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AT&T 2500 series, 7500 series, 7100 series, 7200 series manual Data Communications Configurations

Models: 7400 series 2500 series 7200 series 7500 series 7300 series 7100 series

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viiiCONTENTS

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The Communication System as a LAN Backup

PUBLIC AND PRIVATE DATA NETWORK CONNECTIONS

PUBLIC DATA NETWORKS

Packet-Switched Public Data Networks

Circuit-Switched Public Data Networks

PRIVATE DATA NETWORKS

Terrestrial Private Data Network Links

Satellite Private Data Network Links

TELEMARKETING HOST CONNECTIONS

THE ISDN GATEWAY

THE INTEGRATED TELEMARKETING GATEWAY

DATA NETWORK ADMINISTRATION

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8-26

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8-31

8-31

8-31

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9. DATA COMMUNICATIONS CONFIGURATIONS

9-1

DSC AND PSC CONNECTIONS

SNA NODE CONNECTIONS

CONNECTIONS THROUGH PUBLIC OR PRIVATE DATA NETWORKS

File Transfers

Video Teleconferencing

Image Processing

FAX Transmittal

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A. RELATED DOCUMENTS	A-1
B. SYNCHRONIZATION OF DIGITAL FACILITIES	B-1

THE NEED FOR SYNCHRONIZATION

SYNCHRONIZATION HIERARCHY

CHANGES TO THE SCS SOFTWARE MADE AVAILABLE VIA SOFTWARE PATCHES

NETWORK SYNCHRONIZATION AND ENGINEERING

AVAILABILITY OF SYNCHRONIZATION SOURCES

CONCLUSIONS ON SYNCHRONIZATION

B-1

B-3

B-11

B-18

B-28

B-29

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AT&T 2500 series, 7500 series Data Communications Configurations, Related Documents Synchronization of Digital Facilities

