Manuals / AT&T / Computer Equipment / Network Router

AT&T 7100 series, 7500 series, 2500 series, 7200 series manual System 75/G1 Signaling Channel DCP

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

1 348

Download 348 pages 35.19 Kb

Page 127

DISTRIBUTED COMMUNICATIONS SYSTEM (DCS)

6-9

_______________________________________________________________________________________

_

PI

TN764

(DIGITAL LINE)

TN760

(TIE TRUNK)

TN722

OR TN767

(DS1)

SYSTEM 75/G1

		SIGNALING CHANNEL
DCP		RS232		DCP
DCP	RS232	MODEM	MTDM	DCP
MTDM	RS232	MODEM
MTDM		MODEM
		ANALOG OR DS1 VOICE CHANNEL

PI

TN764

(DIGITAL LINE)

TN760

(TIE TRUNK)

TN722

OR TN767

(DS1)

SYSTEM 75/G1

Figure 6-7.Long Haul Analog Signaling: System 75/G1 to System 75/G1 Via Modem

PI		PI
	24th CHANNEL SIGNALING
TN722		TN722
OR TN767		OR TN767
(DS1)	USING AVD DS1	(DS1)
	CSU MAY BE REQ’D AT BOTH ENDS
	IF COMMON CARRIER USED
SYSTEM 75/G1		SYSTEM 75/G1

Figure 6-8.Long Haul Digital Signaling: System 75/G1 to System 75/G1 Via AVD DS1

PI	PI
ISDN PRI*
TN767	TN767
(PRI)	(PRI)
SYSTEM 75/G1	SYSTEM 75/G1
*ONE OF THE 23 B-CHANNELS IS USED FOR DCS SIGNALING: THE REMAINING 22 CHANNELS CAN BE USED FOR VOICE.

Figure 6-9.Long Haul Digital Signaling: System 75/G1 to System 75/G1 Via ISDN PRI

Image 127

AT&T 7100 series, 7500 series, 2500 series, 7200 series, 7400 series, 7300 series manual System 75/G1 Signaling Channel DCP

