High-bit-rate digital subscriber line

About: High-bit-rate digital subscriber line is a research topic. Over the lifetime, 516 publications have been published within this topic receiving 8537 citations. The topic is also known as: HDSL & high-bit-rate DSL.

A tutorial on digital subscriber line transceiver for ISDN

Abstract: An integral part of ISDN (integrated-services digital network) is the provision of full-duplex digital transmission capability at the basic access information rate of 144 kb/s over voice-grade metallic subscriber lines with all the associated disturbances from echo, intersymbol interference, and crosstalk, among other things. The authors provide an overview of the transmission environment and discuss the structure of transceivers for such use. Line coding, equalization, echo cancellation, and timing recovery are discussed at some length. A few numerical examples are given to illustrate the theoretically optimal transmission performance that can be attained with minimum mean-squared error equalization. Considerations regarding VLSI implementation of transceivers are briefly addressed. >

Wide-band analog front-end for DSL applications

Abstract: An analog front-end circuit and method that supports multiple digital subscriber line (DSL) standards, including asymmetric digital subscriber line (ADSL) and very-high speed digital subscriber line (VDSL) is disclosed. The circuit incorporates multiple circuit blocks that can be selectively included into the transmit and receive paths of a DSL signal. It also permits selectable gain settings for signal amplifiers, and frequency bandwidth for signal filters that may be included in the transmit and receive paths. The receive path includes an analog-to-digital converter (ADC) that operates close to and exceeds the Nyquist sampling rate.

Digital subscriber line driver

Abstract: A digital subscriber line (DSL) driver allows a transmitter to monitor its own transmit spectrum at the subscriber loop and adjust the transmit spectrum based on detected line conditions, affected by the presence of bridged taps or any other impedance variations. The transmit spectrum is preferably equalized so that all carriers, or tones, transmit using the same power and exhibit the same margin. The invention is applicable to DMT and single carrier modulation formats.

Universal ISDN subscriber line connection group

Abstract: A universal ISDN subscriber line connection group (1) for any terminal configurations (analogue, digital terminals) with the capability of internal traffic between analogue and digital terminals is to be created. For this purpose, the ISDN subscriber line connection group (1) contains a computer unit (2, 3) with an internal bus (4) exhibiting an ISDN format, to which a digital (6), an analogue (11) and an ISDN network interface (5) are coupled, the computer unit (2, 3) being programmed in accordance with the respective terminal configuration.

Fiber-optic subscriber transmission system

Abstract: A fiber-optic subscriber transmission system is provided for accommodating a plurality of digital subscriber line signals and telephone signals. A plurality of subscribers is connected through telephone lines with remote nodes, which are connected with a terminal office through optical fibers. Remote nodes convert the signals sent by subscribers through telephone lines into digital signals. Then, the remote nodes convert the digital signals to light signals by time-division multiplexing and send them to the terminal office through optical fiber cables. The terminal office receives the light signals and extracts the original subscriber signals by demultiplexing and D/A conversion of the received light signals. Telephone signals and xDSL (x digital subscriber line) signals, which are multiplexed in the subscriber signals, are separated by a splitter and terminated by a telephone switch and an xDSL access multiplexer, respectively.