WO1999018712A1 - MODEMS xDSL ET RTPC COMBINES DANS UNE PLATE-FORME UNIQUE - Google Patents

MODEMS xDSL ET RTPC COMBINES DANS UNE PLATE-FORME UNIQUE Download PDF

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Publication number
WO1999018712A1
WO1999018712A1 PCT/US1998/021112 US9821112W WO9918712A1 WO 1999018712 A1 WO1999018712 A1 WO 1999018712A1 US 9821112 W US9821112 W US 9821112W WO 9918712 A1 WO9918712 A1 WO 9918712A1
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WO
WIPO (PCT)
Prior art keywords
xdsl
pcm
modem
analog
data
Prior art date
Application number
PCT/US1998/021112
Other languages
English (en)
Inventor
Andrew L. Norrell
Philip A. Desjardins
Original Assignee
3Com Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3Com Corporation filed Critical 3Com Corporation
Priority to AU97893/98A priority Critical patent/AU9789398A/en
Publication of WO1999018712A1 publication Critical patent/WO1999018712A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13003—Constructional details of switching devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13039—Asymmetrical two-way transmission, e.g. ADSL, HDSL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13093—Personal computer, PC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13107—Control equipment for a part of the connection, distributed control, co-processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1319—Amplifier, attenuation circuit, echo suppressor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13199—Modem, modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13292—Time division multiplexing, TDM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13322—Integrated circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13362—Asynchronous systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13396—Signaling in general, in-band signalling

Definitions

  • This invention relates to the field of data communication and more particularly to apparatus for receiving and transmitting data communications over voice-grade telephone circuits.
  • the telephone networks convert the voice signals to digital representation at the central office for the purpose of switching, routing and long haul delivery to the destination.
  • the digital bandwidth available for each voice signal is 56-64 kbps (thousand bits per second). This establishes an absolute raw data carrying capacity for telephone networks.
  • PSTN public switched telephone network
  • ADSL Asymmetric Digital Subscriber Loop
  • ADSL is intended to operate on a very high percentage of subscriber loops in industrialized countries at speeds of 384 kbps to 6 Mbps.
  • Typical applications for ADSL are high speed Internet access and video on demand.
  • the device used to couple data terminal equipment to the analog phone line for xDSL transmission is referred to generically in the art as a DSL modem.
  • the DSL modem performs signal modulation and demodulation, and also deals with impairments in the transmission channel such as attenuation, distortion and reflection, and performs other functions such as line probing and transmission rate adaptation.
  • the ADSL modems Since DSL modems operate outside of the voice band, and outside of the frequency capabilities of existing telephone company equipment, in the prior art the ADSL modems have come in pairs, one for the central office, a unit known as an ATU-C (Asymmetrical Transmission Unit - Central office), and one for the subscriber premises, known as an ATU-R (Asymmetrical Transmission Unit- Remote terminal).
  • ATU-C Asymmetrical Transmission Unit - Central office
  • ATU-R Asymmetrical Transmission Unit- Remote terminal
  • FIG. 1 A typical installation for ADSL and plain old telephone service (POTS) is illustrated in FIG. 1.
  • the computer system at the customer premises is represented as PC 10, and is shown connected by a local area network 12 to an ATU- R 14.
  • ATU-R is an ADSL transmission unit that contains, among other things, a DSL modem.
  • the PC 10 is also connected over a serial RS-232 cable 15 to an ordinary PSTN modem 16.
  • the ATU-R unit 14 and modem 16 convert their respective data to analog form in the applicable frequency band (200-3500 Hz for the modem and 250 kHz and 1 MHz for the ATU-R).
  • the analog signals from the ATU-R unit 14 and modem 16 are combined in a POTS splitter 18 having high and low pass filters for ADLS and POTS modem signals, respectively, and imparted onto the two wire subscriber loop 21 for transmission to the telephone company central office 20.
  • a second POTS splitter 22 having high and low pass filters is placed at the central office, which demultiplexes the ADSL and modem analog signals.
