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PART A　The Slow Push for Progress 1

UNIT 1

UNIT 2

UNIT 3

UNIT 4

UNIT 5

UNIT 6

UNIT 7

UNIT 8

UNIT 9

UNIT 10

UNIT 11

UNIT 12

PART B　1．Subscriber and Exchange Relationships 12

2．Toll Switching 16

PART C Electronic Switching in the U.S 19

参考译文 21

PART A Basic Switching and Traffic Concepts 25

PART B 1．Concentration and Expansion 36

2．Use of the Multiple 39

PART C Concentration and Expansion Stages 43

参考译文 47

Signalling Methods 53

PART A Common Stored-program Control and 53

PART B 1．Processing 65

2．Types of Control 66

PART C Control and Signal Methods 70

参考译文 72

PART A PCM Switching Principles 78

PART B PCM Toll Exchange 90

PART C Local Digital Exchange 97

参考译文 99

PART A The Control of SPC Exchanges 105

PART B Call Processing Programs 117

PART C The Establishment of a Local Call 122

参考译文 127

PART A The Elements of Stored-program Control 134

PART B The Stored Program 146

PART C 1．Program Coding and Assembly 153

2．Program Testing and Evaluation 154

参考译文 156

PART A Automatic Private Branch Exchanges 162

PART B 1．Centralized Extension Service 171

2．DOD and DID 172

PART C Typical PABX Systems 177

参考译文 180

PART A Data Communications 184

PART B Packet-switching Networks 194

PART C Telex Switching Systems 200

参考译文 203

PART A Common-channel Signalling 208

PART B CCS Networks 220

PART C Application of Common-channel 226

Signalling 226

参考译文 230

PART A ISDN Introduction 237

PART B ISDN Applications 254

PART C ISDN Standardization 261

参考译文 267

PART A FETEX-150 Digital Switching Syst？m 275

PART B FETEX-150 Recent Change 288

PART C New Development of FETEX-150 293

参考译文 297

PART A SYSTEM 12—Digital Exchange 304

PART B Features of SYSTEM 12 329

PART C 1．System Specification 341

2．Reliability and Maintainability 342

3．Further Developments and Future 345

参考译文 347

词汇表 364

词组表 420

练习答案 433