CA2217073A1 - Multimode digital modem - Google Patents

Multimode digital modem

Info

Publication number
CA2217073A1
CA2217073A1 CA002217073A CA2217073A CA2217073A1 CA 2217073 A1 CA2217073 A1 CA 2217073A1 CA 002217073 A CA002217073 A CA 002217073A CA 2217073 A CA2217073 A CA 2217073A CA 2217073 A1 CA2217073 A1 CA 2217073A1
Authority
CA
Canada
Prior art keywords
mdsl
modem
line
cap
sequence
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002217073A
Other languages
French (fr)
Other versions
CA2217073C (en
Inventor
William C. Timm
Walter Y. Chen
Gene A. Frantz
Domingo G. Garcia
Xiaolin Lu
Dennis G. Mannering
Michael O. Polley
Terence J. Riley
Donald P. Shaver
Song S. Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Texas Instruments Inc
Original Assignee
Texas Instruments Inc
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
Priority to US08/667,267 priority Critical patent/US6055268A/en
Priority to EP97303071A priority patent/EP0806852A3/en
Priority to JP9155695A priority patent/JPH1075279A/en
Application filed by Texas Instruments Inc filed Critical Texas Instruments Inc
Priority to CA002505051A priority patent/CA2505051C/en
Priority to CA002217073A priority patent/CA2217073C/en
Publication of CA2217073A1 publication Critical patent/CA2217073A1/en
Application granted granted Critical
Publication of CA2217073C publication Critical patent/CA2217073C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H04L25/4919—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes
    • H04L25/4921—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using balanced multilevel codes using quadrature encoding, e.g. carrierless amplitude-phase coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication
    • 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
    • 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
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. This modem supports multiple line codes, like DMT and CAP.
The modem uses a Digital Signal Processor (DSP), so that different existing ADSL line codes, such as Discrete MultiTone (DMT) and Carrierless AM/PM (CAP), can be implemented on the same hardware platform. The modem negotiates in real-time, for a desired line transmission rate to accommodate line condition and service-cost requirement.
The line code and rate negotiation process may be implemented at the beginning of each communication session through the exchange of tones between the modems. A four-step MDSL modem initialization process is provided for line code and rate compatibility.
A new synchronization startup procedure for CAP based MDSL modems is provided. The handshake protocol and receiver algorithm allow reliable modem synchronization over severely amplitude distorted channels such as standard telephone twisted-pair wire. The algorithm makes use of a short length sequence to train a synchronizing equalizer at the receiver. After training to this sequence, a matched filter or correlator is used to detect the inverted sync sequence. The detection of the inverted sequence signals the start of the normal reference training of the CAP demodulation equalizers.
The MDSL line connection management process provides a simple, efficient, and flexible interface to manage the line connection between MDSL-C (MDSL in Central Office site) and MDSL-R (MDSL in resident site) in the telecommunication Wide Area Networking environment. An internal state machine in an MDSL modem records and monitors the line status and notifies the state change to the other MDSL and also the host processor. The protocol used for exchanging line connection management messages is a simplified Link Control Protocol (LCP) for MDSL.
CA002217073A 1996-05-09 1997-10-01 Multimode digital modem Expired - Fee Related CA2217073C (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US08/667,267 US6055268A (en) 1996-05-09 1996-06-20 Multimode digital modem
EP97303071A EP0806852A3 (en) 1996-05-09 1997-05-06 A multimode digital modem
JP9155695A JPH1075279A (en) 1996-05-09 1997-05-09 Method and modem for demodulating digital subscriber line modem signal
CA002505051A CA2505051C (en) 1997-10-01 1997-10-01 Fast equalizer training and frame synchronization algorithms for discrete multi-tone (dmt) system
CA002217073A CA2217073C (en) 1996-05-09 1997-10-01 Multimode digital modem

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US64502096A 1996-05-09 1996-05-09
US08/667,267 US6055268A (en) 1996-05-09 1996-06-20 Multimode digital modem
CA002217073A CA2217073C (en) 1996-05-09 1997-10-01 Multimode digital modem