  • the modem signals are sent to a line card 24 where the signals are amplified, converted to digital form, and sent to the telephone company switch 26 for long haul delivery in the switched telephone network.
  • the ADSL signals are routed to the telephone company's ADSL modem (ATU-C 28) where they are amplified, converted to digital form and multiplexed with other xDSL data from other users at a DSL multiplexer 29 for transmission over a high speed computer network (such as the Internet) to the destination.
  • ATU-C 28 ADSL modem
  • the host computer system PC 10 can enjoy a dial-up connection via the modem 16 to destinations over the public switched telephone network, and very high speed Internet or video on demand access simultaneously via the ADSL ATU-R 14.
  • the two services coexist simultaneously with each other since they are mutually transparent.
  • the two frequency bands are separated by high-pass and low-pass filters at each end of the subscriber loop.
  • the ADSL connection does not require typical POTS signaling, such as OFF-HOOK, ON-HOOK, DTMF tones, etc., and can be running continuously while a call is made over the line 21 by the PSTN modem 16.
  • a principal object of the invention is to provide a combined xDSL modem and PSTN modem in a single hardware platform.
  • a modem is constructed with a single digital signal processor for receiving data from a host computer system.
  • the digital signal processor performs xDSL and PSTN modulation and demodulation of data signals to and from the host computer in the respective frequency bands of xDSL and PSTN transmission, i.e. in the voice band for PSTN modem data and above 20Hz for the xDSL data.
  • the modem further includes an xDSL signal channel or module and a PSTN signal channel or module, each of the signal channels connected to the digital signal processor.
  • the xDSL and PSTN signal channels also convert digital representations of xDSL and PSTN data from the DSP into analog form and supply a combined xDSL and PSTN analog signal to a telephone line interface for placement onto a subscriber telephone line.
  • the xDSL and PSTN signal channels convert analog xDSL and PSTN data received from the telephone line into digital form and supply the digital xDSL and PSTN data to the digital signal processor.
  • the PSTN signal channel or module comprises a CODEC (coder/decoder) connected to the digital signal processor for converting digital PSTN data into analog form and vice-versa, line interface circuitry connected to the CODEC for processing of analog PSTN signals for placement on the subscriber telephone line, and a low pass filter for removing frequency components of the analog PSTN signals outside of the voice band of the subscriber telephone line.
  • CODEC coder/decoder
  • line interface circuitry connected to the CODEC for processing of analog PSTN signals for placement on the subscriber telephone line
  • a low pass filter for removing frequency components of the analog PSTN signals outside of the voice band of the subscriber telephone line.
  • the xDSL signal channel or module comprises a CODEC connected to the digital signal processor for converting digital xDSL data into analog form, line interface circuitry connected to the CODEC for processing the analog xDSL signals into a form suitable for placement on the subscriber telephone line, and a band pass filter for removing frequency components of the analog xDSL signals outside of the xDSL spectral band (i.e., below 20 kHz and above 1 MHz).
  • the modem also preferably comprises an interface for connecting the digital signal processor to the host computer system, such as a Ethernet local area network interface, RS-232 port, PCI bus, or combination thereof.
  • the combined xDSL and PSTN modem is manufactured as a stand-alone unit in a single housing containing the single digital signal processor for both xDSL and PSTN data and the PSTN and xDSL signal channels, thereby providing both modem and xDSL functionality in a single DSP computing platform.
  • the modem is incorporated into a personal computer or other type of communication device, such as a network access server.
  • FIG. 1 is a diagram of a prior art system in which separate PSTN modems and ATU-R units were placed at a customer premises for connecting a computer system to the subscriber line.
  • FIG. 2 is a diagram showing the combined PSTN modem and xDSL modem in a single platform at the customer premises.
  • FIG. 3 is a detailed block diagram of the combined PSTN and xDSL modems of FIG. 2.
  • FIG. 4 is a more detailed block diagram of the DSP platform of FIG. 3.
