Conclusions | AT&T AT&T specs

Types of trunks which can be assigned in System 25 are:

●Central Office, which provide a link with the local telco for incoming and outgoing calls (LS/GS)

●Foreign Exchange (FX), which connect to a CO other than the local CO for high

volume calling from a distant location

●Wide-Area Telecommunications Service (WATS), which connect to an Outward WATS office or a dial “800” Service Office

●Direct Inward Dial (DID), which provide incoming service from a CO to directly

access a station or facility (STARLAN NETWORK interface, trunk group)

●Tie trunks, which provide a link with another private switching system.

To support efficient utilization of this rich set of network options, System 25 provides the functions outlined in the Outgoing and Incoming Business Communications sections.

Conclusions

System 25 has been targeted at providing excellent small business communications capability at the right price. The thousands of systems in service in the first year of production have confirmed that these capabilities are an excellent match with small business customers’ communications needs.

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AT&T AT&T manual Conclusions

Contents

AT&T System 1987 AT&T All Rights Reserved To Order Copies of this Document Refer to Document Number Means of Connection Notification to the Telephone CompanyRepair Instructions Hearing AID Compatibility Private Line ServiceRights of the Telephone Company FCC Registration Information FCC Warning Statement Contents Section Overview Overview Organization System 25 Description Merlin System 25 Block Diagram Safety Call Handling CapabilitiesBusiness Communications Needs Incoming Business Communications DidPDC Outgoing Business Communications Internal Call Movement Data Communications Page Growth & Rearrangement Page Conclusions List of Figures Smdr BIS StarlanSAT LED Considerations Administration RequirementsDescription Interactions System Features Feature Name Type Feature Name Network FeaturesData Features Feature Station Features Feature Name SINGLE-LINE Multiline Terminal Button Label † Attendant Features Feature Name Console Button Label † Type Account Code Entry Interactions Attendant Call Extending Selector Console optional Attendant CAMP-ON Interactions Call Coverage/Direct Group Calling DGC If None Attendant Cancel Attendant CONSOLE, Direct Trunk Direct Trunk Attendant Console Dual Console Operation Position Busy System Assign Primary Secondary Attendant Direct Trunk Attendant Console Connections Attendant CONSOLE, Switched Loop Fixed Buttons Figure Programmable Feature Buttons Figure Attendant Message Waiting Attendant Message Waiting Used by DSS Display Figure Switched Loop Operation Console Buttons and Display Answering a Call on a Loop Button Placing a Call on a Loop Button Call Types Ringing Attendant Features Call Originations Switched Loop Attendant Console Connections Attendant Direct Extension Selection Model 23A1 Attendant Direct Extension Selector Console Considerations Attendant Direct Extension Selector Console Connections Attendant Display V2 Slac Only Call Information Display Incoming did call Incoming call from a system userIncoming coverage call Returning parked call Call from console to system userOutgoing trunk call Conference 3 Conference set up by attendantInspection Mode Conference 4 Timer Functions Attendant Forced Release V2 Slac Only Only Join Attendant Message Waiting Systems with Switched Loop Attendant Consoles Slac Systems with Direct Trunk Attendant Consoles Dtac Call Coverage Administration Requirements Manual Release Automatic