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002505051A Division CA2505051C (en) 1997-10-01 1997-10-01 Fast equalizer training and frame synchronization algorithms for discrete multi-tone (dmt) system

Publications (2)

Publication Number Publication Date
CA2217073A1 true CA2217073A1 (en) 1999-04-01
CA2217073C CA2217073C (en) 2005-08-02

Family

ID=27170470

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002217073A Expired - Fee Related CA2217073C (en) 1996-05-09 1997-10-01 Multimode digital modem

Country Status (4)

Country Link
US (1) US6055268A (en)
EP (1) EP0806852A3 (en)
JP (1) JPH1075279A (en)
CA (1) CA2217073C (en)

Families Citing this family (191)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6334219B1 (en) 1994-09-26 2001-12-25 Adc Telecommunications Inc. Channel selection for a hybrid fiber coax network
US7280564B1 (en) 1995-02-06 2007-10-09 Adc Telecommunications, Inc. Synchronization techniques in multipoint-to-point communication using orthgonal frequency division multiplexing
USRE42236E1 (en) 1995-02-06 2011-03-22 Adc Telecommunications, Inc. Multiuse subcarriers in multipoint-to-point communication using orthogonal frequency division multiplexing
EP0828363A3 (en) * 1996-09-04 2000-04-05 Texas Instruments Incorporated Multicode modem with a plurality of analogue front ends
US6370156B2 (en) * 1997-01-31 2002-04-09 Alcatel Modulation/demodulation of a pilot carrier, means and method to perform the modulation/demodulation
US6470046B1 (en) * 1997-02-26 2002-10-22 Paradyne Corporation Apparatus and method for a combined DSL and voice system
US6064692A (en) * 1997-06-20 2000-05-16 Amati Communications Corporation Protocol for transceiver initialization
US6065060A (en) * 1997-06-30 2000-05-16 Integrated Telecom Express Modular multiplicative data rate modem and method of operation
US6252900B1 (en) 1997-06-30 2001-06-26 Integrated Telecom Express, Inc. Forward compatible and expandable high speed communications system and method of operation
US6092122A (en) * 1997-06-30 2000-07-18 Integrated Telecom Express xDSL DMT modem using sub-channel selection to achieve scaleable data rate based on available signal processing resources
US6128335A (en) * 1997-06-30 2000-10-03 Integrated Telecom Express Software rate adaptable modem with forward compatible and expandable functionality and method of operation
US6219695B1 (en) * 1997-09-16 2001-04-17 Texas Instruments Incorporated Circuits, systems, and methods for communicating computer video output to a remote location
US6219378B1 (en) 1997-09-17 2001-04-17 Texas Instruments Incorporated Digital subscriber line modem initialization
AU9789398A (en) * 1997-10-07 1999-04-27 3Com Corporation Combined xdsl and pstn modems in a single platform
US6434620B1 (en) * 1998-08-27 2002-08-13 Alacritech, Inc. TCP/IP offload network interface device
US6151335A (en) * 1997-12-02 2000-11-21 Conexant Systems, Inc. Modulation switching for DSL signal transmission
JPH11234175A (en) * 1997-12-05 1999-08-27 Alcatel Cit Link interface for interconnecting two units inside communications system
US7184428B1 (en) * 1997-12-31 2007-02-27 At&T Corp. Facility management platform for a hybrid coaxial/twisted pair local loop network service architecture
US6363079B1 (en) * 1997-12-31 2002-03-26 At&T Corp. Multifunction interface facility connecting wideband multiple access subscriber loops with various networks
US6735245B1 (en) 1998-01-09 2004-05-11 Panasonic Communications Co., Ltd. Activation of multiple XDSL modems with channel probe
DE19802600A1 (en) 1998-01-23 1999-08-05 Siemens Ag Process for digital data transmission with variable bandwidth
US20040160906A1 (en) 2002-06-21 2004-08-19 Aware, Inc. Multicarrier transmission system with low power sleep mode and rapid-on capability
