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Manuals
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IBM Manuals
Modem
3874
User manual
IBM 3874 User Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Purpose of a Modem
The IBM 3874 Modem
Highlights
Variations
Required Features
Point-To-Point
Multipoint Tributary
Multipoint Control
Switched Network
Optional Features
Switched Network Back-Up
Alternate Voice Feature
Fan out Feature
Automatic Call Originate
Direct Line Attachment
Operator Controls
Operate/Test Switch
Reset Switch
Talk/Data Switch
Call Switch
Equalization
Equalization Duration
Equalization Procedures
Operating Procedures
Non-Switched Line: Voice Communication
Making a Call
Answering a Call
Switched Network: Setting up the Line
Automatic Call Originate (CBS Only)
Manual Calling with Cbss at both Ends
Manual Calling with CDT, but with CBS at the Other End
Manual Calling with Cdts at both Ends
Manual Calling with CBS, but with CDT at the Other End
Auto-Answering (CBS Only)
Manual Answering with Cbss at both Ends
Manual Answering with Cdts at both Ends
Manual Dialing from the ACO Panel (3874)
Completion of Data Transfer
DAA-CBS Used
DAA-CDT Used
Modem Tests
Overheating
Tests by Operator
Problem Determination
Procedure I. Point-To-Point
Procedure III. Multipoint (Only One Tributary Fails)
Procedure IV. Switched Network
Procedure V. Switched Network with ACO
Functional Description
Modulation Technique
Modes of Operation
Transmission and Reception of Data
Equalization
Synchronization
Data Terminal Equipment/3874 Interface
Transmission
Request to Send
Ready for Sending (Clear to Send)
Transmitter Signal Element Timing
Transmitted Data
Reception
Received Line Signal Detector
Receiver Signal Element Timing
Received Data
Transmission and Reception
Data Set Ready
Data Signaling Rate Selector
Select Standby
Data Terminal Ready
Calling Indicator (Ring Indicator)
Testing
Test
Grounding
Protective Ground
Signal Ground
Data Terminal Equipment/3874-ACO Interface
Power Indication
Call Request
Present Next Digit
Data Line Occupied
Digit Signal
Digit Present
Distant Station Connected
Abandon Call
Protective Ground
Data Access Arrangement/3874 Interfaces
Data Access Arrangement Type CBS
Auto-Calling
Auto-Answering
Data Access Arrangement Type CDT
Use of Fan-Out Feature
Strapping Options
Physical Installation
Unit Specifications
Dimensions
Service Clearances
Weight
Heat Dissipation
External Power Supplies
Environmental Requirements
Connector and Cable Locations
Data Terminal Equipment Connector Basic
Data Terminal Equipment Connector with the ACO Feature
DAA-CBS Connector
Mainline Power Cord and Telephone Line Cables
Communication Channel
Customer Responsibilities
Non-Switched Connection
Switched Network Connection
Switched Network Back-Up Connection
Specifications
Non-Switched Network
Telephone Handset
Appendix A. Country Differences
Appendix B. Switched Network Back-Up Operation
Typical Back-Up Configurations
Programming and Equipment Options
Programming Option Selection
Equipment Selection at CPU End
Equipment Selection at Terminal End
3874 Features for Back-Up Operation
Appendix C. Abbreviations and Glossary
Abbreviations
Index
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Systems
GA33-0002-3
TP-09
IBM 3874 Modem
User's Guide
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