| Abbreviation | Definition |
|---|---|
| AMP | Accelerated Mobile Pages |
| amp | amplifier / amplification |
| AMPS | Advanced Mobile Phone Service |
| AMPU | Average Margin Per User |
| AMR | Automatic Meter Reading |
| AMS | Analog and Mixed Signal |
| AMSI | Ameritech Message Signal Interface |
| AMSS | Automatic Message Switching System |
| AMT | Australasian Mobile Telecommunications |
| AMTS | Automated Maritime Telecommunications System |
| AN | Access Node |
| AN | Accessory Number |
| ANAC | Automatic Number Announcement Circuit |
| ANC | Access Network Controller |
| ANCD | Automatic Network Call Distrubution |
| ANP | Autonomous Network Planning |
| ANSI | Advanced Network Signaling Input |
| ANSI | American National Standards Institute |
| AOC | ADSL (Asynchronous Digital Subscriber LIne) Overhead Control channel |
| AON | All-Optical Network |