Contents

Definity Communications System Page Contents Communication System Networking AN Overview Multiplexing Outside the SwitchTandem TIE Trunk Networks Data Connectivity AN Overview Distributed Communications System DCSData Communications Capabilities Special Data FeaturesRelated Documents Synchronization of Digital Facilities Data Communications ConfigurationsGlossary Trunking Terms and Capabilities Communications ProtocolsIndex List of Figures Mpdm DSUFigure B-1 Options for Synchronization Figure B-11 External and Internal Reference Levels BCC List of TablesEIA RS-366 LEADS/DEFINITIONS EIA RS-232C V.28 LEADS/DEFINITIONSEIA RS-232D V.28 LEADS/DEFINITIONS EIA RS-449 V.24 LEADS/DEFINITIONSXvi Contents Prerequisite Skills and Knowledge About this DocumentDocument Organization ∙ Glossary ∙ Index PartAT&T HOW to Make Comments about this DocumentXx about this Document Introduction to Connectivity 2INTRODUCTION to Connectivity Analog Transmission Transmission TypesDigital Transmission Analog-to-Digital Conversion Analog VS. Digital 6TRANSMISSION Types Transmission States Entering the SwitchVoice Transmission 8TRANSMISSION States Digital Switch ⎜ Module Exiting the SwitchCircuit Packs Protocol Layers Data Transmission12TRANSMISSION States Originating Switch Destination Layer 1 Protocols Protocols UsedProtocol States Layer 2 ProtocolsConnectivity Rules ⎜DMI Mode Code16TRANSMISSION States Time-Division Multiplexing Multiplexed CommunicationTypes of Multiplexing Frequency-Division MultiplexingMultiplexing Over DS1 Facilities Statistical MultiplexingAlternating Mark Inversion Line CodingZero Code Suppression ZCS Line Coding B8ZS Line Coding Restricted ⎜ Unrestricted Signal Inversion⎜ DMI 7Data-Module Capabilities Part 2 Framing D4 FramingD4 Framing SignalingESF Framing Robbed-Bit Signaling ⎜ Frame No 24th-Channel Signaling⎜ Channels 24th Channel ⎜ 24th Channel ESF⎜ DMI-BOS Trunk Types/Destinations ⎜ Signaling Types⎜ Isdn PRI Multiplexing onto T1 Trunks Multiplexing Outside the SwitchCDM CEM Host Digital DMI PBX Getting the Signal Ready for the Central Ofﬁce Compressing the SignalAltering Channel Assignments on T1 Trunks Demultiplexing Multiplexing with MicrowaveMicrowave System T1 Trunk Capacity DR23N DR18M DR18W DR23W10.Possible Multiplexed Connections Statistical Multiplexing Application TrunkingLocal Exchange Trunks Tie Trunks Release Link Trunks RLTs Special-Access TrunksAuxiliary Trunks Miscellaneous TrunksConnectivity Remote Access TrunksHost-Access Trunks Advanced Private Line Termination Aplt TrunksSystem 85/G2 Administration Administration OptionsSignaling Types Trunk Type Signaling ProtocolsDS1 Options System 75/G1 AdministrationComm Type Group TypeTrunk Tables Interface CircuitTrunking 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 Capabilities Software ⎜ Network Type S75/G1 S85/G2 PackagePEC DCSSystem 75 and Generic 1 UDP Package System 75 and Generic 1 PNA Package DIMENSION, System 85, and Generic 2 Multipremises PackageNetwork Call Processing Distributed Communications SystemUniform Numbering Internal Dial PlanRouting the Call DAC + EXT To ARS Auxiliary Call Information Selecting a Routing Pattern Automatic Alternate Routing∙ RNX Modifying the Digits ∙ Where the trunk group appears in the list of preferencesSelecting a Trunk Group ∙ The FRL of the callAnalyzing the Dialed Number Automatic Route SelectionCommunication System Networking AN Overview To AAR Selecting the Routing Pattern Networking Feature Parameters Network AdministrationPrivate Network Trunks ⎜ Maap ⎜ Vmaap System Definity Feature PBX 20COMMUNICATION System Networking AN Overview Interactions with Other Networks Tandem TIE Trunk Networks2TANDEM TIE Trunk Networks Attendant Lines ⎜ Main Satellite ⎜ Trunks Main-Satellite Conﬁguration MS/T ConfigurationsMain-Tributary Conﬁguration MS/T Features Networking Package Multipremises with ETA Main Networking Package PNA, ETN Routing Outgoing Calls Routing Incoming CallsEngineering Considerations Other Routing CapabilitiesInteractions Page ETN Configurations ETN Trunks Page Access and Bypass Access Tie Trunks Off-Net Trunks FeaturesUniform Numbering Plan 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 ServiceMain-Satellite/Tributary Networks Distributed Communications System ClustersDistributed Communications System DCS DCS Clusters Switch Node CapacityDCS Links Signaling Link Protocol Signaling LinksSwitch Physical Links ⎜Logical Channels/Link Signaling Link SpeedTransmission Media Direct Link DCS Connections Linkage Design Distributed Communications System DCS System 75 or Generic 1 G1 to System 75 or G1 DCS Signaling Link ConnectionsEquipment Distance Limitation MTDM/MPDMSystem 