<communications> (2B1Q) A physical layer encoding used for Integrated
Services Digital Network basic rate interface. 2B1Q represents two bits (2B - a
"dibit") using one of four signal levels (1Q - a "quadratude"). The first bit of
the dibit is indicated by polarity: positive indicates a binary 1 and negative
indicates a 0. The second half of the dibit is indicated by voltage magnitude: 1
Volt indicates a binary 1 and 3 Volts indicates binary 0.
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