AT&T 7400 series - Manual

AT&T 7400 series

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Table of Contents:

  • Page 3 – CONTENTS
  • Page 15 – xv
  • Page 16 – xvi
  • Page 17 – ABOUT THIS DOCUMENT; Designing telecommunications networks; PREREQUISITE SKILLS AND KNOWLEDGE; An Introduction to AT&T; DOCUMENT ORGANIZATION; xvii
  • Page 18 – xviii; PART I; Generic 1 and Generic 2 communications systems.
  • Page 19 – xix; HOW TO MAKE COMMENTS ABOUT THIS DOCUMENT
  • Page 20 – xx
  • Page 21 – INTRODUCTION TO CONNECTIVITY; Transmission types
  • Page 25 – the same amplitude as the analog signal at the sampled point.; communications system contains a codec, called a digitizer,
  • Page 27 – communications systems —; , the analog port samples the analog
  • Page 28 – Figure 1-2. Transmission States for Voice Communication
  • Page 29 – Circuit Packs; Traditional Universal; Exiting the Switch
  • Page 30 – Analog CO
  • Page 31 – DATA TRANSMISSION
  • Page 32 – Figure 1-3. Transmission States for Data Transmission
  • Page 33 – Protocols Used; Layer 1 Protocols; Generic 1 and 2 systems use this protocol for; Analog — A modulated carrier signal.
  • Page 34 – Layer 2 Protocols; At layer 2, the protocols are given below.; Protocol States; Table 1-3. Protocol States for Data Communication
  • Page 35 – Protocol Code; Connectivity Rules
  • Page 37 – Time-Division Multiplexing
  • Page 38 – Statistical Multiplexing; Communications
  • Page 39 – Line Coding; Alternating Mark Inversion; volts. That is, every other 1 is represented
  • Page 40 – B8ZS Line Coding
  • Page 41 – Signal Inversion; Channel Traffic
  • Page 44 – Framing
  • Page 45 – D4 Framing; Signaling
  • Page 47 – 4th-Channel Signaling; There are three variations of 24th-channel signaling:; Channels
  • Page 48 – Signaling Types; Tie lines to other private switches
  • Page 49 – MULTIPLEXING OUTSIDE THE SWITCH
  • Page 51 – Compressing the Signal; II; II; DDS data-port adaptors
  • Page 52 – Changing the Transmission Medium from Metallic to Fiber-Optic; Microwave System T1 Trunk Capacity; Demultiplexing
  • Page 53 – Figure 1-10. Possible Multiplexed Connections
  • Page 54 – STATISTICAL MULTIPLEXING
  • Page 55 – systems, and the switch at a central office.
  • Page 56 – attendant or ACD agents.
  • Page 57 – Special-Access Trunks; number identification service (DNIS) is a; Spectrum of Digital Services,
  • Page 58 – Advanced Private Line Termination (APLT) Trunks; CONNECTIVITY; and
  • Page 59 – Access can also be switched or nonswitched.; systems use
  • Page 60 – Signaling Protocols
  • Page 61 – System 75/G1 Administration; Trunk Type; Comm Type; Group Type; DS1 Options
  • Page 62 – INTERFACE CIRCUIT
  • Page 65 – Table 1-11. Generic 1 and Generic 2 Digital Trunks — Voice BCC
  • Page 73 – COMMUNICATION SYSTEM NETWORKING — AN OVERVIEW
  • Page 74 – TYPES OF NETWORKS
  • Page 75 – NETWORK EVOLUTION
  • Page 76 – Software; Basic Networking Software
  • Page 77 – Trunk access through dial access codes; System 75 and Generic 1 UDP Package
  • Page 78 – switch for processing.; , System 85, and Generic 2 Multipremises Package; , System 85, or Generic 2 communications system; , System 85, and Generic 2 Multipremises package; System 75 and Generic 1 PNA Package
  • Page 79 – Distributed Communications System; Generic 2 communications systems use the data; NETWORK CALL PROCESSING; The internal dial plan recognizes the type of call being made.
  • Page 80 – communication systems.; Internal Dial Plan; Uniform Numbering; , System 85, and Generic 2 communications systems it is a separate
  • Page 81 – Figure 2-1. Internal Dial Plan Interactions; — Extension number steering — On a
  • Page 82 – the extension and RNX number to AAR for processing.; , System 85, and Generic 2 systems, the UDP function is called RNX; Auxiliary Call Information
  • Page 83 – Communications System Generic 2 Administration; Automatic Alternate Routing; System 85, or Generic 2 communications systems.
  • Page 85 – Selecting a Trunk Group
  • Page 86 – Automatic Route Selection; Analyzing the dialed number
  • Page 87 – Unauthorized calls. These ARS sends to intercept.
  • Page 88 – before processing the call further.; Modifying the Digits
  • Page 89 – NETWORK ADMINISTRATION
  • Page 90 – Table 2-2. Network Administration Terminals and Systems; Generic 2
