Topic
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.
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01 Jan 2007
TL;DR: In this paper, the performance of different versions of ADSL, VDSL and SHDSL in 0.4 mm twisted pair cables is compared with a cable containing only ADSL systems.
Abstract: This report contains simulations of performance for different versions of ADSL, VDSL and SHDSL in 0.4 mm twisted pair cables. An important part of the work has been to investigate the compatibility between different DSL systems. The range of SHDSL system compliant with ITU G.991.2 Annex G has been analysed. These systems allow for bitrates up to 3.848 Mbit/s and 5.696 Mbit/ for 16-PAM and 32-PAM systems respectively. The overall conclusion is that downstream ADSL and ADSL2+ is compatible with both SHDSL Annex G and HDSL systems. The degradation in bitrate of downstream ADSL due to these systems is moderate, less than 13% compared to a cable containing only ADSL systems. ADSL subloop means that an ADSL DSLAM is installed between the local exchange and the subscriber. The purpose is to reduce the loop length between the DSLAM and the subscriber in order to increase the bitrate. This subloop signal will represent a strong interference in the downstream direction of the ADSL systems from the local exchange. As is shown in Section 7 in this report there is a severe degradation in the downstream direction of the ADSL system from the local exchange. The remedy to reduce this degradation is to use power backoff in the subloop systems. Use of power backoff regimes is not analysed in this report. The potential bitrates for VDSL2 systems have been analysed for bandplans 997 and 998. The simulations show that bandplan 997 will give almost symmetrical up- and downstream bitrates for the cables less than 800 meters, whereas for bandplan 998 the downstream/upstream ratio is close to 2:1. Three different bandwidths have been analysed, 12 MHz, 17 MHz and 30 MHz. The frequency bands above 12 MHz are used only for loop lengths less than 800 meters. The frequency bands above 17 MHz are used only for loop lengths less than 650 meters. Bandplans that makes use of the lowest upstream band U0 can still provide adequate upstream capacity (1 Mbit/s) even for loop lengths in excess of 2 km. The downstream bitrate is significant (17-18 Mbit/s) for both 997 and 998 at these lengths.
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01 Jan 1997TL;DR: An overview of the analysis, numerical and simulation aspects of the high-speed digital subscriber line (HDSL) is presented, and the analytical techniques for generation and processing of the ABCD matrices are included.
Abstract: In this Chapter, an overview of the analysis, numerical and simulation aspects of the high-speed digital subscriber line (HDSL) is presented. The analytical techniques for generation and processing of the ABCD matrices are included. Computational data and file handling aspects are addressed. For the physical environment of the HDSL, the typical subscriber loop makeup, the overall topology and its physical distances over which the HDSL data transmission occurs are presented. The important features of the subscriber loops around the world are summarized. This Chapter covers two significant aspects of the organization of HDSL: (a) computational environment and (b) actual physical HDSL environments. The typical features necessary for a flexible approach to the yet evolving HDSL systems are retained in the software design. The evolving integrated network services to the subscribers open a variety of fundamental questions regarding their digital capabilities so far considered unimportant for the loop environments around the world. This software organization permits the designers to probe different national telecommunication environments regarding their status and compatibility to carry ISDN data.
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07 Aug 2002TL;DR: In this paper, the authors present an independent claim for a communications system for transmission of signalization information to a digital communications network subscriber, where the transmission method has at least one signalization message with a given protocol provided by a digital communication network (20) and transmitted to a subscriber (40,50) after conversion of the signalization protocol into a subscriber terminal protocol.
Abstract: The transmission method has at least one signalization information with a given protocol provided by a digital communications network (20) and transmitted to a digital communications network subscriber (40,50) after conversion of the signalization protocol into a subscriber terminal protocol, e.g. a digital subscriber signaling protocol suitable for user-to-user signaling services. An Independent claim for a communications system for transmission of signalization information to a digital communications network subscriber is also included.
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14 Sep 2011TL;DR: In this paper, the authors present a system for measuring transfer parameters of a digital subscriber line, where the data for measuring the transfer parameter is received and transmitted from a digital subscribers line router.
Abstract: The method involves arranging a digital subscriber line (3) between a switching center (7) i.e. digital subscriber line access multiplexer, of a network operator, and a subscriber connection. Data for measuring a transfer parameter is exchanged between a measuring server (9) and the subscriber connection, where the measuring server is assigned to the switching center. The data for measuring the transfer parameter is received and transmitted from a digital subscriber line router (4). A computer program is transferred to the digital subscriber line modem via online. An independent claim is also included for a system for measuring transfer parameters of a digital subscriber line.
01 Jan 2005
TL;DR: In this thesis some different modulation schemes for xDSL-techniques are compared and the modulation methods used are DMT, CA, CA and DMT.
Abstract: In this thesis some different modulation schemes for xDSL-techniques are compared. The investigated techniques are ADSL, G.lite, ADSL2, HDSL, SHDSL and VDSL. The modulation methods used are DMT, CA ...