Release Interactions Attendant Return Coverage on Busy Administration Requirements Attendant Return Coverage on DON’T Answer Administration Requirements Attendant Source and Destination V2 Slac Only Attendant Splitting ONE-WAY Automatic Systems Technician Automatic Intercom Administration Requirements Automatic Route Selection ARS ARS Flow Chart ARS Routing Pattern Table FRL Automatic Route Selection Flow Chart Sheet l Automatic Route Selection Flow Chart Sheet 2 0f Considerations ARS Hardware Requirements Automatic Route Selection Routing Pattern BUSY-TO-IDLE Reminder Call Accountability Call Accounting Page Facility Code #190-#199 is identified in this field Call Accounting System CAS CAS Model CAS Models 200, 300, 500,Page AT&T Call Accounting Systems CAS Model Stations Account Codes Date Time DUR FAC STN Account PDC Ascii Character Description Valid Position Characters Column Number Ascii Character Description Position 12. Smdr Call Record Header Format Z21OA Adapt 15. Smdr Output Equipment -On-Premises Switched Connections 16. Smdr Output Equipment-Off-Premises Direct Connections 17. Smdr Output Equipment-Off-Premises Switched Connections Standard Group Coverage DGC Group Coverage V2 only Page Administration Requirements Standard Group Coverage Interactions DGC Group Coverage V2 Only Administration Requirements DGC Group Coverage V2 Only Sent to coverage Call COVERAGE-INDIVIDUAL Call Coverage -Group Unanswered Call Following Forwarding Interactions Call Park Considerations Attendant Selector Console Assign Call Park buttons Directed Call Pickup Group Call Pickup Administration Requirements Call Progress Tones Facility Access Restriction Outward RestrictionToll Restriction ARS Restriction Hardware Requirements Data call or place Data call Voice call V2 only EXit Change options View options Options Current DefaultOptions Hangup Partial List of Permissible Data Port TN726 Options Option Definition Host Modem Computer Users 18. Communications Access Manager Architecture Page Multiline Voice Terminals Single-Line Voice Terminals101 Extended Stations An 102 All Multiline Terminals Switched Loop Attendant ConsolesMultiline Voice Terminals except Slac 103 104 Data Call Setup Data Endpoints DTE Devices106 Data Terminal Without Ascii Keyboard Ascii Data Terminal With Keyboard107 DCE Devices Host Computer EndpointAnalog Data Endpoint 108 Data Endpoint States Data Call Processing Modes Connecting Configurations Controlling Features 111 Pause Dialed CharactersDialing Correction 112 Answering Endpoint End-to-End SignalingCall Disposition 113 114 Interactions End-To-End Signaling See above text 115 Dial Code Assignments 116 Data Dial Codes DDCs Voice Terminal Directed FeaturesPDC to Voice Terminal Association Direct Inward Dial did Number Assignments 118 20. Dictation System Connections FCC Registered 119 21. Digital Tape Unit 120 121 122 123 Transfer For 124 125 23. Delay Announcement Equipment Connections FCC Registered 126 127 128 129 Access to Paging Zones and DGC Groups 130 131 132 133 134 Activating Expert Mode Making a Data Call135 User Changeable Options Activating the Third-Party Call Setup FeatureDial Examples Interactions Command Mode Command PECommand MY 137 Conference 138 139 24. External Alert Connections 140 25. Supplemental Alert Adapter Connections 141 Calls Eligible for Hands-Free Service BIS and Hfai Voice Terminals142 Voice Terminals with HFUs Voice Terminals without HFUs143 144 500A/502A Headset Adapters 145 MET Headset Adapter 146 147 148 149 150 151 152 153 154 Prime Line Preference Ringing Line Preference155 Preselection 156 Use Line Status Meaning Red