2B1Q


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2B1Q

2B1Q

(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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Other features include high immunity to background noise, enabling transmission of multiple HDSL lines via the same physical cable, and the use of equalisation, adaptive filtering, echo cancellation and 2B1Q line coding to compensate for line impairments and mixed cabling.
High-data-rate DSL (HDSL) also uses 2B1Q modulation to provide a symmetric service of 1.
With the success of the 2B1Q transmission code and the other milestones that ISDN has passed, albeit slowly, this implementation should bring enough standardization to CPE that it will result in quantity production and consequently lower prices.
The early market entry by AT&T Microelectronics with full production of a 2B1Q transceiver, coupled with requests for products from the operating companies, form the catalyst for the initial deployment of both 2B1Q CO line cards and NT1s.
The NT1 is used in the basic rate interface portion of the ISDN network to connect four-wire S/T interface ISDN terminals to the two-wire 2B1Q U interface network.
In another ISDN development, AT&T announced a single-chip 2B1Q transceiver that connects ISDN users to public network facilities.
As presently adopted by ANSI, 2B1Q is the transmission line code for the basic-rate interface (BRI).