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Preface | ||
Acknowledgements | ||
1 | Fundamental Concepts | 1 |
1.1 | Communications System Components | 2 |
1.2 | Line Connections | 2 |
1.3 | Types of Service and Transmission Devices | 5 |
1.4 | Transmission Mode | 16 |
1.5 | Transmission Techniques | 22 |
1.6 | Types of Transmission | 25 |
1.7 | Line Structure | 26 |
1.8 | Line Discipline | 28 |
1.9 | Transmission Rate | 29 |
1.10 | Transmission Codes | 31 |
1.11 | Error Detection and Correction | 41 |
1.12 | Standards Organizations, Activities and the OSI Reference Model | 51 |
1.13 | The Physical Layer: Cables, Connectors, Plugs and Jacks | 66 |
1.14 | The Data Link Layer | 101 |
1.15 | Integrated Services Digital Network | 134 |
Review Questions | 145 | |
2 | Networks and Internetworking | 149 |
2.1 | Circuit Switched Networks | 149 |
2.2 | Packet Switching Networks | 156 |
2.3 | Local Area Networks | 168 |
2.4 | Wide Area Networks | 193 |
2.5 | Network Architecture and SNA | 197 |
2.6 | Internetworking | 203 |
Review Questions | 207 | |
3 | Data Transmission Equipment | 211 |
3.1 | Acoustic Couplers | 211 |
3.2 | Modems | 215 |
3.3 | Intelligent Modems | 278 |
3.4 | Multiport Modems | 304 |
3.5 | Multipoint Modems | 310 |
3.6 | Security Modems | 316 |
3.7 | Line Drivers | 319 |
3.8 | Limited-Distance Modems | 324 |
3.9 | Digital Service Units | 328 |
3.10 | Channel Service Units | 347 |
3.11 | Parallel Interface Extenders | 357 |
3.12 | Bridges, Routers, and Gateways | 360 |
Review Questions | 371 | |
4 | Data Concentration Equipment | 377 |
4.1 | Multiplexers | 378 |
4.2 | Group-band Multiplexers | 407 |
4.3 | T1 Multiplexers | 411 |
4.4 | Inverse Multiplexers | 431 |
4.5 | Packet Assembler/Disassembler | 440 |
4.6 | Concentrators and Front-end Processors | 445 |
4.7 | Modem- and Line-sharing Units | 465 |
4.8 | Port-sharing Units | 471 |
4.9 | Control Units | 478 |
4.10 | Port Selectors | 484 |
Review Questions | 497 | |
5 | Redundancy and Reliability Aids | 503 |
5.1 | Data Communications Switches | 503 |
5.2 | Line Restoral Units | 522 |
Review Questions | 526 | |
6 | Automatic Assistance Devices | 527 |
6.1 | Automatic Answering Units | 527 |
6.2 | Automatic Calling Units | 529 |
Review Questions | 540 | |
7 | Specialized Devices | 543 |
7.1 | Security Devices | 544 |
7.2 | Protocol Converters | 560 |
7.3 | Speech Plus Data Units | 566 |
7.4 | Voice Digitizers | 568 |
7.5 | Data Compression Performing Devices | 576 |
7.6 | Fiber Optic Transmission Systems | 587 |
Review Questions | 599 | |
8 | Integrating Networking Devices | 601 |
8.1 | Inverse Multiplexing with Multiport Modems | 601 |
8.2 | Network Integration Problems | 609 |
Appendix A. Sizing Data Communications Network Components | 613 | |
A.1 Device Sizing | 613 | |
A.2 The Erlang Traffic Formula | 622 | |
A.3 The Poisson Formula | 626 | |
A.4 Applying the Equipment Sizing Process | 630 | |
Appendix B. Erlang Distribution Program | 635 | |
Appendix C. Poisson Distribution Program | 637 | |
Appendix D. Multidrop Line Routing Analysis | 639 | |
Index | 645 |
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