用户手册 — AT&T 2500 series

目录

• Table of Contents

  3
• ABOUT THIS DOCUMENT

  17
  • PREREQUISITE SKILLS AND KNOWLEDGE

    17
  • DOCUMENT ORGANIZATION

    17
  • HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT

    19
• 1. INTRODUCTION TO CONNECTIVITY

  21
  • TRANSMISSION TYPES

    23
    • ANALOG TRANSMISSION

      23
    • DIGITAL TRANSMISSION

      23
    • ANALOG VS. DIGITAL

      25
  • TRANSMISSION STATES

    27
    • VOICE TRANSMISSION

      27
      • Entering the Switch

        27
      • Exiting the Switch

        29
    • DATA TRANSMISSION

      31
      • Protocol Layers

        31
      • Protocols Used

        33
      • Protocol States

        34
      • Connectivity Rules

        35
  • MULTIPLEXED COMMUNICATION

    37
    • TYPES OF MULTIPLEXING

      37
      • Frequency-Division Multiplexing

        37
      • Time-Division Multiplexing

        37
      • Statistical Multiplexing

        38
    • MULTIPLEXING OVER DS1 FACILITIES

      38
      • Line Coding

        39
      • Signal Inversion

        41
      • Framing

        44
      • Signaling

        45
    • MULTIPLEXING OUTSIDE THE SWITCH

      49
      • Multiplexing onto T1 Trunks

        49
      • Compressing the Signal

        51
      • Altering Channel Assignments on T1 Trunks

        51
      • Getting the Signal Ready for the Central Office

        51
      • Changing the Transmission Medium from Metallic to Fiber-Optic

        52
      • Multiplexing with Microwave

        52
      • Demultiplexing

        52
    • STATISTICAL MULTIPLEXING

      54
  • TRUNKING

    55
    • APPLICATION

      55
      • Local Exchange Trunks

        55
      • Tie Trunks

        56
      • Special-Access Trunks

        57
      • Auxiliary Trunks

        57
      • Miscellaneous Trunks

        57
    • CONNECTIVITY

      58
    • ADMINISTRATION OPTIONS

      59
      • System 85/G2 Administration

        59
      • System 75/G1 Administration

        61
      • DS1 Options

        61
    • INTERFACE CIRCUIT

      62
    • TRUNK TABLES

      62
• 2. COMMUNICATION SYSTEM NETWORKING (em AN OVERVIEW

  73
  • TYPES OF NETWORKS

    74
  • NETWORK EVOLUTION

    75
  • SOFTWARE CAPABILITIES

    76
    • Basic Networking Software

      76
    • Main-Satellite/Tributary Software (em The UDP and Multipremises Packages

      77
    • Electronic Tandem Network Software (em The PNA and ETN (Standard Network) Packages

      78
    • Distributed Communications System

      79
  • NETWORK CALL PROCESSING

    79
    • Internal Dial Plan

      80
    • Auxiliary Call Information

      82
    • Automatic Alternate Routing

      83
    • Automatic Route Selection

      86
  • NETWORK ADMINISTRATION

    89
  • PRIVATE NETWORK TRUNKS

    89
  • NETWORKING FEATURE PARAMETERS

    89
• 3. TANDEM TIE TRUNK NETWORKS

  93
  • INTERACTIONS WITH OTHER NETWORKS

    93
• 4. MAIN-SATELLITE/TRIBUTARY (MS/T) NETWORKS THROUGH THE UDP OR MULTIPREMISES PACKAGES

  95
  • MS/T CONFIGURATIONS

    96
    • Main-Satellite Configuration

      96
    • Main-Tributary Configuration

      97
  • MS/T FEATURES

    98
    • Routing Incoming Calls

      101
    • Routing Outgoing Calls

      101
    • Other Routing Capabilities

      102
  • ENGINEERING CONSIDERATIONS

    102
  • INTERACTIONS

    103
• 5. ELECTRONIC TANDEM NETWORK (ETN) THROUGH THE ETN AND PNA PACKAGES

  105
  • ETN CONFIGURATIONS

    105
  • ETN TRUNKS

    106
    • Access and Bypass Access Tie Trunks

      108
    • Off-Net Trunks

      109
  • FEATURES

    109
    • Uniform Numbering Plan

      109
    • Automatic Alternate Routing

      111
    • Automatic Route Selection

      111
  • ETN INTERACTIONS WITH OTHER NETWORKS

    111
    • Extension Number Portability Clusters

      112
    • Software-Defined Network

      113
    • Release Link Trunk Networks - CAS and ACD

      116
    • Distributed Communications System Clusters

      118
    • Main-Satellite/Tributary Networks

      118
  • ENGINEERING CONSIDERATIONS

    118
• 6. DISTRIBUTED COMMUNICATIONS SYSTEM (DCS)

