| Prologue: Communications and Information | 9 |
| PART I. Analog Telecommunications | |
| Waves, Electricity, and Information | 19 |
| Communicating by Wire | 37 |
| Voices on the Wire | 49 |
| Communication through Space | 58 |
| Pictures through Space | 79 |
| PART II. Digital Telecommunications | |
| Digital Information | 95 |
| Fun with Binary Digits | 111 |
| Digital Communications: Now and Then | 121 |
| Glossary | 131 |
| For Further Reading | 139 |
| Index | 141 |