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Showing papers on "High-bit-rate digital subscriber line published in 1999"


Patent
Gin Liu1, Michael A. Campbell1
31 Aug 1999
TL;DR: In this paper, a single-ended qualification of subscriber loops for xDSL services is described, which involves first screening a subscriber loop database record for disqualifying devices or services on the subscriber loop.
Abstract: A method and apparatus for single-ended qualification of subscriber loops for xDSL services is described. The method involves first screening a subscriber loop database record for disqualifying devices or services on the subscriber loop. If none are found, a set of predetermined electrical characteristics of the subscriber loop are derived from information in the database, or directly measured using test equipment at a central office end of the subscriber loop. The electrical characteristics are used to compute an available bandwidth on the subscriber loop for xDSL services. The advantage is the rapid and inexpensive qualification of subscriber loops which reduces response time to potential customer queries and facilitates deployment of xDSL services.

75 citations


Patent
30 Jul 1999
TL;DR: In this article, a system for determining the data rate capacity of a digital subscriber line includes a communication server coupled to a number of subscribers using twisted pair subscriber lines, and a memory coupled to the communication server stores attenuation information and noise information for the twisted pair subscribers lines.
Abstract: A system for determining the data rate capacity of a digital subscriber line includes a communication server coupled to a number of subscribers using twisted pair subscriber lines. A memory coupled to the communication server stores attenuation information and noise information for the twisted pair subscriber lines. A processor coupled to the memory determines the data rate capacity of a selected twisted pair subscriber line using the attenuation information and the noise information.

55 citations


Patent
16 Aug 1999
TL;DR: In this article, a digital subscriber loop modem arrangement is arranged to respond to a fault condition so as to provide at least a voice lifeline service over DSL service on a digital user line in which data and voice traffic are transported on a plurality of carriers.
Abstract: A digital subscriber loop modem arrangement is arranged to respond to a fault condition so as to provide at least a voice lifeline service over DSL service on a digital subscriber line in which data and voice traffic are transported on a plurality of carriers. On detection of a power loss at the subscriber end of the line, the number of carriers is reduced so as to maintaining transmission only of those carriers transporting the voice traffic. This reduces the power demand which can now be met from the remote end of the line. A method of operating a digital subscriber loop modem arrangement under a fault condition so as to provide at least a voice over DSL service on a digital subscriber line in which data and voice traffic are transported on a plurality of carriers, the method comprising the steps of: replacing the data with random data, disabling those data carriers on which the random data is transported, and maintaining transmission of those carriers transporting the voice traffic.

52 citations


Patent
24 Jun 1999
TL;DR: In this paper, a communication system includes a plurality of subscribers having a telephone set and different types of home modems coupled using twisted pairs to a local server (local server) that includes plurality of down stream repeaters (44), a central office (30, 31), coupled with a twisted pair subscriber lines (29, 31).
Abstract: A communication system includes plurality of subscribers (22) having a telephone set (34) and different types of home modems (36) coupled using twisted pairs to a local server (24) that includes plurality of down stream repeaters (44), a central office (30) coupled to a local server using twisted pair subscriber lines (29, 31). The central office includes a telephone switch (54) that provides telephone service to the subscribers and a concentrator (56) that connects a plurality of upstream repeaters (46) with a number of office modems (58) that provide data service to the subscriber. A communication system uses CAP or DMT line signals with time division. The line signal transmits with different time framing. Every subscriber line can work in one of three operation modes: Asymmetrical mode, Half-Asymmetrical mode, Symmetrical mode. An office modem changes the operation mode of subscribers line and downstream/upstream bit rate depending on the type of an information source and the type of the subscriber home modem that is connected to the office modem in the current transmit cycle.

40 citations


Patent
08 Jun 1999
TL;DR: In this paper, a switch matrix bus including several parallel lines (1-8) is placed in the access node and a controlled switch element (SE1, SE2) connects a line coming from a test relay (R3) located between the end of the subscriber line (e.g. SL3) and its interface to the switch matrices bus instead of the test bus.
Abstract: Upgrading of a subscriber connection to another requires an upgrading work done by an electrician. According to the invention, the type of connection is upgraded by remote control. A switch matrix bus including several parallel lines (1-8) is placed in the access node. Connected fixedly in advance to the bus are interface units of an ADSL connection and, when desired, of an ISDN connection, however, in such a way that only one interface is connected actively to one bus line at a time. A controlled switch element (SE1, SE2) connects a line coming from a test relay (R3) located between the end of the subscriber line (e.g. SL3) and its interface to the switch matrix bus instead of the test bus. With a remote control signal supplied through network management a choice is made of which test relay connects the connected subscriber line to the controlled switch element. Since the line or wire couple of the switch matrix bus for its part is connected fixedly to the interface of the ISDN or ADSL subscriber connection, this means that the subscriber line can be connected by way of the switch matrix bus to the ISDN or ADSL interface instead of the original analog interface, or the subscriber line may be connected to the ADSL interface instead of the original ISDN interface. In this way, any subscriber line may be upgraded to a connection of another type by remote control.