Contents

Definity Communications System Page Contents Multiplexing Outside the Switch Communication System Networking AN OverviewTandem TIE Trunk Networks Distributed Communications System DCS Data Connectivity AN OverviewSpecial Data Features Data Communications CapabilitiesData Communications Configurations Related Documents Synchronization of Digital FacilitiesIndex Trunking Terms and Capabilities Communications ProtocolsGlossary List of Figures DSU MpdmFigure B-1 Options for Synchronization Figure B-11 External and Internal Reference Levels List of Tables BCCEIA RS-232C V.28 LEADS/DEFINITIONS EIA RS-232D V.28 LEADS/DEFINITIONSEIA RS-449 V.24 LEADS/DEFINITIONS EIA RS-366 LEADS/DEFINITIONSXvi Contents Document Organization About this DocumentPrerequisite Skills and Knowledge Part ∙ Glossary ∙ IndexHOW to Make Comments about this Document AT&TXx about this Document Introduction to Connectivity 2INTRODUCTION to Connectivity Digital Transmission Transmission TypesAnalog Transmission Analog-to-Digital Conversion Analog VS. Digital 6TRANSMISSION Types Voice Transmission Entering the SwitchTransmission States 8TRANSMISSION States Digital Switch Exiting the Switch ⎜ ModuleCircuit Packs Data Transmission Protocol Layers12TRANSMISSION States Originating Switch Destination Protocols Used Layer 1 ProtocolsLayer 2 Protocols Protocol States⎜DMI Mode Code Connectivity Rules16TRANSMISSION States Multiplexed Communication Types of MultiplexingFrequency-Division Multiplexing Time-Division MultiplexingStatistical Multiplexing Multiplexing Over DS1 FacilitiesZero Code Suppression ZCS Line Coding Line CodingAlternating Mark Inversion B8ZS Line Coding Signal Inversion Restricted ⎜ Unrestricted⎜ DMI 7Data-Module Capabilities Part 2 D4 Framing FramingESF Framing SignalingD4 Framing Robbed-Bit Signaling 24th-Channel Signaling ⎜ Channels 24th Channel ⎜ 24th ChannelESF ⎜ Frame No⎜ Isdn PRI Trunk Types/Destinations ⎜ Signaling Types⎜ DMI-BOS Multiplexing Outside the Switch Multiplexing onto T1 TrunksCDM CEM Host Digital DMI PBX Altering Channel Assignments on T1 Trunks Compressing the SignalGetting the Signal Ready for the Central Ofﬁce Multiplexing with Microwave Microwave System T1 Trunk CapacityDR23N DR18M DR18W DR23W Demultiplexing10.Possible Multiplexed Connections Statistical Multiplexing Local Exchange Trunks TrunkingApplication Tie Trunks Special-Access Trunks Auxiliary TrunksMiscellaneous Trunks Release Link Trunks RLTsRemote Access Trunks Host-Access TrunksAdvanced Private Line Termination Aplt Trunks ConnectivitySignaling Types Administration OptionsSystem 85/G2 Administration Signaling Protocols Trunk TypeSystem 75/G1 Administration Comm TypeGroup Type DS1 OptionsInterface Circuit Trunk TablesTrunking 44TRUNKING 11.Generic 1 and Generic 2 Digital Trunks Voice BCC 46TRUNKING Trunking 48TRUNKING Trunking 50TRUNKING Trunking 52TRUNKING Communication System Networking AN Overview Types of Networks Network Evolution Software ⎜ Network Type S75/G1 S85/G2 Package PECDCS Software CapabilitiesSystem 75 and Generic 1 UDP Package DIMENSION, System 85, and Generic 2 Multipremises Package System 75 and Generic 1 PNA PackageDistributed Communications System Network Call ProcessingRouting the Call Internal Dial PlanUniform Numbering DAC + EXT To ARS Auxiliary Call Information Automatic Alternate Routing Selecting a Routing Pattern∙ RNX ∙ Where the trunk group appears in the list of preferences Selecting a Trunk Group∙ The FRL of the call Modifying the DigitsAutomatic Route Selection Analyzing the Dialed NumberCommunication System Networking AN Overview To AAR Selecting the Routing Pattern Private Network Trunks Network AdministrationNetworking Feature Parameters ⎜ Maap ⎜ Vmaap System Definity Feature PBX 20COMMUNICATION System Networking AN Overview Tandem TIE Trunk Networks Interactions