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1IntroductiontoDataandNetworkCommunications 1

1.1Introduction 1

1.2DataCommunicationSystem 6

1.3DataCommunicationLinks 10

1.4CharacterCodes 12

1.5DigitalDataRates 16

1.6SerialDataFormats 17

1.7EncodedDataFormats 20

Summary 24

Questions 25

DesignProblems 26

AnswerstoReviewQuestions 27

2TheTelephoneSystem 29

2.1Introduction 29

2.2TheTelephoneSystem 30

2.3SpecificationsandParameters 38

2.4LineImpairments 52

Summary 56

Questions 57

DesignProblems 58

AnswerstoReviewQuestions 59

3ErrorDetectionandCorrection 61

3.1Introduction 61

3.2AsynchronousDataMethods 62

3.3SynchronousDataErrorMethods 72

3.4Error-TestingEquipment 83

Summary 85

Questions 86

AnswerstoReviewQuestions 87

DesignProblems 87

4OpenSystemsNetworkModels 89

4.1Introduction 89

4.2DataTopologies 90

4.3DataSwitching 101

4.4TypesofNetworks 105

4.5TheOpenSystemsInteconnection(OSI)Architecture 108

4.6SystemsNetworkArchitecture(SNA) 114

4.7SNAOperatingSessions 121

Summary 122

Questions 123

DesignProblems 125

AnswerstoReviewQuestions 125

5OSIPhysicalLayerComponents 127

5.1Introduction 127

5.2UnitsofaCommunicationLink 128

5.3RS232CInterface 137

5.4RS449InterfaceStandard 145

5.5RS422andRS423InterfaceStandards 147

5.6FSKModems 150

5.7AdditionalTypesofModems 153

5.8.34andV.90Modems 170

Summary 171

Questions 173

ResearchAssignments 175

AnswerstoReviewQuestions 175

6HigherCapacityData 179

Communications 179

6.1Introduction 179

6.2MultiplexingMethods 181

6.3SamplingTheorem 190

6.4Quantization 197

6.5PulseCodeModulation 198

6.6DeltaModulation 202

6.7DigitalTCarriers 206

6.8Companding 213

6.9CODECs 217

Summary 221

Questions 221

DesignProblems 223

AnswerstoReviewQuestions 224

7Data-LinkLayerProtocols 227

7.1Introduction 227

7.2Data-LinkSections 228

7.3Character-OrientedProtocols 230

7.4Bit-OrientedProtocols 238

7.5ProtocolAnalyzers 249

Summary 251

Questions 252

AnswerstoReviewQuestions 254

8NetworkArchitectureandProtocols 257

8.1Introduction 257

8.2NetworksbySize 259

8.3IEEE802.3andEthernet 261

8.4IEEE802.4TokenBus 274

8.5IEEE802.5TokenRing 279

8.6NetworkInterfaceCards 283

8.7InterconnectingLANs 285

8.8IEEE802.6MetropolitanAreaNetwork(MAN) 291

8.9X.25PacketSwitchProtocol 293

Summary 296

Questions 296

ResearchAssignments 298

AnswerstoReviewQuestions 299

9IntegratedServicesandRoutingProtocols 301

9.1Introduction 301

9.2IntegratingServices 302

9.3BroadbandISDN 311

9.4IEEE802.9:IntegratedVoiceandDataServices 314

9.5DigitalSubscriberLine(DSL) 315

9.6PrivateBranchExchange 318

9.7AsynchronousTransferMode(ATM) 324

9.8FrameRelay 337

Summary 339

Questions 340

ResearchAssignments 343

AnswerstoReviewQuestions 343

10TheInternetandTCP/IP 347

10.1Introduction 347

10.2InternetHistory 348

10.3UsesfortheInternet 353

10.4AccessingtheInternet 358

10.5InternetAddresses 361

10.6SecurityontheInternet 365

10.7Authentication 367

10.8Firewalls 371

10.9IntranetsandExtranets 374

10.10TCP/IP,theTechnologybehindtheInternet 375

Questions 381

Summary 381

ResearchAssignments 384

AnswerstoReviewQuestions 384

11FiberOpticCommunications 387

11.1Introduction 387

11.2BasicConceptsofLightPropagation 389

11.3FiberCables 394

11.4LightSources 400

11.5OpticalDetectors 402

11.6Fiber-CableLosses 406

11.7WaveDivisionMultiplexing 409

11.8FiberDistributedDataInterface 411

11.9FDDI-II:IsochronousTraffic 418

11.10TheFibreChannel 419

11.11SONET 421

Summary 423

Questions 424

ResearchAssignments 427

AnswerstoReviewQuestions 427

12.1Introduction 431

12WirelessCommunicationSystems 431

12.2MicrowaveCommunications 432

12.3CellularMobileTelephoneService 434

12.4PersonalCommunicationsSystems 437

12.5IEEE802.11:WirelessLANsUsingCSMA/CA 439

12.6CellularDigitalPacketNetwork 442

12.7SatelliteCommunications 443

12.8MethodsofSatelliteCommunications 452

12.9SatelliteNetworking 457

Questions 461

Summary 461

ResearchAssignments 464

AnswerstoReviewQuestions 464

AppendixA—AcronymsandKeyTerms 467

AppendixB—CompleteExtendedASCIICodeSet 479

AppendixC—NetworkTimeline 483

AppendixD—Facsimile 497

AppendixE—AnswerKeytoOdd-NumberedQuestions 501

Index 517