AT&T DEFINITY 7200 series Guia do Utilizador Página 233
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SYNCHRONIZATION OF DIGITAL FACILITIES B-25
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SECONDARY (BACKUP) FREQUENCY REFERENCE
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PRIMARY FREQUENCY REFERENCE
DIGITAL TRANSMISSION FACILITY
D
Figure B-17. Excessive Cascading
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SECONDARY (BACKUP) FREQUENCY REFERENCE
. . . . . . . . . . . . . .
PRIMARY FREQUENCY REFERENCE
DIGITAL TRANSMISSION FACILITY
D
Figure B-18. Minimized Cascading
- Network and Data Connectivity 1
- CONTENTS 10
- CONTENTS xi 11
- ACCUNET Packet Service 8-22 12
- CONTENTS xiii 13
- CONTENTS xv 15
- ABOUT THIS DOCUMENT xix 19
- ABOUT THIS DOCUMENT 20
- INTRODUCTION TO CONNECTIVITY 22
- TRANSMISSION TYPES 23
- ANALOG TRANSMISSION 23
- DIGITAL TRANSMISSION 23
- 1-4 TRANSMISSION TYPES 24
- ANALOG VS. DIGITAL 25
- TRANSMISSION STATES 27
- VOICE TRANSMISSION 27
- Entering the Switch 27
- 1-8 TRANSMISSION STATES 28
- Exiting the Switch 29
- DIMENSION S75/G1 S85/G2 30
- DATA TRANSMISSION 31
- Protocol Layers 31
- 1-12 TRANSMISSION STATES 32
- Protocols Used 33
- Protocol States 34
- Connectivity Rules 35
- MULTIPLEXED COMMUNICATION 37
- TYPES OF MULTIPLEXING 37
- Time-Division Multiplexing 37
- Statistical Multiplexing 38
- Line Coding 39
- Signal Inversion 41
- (Continued) 42
- Signaling 45
- Multiplexing onto T1 Trunks 49
- • 4-wire E&M trunks 51
- • DDS data-port adaptors 51
- • OCU data ports 51
- Multiplexing with Microwave 52
- Demultiplexing 52
- STATISTICAL MULTIPLEXING 54
- TRUNKING 55
- APPLICATION 55
- Local Exchange Trunks 55
- Tie Trunks 56
- Special-Access Trunks 57
- Auxiliary Trunks 57
- Miscellaneous Trunks 57
- CONNECTIVITY 58
- ADMINISTRATION OPTIONS 59
- System 85/G2 Administration 59
- • Line coding (ZCS or B8ZS) 61
- • Framing (D4 or ESF) 61
- • Mode 1 — 56 kbps channel 62
- TRUNKING 1-43 63
- 1-44 TRUNKING 64
- TRUNKING 1-45 65
- 1-46 TRUNKING 66
- TRUNKING 1-47 67
- 1-48 TRUNKING 68
- TRUNKING 1-49 69
- 1-50 TRUNKING 70
- TRUNKING 1-51 71
- 1-52 TRUNKING 72
- • Extension 84
- DIMENSION • • • • • • 90
- 3. TANDEM TIE TRUNK NETWORKS 93
- 3-2 TANDEM TIE TRUNK NETWORKS 94
- DIMENSIONs 101
- DIMENSION, System 85 105
- DIMENSION 120
- DIMENSION 12 120
- DIMENSION DCS 120
- DIMENSION, System 85, and 121
- DIMENSION, System 121
- DIMENSION 4 20 121
- DEFINITY Communications 123
- DIMENSION Signaling Links 132
- FEATURE FP8 R1 R2 R1 G1 G2 135
- DIMENSION PBX 136
- DIMENSION and 140
- DIMENSION PBX and 142
- __________________ 150
- DTE CONNECTIONS 157
- DTE COMPATIBILITY 157
- Protocol Converters 157
- Terminal Emulators 158
- PC/PBX or PC/ISDN 158
- DCE POSSIBILITIES 159
- Data Modules 159
- DATA MODULE CHARACTERISTICS 160
- DTE CONNECTIONS 8-7 161
- DTE CONNECTIONS 8-9 163
- MODEM POOLING CONNECTIONS 164
- 8-12 DTE CONNECTIONS 166
- LAN TOPOLOGY 167
- LAN PROTOCOL 167
- LAN TRANSMISSION MEDIA 168
- LAN CONNECTORS 168
- • Electronic messaging 175
- • Electronic order exchange 175
- • File transfers 175
- ACCUNET Packet Service 176
- MPDM/M1* 177
- PRIVATE DATA NETWORKS 180
- THE ISDN GATEWAY 185
- DATA NETWORK ADMINISTRATION 189
- A. RELATED DOCUMENTS 199
- RELATED DOCUMENTS 200
- RELATED DOCUMENTS A-3 201
- RELATED DOCUMENTS A-5 203
- RELATED DOCUMENTS A-7 205
- RELATED DOCUMENTS A-9 207
- A-10 RELATED DOCUMENTS 208
- DEFINITY 217
- • Type I Interface 246
- DIMENSION PBX switches 250
- DIMENSION PBX with LC08 256
- MEGACOM Service 260
- * DTS = Dial Tone Start 263
- COMMUNICATIONS PROTOCOLS 274
- D-4 COMMUNICATIONS PROTOCOLS 276
- COMMUNICATIONS PROTOCOLS D-5 277
- D-6 COMMUNICATIONS PROTOCOLS 278
- COMMUNICATIONS PROTOCOLS D-7 279
- • Basic rate interface (BRI) 282
- COMMUNICATIONS PROTOCOLS D-11 283
- COMMUNICATIONS PROTOCOLS D-15 287
- VARIABLE LENGTH 287
- • RLR — remote loop request 288
- PARAMETER DCP ISDN-BRI 289
- COMMUNICATIONS PROTOCOLS D-19 291
- E. LEAD DEFINITIONS 293
- CIRCUIT CIRCUIT 294
- LEAD DEFINITIONS 296
- CIRCUIT OUTPUT 297
- CIRCUIT CIRCUIT OUTPUT 298
- NO. PLUS 299
- 7404D MPDM MTDM (NOTE 1) 299
- ABBREVIATIONS 307
- DATAPHONE digital service 308
- DIMENSION) 309
- ACCUNET Service 311
- AB-6 ABBREVIATIONS 312
- GLOSSARY 313
- GLOSSARY GL-3 315
- GLOSSARY GL-5 317
- GLOSSARY GL-7 319
- GLOSSARY GL-9 321
- GLOSSARY GL-11 323
- GLOSSARY GL-13 325
- GLOSSARY GL-15 327
- GLOSSARY GL-17 329
- GLOSSARY GL-19 331
- GLOSSARY GL-21 333
- GLOSSARY GL-23 335
- INDEX IN-3 339
- INDEX IN-5 341
- DIMENSION 2-6 342
- INDEX IN-7 343
- MEGACOM 1-37 344
- MEGACOM 800 1-37 344
- INDEX IN-9 345
- ACCUNET 1-37 347
- IN-12 INDEX 348
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