35 citations


Patent
30 Jul 1999
TL;DR: In this paper, a method and system for determining the high speed data service capability of a subscriber line includes sending an embedded test signal to the subscriber line, and a reflected signal received in response to the test signal is analyzed for determining transmission characteristics.
Abstract: A method and system for determining the high speed data service capability of a subscriber line includes sending an embedded test signal to a subscriber line. A reflected signal received in response to the test signal is analyzed for determining transmission characteristics of the subscriber line. Based on the reflected signal, a determination about the high speed data service capabilities of the subscriber line is made and stored for future reference.

26 citations


Proceedings ArticleDOI
15 Feb 1999
TL;DR: This highly-integrated CMOS AFE is compatible with both the full ADSL T1E1.413 DMT standard and the emerging G.lite standard, and achieves 14 b linearity in both RX and TX paths and input-referred noise better than -160 dBm/Hz, from a single 5.0 V supply.
Abstract: Asymmetric digital subscriber line (ADSL) technology meets the need for high-bandwidth communications to the home utilizing the existing twisted-pair copper. In an ADSL modem, noise and linearity of the analog front end (AFE) are critical to the data rate achievable over the longest lines (up to and above 18 kfeet of AWG24 wire) and hence the fraction of installed lines over which ADSL service can be deployed. In multitone ADSL, dynamic linearity throughout the band determines modem capacity. This highly-integrated CMOS AFE is compatible with both the full ADSL T1E1.413 DMT standard and the emerging G.lite standard, and achieves 14 b linearity in both RX and TX paths and input-referred noise better than -160 dBm/Hz, from a single 5.0 V supply. These noise and linearity specifications are necessary for an ADSL modem to operate at 1.5 Mb/s on the longest lines and reach >90% of installed copper connections.

22 citations


Journal ArticleDOI
M.S. Kappes1
16 May 1999
TL;DR: In this paper, a fully differential CMOS line driver for use in high bit-rate digital subscriber line (HDSL) services is presented, which is fabricated in a single-poly quad metal 0.35-/spl mu/m process and achieves <-70dB total harmonic distortion while driving up to /spl plusmn/2.
Abstract: A fully differential CMOS line driver for use in high bit-rate digital subscriber line (HDSL) services Is presented. The circuit is fabricated in a single-poly quad metal 0.35-/spl mu/m process and achieves <-70-dB total harmonic distortion while driving up to /spl plusmn/2.4-V, 200-kHz signals into 30 /spl Omega/ with a 3-V supply. The circuit features a closed loop gain of 6.0 with minimal input capacitance (<200 fF). The circuit requires less than 20 mA of quiescent current and is capable of delivering dynamic currents as large as 180 mA. The circuit is a multistage amplifier utilizing nested-Miller compensation and an enhanced class AB output stage.

21 citations


Proceedings ArticleDOI
05 Dec 1999
TL;DR: In the presented equalizer the usual (over-optimistic) assumption of error-free decisions at the input of the feedback filter is relaxed and numerical results supporting the actual effectiveness of the proposed MAP/DF equalizer are provided.
Abstract: A novel version of the reduced-state Bayesian maximum a posteriori probability/decision-feedback (MAP/DF) equalizer for ISI channels with long impulse responses is presented. The main feature of the proposed equalizer is that the soft-statistics generated by the MAP receiver are employed to recursively compute a suitable index of the actual reliability of the (soft) decisions feeding the DF filter. Therefore, in the presented equalizer the usual (over-optimistic) assumption of error-free decisions at the input of the feedback filter is relaxed and numerical results supporting the actual effectiveness of the proposed MAP/DF equalizer are provided for the so-called high-bit-rate digital subscriber line (HDSL) test-loop # 4.

