Acronym for 2 Binary 1 Quaternary.

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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