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[Acronym] for 2 __B__inary 1 __Q__uaternary. [2B1Q] is a full duplex physical layer encoding method, used in [ISDN], [HDSL] and [SDSL]. Two binary bits are encoded into one quaternary signal, which doubles the effectiveness of transmission. |Bits|Quaternary Symbol|Voltage Level |00|-3|-2.5 |01|-1|-0.833 |10|+3|+2.5 |11|+1|+0.833 See also: [Binary], [Ternary], [Quaternary].
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2B1Q
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