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AT&T 7300 series, 7500 series, 7100 series manual Generic 1 and Generic 2 Digital Trunks Voice BCC

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TRUNKING 1-45

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Table 1-11.Generic 1 and Generic 2 Digital Trunks — Voice BCC

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AT&T 7300 series, 7500 series, 7100 series, 2500 series, 7200 series manual Generic 1 and Generic 2 Digital Trunks Voice BCC

Contents

Definity Communications System Page Contents Communication System Networking AN Overview Multiplexing Outside the Switch Tandem TIE Trunk Networks Data Connectivity AN Overview Distributed Communications System DCS Data Communications Capabilities Special Data Features Related Documents Synchronization of Digital Facilities Data Communications Configurations Index Trunking Terms and Capabilities Communications ProtocolsGlossary List of Figures Mpdm DSU Figure B-1 Options for Synchronization Figure B-11 External and Internal Reference Levels BCC List of Tables EIA RS-232D V.28 LEADS/DEFINITIONS EIA RS-232C V.28 LEADS/DEFINITIONSEIA RS-449 V.24 LEADS/DEFINITIONS EIA RS-366 LEADS/DEFINITIONS Xvi Contents Document Organization About this DocumentPrerequisite Skills and Knowledge ∙ Glossary ∙ Index Part AT&T HOW to Make Comments about this Document Xx 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 ⎜ Module Exiting the Switch Circuit Packs Protocol Layers Data Transmission 12TRANSMISSION States Originating Switch Destination Layer 1 Protocols Protocols Used Protocol States Layer 2 Protocols Connectivity Rules ⎜DMI Mode Code 16TRANSMISSION States Types of Multiplexing Multiplexed CommunicationFrequency-Division Multiplexing Time-Division Multiplexing Multiplexing Over DS1 Facilities Statistical Multiplexing Zero Code Suppression ZCS Line Coding Line CodingAlternating Mark Inversion B8ZS Line Coding Restricted ⎜ Unrestricted Signal Inversion ⎜ DMI 7Data-Module Capabilities Part 2 Framing D4 Framing ESF Framing SignalingD4 Framing Robbed-Bit Signaling ⎜ Channels 24th Channel ⎜ 24th Channel 24th-Channel SignalingESF ⎜ Frame No ⎜ Isdn PRI Trunk Types/Destinations ⎜ Signaling Types⎜ DMI-BOS Multiplexing onto T1 Trunks Multiplexing Outside the Switch CDM CEM Host Digital DMI PBX Altering Channel Assignments on T1 Trunks Compressing the SignalGetting the Signal Ready for the Central Ofﬁce Microwave System T1 Trunk Capacity Multiplexing with MicrowaveDR23N DR18M DR18W DR23W Demultiplexing 10.Possible Multiplexed Connections Statistical Multiplexing Local Exchange Trunks TrunkingApplication Tie Trunks Auxiliary Trunks Special-Access TrunksMiscellaneous Trunks Release Link Trunks RLTs Host-Access Trunks Remote Access TrunksAdvanced Private Line Termination Aplt Trunks Connectivity Signaling Types Administration OptionsSystem 85/G2 Administration Trunk Type Signaling Protocols Comm Type System 75/G1 AdministrationGroup Type DS1 Options Trunk Tables Interface Circuit Trunking 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 PEC Software ⎜ Network Type S75/G1 S85/G2 PackageDCS Software Capabilities System 75 and Generic 1 UDP Package System 75 and Generic 1 PNA Package DIMENSION, System 85, and Generic 2 Multipremises Package Network Call Processing Distributed Communications System Routing the Call Internal Dial PlanUniform Numbering DAC + EXT To ARS Auxiliary Call Information Selecting a Routing Pattern Automatic Alternate Routing ∙ RNX Selecting a Trunk Group ∙ Where the trunk group appears in the list of preferences∙ The FRL of the call Modifying the Digits Analyzing the Dialed Number Automatic Route Selection Communication 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 Interactions with Other Networks Tandem TIE Trunk Networks 2TANDEM TIE Trunk Networks Attendant Lines ⎜ Main Satellite ⎜ Trunks Main-Satellite Conﬁguration MS/T Configurations Main-Tributary Conﬁguration MS/T Features Networking Package Multipremises with ETA Main Networking Package PNA, ETN Routing Outgoing Calls Routing Incoming Calls Engineering Considerations Other Routing Capabilities Interactions 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 Automatic Call Distribution Centralized Attendant Service Main-Satellite/Tributary Networks Distributed Communications System Clusters Distributed Communications System DCS DCS Links Switch Node CapacityDCS Clusters Switch Physical Links ⎜Logical Channels/Link Signaling LinksSignaling Link Speed Signaling Link Protocol Transmission Media Direct Link DCS Connections Linkage Design Distributed Communications System DCS Equipment Distance Limitation DCS Signaling Link ConnectionsMTDM/MPDM System 75 or Generic 1 G1 to System 75 or G1 System 75/G1 Signaling Channel DCP System 85 or Generic 2 G2 to System 85 or G2 Mtdm Modem System 75 or Generic 1 G1 to System 85 or Generic 2 G2 RS232C to RS449 Conversion Dciu Transparent Features Dimension Signaling LinksTransparent Attendant Features Attendant Call Waiting ⎜ ACA Attendant Control of Trunk Group AccessAlphanumeric Display Automatic Circuit Assurance Trunk Group Busy/Warning Indicators Class-of-Service/Restriction DisplayBusy Veriﬁcation of Terminal Lines Calling Number Display Automatic Callback on Busy or No Answer Transparent Voice Terminal FeaturesAlerting-Distinctive Ringing Call Forwarding Call Coverage ToneCall Waiting Leave Word Calling LWC Without AP Call Transfer/Conference Audio Information Exchange Audix Features Transparency 20.AUDIX in a DCS Network Definity PBX ⎜ Feature 22DISTRIBUTED Communications System DCS Distributed Communications System, Issue 3 Administration Considerations Dimension PBX Data Connectivity AN Overview Communications Protocols Data Communications Variables Digital PBX Public Switched Network Pooled Modem Synchronous vs. Asynchronous Analog vs. Digital Simplex vs. Half-Duplex vs. Full-Duplex ∙ ∙ ∙ Transmission Speed Parallel vs. Serial Type of Communications Channel Creating Switch Packet vs. Circuit Switches Channel Assignment Dial-up vs. Dedicated Connections Channel Information Bearer vs. Signaling ChannelsTransmission Mode Changes and Modem Pools Terminal Dialing Special Data Features Data Call Setup From a Voice Terminal ⎜Data Services FeaturesComputer Dialing Data Hot Line Data Privacy Data ProtectionData Restriction Data Only Off-Premises Extension Off-Premises Data-Only Extension Conﬁgurations Data Communications Capabilities 2DATA Communications Capabilities Protocol Converters DTE ConnectionsDTE Compatibility PC/PBX or PC/ISDN Terminal Emulators Voice Terminal Adjunct Data Modules DCE PossibilitiesData Modules Standalone Data Modules Data Module CharacteristicsADUs Modems DTE Connections Dtdm PC/PBX ⎜ PC/PBXADM PC/ISDN Modem 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 Type Operating Gateway PC Access to/from LANs That Use Other Operating SystemsLAN System Software Local Area Network Connections Remote PC X.25 Router ISN CommunicationCommunication