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Reference.org
B-MAC
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<p>B-MAC is a form of analog video encoding, specifically a type of <a href="/facts/Multiplexed_Analogue_Components/j700uM55">Multiplexed Analogue Components</a> (MAC) encoding. MAC encoding was designed in the mid 80s for use with <a href="/facts/Direct_Broadcast_Satellite/UxytxnPW">Direct Broadcast Satellite</a> systems. Other analog video encoding systems include <a href="/facts/NTSC/HYWIvxCR">NTSC</a>, <a href="/facts/PAL/t8TugcxK">PAL</a> and <a href="/facts/SECAM/vexpud7W">SECAM</a>. Unlike the <a href="/facts/Frequency-division_multiplexing/lgj6TMU1">Frequency-Division Multiplexing (FDM)</a> method used in those, MAC encoding uses a <a href="/facts/Time-division_multiplexing/tv7bMh1v">Time-Division Multiplexing (TDM)</a> method. </p><p>B-MAC was a proprietary MAC encoding used by <a href="/facts/Scientific_Atlanta/IBARBkP0">Scientific-Atlanta</a> for encrypting broadcast video services; the full name was "Multiple Analogue Component, Type B". </p>