  • FIG. 5 is a perspective view of one embodiment in which the combined PSTN and xDSL modems are manufactured as an integrated unit.
  • FIG. 6 is a perspective view of an alternative embodiment in which the combined PSTN and xDSL modems are manufactured on a printed circuit card for installation inside a personal computer, a network access server chassis, or other type of communication device.
  • FIG. 2 illustrates a high level view of a preferred embodiment of the present invention, in which the functionality of the PSTN modem and the xDSL modem is combined in a single hardware platform 30 at the customer premises.
  • the combined hardware platform 30 eliminates expensive and unnecessary duplication of hardware and data interfaces by combining the xDSL modems in the same platform as an analog PSTN modem, and uses a single DSP (Digital Signal Processor) in the PSTN modem platform for both PSTN signal modulation as well as xDSL modulation.
  • the hardware platform 30 is designed to process the 200- 4 kHz voice band signals and perform the required PSTN modem functions, such as modulation, error correction, compression, line probing etc.
  • the 20 kHz to 1MHz xDSL signals are processed by the same DSP hardware, which performs the Discrete Multi-Tone (DMT) modulation for ADSL developed by the American National Standards Institute (ANSI) or other applicable modulation technique.
  • DMT Discrete Multi-Tone
  • ANSI American National Standards Institute
  • the details of DMT modulation is known in the art and therefore a description of the algorithms is omitted.
  • PSTN modems include various modems intended for operation over the PSTN network.
  • PSTN modems treated the PSTN channel as an analog band-limited channel, making adjustments for the fact that the PSTN switches actually digitized the information for transmission through the network. This was the case for e.g., ITU Recommendation V.34 modems.
  • ITU Recommendation V.90 a new technique of utilizing the PSTN was recognized and was incorporated into ITU Recommendation V.90.
  • the telephone network routes digital signals directly from a digital data source to the client's local subscriber loop without any intermediary analog facilities, such that the only analog portion of the link from server to client is the client's local loop (plus the associated analog electronics at both ends of the loop).
  • the only CODEC in the transmission path is the one at the Telephone Company's end of the client's subscriber loop.
  • a data source can convert digital data into PCM codes, and feed it to the PSTN as 8-bit bytes (octets) at the network's clock rate of 8 kHz.
  • the PSTN's CODEC converts each byte to one of 255 analog voltage levels, which is sent over the client's subscriber loop and received by a subscriber device (i.e., a modem) at the client's location.
  • This modulation technique is referred to herein as PCM modulation.
  • the PSTN modem implementing PCM modulation is referred to herein as a PCM modem, utilizing a PCM channel.
  • the data modulated using this format and transmitted over the PCM channel is referred to as PCM data.
  • the hardware platform 30 may multiplex the data from these two formats onto one local area network interface for transmission to a host computer system, or the PSTN modem signal path may have its own separate interface to a host computer system, such as via an RS-232 port to a home personal computer.
  • the platform 30 is essentially an integrated modem comprising a single digital signal processor system 32 that receives data from a host computer system 10 via a host computer system interface 34.
  • the digital signal processor 32 performs xDSL and PSTN modulation and demodulation of signals in the respective frequency bands of xDSL and PSTN transmission.
  • These signal modulation and demodulation algorithms performed by the DSP 32 are the subject of standards promulgated by international standards bodies and well known in the art.
  • the digital signal processor 32 is connected to an xDSL signal channel or subsystem 36 and a PSTN signal channel or subsystem 38.
  • the xDSL and PSTN signal channels 36, 38 convert digital representations of xDSL and PSTN data from the DSP 32 into analog form, perform line interface processing as required, perform filtering, and then the signals from the two channels are combined in a multiplexer/splitter 40 and directed to a telephone line interface 42 (e.g., tip and ring terminals) for placement onto a subscriber telephone line 21.
  • the xDSL and PSTN signal channels 36 and 38 also convert analog xDSL and PSTN data received from said telephone line 21 into digital form and supply the digital xDSL and PSTN data to the digital signal processor 32.
