Variants
A number of broadcasting variants of the MAC standard exist.
- A-MAC Designed as a test-bed for the MAC concept. A-MAC was never deployed by any broadcaster. S-MAC is design descendant A-MAC.
- B-MAC used in South Africa by Multichoice, Australia by Optus and also used in parts of Asia until 2005 when digital compression finally replaced B-MAC.
- C-MAC has a wide-screen backwardly compatible variant called E-MAC.
- D-MAC (used by British Satellite Broadcasting) but not used on cable systems. This is a satellite only MAC format. Also used by NRK. This because D-MAC has 4 audio channels (D2-MAC just has 2 audio channels). Then it was possible to transmit 3 radio channels and 1 TV channel at one D-MAC channel.
- D2-MAC used until July 2006 in Scandinavia and until the mid-1990s for German and French satellite television. Some cable systems may still be using D2-MAC in Europe and Asia.
- HD-MAC, an early high-definition television standard allowing for 2048x1152 resolution.
Read more about this topic: Multiplexed Analogue Components
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