  119
  • DCS CLUSTERS

    120
  • DCS LINKS

    120
    • Tie Trunks

      121
    • Signaling Links

      121
  • DCS SIGNALING LINK CONNECTIONS

    126
    • System 75 or Generic 1 (G1) to System 75 or G1

      126
    • System 85 or Generic 2 (G2) to System 85 or G2

      128
    • System 75 or Generic 1 (G1) to System 85 or Generic 2 (G2)

      130
    • DIMENSION Signaling Links

      132
  • TRANSPARENT FEATURES

    132
    • Transparent Attendant Features

      132
    • Transparent Voice Terminal Features

      135
    • Audio Information Exchange (AUDIX) Features Transparency

      137
  • ENGINEERING CONSIDERATIONS

    139
  • ADMINISTRATION CONSIDERATIONS

    141
• 7. DATA CONNECTIVITY - AN OVERVIEW

  143
  • DATA COMMUNICATIONS VARIABLES

    144
    • Communications Protocols

      144
    • Analog vs. Digital

      146
    • Synchronous vs. Asynchronous

      146
    • Simplex vs. Half-Duplex vs. Full-Duplex

      147
    • Parallel vs. Serial

      148
    • Transmission Speed

      148
    • Type of Communications Channel

      149
  • SPECIAL DATA FEATURES

    151
    • Terminal Dialing

      151
    • Data Call Setup From a Voice Terminal

      152
    • Computer Dialing

      152
    • Data Hot Line

      152
    • Data Protection

      153
    • Data Privacy

      153
    • Data Restriction

      153
    • Data Only Off-Premises Extension

      153
• 8. DATA COMMUNICATIONS CAPABILITIES

  155
  • DTE CONNECTIONS

    157
    • DTE COMPATABILITY

      157
      • Protocol Converters

        157
      • Terminal Emulators

        158
      • PC/PBX or PC/ISDN

        158
    • DCE POSSIBILITIES

      159
      • Data Modules

        159
      • ADUs

        160
      • Modems

        160
    • DATA MODULE CHARACTERISTICS

      160
    • MODEM POOLING CONNECTIONS

      164
  • LOCAL AREA NETWORK CONNECTIONS

    167
    • LAN TOPOLOGY

      167
    • LAN PROTOCOL

      167
    • LAN TRANSMISSION MEDIA

      168
    • LAN CONNECTORS

      168
    • ADVANTAGES OF A COMMUNICATIONS SYSTEM IN A LAN ENVIRONMENT

      168
      • Communication Between the LAN and Outside DTEs

        169
      • Communication Between the LAN and Other Networks

        172
      • The Communication System as a LAN Backup

        174
  • PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS

    175
    • PUBLIC DATA NETWORKS

      175
      • Packet-Switched Public Data Networks

        175
      • Circuit-Switched Public Data Networks

        176
    • PRIVATE DATA NETWORKS

      180
      • Terrestrial Private Data Network Links

        180
      • Satellite Private Data Network Links

        184
  • TELEMARKETING HOST CONNECTIONS

    185
    • THE ISDN GATEWAY

      185
    • THE INTEGRATED TELEMARKETING GATEWAY

      185
  • DATA NETWORK ADMINISTRATION

    189
• 9. DATA COMMUNICATIONS CONFIGURATIONS

  191
  • DSC AND PSC CONNECTIONS

    192
  • SNA NODE CONNECTIONS

    195
  • CONNECTIONS THROUGH PUBLIC OR PRIVATE DATA NETWORKS

    196
    • File Transfers

      196
    • Video Teleconferencing

      196
    • Image Processing

      197
    • FAX Transmittal

      197
• A. RELATED DOCUMENTS

  199
• B. SYNCHRONIZATION OF DIGITAL FACILITIES

  209
  • THE NEED FOR SYNCHRONIZATION

    209
  • SYNCHRONIZATION HIERARCHY

    211
  • CHANGES TO THE SCS SOFTWARE MADE AVAILABLE VIA SOFTWARE PATCHES

    219
  • NETWORK SYNCHRONIZATION AND ENGIINEERING

    226
  • AVAILABILITY OF SYNCHRONIZATION SOURCES

    236
  • CONCLUSIONS ON SYNCHRONIZATION

    237
  • USE OF GENERIC 2 AS A SYSTEM CLOCK REFERENCE

    237
  • USE OF GENERIC 1 AS A SYSTEM CLOCK REFERENCE

    238
• C. TRUNKING TERMS AND CAPABILITIES

  241
• D. COMMUNICATIONS PROTOCOLS

  273
  • OSI MODEL

    274
  • STANDARD PROTOCOLS

    277
  • AT&T PROTOCOLS

    282
• E. LEAD DEFINITIONS

  293
• F. NETWORKING FEATURES - AVAILABILITY MATRIX

  301
• ABBREVIATIONS

  307
• GLOSSARY

  313
• INDEX

  337