with Other Networks2TANDEM TIE Trunk Networks Attendant Lines ⎜ Main Satellite ⎜ Trunks MS/T Configurations Main-Satellite ConﬁgurationMain-Tributary Conﬁguration MS/T Features Networking Package Multipremises with ETA Main Networking Package PNA, ETN Routing Incoming Calls Routing Outgoing CallsOther Routing Capabilities Engineering ConsiderationsInteractions Page ETN Configurations ETN Trunks Page Access and Bypass Access Tie Trunks Uniform Numbering Plan FeaturesOff-Net Trunks Attendant ETN Interactions with Other Networks Extension Number Portability Clusters Software-Deﬁned Network Call Routing SDN to ETN Call Routing ETN to SDN Release Link Trunk Networks CAS and ACD Centralized Attendant Service Automatic Call DistributionDistributed Communications System Clusters Main-Satellite/Tributary NetworksDistributed Communications System DCS DCS Links Switch Node CapacityDCS Clusters Signaling Links Switch Physical Links ⎜Logical Channels/LinkSignaling Link Speed Signaling Link ProtocolTransmission Media Direct Link DCS Connections Linkage Design Distributed Communications System DCS DCS Signaling Link Connections Equipment Distance LimitationMTDM/MPDM System 75 or Generic 1 G1 to System 75 or G1System 75/G1 Signaling Channel DCP Mtdm System 85 or Generic 2 G2 to System 85 or G2Modem System 75 or Generic 1 G1 to System 85 or Generic 2 G2 RS232C to RS449 Conversion Dciu Dimension Signaling Links Transparent FeaturesTransparent Attendant Features Attendant Call WaitingAttendant Control of Trunk Group Access ⎜ ACAAlphanumeric Display Automatic Circuit AssuranceClass-of-Service/Restriction Display Trunk Group Busy/Warning IndicatorsBusy Veriﬁcation of Terminal Lines Calling Number DisplayAutomatic Callback on Busy or No Answer Transparent Voice Terminal FeaturesAlerting-Distinctive Ringing Call Coverage Tone Call ForwardingCall Waiting Leave Word Calling LWC Without APAudio Information Exchange Audix Features Transparency Call Transfer/Conference20.AUDIX in a DCS Network Definity PBX ⎜ Feature 22DISTRIBUTED Communications System DCS Administration Considerations Distributed Communications System, Issue 3Dimension PBX Data Connectivity AN Overview Data Communications Variables Communications ProtocolsDigital PBX Public Switched Network Pooled Modem Analog vs. Digital Synchronous vs. Asynchronous∙ ∙ ∙ Simplex vs. Half-Duplex vs. Full-DuplexParallel vs. Serial Transmission SpeedCreating Switch Packet vs. Circuit Switches Type of Communications ChannelChannel Assignment Dial-up vs. Dedicated Connections Channel Information Bearer vs. Signaling ChannelsTransmission Mode Changes and Modem Pools Special Data Features Terminal Dialing⎜Data Services Features Data Call Setup From a Voice TerminalComputer Dialing Data Hot LineData Protection Data PrivacyData Restriction Data Only Off-Premises ExtensionOff-Premises Data-Only Extension Conﬁgurations Data Communications Capabilities 2DATA Communications Capabilities Protocol Converters DTE ConnectionsDTE Compatibility Terminal Emulators PC/PBX or PC/ISDNVoice Terminal Adjunct Data Modules DCE PossibilitiesData Modules Data Module Characteristics Standalone Data ModulesADUs ModemsDTE Connections Dtdm ⎜ PC/PBX PC/PBXADM PC/ISDNModem Pooling Connections DCP TIP-RING 12DTE Connections Data Module LAN Protocol Local Area Network ConnectionsLAN Topology Advantages of a Communications System in a LAN Environment LAN ConnectorsLAN Transmission Media LAN Access to/from LANs That Use Other Operating Systems Type Operating Gateway PCLAN System SoftwareLocal Area Network Connections Remote PC X.25 Router ISN CommunicationCommunication Between the LAN and Other Networks SNA Gateway Type Operating CommunicationsSystem Package Communication System as a LAN Backup 12.LAN/SNA ConnectivityAccunet Packet Service APS AccessPublic and Private Data Network