  • Page 93 – TANDEM TIE TRUNK NETWORKS; A tandem tie trunk (TTT) network is an network of; INTERACTIONS WITH OTHER NETWORKS
  • Page 95 – OR MULTIPREMISES PACKAGES; MS/T configurations are appropriate when:
  • Page 96 – Main-Satellite Configuration; Main-satellite configurations offer the following features:
  • Page 97 – Main-Tributary Configuration; A tributary can have one or more attendant positions.
  • Page 99 – Figure 4-3. Dialing Patterns From Tributary or Satellite to Main; Figure 4-4. Dialing Patterns From Main to Satellite or Tributary
  • Page 100 – Figure 4-5. Dialing Patterns From Main to Tandem
  • Page 101 – Routing Incoming Calls; Public network calls arrive with the extension number.; Routing Outgoing Calls; From the MS/T complex to the tandem or main:
  • Page 102 – From the main to the satellite or tributary:; Other Routing Capabilities; The; No second dial tone returned at the receiving end upon seizure.
  • Page 103 – Cannot be used in an ISDN-PRI arrangement.; INTERACTIONS; PRI trunks cannot be used as tie or access trunks in an MS/T complex.
  • Page 105 – PNA PACKAGES; System 85, or Generic 1 or 2 communications system.; ETN CONFIGURATIONS; Tandem switches that accept and/or pass on call traffic
  • Page 106 – ETN TRUNKS
  • Page 108 – Access and Bypass Access Tie Trunks
  • Page 109 – FEATURES; Three features are used in the implementation of an ETN:; Uniform Numbering Plan
  • Page 110 – Figure 5-3. Private Network Uniform Numbering Plan
  • Page 112 – Extension Number Portability Clusters
  • Page 113 – Software-Defined Network; Access to SDN is either switched or nonswitched.; and 2 communications systems can fulfill these requirements.
  • Page 116 – extension number it receives.; Release Link Trunk Networks — CAS and ACD
  • Page 117 – Figure 5-8. Centralized Attendant Service; Centralized Attendant Service; communications systems.
  • Page 118 – Distributed Communications System Clusters; See chapter 6 for a detailed explanation of DCS.; ENGINEERING CONSIDERATIONS; The chapter on Designing Alternate Routing Networks in the; Communications System and System
  • Page 119 – , System 85, and Generic 2 communications systems, the link is
  • Page 120 – DCS CLUSTERS; Switch Node; DCS; DCS LINKS
  • Page 121 – Tie Trunks; Signaling Links; , System 85, and Generic 2 communications; Switch Physical; Generic 1
  • Page 122 – Transmission Media; Figure 6-2. Internally Connected DCS Signaling Channel Over a DS1
  • Page 123 – Communications System; Communications System Generic 2.1 to Generic 1.1
  • Page 124 – Linkage Design
  • Page 125 – G H
  • Page 126 – Data Service Unit
  • Page 128 – MTDM
  • Page 132 – TRANSPARENT FEATURES; Attendant Call Waiting
  • Page 133 – Table 6-3. Availability of Attendant Features; Alphanumeric Display
  • Page 134 – Group Selection button.
  • Page 135 – Alerting—Distinctive Ringing
  • Page 136 – Call Coverage Tone; Call Forwarding; Call Waiting
  • Page 137 – Audio Information Exchange (AUDIX) Features Transparency; . The enhancements are noted in the following list:
  • Page 140 – PBXs, an economical alternative to incorporating two DSUs
  • Page 141 – ADMINISTRATION CONSIDERATIONS; To determine how to administer DCS nodes, refer to the; Communications System System 75 and; Communications System System 85 and
  • Page 142 – PBX and; — Call Coverage Tone
  • Page 143 – DATA CONNECTIVITY — AN OVERVIEW
  • Page 144 – DATA COMMUNICATIONS VARIABLES; Terminals; Communications Protocols
  • Page 146 – Synchronous vs. Asynchronous
  • Page 148 – Transmission Speed
  • Page 149 – Type of Communications Channel; Creating Switch — Packet vs. Circuit Switches
  • Page 150 – Channel Assignment — Dial-up vs. Dedicated Connections
  • Page 151 – See chapter 8 for specific modem pool configurations.; SPECIAL DATA FEATURES; Terminal Dialing
  • Page 152 – Table 7-1. Data Feature vs Communications Systems
  • Page 153 – CR; Data Protection; This; Data Protection is provided in two forms:; Data Privacy; code that the user enters when placing the call.; Data Restriction; Data Only Off-Premises Extension
  • Page 155 – DATA COMMUNICATIONS CAPABILITIES
  • Page 159 – DCE POSSIBILITIES; digital service are provided at the remote end of; Voice Terminal Adjunct Data Modules
  • Page 160 – Standalone Data Modules; modification kit. With this; ADUs