LED Green LED L-USE IndicationsLED Indications 157 158 159 Message Center Call Types Console ConfigurationsMessage CENTER-LIKE Operation V2 Slac Only 160 161 Attendant Message Waiting Call Coverage Message Waiting162 Station-To-Station Message Waiting 163 164 Calling Restrictions 165 166 167 30. Music-On-Hold Equipment Connections FCC Registered 168 31. Music-On-Hold Equipment Connections Non-Registered 169 Directed NS 170 Trunk-Answer-from-Any-Station 171 172 AT&T 173 32. Delay Announcement Equipment Connections FCC Registered 174 175 176 177 178 179 180 Calls Placed to a PDC 181 Calls Placed to a Floating PDC 182 Direct Station Selection 183 184 185 186 Facility 187 188 189 190 35 B Emergency Transfer Unit ETU 36. Emergency Transfer Unit Connections 192 37. Multiple ETU Arrangements 193 CHAR. Used in Personal Speed Dialing Numbers Special CharactersChar Used in Repertory Dialing Numbers 194 Char Used in Personal Speed Dialing Numbers Transmits an actual195 To Program a Number by Using a Code To Program a Number by Using the Switch196 197 198 199 200 201 202 203 204 205 Speaker 4A Speakerphone System S101A/S102A Speakerphone PEC 3163-HFU207 38. Speakerphone Adjuncts 209 S102A 210 41. Speakerphone Connections For 12-Button MET Sets 211 Char Function System Speed DialingCHAR.FUNCTION 212 Personal Speed Dialing 213 214 System 25 Starlan Network Access Access Access215 Communications Access Manager CAM Starlan Interface Circuit Pack216 Calls from System 25 to the Starlan Network Starlan Network View of SystemSystem 25 View of a Starlan Network 217 Wiring 218 219 ZTN78 220 Common Administration default Administrable ParametersIndividually Administrable default ATL Adapters Combinational Hunting Example Linear Hunting ExampleCircular Hunting Example 222 Call Coverage Station 223 224 Centralized Administration 225 226 Backspace Return SAT Connection Information227 45. Model 703 System Administration Terminal 228 229 230 TYPICAL-103A Connection Block 48. SAT On-Premises Switched Connections 231 49. SAT Off-Premises Direct Connections 232 50. SAT Off-Premises Switched Connections 233 Permanent System Alarms System MaintenanceSystem Errors And Alarms Error s Error Logs Automatic Maintenance Tests235 Trunk Number C o n d A t i o n Tandem TrunkingS c r i p t i o n 236 237 T e r a c t i o ns TestN s i d e r a t i o ns 238 Data Terminal source THIRD-PARTY Call SetupVoice Terminal source 239 Setting Up a Third-Party Call 240 AT&T Starlan Network Access Expert ModeAdministration Requirements Data Port T e r a c t i o ns Call Coverage TIE Trunks 242 243 Touch Dial Pads TOUCH-TONE and Dial Pulse ServicesTouch-Tone Dial Pads 244 T e r a c t i o n s 245 246 Data Call Preindication Data Call Origination Using Transfer to DataTransfer to Data 247 248 Trunk Groups 249 S t r i c t i o n s e e Calling Restrictions N s i d e r a t i o n sC i l i t y 250 251 TRUNK-TO-TRUNK Transfer 252 User Changeable Options User Changeable Options Definition253 51. Command Mode Menu Tree Viewing Options Changing Options-General255 Changing Data Port Speed EXit Low256 Interactions Expert Mode 257 Virtual Facilities 258 A R a C T E RF U N C T I O N Examples of Virtual Facility Numbers259 Accessing a Virtual Facility Example260 261 TDM ATLMET List of Tables Digital Switch System 25 Digital Switch Common Control Call Processor Circuit Pack ZTN82 or ZTN128 Call Processor ZTN82 or ZTN128 Circuitry Interrupt Level Memory Circuit Pack ZTN81 or ZTN127 Timing and Control Logic Circuit Switching Network TDM Bus Time Slot Generation Not a Timing Diagram Physical Characteristics Electrical Characteristics Time Slot No Function