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.

High-Speed Modems

Abstract: High-speed modems and standards have been developed to meet the user demands for high-speed data information and faster communications with the Internet. DSL modems have been successful in reaching a large population because of the low cost structure, reliability, and high-speed data rates. ADSL and versions of ADSL, such as G.lite addressed a need in the market for many users. Hybrids using ISDN and ADSL have been produced, and high speed DSL such as HDSL and VDSL are reaching even greater modem speeds. Cable modems are rapidly becoming a solution for high-speed information to the home and office. Many new standards for bringing voice, data, and video to the home are being established as higher speeds and the number of users continue to grow.

Extending the bandwidth of the local loop

Abstract: The authors consider the growth in demand for the delivery of new telecommunication services that require digital rather than analogue delivery. They highlight the problem that the provision of these services often requires the costly installation of new transmission media. For both service providers and end users, this can make the cost of serve provision prohibitive. High-speed digital subscriber line (HDSL) systems have been introduced in Europe, allowing transmission up to 2048 Mbit/s over conventional unscreened copper pairs. These systems combined with appropriate interfaces, will allow the timely and economic provision of a range of services that need up to a bit rate of 2048 Mbit/s. The authors consider the service applications of HDSL and develop a deployment strategy that allows the economic migration to fibre systems when service demands allow.< >

Communication control unit simulated training device

Abstract: The utility model relates to a communication control unit simulated training device, including MPU unit, LPU unit, interface unit, clock unit, human -computer interaction unit, radio station unit, a plurality of high -bit -rate digital subscriber line ways HDSL unit and electrical unit, LPU unit, interface unit, clock unit, human -computer interaction unit and a plurality of HDSL unit respectively with the MPU unit connection, MPU unit, LPU unit, interface unit, clock unit, human -computer interaction unit, radio station unit and a plurality of high -bit -rate digital subscriber line ways HDSL unit respectively with electrical unit connects The utility model discloses a communication control unit simulated training device has solved developing that communication equipment when training maintenance trouble hard sets up, the damage is big, causes defect with high costs, can develop including various training such as trouble decomposition and combination, fault detection and maintenances, and the simulation reproduces the true fault, improvement the training effect, reduce cost

Embedded Tutorial ET2: Digital Subscriber Line

Abstract: Digital Subscriber Line (DSL) is a family of standards that allow existing twisted pair copper lines to carry modulated digital signals which uses telephone network and unused frequency Spectrum. In this tutorial we describe DSL (Digital Subscriber Line), comparing with POTS and ISDN. We explain the different DSL flavors available with the modulation techniques used and also discuss challenges in getting high performance and throughput, achieving xDSL rate and meeting the DSL standard. We begin by introducing DSL having a pair of modems CO (Central office) and CPE (Customer Premises Equipment) and talk about frequency spectrums. We explain the limitations of POTS (Plain Old Telephone System) with Dial-up Connection and ISDN (Integrated Services Digital Network), and advantages of DSL over POTS. Next we describe various flavors of DSL with their frequency spectrums, power enhancements, standardization, profiles, and band plans. We discuss different modulation techniques with their advantages and disadvantages, including Single carrier Modulation like CAP and QAM and Multi Carrier Modulation like DMT. We explain the interferers/noise: Line Attenuation, The channel attenuation, Bridged taps, Impulse noise, White noise, NEXT, FEXT, RE Interference. We conclude the tutorial with a description of full activation and initialization phases. The targeted audience for the tutorial is designers, developers, testers, people working in the area of VDSL, ADSL technology and People working on different platforms like DSLAM's, Central office, Customer premises equipment, Gateway products as well as products related to access network who are familiar with copper line and modems.

Managed HDSL repeater

Abstract: A repeater for HDSL transmission is presented. The repeater replaces the regenerator commonly used in HDSL by utilizing the activation/deactivation process in the HDSL specification. The repeater is adjusted to detect an activation/deactivation sequence, whereby a flip-flop in the repeater is alternated. A first state of the flip-flop allows transmission passing through the repeater to the terminating point, e.g. a network terminal, and a second state loops transmission back to the originating point, e.g. a line terminal. The looping may then be utilized for maintenance and error detection and recovery. By use of one of the free bit in the overhead channel in the HDSL transmission as an origin bit, wherein “1” is set in the upstream direction, and “0” is set in the downstream direction, it is possible to detect at the line terminal whether there is a loop in the repeater.