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Digital Tape Unit (DTU)
Digital Tape Unit (DTU)
The Digital Tape Unit (Figure 2-23) is a RS-232 device used to record administration
translations. The DTU does not encode the translations data as it records, nor does it
require decoding circuitry when playing back (restoring) recorded data. Data is recorded and
transmitted at 1200 bps.
The DTU requires 115V commercial power from a 3-wire grounded outlet. It should be
located on a desk or table top. The recorder is approximately 5 inches wide, 2 inches high,
and 10 inches long.
As shown in Figure 2-24, the DTU must be directly connected to port #3 on the Call
Processor (ZTN82 or ZTN128) CP. Remote and switched connections are not supported.
Maximum cabling distances are provided in Section 5, “Technical Specifications.”
115V AC
POWER
CABLE
EIA
RS-232C
CONNECTOR
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3-WAY POWER
DIGITAL RESET
COUNTER
(TOP VIEW)
Figure 2-23.
Digital Tape Unit
2-145
- 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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