Connections Public Data NetworksCircuit-Switched Public Data Networks SDS and Sddn ApplicationsPublic and Private Data Network Connections MPDM/M1 Public and Private Data Network Connections DTE Mpdm Private Connections Through Accunet T1.5 and T45 Private Data NetworksTerrestrial Private Data Network Links MPDM/M1* AMI 28PUBLIC and Private Data Network Connections ⎜AMI Satellite Private Data Network Links Integrated Telemarketing Gateway Telemarketing Host ConnectionsIsdn Gateway 22.Telemarketing Gateway Conﬁguration For further details, see 34TELEMARKETING Host Connections Data Network Administration 36DATA Network Administration Data Communications Configurations DSC and PSC Connections DSC 4DATA Communications Configurations SNA Node Connections Video Teleconferencing Connections Through Public or Private Data NetworksFile Transfers Image Processing FAX Transmittal8DATA Communications Configurations Related Documents GeneralOperation Reference2RELATED Documents Related Documents Dimension AdministrationSystem 75 and Generic 6RELATED Documents System 85 and Generic ServiceSales 8RELATED Documents Sales 10RELATED Documents Synchronization of Digital Facilities Need for SynchronizationFigure B-1.Options for Synchronization Synchronization Hierarchy 4SYNCHRONIZATION of Digital Facilities Synchronization of Digital Facilities ∙ DDS Figure B-3.Stratum Levels for the Synchronization Hierarchy System 85 and Generic 2 Synchronization ArchitecturePage Primary Primary Secondary Reference Indicators ⎜ Reference ⎜ IndicatorsRED YEL Good LOS Misf ⎜ Blue REDSystem 75 and Generic 1 Synchronization Architecture Figure B-6.Tone-Clock Synchronizer Nonduplicated, Generic System 75 and Generic 1 Synchronization Software OperationCriteria for Switching to the Secondary Reference Criteria for Switching Back to the Primary ReferenceExternal Synchronization Clock CROSS-CONNECT B25A Cable Output Figure B-9.External-Clock Interface Selecting a Timing Source for the Switch Network Synchronization and EngineeringInternal Reference Selection Rules RuleExample for Rule Figure B-13.Proper Use of Backup Facilities Page Figure B-15.Optimal Diverse Routing Figure B-16.Less Than Optimal Diverse Routing Figure B-17.Excessive Cascading Figure B-19.Excessive Synchronization from One Node External-Reference Selection Rules Rules 2 ThroughFact Availability of Synchronization SourcesMisconception Line-Only Mode DS1/DMI-BOS ANN11 or TN767 Conclusions on SynchronizationUSE of Generic 2 AS a System Clock Reference ISDN-PRI Trunk FacilitiesLine+Trunk Mode DS1/DMI-BOS ANN35 or TN767 with TN555 DMI-MOS ANN35 or TN767 with TN555USE of Generic 1 AS a System Clock Reference Trunk-Mode ISDN-PRI TN767Trunk-Mode DS1/DMI-MOS TN767 Line-Only Mode DS1/DMI-BOS TN767Trunk-Mode Interface ISDN-PRI + Robbed Bit TN767 32SYNCHRONIZATION of Digital Facilities Wire Tie Trunk Address SignalingTrunking Terms and Capabilities Frequently Used TermsAlerting Signals APLT-Advanced Private Line TerminationAuto or Automatic-incoming Auto or Automatic-outgoingCcsa or Common Control Switching Arrangement CX Signaling or Composite SignalingCustomer Provided Access Cut-Through Mode of OperationDelay-Dial Delay-Dial IncomingDelay-Dial Outgoing Delay-Dial Start-Dial DdsdDerived E&M Lead Signaling Designed TrunksDial Repeating Tie Trunk Dial-PulseDirect Access Epscs or Enhanced Private Switched Communications ServiceLead Signaling or Ear & Mouth Signaling Standard or Type 1A and Type I compatible or Type 1BETN Trunking Facilities FX or Foreign ExchangeGlare Detection Glare ResolutionGlare Ground Start High-Usage Trunk GroupImmediate Start Immediate Start IncomingInterdigit Time-out Intermediate High-Usage Trunk GroupIntermachine Trunk IMT Intertandem TrunkOut-of-Band Signaling Party Test SignalMain PBX Main-Satellite TrunksReverse Battery