2b1q meaning

(2Binary 1Quaternary) An encoding method used in ISDN in which each pair of binary digits represents four discrete amplitude and polarity values.
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A line coding technique, with echo cancellation, used in North America for ISDN basic rate interface (BRI). 2B1Q is a form of pulse amplitude modulation (PAM) that uses four (i.e., quaternary) levels of amplitude (i.e., voltage), each of which represents two adjacent bits in a bit stream, and is accomplished by varying the voltage at nominal levels of.
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