  • Page 164 – MODEM POOLING CONNECTIONS
  • Page 166 – Figure 8-5. Modem Pooling over a DS1 Channel
  • Page 168 – LAN TRANSMISSION MEDIA
  • Page 169 – Communication Between the LAN and Outside DTEs
  • Page 170 – Type of
  • Page 172 – ISN Communication; Communication Between the LAN and Other Networks
  • Page 174 – The Communication System as a LAN Backup
  • Page 175 – Packet Service; APS Applications; Database searches and updates; APS Access
  • Page 176 – SDS and SDDN Applications; SDS and SDDN applications include:
  • Page 177 – Connections to the Public SDN/SDDN Circuit-Switched Data Network
  • Page 178 – Table 8-6. Requirements for Connections from the PBX to SDS/SDDN
  • Page 180 – Digital Data Service, or the SKYNET; Private Connections Through
  • Page 181 – If an MPDM is used, it must be installed with a V.35 interface and an; SW56 modification
  • Page 182 – Figure 8-19. Private Data Network with 24
  • Page 183 – Private Terrestrial Connections Through; Robbed Bit Dedicated or Data Data
  • Page 184 – Satellite Private Data Network Links
  • Page 186 – Figure 8-22. Telemarketing Gateway Configuration
  • Page 189 – DATA NETWORK ADMINISTRATION
  • Page 191 – DATA COMMUNICATIONS CONFIGURATIONS; you can configure your networks to:; modification kit. This MPDM is sometimes called the MPDM/M1* or the
  • Page 192 – DSC AND PSC CONNECTIONS; Analog line and trunk ports
  • Page 195 – SNA NODE CONNECTIONS
  • Page 196 – Switched Digital Service,; Video Teleconferencing; Switched Digital Service or the Software-Defined
  • Page 197 – Switched Digital Service or Software-Defined; FAX Transmittal; Switched Digital Service or the Software-Defined Digital
  • Page 198 – Figure 9-5. A Possible Imaging Configuration
  • Page 199 – Reference
  • Page 200 – Multiplexer to
  • Page 201 – Introduction to
  • Page 202 – Feature Translations for
  • Page 203 – PBX Systems — Application Notes —; SYSTEM 75 AND GENERIC 1
  • Page 204 – PBX Systems — Application Notes — Trunk
  • Page 205 – Sales; SYSTEM 85 AND GENERIC 2
  • Page 206 – Operation
  • Page 209 – B. SYNCHRONIZATION OF DIGITAL FACILITIES; THE NEED FOR SYNCHRONIZATION
  • Page 211 – SYNCHRONIZATION HIERARCHY
  • Page 217 – Blue alarm means that the switch cannot be used as a reference.
  • Page 219 – CHANGES TO THE SCS SOFTWARE MADE AVAILABLE VIA SOFTWARE PATCHES
  • Page 220 – System 75 and Generic 1 Synchronization Software Operation; On-line synchronization reference failure
  • Page 221 – system status
  • Page 222 – The DS1 reference determines that the LOS error no longer exists.; The External Synchronization Clock
  • Page 223 – and secondary references also apply to these references.
  • Page 226 – NETWORK SYNCHRONIZATION AND ENGINEERING; The primary goals of network synchronization are:; Selecting a Timing Source for the Switch
  • Page 228 – EXAMPLE FOR RULE 1; Figure B-12. Nonpublic Network without Digital Switches
  • Page 229 – EXAMPLE FOR RULE 2; Figure B-13. Proper Use of Backup Facilities
  • Page 230 – Figure B-14. Improper Use of Backup Facilities; record
  • Page 231 – EXAMPLE FOR RULE 4
  • Page 232 – Figure B-16. Less Than Optimal Diverse Routing; EXAMPLE FOR RULE 6
  • Page 234 – EXAMPLE FOR RULE 7; Figure B-19. Excessive Synchronization from One Node
  • Page 235 – Figure B-20. Minimized Synchronization from One Node
  • Page 236 – AVAILABILITY OF SYNCHRONIZATION SOURCES; AT&T communications can provide the synchronization source.; Misconception 3
  • Page 237 – CONCLUSIONS ON SYNCHRONIZATION
  • Page 238 – USE OF GENERIC 1 AS A SYSTEM CLOCK REFERENCE
  • Page 241 – C. TRUNKING TERMS AND CAPABILITIES; FREQUENTLY USED TERMS; Address
  • Page 242 – Alerting Signals; Bypass Tie Trunk
  • Page 243 – CCSA (or Common Control Switching Arrangement); PBX LC11 circuit pack may be optioned to provide DX signaling.
  • Page 245 – Derived E&M Lead Signaling
  • Page 246 – Direct Access
  • Page 247 – ETN Trunking Facilities
  • Page 248 – Glare
  • Page 249 – opposite for the trunk to work at all.
  • Page 250 – 00-milliseconds——for; PBX
  • Page 251 – Main PBX; PBX, this term refers to the 70 series of trunk types that are; this type of signaling.
  • Page 252 – Reverse Battery
  • Page 253 – Signaling Type
  • Page 254 – For; Type of Dialing; Universal Trunk Type