15 citations


Patent
07 Apr 1999
TL;DR: In this article, the use of an existing subscriber link and the AC power lines within the subscriber system (10) allows for a cost effective and efficient technique for providing interactive services to subscribers connected to an existing telephone backbone.
Abstract: A subscriber system (10) includes a dual network interface module (12). The dual network interface module (12) includes slots for a video unit (20) and a bandwidth unit (22). The video unit (20) receives broadcast information from a service provider (24) for ultimate display and viewing by a subscriber at the subscriber system (10). The bandwidth unit (22) provides an interface to a telecommunications network (30) through a telecommunications element (28). The dual network interface module (12) also includes an AC carrier modem (32) that receives and sends information to a processor device (34) over existing AC power lines within the subscriber system (10). In this manner, interactive interfacing of broadcast information received at the video unit (20) can be performed at the processor device (34) through the bandwidth unit (22) and over the telecommunications network (30) on a real time basis. The use of an existing subscriber link (26) and the AC power lines within the subscriber system (10) allows for a cost effective and efficient technique for providing interactive services to subscribers connected to an existing telephone backbone.

15 citations


Proceedings ArticleDOI
15 Feb 1999
TL;DR: In this paper, a very high-speed DSL (VDSL) modem with synchronized discrete multi-tone (SDMT) line code is implemented in 035 /spl mu/m CMOS double-poly-triple-metal process and consumes 550 mW at 2208 MHz sample rate with a single 33 V supply.
Abstract: Digital subscriber loop (DSL) technology allows high-speed transmission between the telephone central office and subscriber premises using existing unshielded twisted-pair loop plant, coexisting with telephony Very-high-speed DSL (VDSL) is a new service aimed at loop lengths up to 3000 m, providing 2-52 Mb/s data The VDSL signal occupies the 02-11 MHz spectrum This IC provides the analog functions required in a VDSL modem that uses synchronized discrete multi-tone (SDMT) line code It is implemented in 035 /spl mu/m CMOS double-poly-triple-metal process and consumes 550 mW at 2208 MHz sample rate with a single 33 V supply The die measures 180/spl times/150 mil/sup 2/

Journal ArticleDOI
TL;DR: In this paper, the authors discuss the technology involved and its implementation, and various aspects of the service are considered together with Internet access for asymmetric digital subscriber line (ADSL) modems delivering voice and high-speed data simultaneously over ordinary twisted pairs.
Abstract: Asymmetric digital subscriber line (ADSL) modems deliver voice and high-speed data (at up to 6 Mb/s) simultaneously over ordinary twisted pairs. The author discusses the technology involved and its implementation. Various aspects of the service are considered together with Internet access.

Patent
08 Jan 1999
TL;DR: In this article, the authors propose a line circuit between the network termination at the customer premises and a D4 channel bank carrying data on two combined B-channels and an embedded operations channel (EOC).
Abstract: A subscriber's data circuit between channel bank and the customer premises carries fractional T1 bandwidth on a digital subscriber line (DSL) circuit For example, for an ISDN rate digital subscriber line (IDSL), the circuit between the network termination at the customer premises and a D4 channel bank carries data on two combined B-channels Such a circuit also carries a D-channel and an embedded operations channel (EOC), in normal ISDN fashion A data service using such a line circuit, however, only transports the data (combined B-channels) through the network The D-channel and the EOC are not carried through the network To facilitate testing of the subscriber's circuit, the carrier operations and testing facilities transmit loop-back commands or the like in band to the channel bank A command may be addressed to any active node along the subscriber's DSL circuit The line card serving the subscriber in the channel bank detects the commands, removes the commands from the in-band data and reformats the commands for transmission over the EOC channel The line card addresses the commands and sends the EOC format commands over the DSL circuit to the appropriate node along the subscriber's line In response, the node connects the circuit in a loop-back mode, to enable test signal transmission and analysis

Patent
30 Sep 1999
TL;DR: In this article, a line terminating device for a subscriber line which transmits and receives broadband signals via a single subscriber line, a broadband signal being composed of a broadband or narrowband audio-frequency data signal and a broadband higher frequency data signal, essentially not overlapping.
Abstract: The invention relates to a line terminating device for a subscriber line which transmits and receives broadband signals via a single subscriber line, a broadband signal being composed of a broadband or narrowband audio-frequency data signal and a broadband higher-frequency data signal and the frequency bands of the voice signal and of the data signal essentially not overlapping. The line terminating device according to the invention has a digital frequency separating filter in the digital section of the line terminating device, which is arranged in the digital section of the line terminating device so that the audio-frequency voice signal is separated from the higher-frequency data signal. In particular, the line terminating device is suitable for separating an ISDN or POTS voice signal from an ADSL data signal.

