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2B1Q2 Binary 1 Quaternary
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Systems designed to comply with the ANSI specification for 2B1Q can be expected to operate satisfactorily on 98% of all non-loaded subscriber loops in the North American two-wire loop plant.
Also, 2B1Q loops should not contain faults that would violate normal voice grade POTS standards.
The service performance objectives of the 2B1Q system were chosen to allow the local telephone company service provider to assign the ISDN loop facility from a normal POTS database.
The AT&T 2B1Q transceiver performance is not sensitive to the details of cable makeup.
In spite of the international convergence on 2B1Q as the accepted line code, differences in the NT1 design exist with respect to the country in which it will be used.
In order for the network provider to be able to identify and maintain the 2B1Q loop, the NT1 must provide a unique signature.
2B+D bits can be transmitted over a pair of wires by many line codes, such as 2B1Q, AMI, TCM, or 4B3T.
2B1Q stands for "two bits in one quaternary"--meaning two bits transmitted in one four-level symbol.
Today's ANSI standard specifies that the 144 kb/s payload of 2B1Q be formatted into 2B+D.
When told a certain piece of equipment handles 2B+D, remember to ask: "But does it use the 2B1Q line code?"
The basic technology that implements 2B1Q is modern algorithms for digital signal processing (DSP).
Are implementations of 2B1Q technology available today?