  • the PSTN signal channel 38 comprises a CODEC 44 (coder/decoder) connected to the digital signal processor 32 for converting digital PSTN data samples into analog form and incoming analog PSTN data into digital form.
  • the signal channel further includes conventional line interface circuitry 46 connected to the CODEC 44 for any required processing of the outbound analog PSTN signals (such as signal amplification).
  • the channel 38 also includes a low pass filter 48 for removing frequency components of the analog PSTN signals outside of the voice band of the subscriber telephone line.
  • the CODEC 44, line interface circuitry 46 and low pass filter 48 are known in the modem art and found in the commercially available products of modem manufacturers, such as 3Com Corporation (formerly U.S. Robotics), therefore a more detailed description of these components 44, 46, 48 is omitted.
  • the xDSL signal channel 36 comprises a CODEC 50 connected to the digital signal processor 32 for converting outgoing digital xDSL data into analog form and vice-versa for incoming xDSL data.
  • the signal channel 36 also includes a line interface unit 52 connected to the CODEC 50 for processing analog xDSL signals, and a high pass filter 54 for removing frequency components of the analog xDSL signals outside of the spectral band of the xDSL signals, such as below 20 kHz and above 1MHz.
  • the line interface unit 52 includes such features as amplifiers, line drivers and line receivers that perform noise and distortion compensation in order to meet the requirements of DMT signal conversion operations and the performance specifications of the ANSI T 1.413 ETSI (Category 1-FDM) and DMT modulation standards.
  • a particularly preferred embodiment includes a local area network interface 60 such as an Ethernet interface unit (which is commercially available) for connecting the digital signal processor 32 to the host computer system 10.
  • the digital signal processor system may include a multiplexer (not shown) in channel 62 that multiplexes the host-bound PSTN data and the xDSL data together and supplies them to the Ethernet interface unit for transmission onto a local area network 12 for distribution to one or more host computers on the local area network 12.
  • the xDSL data may be transmitted between the platform and the host computer system via the local area network interface 60, while the PSTN data is transmitted via an RS-232 port 64, a PCI bus interface 66, or other suitable means.
  • a platform that provides RS-232, PCI bus, and local area network interfaces as shown presents a flexible approach to connecting to the host computer system, and hence is a preferred embodiment.
  • the DSP architecture and software running in the DSP 32 in an ADSL embodiment is shown in further detail.
  • the ADSL data is transmitted from the DSP to the host computer system via the LAN interface 60 of Figure 3. Transmit and receive data bits to and from the LAN are stored in transmit and receive queues 102 and 104, respectively.
  • the transmit data is processed by an ADSL processing software program 106, which converts the transmit data to digital ADSL transmit samples using known ADSL coding algorithms.
  • Software module 106 also contains memory 108 shared with ADSL receive program 110 for storing transitory data during the conversion process.
  • the ADSL transmit samples are stored in an ADSL signal transmit queue 112, and the samples are send to the CODEC 50 ( Figure 3) for conversion to analog form, subsequent filtering and processing circuitry for transmission over the analog phone line to the central office.
  • the digital ADSL samples from the ADSL transmit program 106 must replenish the transmit sample queue 112 before it runs dry.
  • the outbound transmit queue is emptied at a constant rate due to regular periodic CODEC digital-to- analog outputs on conductor 114 from the DSP system 32 to the ADSL CODEC 50.
  • inbound ADSL signal receive samples from the CODEC 50 ( Figure 3) are stored in an inbound receive sample queue 116.
  • a central controller or software overseer program 118 tells each software processing unit
  • the central controller is notified as indicated by 120 and tells the ADSL receive program 110 to execute, which turns the samples into bits.
  • In-bound ADSL bit data is stored in the receive bit queue 104 and sent to the LAN interface 50 for transmission to the host computer system.
  • the processing of voice band modem data from the PCI bus or serial cable through the DSP to the modem signal path of Figure 3 is essentially the same as described above.