SF or Single Frequency signalingSenderized Mode of Operation Signal ConverterSignaling Type Special Access ConnectionsStop-Go Signaling Supervisory SignalingTouch-Tone Signaling Trunk Type or trunk group typeType of Dialing Type of OutpulsingWink-Start Outgoing Wats Wide Area Telephone Service TrunkWink-Start Incoming Suggestions and Helpful Hints Trunking Characteristics Table Signaling TypesSwitch a Supervision Signaling Tion GenericSystem 85, or Dimension PBX ⎜GROUP/CALL TypeSwitch B GROUP/CALL TypeIN/DID DOD23/FX-DOD OUT GROUP/CALL Type Signaling 28/WATS-DOD OUT 26/WATS27/WATS OUT ⎜⎜ E&M 35/TIE ESS 5ESS ⎜OTHER ⎜ LS ⎜ RB ⎜ System 85, or ⎜DIMENSION PBX ⎜ ⎜57/CAS RLT-OUTGOING From Branch ⎜66/CAS RLT-INCOMING Main Satellite⎜DIAL-TONE with Digital Data ⎜DATA Module Side 103/HOST Access Line Side 104/HOST AccessAnalog Data Modem Side Trunk SideOther 32TRUNKING Terms and Capabilities Communications Protocols OSI Model Physical LayerData-Link Layer Network LayerPage Figure D-1.OSI Reference Model Session Layer Presentation LayerApplication Layer Standard ProtocolsTable D-1.Some Ccitt Digital Standards Table D-2.Some Ccitt Analog Standards Ccitt X.26 RS-423A FED-STDTable D-2.Some Ccitt Analog Standards Other Common Standards CCITT-ISOAT&T Protocols EIAData Modes Data Mode CapabilitiesDigital Multiplexed Interface Applications DescriptionControl Data DCP DS1/DMI/BOS Channel 14COMMUNICATIONS Protocols Communications Protocols Flag Digital Communications Protocol Or multipoint BX.25 Communication Pathways and Endpoints Message, Packet, and Frame SldhLead Definitions SCF SCBSBA SBBRL/CG CH/CISDA STARDA RSADPR ACRCRQ PNDBBA BBBDDA DDB⎜ PIN 8LEAD Definitions Networking FEATURES--AVAILABILITY Matrix ⎜⎜ R1 Networking FEATURES--AVAILABILITY Matrix Contd ⎜ NA ⎜ Uniform Numbering ⎜ Plan Note 6NETWORKING FEATURES--AVAILABILITY Matrix Abbreviations CRC CSMCSU DACETA ETNFAX FEPMpdm MS/TMtdm NCPSDN SMTSNA TehoAB-6ABBREVIATIONS Glossary ACUADM AVDADS Also high-volume tandem Audix StandaloneAutomatic Alternate Routing AARService Bccos Bipolar signalBit-oriented signaling Message-oriented signalingCPU BSCCcitt Ccis CORCOS CPESee network channel-terminating equipment See data communications equipmentDciu link DCP DCSDCS cluster DCS node See bit rateDDC DDDSee digital telephone DCS DMI-BOS DMI-MOSDMI/MOS DS1Error-free second ESS electronic switchingCommunications systems and switch Framing format Extended trunk accessBX.25 DCIU/PI Hdlc See basic rate interface See primary rate interface Keyboard dialing Kilo bits per second kbpsLAN Lapd Listed directory number Local area network LANAlso wide area network Local exchange companyNcte NAUPAD PVC PDM921, and signaling system number Remote access trunkRobbed-bit signaling Protocol converter PCSdlc TDM UCD UNPService Wats trunk Telecommunications ServiceWats Wide Area TelecommunicationsIndex Bypass access trunk 1-37,4-7,4-8,5-1,5-4,C-2 IN-2 IndexARS 2-4,2-7,2-8,2-14plan Logical 6-3,D-19restricted 1-20unrestrictedDial access code 2-2,2-5,2-10,2-13,2-17,3-1,4-4 CRC 1-25CSMA/CD 8-13CSUChannel bank 1-9,1-10,1-29,1-30,B-20frame DAC 2-2,2-5,2-10,2-13,2-17,3-1,4-4,4-7,4-8,4-9,6-23Mode 1-15,1-16,1-42,2-13,9-1MOS 6digitizerDMI 1-14, D-11 DS1-ContdD4 1-24, 1-27 ESF 1-24, 1-27FRL 2-10, 2-13 Gateway 7-2Statistical 1-17,1-18,1-34 LOS B-9,B-13 LWC 6-18,6-21,6-24DCS 1-36,2-3,5-14 ETN 1-36,2-2,2-8,3-1,4-1,5-1,6-1PAD 7-2,8-21 PCM 1-5,1-7,1-14,1-18,B-1Analog 1-7,9-2trunk DS1 1-13,1-16,1-18RS-232C1-13,D-9 Physical layer 1-11,1-15,D-2,D-9PRI 1-13, D-11 RS-232C1-13,6-3RNX 2-10 Subnet trunking 2-11, 2-14, 4-91-39, C-3, C-5, C-6 Intelligent main 2-4, 4-4, 4-7Analog 1-3,7-2,7-4 Bypass access 1-37,4-7,4-8,5-1,5-4 T1 carrier 1-6,1-18,1-32TCM 2-11,6-23 ﬁnal 5-2,C-9Uniform dial plan 2-5, 2-8, 2-9 Analog 1-9Uniform numbering 2-8, 5-1, 5-5 Auxiliary 1-10, 1-35IN-12 Index