75/G1 Signaling Channel DCP System 85 or Generic 2 G2 to System 85 or G2 MtdmModem System 75 or Generic 1 G1 to System 85 or Generic 2 G2 RS232C to RS449 Conversion Dciu Attendant Call Waiting Dimension Signaling LinksTransparent Features Transparent Attendant FeaturesAutomatic Circuit Assurance Attendant Control of Trunk Group Access⎜ ACA Alphanumeric DisplayCalling Number Display Class-of-Service/Restriction DisplayTrunk Group Busy/Warning Indicators Busy Veriﬁcation of Terminal LinesAlerting-Distinctive Ringing Transparent Voice Terminal FeaturesAutomatic Callback on Busy or No Answer Leave Word Calling LWC Without AP Call Coverage ToneCall Forwarding Call WaitingCall Transfer/Conference Audio Information Exchange Audix Features Transparency20.AUDIX in a DCS Network Definity PBX ⎜ Feature 22DISTRIBUTED Communications System DCS Distributed Communications System, Issue 3 Administration ConsiderationsDimension PBX Data Connectivity AN Overview Communications Protocols Data Communications VariablesDigital PBX Public Switched Network Pooled Modem Synchronous vs. Asynchronous Analog vs. DigitalSimplex vs. Half-Duplex vs. Full-Duplex ∙ ∙ ∙Transmission Speed Parallel vs. SerialType of Communications Channel Creating Switch Packet vs. Circuit SwitchesTransmission Mode Changes and Modem Pools Channel Information Bearer vs. Signaling ChannelsChannel Assignment Dial-up vs. Dedicated Connections Terminal Dialing Special Data FeaturesData Hot Line ⎜Data Services FeaturesData Call Setup From a Voice Terminal Computer DialingData Only Off-Premises Extension Data ProtectionData Privacy Data RestrictionOff-Premises Data-Only Extension Conﬁgurations Data Communications Capabilities 2DATA Communications Capabilities DTE Compatibility DTE ConnectionsProtocol Converters PC/PBX or PC/ISDN Terminal EmulatorsData Modules DCE PossibilitiesVoice Terminal Adjunct Data Modules Modems Data Module CharacteristicsStandalone Data Modules ADUsDTE Connections Dtdm PC/ISDN ⎜ PC/PBXPC/PBX ADMModem Pooling Connections DCP TIP-RING 12DTE Connections Data Module LAN Topology Local Area Network ConnectionsLAN Protocol LAN Transmission Media LAN ConnectorsAdvantages of a Communications System in a LAN Environment LAN System Software Access to/from LANs That Use Other Operating SystemsType Operating Gateway PC LANLocal Area Network Connections Remote PC Communication Between the LAN and Other Networks ISN CommunicationX.25 Router System Package Type Operating CommunicationsSNA Gateway 12.LAN/SNA Connectivity Communication System as a LAN BackupPublic Data Networks Accunet Packet ServiceAPS Access Public and Private Data Network ConnectionsSDS and Sddn Applications Circuit-Switched Public Data NetworksPublic and Private Data Network Connections MPDM/M1 Public and Private Data Network Connections DTE Mpdm Terrestrial Private Data Network Links Private Data NetworksPrivate Connections Through Accunet T1.5 and T45 MPDM/M1* AMI 28PUBLIC and Private Data Network Connections ⎜AMI Satellite Private Data Network Links Isdn Gateway Telemarketing Host ConnectionsIntegrated Telemarketing 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 File Transfers Connections Through Public or Private Data NetworksVideo Teleconferencing FAX Transmittal Image Processing8DATA Communications Configurations Reference Related DocumentsGeneral Operation2RELATED Documents Related Documents Administration DimensionSystem 75 and Generic 6RELATED Documents Sales ServiceSystem 85 and Generic 8RELATED Documents Sales 10RELATED Documents Need for Synchronization Synchronization of Digital FacilitiesFigure 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 ⎜ Blue RED Primary Secondary Reference Indicators ⎜ Reference⎜ Indicators RED YEL Good LOS MisfSystem 75 and Generic 1 Synchronization Architecture System 75 and Generic 1 Synchronization Software Operation Figure B-6.Tone-Clock Synchronizer Nonduplicated, GenericCriteria for Switching Back to the Primary Reference Criteria for Switching to the Secondary ReferenceExternal Synchronization Clock CROSS-CONNECT B25A Cable Output Figure B-9.External-Clock Interface Network Synchronization and Engineering Selecting a Timing Source for the SwitchRule Internal Reference Selection RulesExample 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 RulesMisconception Availability of Synchronization SourcesFact ISDN-PRI Trunk Facilities Line-Only Mode DS1/DMI-BOS ANN11 or TN767Conclusions on Synchronization USE of Generic 2 AS a System Clock ReferenceTrunk-Mode ISDN-PRI TN767 Line+Trunk Mode DS1/DMI-BOS ANN35 or TN767 with TN555DMI-MOS ANN35 or TN767 with TN555 USE of Generic 1 AS a System Clock ReferenceTrunk-Mode Interface