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Modem
3872
User manual
IBM 3872 User Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
IBM 3872 Modem
Function of a Modem
Highlights
Design Features
Special Features
Planning a Modem Installation
Data Terminal Equipment Considerations
Modem Considerations
Channel Considerations
Introduction to Modems
Function of Data Terminal Equipment
Definition of Terms
Modem-Channel-Modem Subsystem
Modem Functions and Configurations
Modem Internal Functions
Modem Configurations
Modem-Channel Interface and Types of Facilities
Modem Operations
Switches and Indicators
Normal Operating and Monitoring Procedures
Non-Switched (Leased Line)
Switched Network Without ACO
Switched Network with ACO
SNBU Modem on Switched Network
Monitoring Automatic Call Origination (ACO)
Monitoring Automatic Answering
Programmed Testing
Manual Operations with Switched Network Features
Modem Environment
Channel Characteristics
Noise
Echo
Distortion and Delay
Equalizers
Bridges
Modem-Data Terminal Equipment Interface
Functional Description of DTE Interface Lines
3872-DTE Interface
Using Machine Considerations
New Sync Line
Test Line
Data Set Ready Line
Data Signal Rate Selector Line
Select Standby Line
Propagation through the Modem
Spurious Bits
Clear-To-Send Delay
Data Carrier Detected and Echo Clamp Delays
Loss of Carrier Options
Installation Planning
IBM 3872 Modem Specifications
Operation
Equalization
Special Feature Descriptions
Second Modem Feature
Point-To-Point Feature
Multipoint Tributary Feature
Switched Network Feature
Communications Channel Interface (Automatic Access Arrangement)
DTE Interface (Automatic Access Arrangement)
Operation
Switched Network Backup Feature
Switched Network Backup with Automatic Answering Feature
Automatic Call Origination on Switched Network Feature
Communications Channel Interface (Automatic Access Arrangement)
DTE Interface (Automatic Access Arrangement)
Operation
Direct Line Attachment Feature (World Trade Countries)
Alternate Voice Feature
Fan-Out Feature
Appendix A. World Trade Considerations
Channel Specifications
Direct Line Attachment
Switched Network Operation in the USA and Canada
Caducee Attachment Feature (France
DTE Interface
Coffret Interface
Operation
Appendix B. Glossary
Appendix C. Switched Network Backup with BTAM
Excessive Errors and Alternative Actions
Standby Configuration Planning
General Considerations
Terminal
Multiplexer
Backup for Point-To-Point Dedicated Communications Channels
Backup for Multipoint Dedicated Communications Channels
Program Considerations and Program-Operator Communication
Standby Changeover and Operation
Point-To-Point Backup
Answer (CBS Data Coupler) at Terminal
Both Ends
Multipoint Backup
Index
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Systems
GA27-3058-3
File No. 3872-09
IBM 3872 Modem
User's Guide
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