TDM Bus Diagram -Three Cabinet System Port Circuits SINGLE-LINE Voice Terminals SMD Asynchronous Data Unit CAS Call Accounting System Translated, and yellow circuit busy Port Circuit Pack Common Circuitry Ground Start Trunk ZTN76 Unique Ground Start Trunk ZTN76 Circuitry Loop Start Trunk ZTN77 Unique Loop Start Trunk ZTN77 Circuitry 10. Unique Tip Ring Line ZTN78 Circuitry Page ATL Line ZTN79 Port Circuits 11. Unique ATL Line ZTN79 Circuitry Data Line TN726 12. Unique Data Line TN726 Circuitry MET Line TN735 13. Unique MET Line TN735 Circuitry Analog Line TN742 14. Unique Analog Line TN742 CircuitryPage Did Trunk TN753 15. Unique did Trunk TN753 Circuitry Tie Trunk TN760B 16. Unique Tie Trunk TN760B Circuitry Signaling Type Summary Signaling Transmit Receive Type ON-HOOK OFF-HOOKTN760B Tie Trunk Preferred Signaling Formats Auxiliary Trunk TN763 18. Unique Auxiliary Trunk TN763 Circuitry Starlan Interface ZTN84 Network Saki Service Circuit ZTN85System Resources On-BoardPage 19. Service Circuit ZTN85 Tone Detector TN748 20. Tone Detector TN748 Circuit Capability Data Module Mode Pooled Modem TN758Page Maintenance Software Switched Services SoftwareAdministrative Software Memory Allocation Software Partitioning Memory Circuit PackCall Processor Circuit Pack Port Circuit Packs Step-By-Step Call Description 22. System Software Partitioning On the terminal ADU ListHfai SIP Madu Hardware Description System Cabinets J58901A1 System 25 Cabinets J58901A-Three Cabinet System System Cabinet J58901A-Rear View Cabinet 1 Control and Port Circuits Cabinet Address PlugCabinets 2 and 3 Port Circuits System Circuit Pack Configurations Total Port Circuit Packs Per System Optional Circuit Packs Circuit PacksRequired Circuit Packs System Resource Circuit Packs Station Port Circuit Packs Trunk Port Circuit Packs Circuit Pack Compatibility Circuit Pack Features System Circuit Packs Title Circuit Number Circuit Pack Type Ports Model 500 Series Voice TerminalsSingle-Line Voice Terminals PFT 554BMPA Summary of Voice TerminalsTerminal Circuit Pack Type Model Description Interface ZTN79 Model 2500 Series Mode1 2500 Series Analog Voice Terminals Model 7101A MD PEC 3170-00M Mode1 7101A Analog Voice Terminal Speakerphone Speakerphone Voice Terminal Feature Operations Single-Line Voice Terminal Connection Information Multiline Voice Terminals 7300H Series Voice Terminals Button Voice Terminal 7302H01D PEC Button Voice Terminal 7302 HOlD Button Voice Terminal 7303H01D PEC Button Voice Terminal 7303HO1D Button Voice Terminal 7305H01D MD PEC Button Voice Terminal 7305HO1D MD Button Deluxe Voice Terminal 7305H02D PEC For General UseFor Use as a Direct Trunk Attendant Console 10 -Button Deluxe Voice Terminal 7305H02D Hfai 11. BIS Voice Terminal 7305H03B Feature Buttons only 12 have associated LEDs For Use as a Switched Loop Attendant Console 12. BIS Voice Terminal with Display 7305H04BPage 13. Hfai Voice Terminal 7309HO1B Ten Button Multibutton Electronic Telephone MET 2991 C/D05 14. Ten Button MET Set 2991C05 Ten Button MET With Built-In Speakerphone 2993C04 15. Ten Button MET With Built-In Speakerphone 2993C04 Twelve Button MET Set 7203M 16. Twelve Button MET Set 7203M Multiline Voice Terminal Connection Information Voice Terminal Adjuncts Voice Terminal Adjunct Connection Information Voice Terminal Adjunct Power SuppliesSupplemental Voice Terminal Power Supplies Unit Output For USE with Asynchronous Data Units AD US 17. Asynchronous Data Unit ADU ADU Connection Information Unit PEC Feature Asynchronous Data UnitsZ3A1 Optional Power Equipment Uninterruptible Power Supply AC Power Line Surge Suppressor 