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