2B1Q

Two-binary, one-quaternary (2B1Q) is a physical layer encoding used for Integrated Services Digital Network (ISDN) basic rate interface. 2B1Q uses four signal levels (1Q), equivalent to two bits (2B). Other encoding techniques are B8ZS, AMI or HDB3.

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.
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