Between the LAN and Other Networks SNA Gateway Type Operating CommunicationsSystem Package 12.LAN/SNA Connectivity Communication System as a LAN Backup APS Access Accunet Packet ServicePublic and Private Data Network Connections Public Data Networks SDS and Sddn Applications Circuit-Switched Public Data Networks Public 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 FAX Transmittal Image Processing 8DATA Communications Configurations General Related DocumentsOperation Reference 2RELATED Documents Related Documents Administration Dimension System 75 and Generic 6RELATED Documents System 85 and Generic ServiceSales 8RELATED Documents Sales 10RELATED Documents Need for Synchronization Synchronization of Digital Facilities Figure B-1.Options for Synchronization Synchronization Hierarchy 4SYNCHRONIZATION of Digital Facilities Synchronization of Digital Facilities ∙ DDS System 85 and Generic 2 Synchronization Architecture Figure B-3.Stratum Levels for the Synchronization HierarchyPage Primary ⎜ Indicators Primary Secondary Reference Indicators ⎜ ReferenceRED YEL Good LOS Misf ⎜ Blue RED System 75 and Generic 1 Synchronization Architecture System 75 and Generic 1 Synchronization Software Operation Figure B-6.Tone-Clock Synchronizer Nonduplicated, Generic Criteria for Switching Back to the Primary Reference Criteria for Switching to the Secondary Reference External Synchronization Clock CROSS-CONNECT B25A Cable Output Figure B-9.External-Clock Interface Network Synchronization and Engineering Selecting a Timing Source for the Switch Rule Internal Reference Selection Rules Example 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 Rules 2 Through External-Reference Selection Rules Fact Availability of Synchronization SourcesMisconception Conclusions on Synchronization Line-Only Mode DS1/DMI-BOS ANN11 or TN767USE of Generic 2 AS a System Clock Reference ISDN-PRI Trunk Facilities DMI-MOS ANN35 or TN767 with TN555 Line+Trunk Mode DS1/DMI-BOS ANN35 or TN767 with TN555USE of Generic 1 AS a System Clock Reference Trunk-Mode ISDN-PRI TN767 Trunk-Mode DS1/DMI-MOS TN767 Line-Only Mode DS1/DMI-BOS TN767Trunk-Mode Interface ISDN-PRI + Robbed Bit TN767 32SYNCHRONIZATION of Digital Facilities Address Signaling Wire Tie TrunkTrunking Terms and Capabilities Frequently Used Terms APLT-Advanced Private Line Termination Alerting SignalsAuto or Automatic-incoming Auto or Automatic-outgoing CX Signaling or Composite Signaling Ccsa or Common Control Switching ArrangementCustomer Provided Access Cut-Through Mode of Operation Delay-Dial Incoming Delay-DialDelay-Dial Outgoing Delay-Dial Start-Dial Ddsd Designed Trunks Derived E&M Lead SignalingDial Repeating Tie Trunk Dial-Pulse Epscs or Enhanced Private Switched Communications Service Direct AccessLead Signaling or Ear & Mouth Signaling Standard or Type 1A and Type I compatible or Type 1B FX or Foreign Exchange ETN Trunking Facilities Glare Detection Glare ResolutionGlare High-Usage Trunk Group Ground StartImmediate Start Immediate Start Incoming Intermediate High-Usage Trunk Group Interdigit Time-outIntermachine Trunk IMT Intertandem Trunk Party Test Signal Out-of-Band SignalingMain PBX Main-Satellite Trunks SF or Single Frequency signaling Reverse BatterySenderized Mode of Operation Signal Converter Special Access Connections Signaling TypeStop-Go Signaling Supervisory Signaling Trunk Type or trunk group type Touch-Tone SignalingType of Dialing Type of Outpulsing Wink-Start Outgoing Wats Wide Area