Patent
22 Nov 1999
TL;DR: In this paper, an ADSL subscriber is connected with an ATM layer processing device by transmit-receive cellbus and control signal bus and connected with a number of ADSL subscribers by ADSL line.
Abstract: An ADSL subscriber processing equipment in ATM switch is provided. The ADSL subscriber is connected with ATM layer processing device by transmit-receive cellbus and control signal bus and is connected with a number of ADSL subscribers by ADSL line. The ADSL (asymmetric digital subscriber line) subscriber processing equipment in accordance with the present invention includes transmit-cell processing means ATM physical layer processing means ADSL processing means receive-cell processing means and central control means.

Patent
14 Jun 1999
TL;DR: In this article, a central office modem maps a DS1 payload into HDSL transport frames at 1.544 Mbps, using a DS 1 timing reference signal generated by a building integrated timing supply (BITS) having global positioning system (GPS) capability.
Abstract: Timing information, such as stratum 1 traceable synchronization information, is transmitted in a high-bit-rate digital subscriber line (HDSL) transport frame by timing the transport frame using a corresponding timing reference signal. In an illustrative embodiment, a central office modem maps a DS1 payload at 1.544 Mbps into HDSL transport frames at 1.552 Mbps, using a DS1 timing reference signal generated by, e.g., a building integrated timing supply (BITS) having global positioning system (GPS) capability. The transport frame is transmitted by the central office modem to a customer premises modem which demaps the transport frames to recover the DS1 payload and the DS1 timing reference signal. The recovered timing reference signal is then delivered to an external timing input of a computer, set-top box or other customer premises equipment (CPE). Synchronization status messages (SSMs) may be included in the timing information transmitted between the central office and customer premises modems. The invention is applicable to DSL signals other than HDSL2, including, e.g., single-pair HDSL signals, multiple-pair HDSL signals, as well as other types of signals used in conjunction with the transport of information over existing wired connections.

Patent
24 Nov 1999
TL;DR: In this paper, a digital subscriber line transmission system using QAM modulation on several equally spaced discrete tones, using, at a high transmission rate, N=2048/p or 4096/p tones spaced by 4.3125p KHz, where p is a power of 2.
Abstract: A digital subscriber line transmission system using QAM modulation on several equally spaced discrete tones, uses, at a high transmission rate, N=2048/p or 4096/p tones spaced by 4.3125p KHz, where p is a power of 2.

Patent
01 Dec 1999
TL;DR: In this article, the authors propose a method for providing Digital Subscriber Line (DSL) service to a group of subscribers over respective subscriber loops in the presence of another, existing digital network service provided on at least some of the subscriber loops.
Abstract: A method for providing Digital Subscriber Line (DSL) service to a group of subscribers over respective subscriber loops in the presence of another, existing digital network service provided on at least some of the subscriber loops. Lower, middle and upper frequency bands are assigned for transmission over the subscriber loops, such that the existing digital network service is provided on the lower band. DSL signals are transmitted downstream on the upper band and are received upstream on the middle band, generally without transmitting or receiving DSL signals on the lower band, over those subscriber loops on which the existing digital network service, is provided. Over those subscriber loops on which the existing digital network service is not provided, the DSL signals are transmitted downstream on the lower and upper bands and are received upstream on the lower and middle bands.

Proceedings ArticleDOI
F. Pecourt1, J. Hauptmann, A. Tenen
15 Feb 1999
TL;DR: This paper describes an integrated analog hybrid, which reduces the resolution needed in the ADC by more than 2b, which is applicable to full duplex data transmission on 2-wire copper lines.
Abstract: For high speed data modems, such as those for ADSL/HDSL, full-duplex transmission at bit-rates in the range of 10 Mb/s on 2-wire copper lines requires sophisticated designs Complex data pump algorithms, as well as high performance analog front ends are required Transmitting data simultaneously in both directions (full duplex) over a two wire twisted pair means that modems have to handle strong echo signals (transmit signal that comes back via receive path), while the received signal is strongly attenuated by the line itself For transmit data in frequency division mode, transmit and receive signals can be well separated by high-order analog filtering For overlapping bandwidths, the strong echo has to be suppressed either by an analog hybrid or digitally which requires extremely high resolution A/D converter (>15 b) This paper describes an integrated analog hybrid, which reduces the resolution needed in the ADC by more than 2b

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.

