| Access Control System | The complete system for ensuring that broadcasting services are only accessible to those who are entitled to receive them. The system usually consists of three main parts - signal Scrambling , the encryption of electronic "keys" needed by the viewer, and subscriber management system which ensures that viewers entitled to watch the scrambled programmes are able to do so.
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| Analogue | A method of storing, processing or transmitting information through a continuous varied signal.
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| Antenna | See "satellite dish".
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| Asymmetric transmission | Transmission where the required bitrate for the forward path and the return path is different (e.g. high forward path and low return path data rate).
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| Azimut | Angle between true north and a particular satellite. Can be measured with a compass.
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