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FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
This section describes how the digital switch and the software of System 25 provide control and
switching.
Digital Switch
Figure 3-1 shows a block diagram of the System 25 digital switch. The basic switch hardware
consists of the following:
● Common Control
● Switching Network
—
—
—
COMMON
CONTROL
SWITCHING
NETWORK
Time Division Multiplex (TDM) Bus
Port Circuits
System Resource Circuits
CPU/MEM
TDM BUS
PORT
CIRCUITS
SERVICE
CIRCUIT
TONE
DETECTOR
POOLED
MODEM
TRUNKS, VOICE,
AND DATA TERMINALS
Figure 3-1.
SYSTEM RESOURCES
System 25 Digital Switch
November 1995
3-1
- AT&T System 25 1
- MEANS OF CONNECTION 3
- REPAIR INSTRUCTIONS 4
- HEARING AID COMPATIBILITY 4
- FCC INFORMATION 4
- FCC WARNING STATEMENT 5
- CONTENTS 7
- OVERVIEW 10
- Figure 1-1 11
- System 25 Block Diagram 11
- ● Voice Terminals — 12
- ● Data Facilities 12
- Call Handling Capabilities 13
- Business Communications Needs 14
- Internal Call Movement 18
- Data Communications 19
- Growth & Rearrangement 22
- Conclusions 23
- Symbols Used in Illustrations 33
- Feature Tables 33
- System Features 34
- Station Features 35
- Network Features 36
- Data Features 37
- Attendant Features 38
- Account Code Entry, Forced 39
- Account Code Entry 42
- Optional 42
- Attendant Call Extending 45
- Attendant Camp-On 47
- Attendant Cancel 49
- Figure 2-2 54
- Figure 2-6 66
- Figure 2-7 69
- Attendant Join (SLAC Only) 71
- Attendant Message Waiting 72
- Attendant Position Busy 74
- Attendant Release 77
- Coverage: 82
- Automatic Intercom 86
- ● ARS FRL Level (0-3) 94
- Figure 2-8 95
- Figure 2-9 97
- Considerations 100
- Interactions 100
- Administration Requirements 104
- Busy-To-Idle Reminder 105
- Call Accountability 106
- Call Accounting System (CAS) 107
- Hardware Requirements 109
- ● No flow control 110
- Callback Queuing 112
- ● On-Hook Queuing 113
- ● Callback 113
- ● Callback Cancellation 114
- Calling Restrictions 119
- Call Management System (CMS) 123
- Call Progress Tones 126
- Call Waiting 127
- Command Mode 129
- CURRENT column. Refer to the 130
- ● Personal Directory area 134
- ● Message and Status area 134
- ● Command Line area— 134
- Conference 135
- Conference Drop 138
- Coverage, Group 140
- Coverage, Individual 146
- DS1 Facility Interface 149
- DS1 Interface Circuit Pack 154
- < > 157
- FEATURES AND SERVICES 158
- Figure 2-18 158
- Data Call Setup 160
- Data Services Overview 161
- Data Terminal Dialing 167
- ● DIAL: 3478 168
- Description 171
- Dial Plan 172
- Data Dial Codes (DDCs) 174
- Dictation System Access 175
- Digital Tape Unit (DTU) 177
- Direct Group Calling (DGC) 179
- Direct Inward Dialing (DID) 184
- Directory 187
- 208 OUTSIDE 196
- ● Account Code Entry 197
- ● Busy-To-Idle Reminder 198
- ● Callback Queuing 198
- ● Calls to the Attendant 198
- ● Conference/Bridging 198
- ● DGC Queue Field 198
- ● Send All Calls 200
- ● Transfer 200
- Distinctive Ringing 203
- End-To-End Signaling 204
- Exclusion 205
- Expert Mode 207
- Extended Stations 210
- External Alerts 211
- Figure 2-27 213
- Following 214
- ● The general case— 215
- Forwarding 217
- Headset Adapter Adjunct 226
- ● Figure 2-30— 227
- ● Figure 2-31 227
- Figure 2-30 228
- Requiring Auxiliary Power 228
- Figure 2-31 229
- Figure 2-32 230
- Inspection 233
- Integrated Solution (IS) 236
- Interdigit Timeouts 240
- Last Number Dialed 241
- Leave Word Calling 244
- Line Selection 247
- Local Display 252
- Manual Signaling 255
- Messaging 259
- Services 259
- Modem Pooling 262
- Music-On-Hold 265
- Figure 2-33 267
- Night Service 269
- Off-Premises Stations (OPS) 274
- Out-of-Building Stations 275
- Paging System Access 276
- Personal Dial Code (PDC) 284
- Personal Lines 286
- Pooled Facility - Dial Access 290
- Power Failure Transfer (PFT) 294
- Figure 2-38 296
- Figure 2-39 297
- Figure 2-40 298
- Multiple ETU Arrangements 298
- Remote Access 305
- Security Considerations 306
- Features and Services 310