  • the DSP system 32 has transmit and receive queues 122, 124 for data to and from the host computer, voice band transmit and receive signal conversion programs 126 and 128 for converting inbound and outbound data into digital transmit and receive modem samples, and an associated memory 130 for transitory storage of data, and voice band transmit and receive queues 132 and 134 for storing transmit and receive digital modem samples.
  • the receive queue 134 notifies the system controller program 118 when there is enough data in the queue, causing the system controller program to issue an execute command as indicated to the voice band receive program 128, which then receives the data from the queue 134, converts it using a digital modem receive algorithm and sends the data to the host-side receive bit queue 124.
  • Outbound data from the transmit bit queue 122 is processed by the voice band transmit program 126 and sent as voice band samples to the voice band transmit sample queue 132 for transmission to the PSTN CODEC 44(see Figure 3).
  • Additional modem and xDSL modem functions for effective data transmission are also performed by the DSP system 32 and/or the line interface units of Figure 3, in accordance with well known techniques. Accordingly, a detailed description of these auxiliary functions is omitted for the sake of brevity.
  • the xDSL/PSTN platform 30 of FIG. 2 and 3 may be constructed as a standalone unit and sold to the public as such, in which the host computer interface(s), digital signal processor, xDSL signal channel, PSTN signal channel and subscriber line telephone line interface are installed in a single unitary housing 80, as shown in
  • This product 80 could be marketed as a combined xDSL and PSTN modem for both home computer users and corporate customers, giving them the ability to conduct both types of data transmission simultaneously and in a mutually transparent manner in a single device.
  • the host computer interface(s), digital signal processor, xDSL signal channel, PSTN signal channel and subscriber line telephone line interface could be incorporated onto a single printed circuit card 82 as suggested by FIG. 6, with the necessary bus interfaces, for installation within the chassis of a general purpose computer, network access server (such as the Total Control Enterprise Network Hub of 3Com Corporation or competing device from other manufacturers such as Ascend and Livingston Enterprises), or other type of communications equipment.
  • the method comprises the steps of: (a) receiving the xDSL and PSTN data from the host computer system at a host computer system interface 34 in a combined xDSL and PSTN modem platform 30;

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention concerne un modem combiné xDSL et PCM possédant un seul processeur de signal numérique qui assure la modulation et la démodulation des signaux PCM et xDSL, ce qui permet d'éviter les équipements de traitement redondants, de réduire le coût et nécessite l'interconnexion d'un nombre moins important de sous-systèmes. Le processeur de signal numérique dirige les données modulées dans les voies de signalisation PCM et xDSL, dont chacune exécute une conversion entre les formes numérique et analogique, tout traitement d'interface de ligne requis et un filtrage passe-haut et passe-bas. Après le filtrage, les signaux analogiques dans les voies PCM et xDSL sont combinés et placés sur la ligne d'abonné pour être transmis vers le central la compagnie téléphonique.
