Manuals / AT&T / Computer Equipment / Network Router

AT&T 7200 series, 7500 series, 7100 series, 2500 series Local Area Network Connections Remote PC

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

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	LOCAL AREA NETWORK CONNECTIONS			8-17
_______________________________________________________________________________________
_
REMOTE PC	S75/85/G1/G2
(RPC) CLIENT	S75/85/G1/G2
		LAN MANAGER
	7400B	REMOTE
	7400B	GATEWAY
		GATEWAY
	7400A/	6386 PC	LAN
	ADU/	6386 PC	WITH
	MADU		StarGROUP
REMOTE PC
(RPC) CLIENT
(OFF PREMISES)	MODEM
	MODEM
	POOL
	MODEM

Figure 8-7.Outside PC Access to a LAN Operating with StarGROUP Software

		ASYNCH
	TERMINAL/PC
			7400B	S75/85/G1/G2
			7400B
LAN	ASYNCHRONOUS				7400A/B/
WITH	GATEWAY	7400B			ADU/
StarGROUP	SERVER				MADU
CLIENT					ASYNCH
WORKSTATION					HOST
					EXTERNAL
				MODEM	ASYNCHRONOUS
				MODEM	HOST
				POOL	HOST
				POOL	(E.G. COMPUSERV)
					(E.G. COMPUSERV)

Figure 8-8.Asynchronous Communications from LANs Operating with StarGROUP Software

running communications software similar to those shown in table 8-4.

Note that the number of simultaneous connections the gateway can support, the speed of the connections, and the software that the remote (client) PC must be running vary with the gateway PC software and hardware constraints. Check the gateway software documentation for these particulars.

Image 171

AT&T 7200 series, 7500 series, 7100 series, 2500 series, 7400 series, 7300 series Local Area Network Connections Remote PC

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 ConfigurationsTrunking Terms and Capabilities Communications Protocols GlossaryIndex 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 About this Document Prerequisite Skills and KnowledgeDocument Organization ∙ Glossary ∙ Index PartAT&T HOW to Make Comments about this DocumentXx about this Document Introduction to Connectivity 2INTRODUCTION to Connectivity Transmission Types Analog TransmissionDigital Transmission Analog-to-Digital Conversion Analog VS. Digital 6TRANSMISSION Types Entering the Switch Transmission StatesVoice 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 MultiplexingLine Coding Alternating Mark InversionZero Code Suppression ZCS Line Coding B8ZS Line Coding Restricted ⎜ Unrestricted Signal Inversion⎜ DMI 7Data-Module Capabilities Part 2 Framing D4 FramingSignaling D4 FramingESF Framing Robbed-Bit Signaling ⎜ Frame No 24th-Channel Signaling⎜ Channels 24th Channel ⎜ 24th Channel ESFTrunk Types/Destinations ⎜ Signaling Types ⎜ DMI-BOS⎜ Isdn PRI Multiplexing onto T1 Trunks Multiplexing Outside the SwitchCDM CEM Host Digital DMI PBX Compressing the Signal Getting the Signal Ready for the Central OfﬁceAltering Channel Assignments on T1 Trunks Demultiplexing Multiplexing with MicrowaveMicrowave System T1 Trunk Capacity DR23N DR18M DR18W DR23W10.Possible Multiplexed Connections Statistical Multiplexing Trunking ApplicationLocal Exchange Trunks Tie Trunks Release Link Trunks RLTs Special-Access TrunksAuxiliary Trunks Miscellaneous TrunksConnectivity Remote Access TrunksHost-Access Trunks Advanced Private Line Termination Aplt TrunksAdministration Options System 85/G2 AdministrationSignaling 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 SystemInternal Dial Plan Uniform NumberingRouting 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 Network Administration Networking Feature ParametersPrivate 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 Features Off-Net TrunksUniform 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 Switch Node Capacity DCS ClustersDCS 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 LinesTransparent Voice Terminal Features Alerting-Distinctive RingingAutomatic 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 SwitchesChannel Information Bearer vs. Signaling Channels Transmission Mode Changes and Modem PoolsChannel 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 Connections DTE CompatibilityProtocol Converters PC/PBX or PC/ISDN Terminal EmulatorsDCE Possibilities Data ModulesVoice 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 Local Area Network Connections LAN TopologyLAN Protocol LAN Connectors LAN Transmission MediaAdvantages 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 ISN Communication Communication Between the LAN and Other NetworksX.25 Router Type Operating Communications System PackageSNA 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 Private Data Networks Terrestrial Private Data Network LinksPrivate Connections Through Accunet T1.5 and T45 MPDM/M1* AMI 28PUBLIC and Private Data Network Connections ⎜AMI Satellite Private Data Network Links Telemarketing Host Connections Isdn GatewayIntegrated 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 Connections Through Public or Private Data Networks File TransfersVideo Teleconferencing FAX Transmittal Image Processing8DATA Communications Configurations Reference Related DocumentsGeneral Operation2RELATED Documents Related Documents Administration DimensionSystem 75 and Generic 6RELATED Documents Service SalesSystem 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 RulesAvailability of Synchronization Sources MisconceptionFact 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 ReferenceLine-Only Mode DS1/DMI-BOS TN767 Trunk-Mode Interface ISDN-PRI + Robbed Bit 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 Resolution GlareGlare 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 DialingWats Wide Area Telephone Service Trunk Wink-Start IncomingWink-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 BDOD 23/FX-DOD OUTIN/DID GROUP/CALL Type Signaling 26/WATS 27/WATS OUT28/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 ProtocolsData Mode Capabilities Digital Multiplexed InterfaceData 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 signalingBSC CcittCPU 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 Keyboard dialing Kilo bits per second kbps LAN LapdSee 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