  • Page 256 – SUGGESTIONS AND HELPFUL HINTS; Wink Start is the most frequently used start-dial signal; ground start trunk circuits do not have this requirement.; PBX and over digital facilities
  • Page 257 – TRUNKING CHARACTERISTICS TABLE
  • Page 258 – DIMENSION PBX
  • Page 259 – Trunk class may be either PF or PFLASH.
  • Page 260 – SWITCH A
  • Page 273 – D. COMMUNICATIONS PROTOCOLS; European Computer Manufacturers Association (ECMA)
  • Page 274 – OSI MODEL
  • Page 277 – Session Layer; Names of digital standards formulated by the CCITT start with X.; CCITT Standards
  • Page 278 – Name Title; International user classes of service in public data networks
  • Page 279 – International alphabet no. 5
  • Page 281 – Other Common Standards; Layer 1 protocols include:
  • Page 282 – OSI ISO
  • Page 283 – Digital Multiplexed Interface; Communications System Generic 2 and System 75 and
  • Page 284 – —Requires a ‘‘circuit-switched’’ transmission facility
  • Page 286 – Data Mode 2
  • Page 288 – Data Mode 3; Digital Communications Protocol
  • Page 289 – Table D-5. DCP versus ISDN-BRI protocol parameters comparison
  • Page 290 – DCIU
  • Page 291 – Application Layer. This layer is named but not regulated in BX.25.
  • Page 301 – F. NETWORKING FEATURES——AVAILABILITY MATRIX
  • Page 303 – NETWORKING FEATURES——AVAILABILITY MATRIX (Contd)
  • Page 307 – ABBREVIATIONS
  • Page 313 – GLOSSARY; See Automatic Call Distribution.
  • Page 314 – analog
  • Page 315 – AUDIX Standalone; Communications System Generic 2 only); AVD
  • Page 316 – An information carrying channel on an ISDN interface.; See binary synchronous communications.
  • Page 317 – See basic rate interface.; ’e Consultatif International Telephonique et Telegraphique) an
  • Page 318 – See 24th channel signaling.
  • Page 319 – CSU; data channel
  • Page 320 – See data communications interface unit.
  • Page 321 – See Direct Department Calling.
  • Page 322 – digital transmission
  • Page 323 – See digital multiplexed interface with bit-oriented signaling.
  • Page 324 – See electronic tandem network.; A function or service provided by a hardware or software product.; See Front End Processor.
  • Page 326 – Permanently connected via hardware.; See hybrid telephone.
  • Page 328 – manual dialing; AT&T’s tariffed digital 800-service offering for inward calling.; modem
  • Page 329 – See modular processor data module.
  • Page 330 – See Open Systems Interconnection reference model.
  • Page 331 – PDM
  • Page 332 – public network
  • Page 333 – See Synchronous Data Link Control.
  • Page 334 – A version of HDLC designed by IBM for use between their equipment.; See synchronous data transmission.; The switched connection of an incoming trunk to an outgoing trunk.
  • Page 335 – Two copper wires used for the transmission of voice and/or data.
  • Page 336 – WATS trunk
  • Page 337 – INDEX; access trunk—Contd
  • Page 338 – reference frequency B-28
  • Page 339 – compression—Contd
  • Page 340 – DMI
  • Page 341 – internal dial plan—Contd
  • Page 342 – multiplexing—Contd; development steps B-29
  • Page 343 – network—Contd
  • Page 345 – signaling—Contd
  • Page 347 – trunk—Contd; voice
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Communications System

Network and Data Connectivity

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Summary

Page 3 - CONTENTS

CONTENTS _ ______________________________________________________________________________________ _ ______________________________________________________________________________________ _ ______________________________________________________________________________________ A AB BO OU UT T T TH HI ...

Page 15 - xv

CONTENTS xv _ ______________________________________________________________________________________ _ ______________________________________________________________________________________ _ ______________________________________________________________________________________ Table 8-8. Requiremen...

Page 16 - xvi

xvi CONTENTS _ ___________________________________________________________________________________________________________________________ _ ___________________________________________________________________________________________________________________________ _ _________________________________...

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