PCT/US1998/021112 1997-10-07 1998-10-07 MODEMS xDSL ET RTPC COMBINES DANS UNE PLATE-FORME UNIQUE WO1999018712A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU97893/98A AU9789398A (en) 1997-10-07 1998-10-07 Combined xdsl and pstn modems in a single platform

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US94654297A 1997-10-07 1997-10-07
US08/946,542 1997-10-07
US8564898A 1998-05-27 1998-05-27
US09/085,648 1998-05-27

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Publication Number Publication Date
WO1999018712A1 true WO1999018712A1 (fr) 1999-04-15

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069847A2 (fr) * 2000-03-13 2001-09-20 Dslb It Hantro Oy Procede de transmission de donnees, equipement terminal et systeme de transmission de donnees
WO2001091507A2 (fr) * 2000-05-25 2001-11-29 Pairgain Technologies, Inc. Systeme de liaisons ascendantes et descendantes a mic sur porteur numerique universel en boucle
US6700955B1 (en) 2000-01-12 2004-03-02 Multi-Tech Systems, Inc. System and method for remote management of a DSL device
DE19933487B4 (de) * 1999-07-16 2004-05-13 Infineon Technologies Ag Breitband-Netzwerkzugangseinrichtung für Sprach- und Datenübertragung
US6842446B2 (en) 2002-04-19 2005-01-11 Sprint Communications Company L.P. Method and system for increasing data rate in wireless communications through aggregation of data sessions
US6850560B2 (en) 2000-03-13 2005-02-01 Finoc Design Consulting Oy Data transmission method, terminal equipment and data transmission system
US6996166B2 (en) * 2000-11-03 2006-02-07 Telefonaktiebolaget L M Ericsson (Publ) Apparatus and method for provision of a broadband access in a telecommunication system
EP1648152A1 (fr) * 2004-10-14 2006-04-19 Thomson Multimedia Broadband Belgium Dispositif intégré d'accès, modem associé et module séparateur
US7227933B1 (en) 2000-01-12 2007-06-05 Multi-Tech Systems, Inc. System and method for remote management of a DSL device
US7924798B1 (en) 2002-11-27 2011-04-12 Sprint Spectrum L.P. Method for transmitting data in a wireless telecommunications network using multiple data channels
DE102012105869A1 (de) * 2012-07-02 2014-01-02 Deutsche Telekom Ag Verfahren und xDSL-fähige Netzvorrichtung zur Mehrträgerübertragung von Schmalband- und Breitbandströmen über eine digitale Teilnehmeranschlussleitung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659007A2 (fr) * 1993-12-16 1995-06-21 International Business Machines Corporation Système et méthode de communication avec des dispositifs numériques et analogiques au moyen d'une interface numérique unique
DE4414554A1 (de) * 1994-04-22 1995-11-02 Triple I Gmbh Fuer Tech Kommun Verfahren und Anordnung zur Bearbeitung von Signalen in Telekommunikationsendgeräten
WO1996027241A1 (fr) * 1995-02-28 1996-09-06 Motorola Inc. Dispositif de transmission de donnees fonctionnant de maniere selective comme modem analogique, modem numerique et adaptateur de terminal
EP0772370A2 (fr) * 1995-10-30 1997-05-07 International Business Machines Corporation Adapteur de communication avec plusieurs options d'interface
EP0806852A2 (fr) * 1996-05-09 1997-11-12 Texas Instruments Incorporated Modem multimode numérique
WO1998007292A1 (fr) * 1996-08-13 1998-02-19 Advanced Micro Devices, Inc. Dispositif de communication combine analogique et numerique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0659007A2 (fr) * 1993-12-16 1995-06-21 International Business Machines Corporation Système et méthode de communication avec des dispositifs numériques et analogiques au moyen d'une interface numérique unique
DE4414554A1 (de) * 1994-04-22 1995-11-02 Triple I Gmbh Fuer Tech Kommun Verfahren und Anordnung zur Bearbeitung von Signalen in Telekommunikationsendgeräten
WO1996027241A1 (fr) * 1995-02-28 1996-09-06 Motorola Inc. Dispositif de transmission de donnees fonctionnant de maniere selective comme modem analogique, modem numerique et adaptateur de terminal