Telephone Service TrunkWink-Start Incoming Suggestions and Helpful Hints Signaling Types Trunking Characteristics Table Supervision Signaling Tion Generic Switch aSystem 85, or Dimension PBX ⎜GROUP/CALL Type GROUP/CALL Type Switch B IN/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 ⎜ Main Satellite ⎜57/CAS RLT-OUTGOING From Branch ⎜66/CAS RLT-INCOMING ⎜DIAL-TONE with Line Side 104/HOST Access Digital Data ⎜DATA Module Side 103/HOST AccessAnalog Data Modem Side Trunk Side Other 32TRUNKING Terms and Capabilities Communications Protocols Physical Layer OSI ModelData-Link Layer Network LayerPage Figure D-1.OSI Reference Model Presentation Layer Session LayerApplication Layer Standard Protocols Table D-1.Some Ccitt Digital Standards Ccitt X.26 RS-423A FED-STD Table D-2.Some Ccitt Analog Standards Table D-2.Some Ccitt Analog Standards CCITT-ISO Other Common Standards EIA AT&T Protocols Data Modes Data Mode CapabilitiesDigital Multiplexed Interface Description Applications Control Data DCP DS1/DMI/BOS Channel 14COMMUNICATIONS Protocols Communications Protocols Flag Digital Communications Protocol Or multipoint BX.25 Communication Pathways and Endpoints Sldh Message, Packet, and Frame Lead Definitions SCB SCFSBA SBB CH/CI RL/CG STA SDARDA RSA ACR DPRCRQ PND BBB BBADDA DDB ⎜ PIN 8LEAD Definitions Networking FEATURES--AVAILABILITY Matrix ⎜⎜ R1 Networking FEATURES--AVAILABILITY Matrix Contd ⎜ NA ⎜ Uniform Numbering ⎜ Plan Note 6NETWORKING FEATURES--AVAILABILITY Matrix Abbreviations CSM CRCCSU DAC ETN ETAFAX FEP MS/T MpdmMtdm NCP SMT SDNSNA Teho AB-6ABBREVIATIONS ACU GlossaryADM AVD ADS Audix Standalone Also high-volume tandemAutomatic Alternate Routing AAR Bipolar signal Service BccosBit-oriented signaling Message-oriented signaling CPU BSCCcitt COR CcisCOS CPE See data communications equipment See network channel-terminating equipment DCP DCS Dciu linkDCS cluster DCS node See bit rate DDD DDC See digital telephone DMI-MOS DCS DMI-BOSDMI/MOS DS1 ESS electronic switching Error-free secondCommunications systems and switch Framing format Extended trunk access BX.25 DCIU/PI Hdlc See basic rate interface See primary rate interface Keyboard dialing Kilo bits per second kbpsLAN Lapd Local area network LAN Listed directory numberAlso wide area network Local exchange company NAU Ncte PAD PDM PVC Remote access trunk 921, and signaling system numberRobbed-bit signaling Protocol converter PC Sdlc TDM UNP UCD Telecommunications Service Service Wats trunkWats Wide Area Telecommunications Index IN-2 Index Bypass access trunk 1-37,4-7,4-8,5-1,5-4,C-2ARS 2-4,2-7,2-8,2-14plan Logical 6-3,D-19restricted 1-20unrestricted CRC 1-25CSMA/CD 8-13CSU Dial access code 2-2,2-5,2-10,2-13,2-17,3-1,4-4Channel bank 1-9,1-10,1-29,1-30,B-20frame DAC 2-2,2-5,2-10,2-13,2-17,3-1,4-4,4-7,4-8,4-9,6-23 6digitizer Mode 1-15,1-16,1-42,2-13,9-1MOSDMI 1-14, D-11 DS1-Contd ESF 1-24, 1-27 D4 1-24, 1-27FRL 2-10, 2-13 Gateway 7-2 LOS B-9,B-13 LWC 6-18,6-21,6-24 Statistical 1-17,1-18,1-34DCS 1-36,2-3,5-14 ETN 1-36,2-2,2-8,3-1,4-1,5-1,6-1 PCM 1-5,1-7,1-14,1-18,B-1 PAD 7-2,8-21Analog 1-7,9-2trunk DS1 1-13,1-16,1-18 Physical layer 1-11,1-15,D-2,D-9 RS-232C1-13,D-9PRI 1-13, D-11 RS-232C1-13,6-3 Subnet trunking 2-11, 2-14, 4-9 RNX 2-101-39, C-3, C-5, C-6 Intelligent main 2-4, 4-4, 4-7 T1 carrier 1-6,1-18,1-32 Analog 1-3,7-2,7-4 Bypass access 1-37,4-7,4-8,5-1,5-4TCM 2-11,6-23 ﬁnal 5-2,C-9 Analog 1-9 Uniform dial plan 2-5, 2-8, 2-9Uniform numbering 2-8, 5-1, 5-5 Auxiliary 1-10, 1-35 IN-12 Index