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.
References in periodicals archive ?
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.
Telmax's central office and customer premises solutions utilize CAP, DMT and echo-canceled 2B1Q modulation techniques to support HDSL-2, ADSL, G-LITE, VDSL, MSDSL, SDSL, IDSL, ISDN and POTS services.
In another ISDN development, AT&T announced a single-chip 2B1Q transceiver that connects ISDN users to public network facilities.
The Speedlink System is a multi-service platform that supports ADSL and 2B1Q (SDSL and IDSL) services in the same line card shelf.
As presently adopted by ANSI, 2B1Q is the transmission line code for the basic-rate interface (BRI).
GlobeSpan offers a broad suite of DSL solutions, including ADSL, HDSL, HDSL2, SHDSL and SDSL chip sets based on DMT, 2B1Q, PAM and CAP line codes.
The chip set is a variable-rate transceiver which provides symmetric full-duplex communication on one twisted wire pair using a 2B1Q line code with echo-cancellation.
CAP HDSL features a more efficient signal spectrum than offered by competing technologies, allowing the CAP signal to achieve a higher level of performance using about half the signal bandwidth of currently available 2B1Q (2 Binary 1 Quaternary) systems.
Utilizing Brooktree(R)'s 2B1Q modulation technology, Westell's InterAccess HDSL unit can transport a full duplex E1 transmission signal up to 3.
The Tellabs CROSSNET 240 NTU is a high-performance digital transmission system that uses 2B1Q line coding to transmit full-duplex data over a single twisted-wire pair.
SHDSL provides roughly 25 percent more loop reach than currently deployed 2B1Q based SDSL technology and offers excellent spectral compatibility with other DSL services like ADSL.
The CROSSNET(R) 240 network terminating unit (NTU) is a digital transmission system that uses 2B1Q line coding to transmit full-duplex high-speed (up to 128 kbps) data over a single non-loaded pair of wires.