Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Two-binary, one-quaternary (2B1Q) is a physical layer encoding used for Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) implementations. 2B1Q uses four signal levels, which are –450 mV, –150 mV, 150 mV and 450 mV, each (1Q) equivalent to two bits (2B). A competing encoding technique, also used for ISDN basic rate interfaces, is 4B3T. If the voltage is misread as an adjacent level, this will only cause a 1-bit error in the decoded data. 2B1Q is also used for some variants of HDSL. 2B1Q code is not DC-balanced.

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