EP0772370A2 (fr) * 1995-10-30 1997-05-07 International Business Machines Corporation Adapteur de communication avec plusieurs options d'interface
EP0806852A2 (fr) * 1996-05-09 1997-11-12 Texas Instruments Incorporated Modem multimode numérique
WO1998007292A1 (fr) * 1996-08-13 1998-02-19 Advanced Micro Devices, Inc. Dispositif de communication combine analogique et numerique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GOTTLIEB A M: "A DSP-BASED RESEARCH PROTOTYPE REVERSE CHANNEL TRANSMITTER/RECEIVERFOR ADSL", IEEE TECHNICAL APPLICATIONS CONFERENCE AND WORKSHOPS AT NORTHCON '9, PORTLAND, OCT. 10 - 12, 1995, 10 October 1995 (1995-10-10), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 17 - 20, XP000558957 *
MAXWELL K: "ASYMMETRIC DIGITAL SUBSCRIBER LINE: INTERIM TECHNOLOGY FOR THE NEXT FORTY YEARS", IEEE COMMUNICATIONS MAGAZINE, vol. 34, no. 10, 1 October 1996 (1996-10-01), pages 100 - 106, XP000614169 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933487B4 (de) * 1999-07-16 2004-05-13 Infineon Technologies Ag Breitband-Netzwerkzugangseinrichtung für Sprach- und Datenübertragung
US7227933B1 (en) 2000-01-12 2007-06-05 Multi-Tech Systems, Inc. System and method for remote management of a DSL device
US6700955B1 (en) 2000-01-12 2004-03-02 Multi-Tech Systems, Inc. System and method for remote management of a DSL device
US6850560B2 (en) 2000-03-13 2005-02-01 Finoc Design Consulting Oy Data transmission method, terminal equipment and data transmission system
WO2001069847A3 (fr) * 2000-03-13 2002-01-24 Dslb It Hantro Oy Procede de transmission de donnees, equipement terminal et systeme de transmission de donnees
WO2001069847A2 (fr) * 2000-03-13 2001-09-20 Dslb It Hantro Oy Procede de transmission de donnees, equipement terminal et systeme de transmission de donnees
EP2190158A1 (fr) * 2000-03-13 2010-05-26 Hannu Heusala Procédé de transmission de données et système de transmission de données
US6785340B1 (en) 2000-05-25 2004-08-31 Adc Dsl Systems, Inc. PCM upstream and downstream system for universal digital loop carrier
WO2001091507A3 (fr) * 2000-05-25 2002-04-25 Pairgain Technologies Inc Systeme de liaisons ascendantes et descendantes a mic sur porteur numerique universel en boucle
WO2001091507A2 (fr) * 2000-05-25 2001-11-29 Pairgain Technologies, Inc. Systeme de liaisons ascendantes et descendantes a mic sur porteur numerique universel en boucle
US6996166B2 (en) * 2000-11-03 2006-02-07 Telefonaktiebolaget L M Ericsson (Publ) Apparatus and method for provision of a broadband access in a telecommunication system
US6842446B2 (en) 2002-04-19 2005-01-11 Sprint Communications Company L.P. Method and system for increasing data rate in wireless communications through aggregation of data sessions
US7924798B1 (en) 2002-11-27 2011-04-12 Sprint Spectrum L.P. Method for transmitting data in a wireless telecommunications network using multiple data channels
EP1648152A1 (fr) * 2004-10-14 2006-04-19 Thomson Multimedia Broadband Belgium Dispositif intégré d'accès, modem associé et module séparateur
WO2006040272A1 (fr) * 2004-10-14 2006-04-20 Thomson Licensing Dispositif d'acces integre, boitier de modem et module repartiteur associes
KR101178121B1 (ko) 2004-10-14 2012-08-30 톰슨 라이센싱 통합형 액세스 디바이스와 연관된 모뎀 박스 및 분할 모듈
US8315277B2 (en) * 2004-10-14 2012-11-20 Thomson Licensing Integrated access device, associated modem box and splitting module
US8660148B2 (en) 2004-10-14 2014-02-25 Thomson Licensing Integrated access device and associated modem box and splitting module
DE102012105869A1 (de) * 2012-07-02 2014-01-02 Deutsche Telekom Ag Verfahren und xDSL-fähige Netzvorrichtung zur Mehrträgerübertragung von Schmalband- und Breitbandströmen über eine digitale Teilnehmeranschlussleitung
DE102012105869B4 (de) * 2012-07-02 2015-04-16 Deutsche Telekom Ag Verfahren und xDSL-fähige Netzvorrichtung zur Mehrträgerübertragung von Schmalband- und Breitbandströmen über eine digitale Teilnehmeranschlussleitung

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