Appendix 2. Abbreviations and acronyms
| ABM | Adaptive bandwidth management |
| ABSOC | Advanced Broadcasting Systems of Canada |
| ACK | Acknowledge |
| ADC, A/D | Analogue to digital conversion/convertor |
| ADM | Adaptive delta modulation |
| ADPCM | Adaptive differential pulse code modulation |
| AFTN | Aeronautical fixed telecommunications network |
| AM | Amplitude modulation |
| AMI | Alternate mark inversion |
| AM-VSB | Amplitude modulation-vestigial sideband |
| ANSI | American National Standards Institute |
| APD | Avalanche photodiode |
| ARINC | Aeronautical Radio INCorporated |
| ARPA | Advanced Research Projects Agency |
| ARQ | Automatic repeat request |
| ASCII | American Standard Code for Information Interchange |
| ASIC | Application specific integrated circuit |
| ASID | Application specific ... |
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