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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.


Papers
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Patent
20 Mar 1998
TL;DR: In this paper, the amount of time a subscriber device is effectively out of service as a result of some fault or failure in telecommunications equipment is monitored, and the computer then determines from the updated record in accordance with one or more subscriber line blocking criteria a subscriber path blocking parameter.
Abstract: In a telecommunications system, the amount of time a subscriber device is effectively out of service as a result of some fault or failure in telecommunications equipment is monitored. Subscriber devices are connected by corresponding subscriber communication paths to receive information from or transmit information to a telecommunications center such as a local telephone exchange. One or more data records is maintained in computer memory for each subscriber path connected to the communications center. Each data record is updated using recently determined data relating to the operational status of each subscriber path. The computer then determines from the updated record in accordance with one or more subscriber line blocking criteria a subscriber path blocking parameter. The subscriber path blocking parameter may represent for example an average amount of time each subscriber path satisfies the one or more subscriber line blocking criteria.

8 citations

Patent
21 Aug 1978
TL;DR: In this paper, the authors proposed to transmit the signals with multiplication without using any modulation and demodulation unit for two wire type subscriber lines, by coupling the audio analog signal for telephone with the transmission line with a low pass filter and the digital signal with a high pass filter.
Abstract: PURPOSE:To transmit the signals with multiplication without using any modulation and demodulation unit for two wire type subscriber lines, by coupling the audio analog signal for telephone with the transmission line with a low pass filter and the digital signal with a high pass filter. CONSTITUTION:The telephone set 1 installed in a subscriber and the digital terminal unit 2 are coupled with the exchanger 5 with a pair of two line type subscriber lines 3. That is, the telephone set 1 is coupled with the subscriber line 3 via the low pass filter 7 about 4kHz in cut-off frequency, and the digital signal terminal unit 8 is coupled to the subscriber line 3 via the high pass filter about 4kHz in cut-off frequency. Further, the line is coupled with the exchanger 5 via the equal high and low pass filters 9 and 7, and the transmission line in intra-city or between stations 12 and the digital transmission unit 13 are connected at the trunk side of the exchanger 5.

8 citations

Proceedings ArticleDOI
J.P. Cornil1, Z.Y. Chang, F. Louagle, W. Overmeire, J. Verfaille 
15 Feb 1999
TL;DR: In this article, the authors describe an asymmetric digital subscriber line (ADSL) circuit with at least 66 dB of dynamic range for full performance, where the circuit operates either as ATU-C (central office) or customer premises) ADSL analog front-end by swapping upstream and downstream filters.
Abstract: Asymmetrical digital subscriber line (ADSL) provides robust transport of data at up to 8 Mb/s on common twisted pair without interfering with classical telephone service. ADSL uses multicarrier modulation (DMT) to modulate up to 256 QAM into a 1.104 MHz frequency band, which requires a signal path with at least 66 dB of dynamic range for full performance. The circuit described operates either as ATU-C (central office) or as ATU-R (customer premises) ADSL analog front-end by swapping upstream and downstream filters.

8 citations

Patent
Chul-Hee Lee1
07 Jul 2003
TL;DR: In this paper, a composite voice service terminal apparatus enables a user or subscriber to selectively use Subscriber Line Interface Circuit (SLIC/SLAC), voice digital signal processor (DSP), processor, asymmetric digital subscriber line analog front end (ADSL AFE), multiplexer (MUX), and relay switch to maintain an on state so that the user can use a general phone, and receive an off signal from the processor and interrupt a general telephone line when the user has pressed a specific digit for digital network services.
Abstract: A composite voice service terminal apparatus enables a user or subscriber to selectively use Subscriber Line Interface Circuit/Subscriber Line Audio processing Circuit (SLIC/SLAC), voice digital signal processor (DSP), processor, asymmetric digital subscriber line digital signal processor (ADSL DSP), asymmetric digital subscriber line analog front end (ADSL AFE), multiplexer (MUX) for outputting data to one of the channels from the digital tone generating unit and the voice digital signal processor, digital tone generating unit for including sources of a dial tone, ring back tone, busy tone, and guide tones of voice over Internet protocol (VoIP), voice over digital subscriber line (VoDSL), and voice over multi-service broadband networks (VoMBN), generating a tone corresponding to a selected mode, and transmitting the tone to the Subscriber Line Interface Circuit/Subscriber Line Audio processing Circuit through the multiplexer, and a relay switch to maintain an on state so that the user can use a general phone, and receive an off signal from the processor and interrupt a general phone line when the user has pressed a specific digit for digital network services.

8 citations

Proceedings ArticleDOI
01 Dec 2014
TL;DR: An analytical model of ICSI capturing differences in modulation between G.fast and VDSL2 results in significant bit-rate losses compared to an interference-free scenario for particular network topologies.
Abstract: G.fast is the next-generation digital subscriber line (DSL) technology targeting bit-rates of up to 1 Gbps. Very high speed digital subscriber line 2 (VDSL2) is the the latest DSL technology delivering bit-rates of up to 100 Mbps. Replacement of VDSL2 by G.fast modems will be gradual, which implies coexistence of these two systems. G.fast and VDSL2 use different symbol durations, carrier frequency spacings, and sampling rates, which results in inter-carrier and inter-symbol interference (ICSI). We derive an analytical model of ICSI capturing these differences in modulation. Furthermore, through simulations we show that for particular network topologies coexistence of the two systems results in significant bit-rate losses compared to an interference-free scenario.

8 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20181
20171
20162
20154
20144
20132