346 Modular Bulk Power SupplyTrunk Access Equipment TAE 18. Trunk Access Equipment TAE Connections Station Interconnect Panel SIP 617A PanelAdapters 19 a Station Interconnect Panel 20. Typical SIP Connections Connectivity Figures 21. On-Premises Single-Line Voice Terminal Connections 22. Out-Of-Building Single-Line Voice Terminal Connections SINGLE-ENDED 25 Pair Cable A25D 7300H Type Voice Terminal Ground Wire 26. Ten Button MET Set Connections TYPICAL- 103A Connecting Block ZTN78 TIP Ring Line CP 103A Connecting Block 30. Typical Madu Connections 31. Z3A1/2/4 ADU Local Power Connections Technical Specifications Hardware And Software Parameters Total Hardware And Software Parameters Contd Traffic Data Simultaneous Equipment Circuit Unit Load Pack PER Port Unit LoadsUnit Loads Note ZTN79 BIS Supporting Gauge Wire Circuit Cable Distance LimitationsPack Feet Meters ZTN78 5106mm Pack Feet Meters Data Rate Gauge Wire Data Terminals RS-232 Connected To Asynchronous Data UnitsFeet Meters Tones Indicator Lamp SignalsLamp Signal Tone Frequency Station Type Circuit Pack Data Terminal Specifications Data Terminal Ports Note Data Terminals Data Requires Z3A1 TerminalZ3A4 ADU Dtmf REN Port Specifications Contd Voice Terminal Ports Contd Station Type Circuit Pack Specifications Trunk Ports Trunk Type Circuit Pack Specifications Ground Start Recommended Central Office Trunk Facilities Calling TrafficVoice Light Medium Heavy Terminals Traffic Loss Analog Transmission CharacteristicsSignal Level Distortion Level Connection Type Loss Impulse Noise Loop ResistanceConnection Bandwidth 64 Kbits Steady State Noise Level Single Frequency Return Loss Talking State Environmental Requirements Floor Plans And Layouts Typical System 25 Equipment Area Floor Plan Typical System 25 Equipment Area Elevation Plan Temperature and Humidity Wall Space Requirements Air Purity LightingElectrical Noise RFI AC Power Requirements Single Cabinet System AC Power Distribution Multiple Cabinet System Grounding Lightning Protection Parts Listed by PEC Part Apparatus Code Comcode ZTN76 Merlin VTPart of 62512 62512 62512 Z3A5 ATL ADU MOH 10B ETUZ3A4 ADU Starlan Network PEC Description Apparatus CodeCAM NEU PEC Description Apparatus Code Comcode 500BMPA Merlin BIS VT S C R I P T I O NMerlin Hfai VT Irob PEC CPU/MEM Parts Listed by Comcode Comcode PEC Description M C O DE PEC Description Apparatus Code M C O DE P E C Description Apparatus Code Merlin BIS Merlin Hfai 105341382 1020-S91 Comcode PEC Description Apparatus Code AT&T Starlan Network Basic Manuals Supplementary Material Descriptions of Basic Manuals Terminal Operations Manual Planning ManualReference Manual User Guides 700 Series Appearance AdministerAnalog Voice Terminals Asynchronous Data Transmission Bit Binary Digit Auxiliary EquipmentAuxiliary Trunk Bridge Bridging Bus, Time Division Multiplex Class of Service COSCommon Control Switching Arrangement Ccsa CCS Hundred Call Seconds Coverage Path ConsoleCoverage Call Coverage Point Data Terminal Equipment DTE Delay-Dial Tie TrunkData Module Digital Data Endpoints Facility physical FeatureFeature Button Foreign Exchange FX In-Use Lamp Home Numbering Plan Area Code HnpaImmediate-Start Tie Trunk Intercept Tone Multilane Voice Terminal Multifeature Single-Line Voice TerminalModem Pooling Multiplexed Personal Dial Code ParameterPeripheral Equipment Pickup Group Public Network Random Access Memory RAMProtocol Queue Software SwitchSwitchhook Split Time Division Multiplex Bus Wide Area Telecommunications Service WatsTie Trunk Tone Ringer Service Write Operation Index 10-1 10-2 10-3 Line Contd 10-4 Starlan Network