly manage both traditional telephony and next-generation voice services.

In terms of reliability, the Lucent 7400B features robust redundancy protocols, ensuring continuous service availability even in the face of potential hardware failures or unexpected disruptions. It also includes built-in diagnostic tools that facilitate rapid troubleshooting, allowing technicians to identify and resolve issues efficiently. This focus on reliability makes the 7400B a preferred choice for critical business applications where downtime can lead to significant productivity losses.

The integration of advanced networking technologies such as Quality of Service (QoS) further enhances the performance of the 7400B. This capability ensures that high-priority applications receive the necessary bandwidth, maintaining optimal performance levels regardless of overall network traffic loads.

Moreover, the Lucent Technologies 7400B is designed with scalability in mind. Organizations can start with a basic configuration and expand their capacity as needed, thus ensuring that their investment remains relevant as their communication demands grow. This scalability is complemented by a user-friendly management interface, allowing network administrators to configure and monitor the system with ease.

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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