IBM 3874 Serial Synchronous Modem Manuals

Manuals and User Guides for IBM 3874 Serial Synchronous Modem. We have 1 IBM 3874 Serial Synchronous Modem manual available for free PDF download: User Manual

IBM 3874 User Manual

IBM 3874 User Manual (88 pages)

Brand: IBM | Category: Modem | Size: 4 MB

Table of Contents

Table of Contents
4
Purpose of a Modem
10
The IBM 3874 Modem
11
Highlights
11
Variations
11
- Required Features
  11
  - Point-To-Point
    11
  - Multipoint Tributary
    11
  - Multipoint Control
    13
  - Switched Network
    13
- Optional Features
  13
  - Switched Network Back-Up
    13
  - Alternate Voice Feature
    13
  - Fan out Feature
    13
  - Automatic Call Originate
    13
- Direct Line Attachment
  13
Operator Controls
15
Operate/Test Switch
15
Reset Switch
18
Talk/Data Switch
18
Call Switch
18
Equalization
19
Equalization Duration
19
Equalization Procedures
20
Operating Procedures
23
Non-Switched Line: Voice Communication
24
- Making a Call
  24
- Answering a Call
  24
Switched Network: Setting up the Line
25
Completion of Data Transfer
31
- DAA-CBS Used
  31
- DAA-CDT Used
  31
Modem Tests
32
- Overheating
  32
Tests by Operator
32
Problem Determination
34
Functional Description
45
Modulation Technique
45
Modes of Operation
45
Transmission and Reception of Data
46
Equalization
47
Synchronization
48
Data Terminal Equipment/3874 Interface
49
- Transmission
  50
  - Request to Send
    50
  - Ready for Sending (Clear to Send)
    50
  - Transmitter Signal Element Timing
    50
  - Transmitted Data
    50
- Reception
  51
  - Received Line Signal Detector
    51
  - Receiver Signal Element Timing
    51
  - Received Data
    51
- Transmission and Reception
  51
  - Data Set Ready
    51
  - Data Signaling Rate Selector
    51
  - Select Standby
    52
  - Data Terminal Ready
    52
  - Calling Indicator (Ring Indicator)
    52
- Testing
  52
  - Test
    52
- Grounding
  52
  - Protective Ground
    52
  - Signal Ground
    52
Data Terminal Equipment/3874-ACO Interface
53
- Power Indication
  53
- Call Request
  53
- Present Next Digit
  53
- Data Line Occupied
  53
- Digit Signal
  53
- Digit Present
  53
- Distant Station Connected
  53
- Abandon Call
  53
- Protective Ground
  53
Data Access Arrangement/3874 Interfaces
54
- Data Access Arrangement Type CBS
  54
  - Auto-Calling
    54
  - Auto-Answering
    54
- Data Access Arrangement Type CDT
  54
Use of Fan-Out Feature
55
Strapping Options
58
Physical Installation
59
Unit Specifications
59
- Dimensions
  59
- Service Clearances
  59
- Weight
  59
- Heat Dissipation
  59
- External Power Supplies
  59
- Environmental Requirements
  59
- Connector and Cable Locations
  59
Data Terminal Equipment Connector Basic
60
Data Terminal Equipment Connector with the ACO Feature
61
DAA-CBS Connector
61
Mainline Power Cord and Telephone Line Cables
62
Communication Channel
64
Customer Responsibilities
64
Specifications
65
- Non-Switched Network
  65
Telephone Handset
66
Appendix A. Country Differences
68
Appendix B. Switched Network Back-Up Operation
69
Typical Back-Up Configurations
69
Programming and Equipment Options
71
3874 Features for Back-Up Operation
75
Appendix C. Abbreviations and Glossary
77
Abbreviations
77
Index
79

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