Proceedings ArticleDOI
05 Dec 1999
TL;DR: A new approach, based on a numerical optimization procedure is presented and possible strategies for setting the individual power back-off (PBO) levels are discussed.
Abstract: Very high-bit rate digital subscriber line (VDSL) transmission systems are performance limited to a significant degree by far-end crosstalk (FEXT). In a deployment scenario, where the customer equipment (network termination, NT) is physically placed at different locations along a cable, the transmit power of each modem has to be chosen carefully (backed-off) to obtain satisfactory performance for each modem in the cable. A new approach, based on a numerical optimization procedure is presented and possible strategies for setting the individual power back-off (PBO) levels are discussed.

Patent
03 Nov 1999
TL;DR: In this paper, it is shown that it is a simple matter to organize dynamic switching between users connected to the same access unit or neighboring access units in the same exchange and other calls are routed to other exchanges.
Abstract: To provide a high bit rate link between telecommunication network users, HDSL modems are installed on the user premises and at corresponding subscriber line termination units in an exchange. The modems in the exchange are connected to access units of the exchange which include networks of add and drop multiplexers interconnected in a ring and connected to a drop port. It is shown that it is a simple matter to organize dynamic switching between users connected to the same access unit or neighboring access units in the same exchange. Other calls are routed to other exchanges.

Patent
14 May 1999
TL;DR: In this paper, the authors proposed a method for the optimal definition of the complexity of a desired or existing telecommunication link between two subscribers (1, 7) in order to determine the rate, where one subscriber is a mobile subscriber having a mobile radiotelephone, while the other is a fixed subscriber connected to a fixed network.
Abstract: The present invention relates to a telecommunication network and to a method for the optimal definition, on a telecommunication network side, of the complexity (6), on the telecommunication network side, of a desired or existing telecommunication link (6) between two subscribers (1, 7) in order to determine the rate. According to this invention, one subscriber is a mobile subscriber (1) having a mobile radiotelephone, while the other is a fixed subscriber (7) connected to a fixed network. The position (2, radio cell 23a) of the mobile subscriber (1) is then detected. A local call is detected in the case of a telecommunication link (40) between the mobile subscriber (1) and a fixed subscriber (4) whose connection to the fixed network is located, due to the fixed network code, within a local area (3) surrounding the position (2, radio cell 23a) of the mobile subscriber (1). A toll call, which is relatively more expensive than a local call, is detected in the case of a telecommunication link (6) between the mobile subscriber (1) and a fixed subscriber (7) whose connection to the fixed network is located, due to the fixed network code, out of a local area (3) that can be predetermined and that surrounds the position (radio cell 23a) of the mobile subscriber (1).

Patent
21 Jan 1999
TL;DR: In this article, the authors propose a communication channel unit card with a plurality of spans for communicating wideband telecommunications signals with an external network and a processor node for controlling operation of the mapping circuit and the plurality of span interfaces.
Abstract: A telecommunications channel unit card including a subscriber bus interface for communicating subscriber bus signals with a digital loop carrier matrix, a mapping circuit for mapping between subscriber bus signals and wideband telecommunications signals, a plurality of spans for communicating wideband telecommunications signals with an external network, and a processor node for controlling operation of the mapping circuit and the plurality of span interfaces.

Patent
Osamu Kuboniwa1
30 Nov 1999
TL;DR: An asymmetrical digital subscriber line (ADSL) system for transferring an analog audio signal and high speed digital data on the side of a subscriber, from and to a station, through one ADSL subscriber line, includes an apparatus on the subscriber side which converts an analog signal into a digital audio signal, and a line concentrator to concentrate the audio signal together with highspeed digital data by time division, and supplied to the subscriber line after modulation as discussed by the authors.
Abstract: An asymmetrical digital subscriber line (ADSL) system for transferring an analog audio signal and high speed digital data on the side of a subscriber, from and to a station, through one ADSL subscriber line, includes an apparatus on the subscriber side which converts an analog audio signal into a digital audio signal. The apparatus includes a line concentrator to concentrate the audio signal together with high-speed digital data by time division, and supplied to the subscriber line after modulation. An apparatus on the station side simultaneously supplies a signal received from the subscriber side to an analog telephone network, and supplies high-speed digital data to a high-speed digital data network. Each digital audio signal as well as each high-speed digital data is converted into asynchronous transfer mode (ATM) cells in each respective line concentrator, and each destination address is attached to the ATM cells.