ISDN-PRI + Robbed Bit TN767 Line-Only Mode DS1/DMI-BOS TN767Trunk-Mode DS1/DMI-MOS TN767 32SYNCHRONIZATION of Digital Facilities Frequently Used Terms Wire Tie TrunkAddress Signaling Trunking Terms and CapabilitiesAuto or Automatic-outgoing Alerting SignalsAPLT-Advanced Private Line Termination Auto or Automatic-incomingCut-Through Mode of Operation Ccsa or Common Control Switching ArrangementCX Signaling or Composite Signaling Customer Provided AccessDelay-Dial Start-Dial Ddsd Delay-DialDelay-Dial Incoming Delay-Dial OutgoingDial-Pulse Derived E&M Lead SignalingDesigned Trunks Dial Repeating Tie TrunkStandard or Type 1A and Type I compatible or Type 1B Direct AccessEpscs or Enhanced Private Switched Communications Service Lead Signaling or Ear & Mouth SignalingFX or Foreign Exchange ETN Trunking FacilitiesGlare Glare ResolutionGlare Detection Immediate Start Incoming Ground StartHigh-Usage Trunk Group Immediate StartIntertandem Trunk Interdigit Time-outIntermediate High-Usage Trunk Group Intermachine Trunk IMTMain-Satellite Trunks Out-of-Band SignalingParty Test Signal Main PBXSignal Converter Reverse BatterySF or Single Frequency signaling Senderized Mode of OperationSupervisory Signaling Signaling TypeSpecial Access Connections Stop-Go SignalingType of Outpulsing Touch-Tone SignalingTrunk Type or trunk group type Type of DialingWink-Start Incoming Wats Wide Area Telephone Service TrunkWink-Start Outgoing Suggestions and Helpful Hints Signaling Types Trunking Characteristics Table⎜GROUP/CALL Type Switch aSupervision Signaling Tion Generic System 85, or Dimension PBXGROUP/CALL Type Switch B23/FX-DOD OUT DODIN/DID GROUP/CALL Type Signaling 27/WATS OUT 26/WATS28/WATS-DOD 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 Trunk Side Digital Data ⎜DATA Module Side 103/HOST AccessLine Side 104/HOST Access Analog Data Modem SideOther 32TRUNKING Terms and Capabilities Communications Protocols Network Layer OSI ModelPhysical Layer Data-Link LayerPage Figure D-1.OSI Reference Model Standard Protocols Session LayerPresentation Layer Application LayerTable D-1.Some Ccitt Digital Standards Ccitt X.26 RS-423A FED-STD Table D-2.Some Ccitt Analog StandardsTable D-2.Some Ccitt Analog Standards CCITT-ISO Other Common StandardsEIA AT&T ProtocolsDigital Multiplexed Interface Data Mode CapabilitiesData Modes Description ApplicationsControl 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 FrameLead Definitions SBB SCFSCB SBACH/CI RL/CGRSA SDASTA RDAPND DPRACR CRQDDB BBABBB DDA⎜ PIN 8LEAD Definitions Networking FEATURES--AVAILABILITY Matrix ⎜⎜ R1 Networking FEATURES--AVAILABILITY Matrix Contd ⎜ NA ⎜ Uniform Numbering ⎜ Plan Note 6NETWORKING FEATURES--AVAILABILITY Matrix Abbreviations DAC CRCCSM CSUFEP ETAETN FAXNCP MpdmMS/T MtdmTeho SDNSMT SNAAB-6ABBREVIATIONS AVD GlossaryACU ADMADS Routing AAR Also high-volume tandemAudix Standalone Automatic AlternateMessage-oriented signaling Service BccosBipolar signal Bit-oriented signalingCcitt BSCCPU CPE CcisCOR COSSee data communications equipment See network channel-terminating equipmentSee bit rate Dciu linkDCP DCS DCS cluster DCS nodeDDD DDCSee digital telephone DS1 DCS DMI-BOSDMI-MOS DMI/MOSFraming format Extended trunk access Error-free secondESS electronic switching Communications systems and switchBX.25 DCIU/PI Hdlc LAN Lapd Keyboard dialing Kilo bits per second kbpsSee basic rate interface See primary rate interface Local exchange company Listed directory numberLocal area network LAN Also wide area networkNAU NctePAD PDM PVCProtocol converter PC 921, and signaling system numberRemote access trunk Robbed-bit signalingSdlc TDM UNP UCDTelecommunications Service Wats trunkTelecommunications Service Wats Wide AreaIndex Logical 6-3,D-19restricted 1-20unrestricted Bypass access trunk 1-37,4-7,4-8,5-1,5-4,C-2IN-2 Index ARS 2-4,2-7,2-8,2-14planDAC 2-2,2-5,2-10,2-13,2-17,3-1,4-4,4-7,4-8,4-9,6-23 Dial access code 2-2,2-5,2-10,2-13,2-17,3-1,4-4CRC 1-25CSMA/CD 8-13CSU Channel bank 1-9,1-10,1-29,1-30,B-20frameDS1-Contd Mode 1-15,1-16,1-42,2-13,9-1MOS6digitizer DMI 1-14, D-11Gateway 7-2 D4 1-24, 1-27ESF 1-24, 1-27 FRL 2-10, 2-13ETN 1-36,2-2,2-8,3-1,4-1,5-1,6-1 Statistical 1-17,1-18,1-34LOS B-9,B-13 LWC 6-18,6-21,6-24 DCS 1-36,2-3,5-14DS1 1-13,1-16,1-18 PAD 7-2,8-21PCM 1-5,1-7,1-14,1-18,B-1 Analog 1-7,9-2trunkRS-232C1-13,6-3 RS-232C1-13,D-9Physical layer 1-11,1-15,D-2,D-9 PRI 1-13, D-11Intelligent main 2-4, 4-4, 4-7 RNX 2-10Subnet trunking 2-11, 2-14, 4-9 1-39, C-3, C-5, C-6ﬁnal 5-2,C-9 Analog 1-3,7-2,7-4 Bypass access 1-37,4-7,4-8,5-1,5-4T1 carrier 1-6,1-18,1-32 TCM 2-11,6-23Auxiliary 1-10, 1-35 Uniform dial plan 2-5, 2-8, 2-9Analog 1-9 Uniform numbering 2-8, 5-1, 5-5IN-12 Index