- November 1995 310
- Security Consideration 312
- Repertory Dialing 315
- Send All Calls 317
- Speakerphone Adjunct 321
- Figure 2-41 323
- Speakerphone Adjuncts 323
- (Except 34-Button Sets) 324
- Figure 2-44 326
- Speed Dialing 327
- STARLAN NETWORK Access 330
- Figure 2-46 336
- Telephone) 336
- Figure 2-47 337
- Station Hunting 338
- AC Outlet) 348
- Figure 2-53. SMDR Output 350
- System Administration 354
- ● Figure 2-57 357
- Figure 2-56 358
- Figure 2-59 361
- Figure 2-61 363
- SAT Off-Premises 363
- Switched Connections 363
- System Maintenance 364
- ● Most Recent System Errors: 365
- ● Periodic 365
- ● Demand 365
- Tandem Trunking 366
- Third-Party Call Setup 369
- Tie Trunks 373
- Transfer 377
- Transfer To Data 380
- Trunk Groups 382
- Trunk-To-Trunk Transfer 385
- User Changeable Options 386
- Virtual Facilities 392
- ● Example 2: 393
- ● Example 3: 394
- AUDIX Voice Power System 397
- FUNCTIONAL DESCRIPTION 399
- Common Control 403
- ● Clock 405
- ● Interrupt Circuitry 405
- ● Reset Circuitry 405
- ● Bus Error Circuitry 405
- ● Bus Terminators 406
- Switching Network 407
- Figure 3-4 409
- ● Bus Buffers 410
- ● Circuit Pack Address Leads 415
- ● Ringing Application Circuit 415
- ● Port I/O Circuit 415
- ● Port Circuits 416
- ● Protocol Handler 417
- Figure 3-8 418
- ● Ground Detector Circuit 419
- ON-BOARD 420
- MICROPROCESSOR 420
- AUXILIARY 420
- EQUIPMENT 420
- Figure 3-10 421
- PORT: 4 3 2 1 429
- ● Eight Port Circuits 432
- ● Clock Circuit 434
- ● Tone Generator 434
- ● Time Slot Table and Counter 434
- ● Tone Detector Ports 434
- ● Modem emulation (see below) 436
- ● Common Circuitry 437
- ● Conversion Resources 437
- Software 439
- Memory Allocation 440
- Real-Time Constraints 440
- Software Partitioning 440
- Figure 3-21 441
- System Software Partitioning 441
- ● Administration 442
- ● Feature Code Modules 442
- ● Error Logger 442
- Step-By-Step Call Description 443
- HARDWARE DESCRIPTION 446
- Cabinet Address Plug 456
- Circuit Packs 457
- Required Circuit Packs 458
- Optional Circuit Packs 459
- ● ZTN84 STARLAN Interface 460
- ● TN758 Pooled Modem 462
- Circuit Pack Compatibility 463
- Circuit Pack Features 463
- Terminal Equipment 464
- Table 4-E 468
- ● Handset 470
- ● Touch-Tone Dial 470
- ● Message Indicator 470
- ● Two Fixed Feature Buttons 470
- Figure 4-8 475
- Figure 4-9 477
- Figure 4-10 479
- ● 502B Headset Adapters 481
- I-USE/STATUS LEDs 483
- PROGRAMMABLE 483
- BUTTONS (34) 483
- Message* 484
- CONTROLS 485
- Figure 4-15 489
- Figure 4-16 491
- Figure 4-20 499
- Figure 4-21. 12-Button 501
- MET Set (7203M) 501
- Voice Terminal Adjuncts 505
- Attendant Consoles 506
- Table 4-G 509
- Asynchronous Data Units 509
- Peripheral Equipment 510
- Auxiliary Equipment 510
- Optional Power Equipment 511
- Connectivity 512
- Figure 4-24 513
- Adapters 514
- Figure 4-25. 617A Panel 515
- Connectivity Figures 517
- ADU Connections 518
- Figure 4-28 519
- Figure 4-29 520
- Figure 4-30 521
- Telephone Connections 521
- Figure 4-31 522
- Figure 4-32 523
- MET Set Connections 523
- Figure 4-36 527
- Typical MADU Connections 527
- Figure 4-37 528
- TECHNICAL SPECIFICATIONS 529
- Unit Loads 536
- Cable Distance Limitations 537
- Multiline Voice Terminals 538
- Indicator Lamp Signals 541
- Port Specifications 542
- Port Specifications (Contd) 543
- ENVIRONMENTAL REQUIREMENTS 553
- Figure 6-1 556
- Figure 6-2 557
- Table Top Space 558
- Wall Space Requirements 558
- Temperature and Humidity 558
- Air Purity 559
- Lighting 559
- ● Electromagnetic sources 560
- AC Power Requirements 562
- Grounding 564
- Lightning Protection 564
- PARTS INFORMATION 566
- Parts Listed by COMCODE 575
- REFERENCE DOCUMENTATION 582
- Integrated 584
- Solution Documents 584
- Descriptions of Basic Manuals 584
- GLOSSARY 586
- ● CO Trunks 592
- ● FX Trunks 592
- ● WATS Trunks 592
- ● Tie Trunks 592
- ● Floating PDCs (FPDCs) 597
- ● Facility port (trunk port) 597
- ● Auxiliary equipment port 597
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