Proceedings ArticleDOI
23 Aug 1999
TL;DR: The ADSL transceiver chipset is to be used in VOD, interactive interact service and/or teleconferencing system, etc, and the operating frequency and dissipated power of the chip are 40 MHz and 5 W at 5 V.
Abstract: Multimedia service with audio and video have become most desirable as the ADSL technology ideally converted from 1.5 Mbps full duplex HDSL technology via two twist-pair into 6.144 Mbps transmission technology via single twist-pair. This results in an interactive transmission service of T1 & E1 class data using the subscriber line without repeaters. The ADSL transceiver chipset is configured by DMT (Discrete Multi Tone modulation) scheme and RISC-based DSP core structure. Our ADSL chip is to be used in VOD, interactive interact service and/or teleconferencing system, etc. The operating frequency and dissipated power of the chip are 40 MHz and 5 W at 5 V.

Patent
22 Jun 1999
TL;DR: In this article, a method for setting up a telecommunications connection from a calling subscriber (A) to a called subscriber (B) who is assigned to a numbering-plan area (AREA 2 ) shared by two or several subscriber line networks (KN 2, KN 3, KN 4 ) of different network operators (OP 2, OP 3, OP 4 ) as well as a communications network (KN 6 ) and a service control point (SCP) for implementing the method.
Abstract: A method for setting up a telecommunications connection from a calling subscriber (A) to a called subscriber (B) who is assigned to a numbering-plan area (AREA 2 ) shared by two or several subscriber line networks (KN 2 , KN 3 , KN 4 ) of different network operators (OP 2 , OP 3 , OP 4 ) as well as a communications network (KN 6 ) and a service control point (SCP) for implementing the method. A call request (CR) from subscriber line network (OP 2 ) of the calling subscriber is routed to the communications network (KN 6 ), which is assigned to a long distance carrier (OP 6 ), and the connection between the calling subscriber (A) and the called subscriber (B) is set up via this communications network (KN 6 ). The arrival of the call request (CR) at the communications network (KN 6 ) of the long distance carrier (OP 6 ) triggers an IN service. The IN service executes for the call request both an access monitoring function that monitors access to the communications network (KN 6 ) of the long distance carrier (OP 6 ) and a number portability function that determines the subscriber line network (KN 3 ) of the called subscriber (B).

Journal ArticleDOI
TL;DR: Broadcast digital subscriber lines (BDSL) can provide a cost-effective architecture to deploy digital broadcast services in the near future by utilizing the in-place unshielded twisted-pairs to reduce the cost.

Patent
18 Jan 1999
TL;DR: In this paper, a fixed connection between the arrangements on the subscriber side and the exchange side, and an access arrangement of the data transmission network, is proposed to detect the beginning of a data transmission, whereby remaining parts (DI, DSP, AI, LT) are made operative only with the occurrence of such a criterion.
Abstract: The method involves operating arrangements for a high bit-rate data transmission on a subscriber line connecting one subscriber arrangement and a telecommunications exchange, on which speech- and low bit-rate data can also be transferred, in the course of a data connection leading over a data transmission network and bypassing the central parts of the exchange. A fixed connection can consist between the arrangements on the subscriber side and the exchange side, and an access arrangement of the data transmission network. Only those parts (SD) are operative in the terminal arrangements at the subscriber side and/or the exchange side of the subscriber line, which, other than for a data transmission, serve to the detection of a criterion indicating the beginning of a data transmission, whereby remaining parts (DI, DSP, AI, LT) are made operative only with the occurrence of such a criterion.

Patent
10 Mar 1999
TL;DR: In this paper, the authors present an integrated services digital network telecommunications installation, which has an interface on the exchange side for connection to a network terminator basic access device (1) or for direct connection to digital exchange (2), with a coupling field and transcoder for bit rate conversion inserted between the opposing interfaces, each provided with a memory for temporary storage of data.
Abstract: The telecommunications installation (3) has an interface on the exchange side for connection to a network terminator basic access device (1), or for direct connection to a digital exchange (2) and an interface on the subscriber side for connection to a number of subscriber devices (4,5), with a coupling field and a transcoder for bit rate conversion inserted between the opposing interfaces, each provided with a memory for temporary storage of data. OF DLRAWING - The drawing shows an integrated services digital network telecommunications installation. Network terminator basic access, 1. Digital exchange, 2. Telecommunications exchange, 3. Subscriber devices, 4, 5.