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.

Digital subscriber line signal processing method, device and digital subscriber line system

Abstract: Disclosed in the embodiments of the present invention are a digital subscriber line signal processing method, a device and a digital subscriber system. The signal processing method comprising: use symbols of frames to be transmitted to carry data to be transmitted; obtain the number of remaining symbols, said remaining symbols not carrying any data to be transmitted and being located within the frame to be transmitted carrying data to be transmitted; within the frame to be transmitted carrying data to be transmitted, add quantitative information of the remaining symbols and send frames carrying data to be transmitted and having quantitative information of remaining symbols. The embodiments of the present invention, by means of adding quantitative information of remaining symbols not carrying data to be transmitted, informs the receiver of the existence of remaining symbols not carrying data to be transmitted. Thus, processing is not executed on remaining symbols, thereby saving processing power for the TDD DSL system, reducing consumption, and causing the TDD DSL system to be energy efficient.

Telecommunication system for providing subscriber with both of narrow band service and wide band service, subscriber equipment, shelf therefor, exchangeable low-pass filter device, line terminating equipment and network termination

Abstract: PROBLEM TO BE SOLVED: To provide a subscriber with a wide band digital communication service by utilizing a telephone line. SOLUTION: This telecommunication system for providing both of a narrow band service and a wide band service in the sites of the plural subscribers is provided with at least one shelf for connecting a public exchange telephone network (PSTN) and an asynchronous transfer mode(ATM) network through corresponding plural twisted pair copper wires 36 to plural subscriber sites for connection to the PSTN and the connection to the ATM network and plural subscriber modems for the connection to the corresponding plural twisted pair copper wires 36. The respective twisted pair copper wires 36 provide asymmetrical digital subscriber lines so as to provide both of a conventional telephone service (POTS) and the digital channel of an ATM format.

Upgrading strategy generalization for b-ISDN fiber-optic subscriber loop systems

Abstract: Strategies for developing broadband subscriber loops economically are investigated. Proposed strategies aim at a practical implementation of fiber-optic subscriber loops. System implementation cost is reduced by restricted use of expensive optical components. The system can be upgraded in accordance with the trends of optical component cost reduction. An optimum upgrading strategy is selected with respect to several network parameters in subscriber loops. Sensitivity analysis is also carried out for some typical subscriber distribution models. >

Achievable rates vs. operating characteristics of local loop transmission: HDSL, HDSL2, ADSL and VDSL

Abstract: Prior work has focused on achievable rates for digital subscriber lines, only to have future technology surpass the "achievable" bounds. This paper focuses on how achievable rates vary under different operating characteristics. We show how the achievable rates change as transmission moves from echo-cancelled symmetric transport (HDSL), to frequency-division transport (original ADSL), partially overlapped transport without bandwidth coordination (echo-cancelled ADSL), to partially-overlapped, frequency-coordinated transmission (HDSL2). The limitations of spectral compatibility and crosstalk from existing services are discussed as they effect the fundamental limits and deployable services. The lessons learned are related to higher rate services in a next-generation network employing VDSL.

Subscriber line digital multiplex control system

Abstract: PURPOSE:To control a remote subscriber by selecting the start of a multiplex subscriber with competition and providing a signal line for competition used for the response request of an upper station managed multiplexedly and a common signal path used for multiplex processing of a monitor and a control signal for the subscriber. CONSTITUTION:When a subscriber 6 hooks up a handset, an A/D converter 7 detects a loop, and its call information is given to a subscriber controller 11 via the A/D converter 10. When the subscriber controller 11 discriminates the subscriber 6, ''1'' is set to a bit number 5 in A-D from the bit number 5 to 8 of a time slot TS0 of a multi-frame F1 assigned to a remote subscriber to set the state of the presence of start cause. Further, a control signal input device 9 is inserted and the signal is inserted and transmits the control signal to a digital exchange 1. The digital exchange 1 monitors the start cause of the remote subscriber at all times, and the signal of the presence of the start cause is inputted to the digital exchange via a subscriber repeater 4, a repeater 3, and a digital input/output device 2.