US6327314B1 (en) * 1998-04-01 2001-12-04 At&T Corp. Method and apparatus for channel estimation for multicarrier systems
US6873652B1 (en) * 1998-04-01 2005-03-29 Panasonic Communications Co., Ltd. Activation of multiple xDSL modems with implicit channel probe
US6243369B1 (en) * 1998-05-06 2001-06-05 Terayon Communication Systems, Inc. Apparatus and method for synchronizing an SCDMA upstream or any other type upstream to an MCNS downstream or any other type downstream with a different clock rate than the upstream
WO1999065218A1 (en) * 1998-06-09 1999-12-16 Advanced Micro Devices, Inc. Method and apparatus for scaling modem transfer capacity based on resource availability
US6988274B2 (en) * 1998-06-12 2006-01-17 Microsoft Corporation Method, system, and computer program product for representing and connecting an underlying connection-oriented device in a known format
EP0967777A3 (en) * 1998-06-26 2000-01-05 Siemens Aktiengesellschaft Method for the transmission of information in the subscriber loop
US6219377B1 (en) 1998-06-29 2001-04-17 Legerity, Inc. Method and apparatus for generating tones in a multi-tone modem
WO2000001136A1 (en) * 1998-06-29 2000-01-06 Advanced Micro Devices, Inc. Method and apparatus for scaling modem transfer capacity
US6304594B1 (en) * 1998-07-27 2001-10-16 General Dynamics Government Systems Corporation Interference detection and avoidance technique
US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
US6567981B1 (en) * 1998-08-03 2003-05-20 Elysium Broadband Inc. Audio/video signal redistribution system
US6711121B1 (en) * 1998-10-09 2004-03-23 At&T Corp. Orthogonal code division multiplexing for twisted pair channels
US7116707B1 (en) * 1998-11-05 2006-10-03 Cisco Technology, Inc. Modem failover without call loss
US6804251B1 (en) * 1998-11-12 2004-10-12 Broadcom Corporation System and method for multiplexing data from multiple sources
DE19858106B4 (en) 1998-12-16 2014-09-25 Telefonaktiebolaget Lm Ericsson (Publ) A receiver and method for preventing intersymbol interference in a high-speed transmission system
US6950459B1 (en) * 1999-01-08 2005-09-27 Panasonic Communications Co., Ltd. Activation of multiple xDSL modems with half duplex and full duplex procedures
US6345072B1 (en) * 1999-02-22 2002-02-05 Integrated Telecom Express, Inc. Universal DSL link interface between a DSL digital controller and a DSL codec
US6724706B1 (en) * 1999-02-26 2004-04-20 Matsushita Electric Industrial Co., Ltd. Digital adaptive equalizer for different quality signals
US6751254B1 (en) * 1999-05-05 2004-06-15 Panasonic Communications Co., Ltd. Activation of multiple xDSL modems with power control measurement
US6694470B1 (en) 1999-05-21 2004-02-17 Panasonic Communications Co., Ltd. Retransmission procedure and apparatus for handshaking protocol
US7697507B2 (en) * 1999-05-27 2010-04-13 Infineon Technologies Ag Ethernet transport over a telephone line
US7054376B1 (en) * 1999-05-27 2006-05-30 Infineon Technologies Ag High data rate ethernet transport facility over digital subscriber lines
CA2376137A1 (en) * 1999-05-28 2000-12-07 Richard Keith Lewis Highly integrated adsl linecard
EP1058419A3 (en) * 1999-05-31 2001-09-12 Canon Europa N.V. Updating of processing peripherals on a communication network
US6795492B1 (en) 1999-06-28 2004-09-21 Harris Corporation Configurable exciter
US6956826B1 (en) 1999-07-07 2005-10-18 Serconet Ltd. Local area network for distributing data communication, sensing and control signals
US6690677B1 (en) 1999-07-20 2004-02-10 Serconet Ltd. Network for telephony and data communication
US6498807B1 (en) 1999-07-21 2002-12-24 Legerity, Inc. Method and apparatus for transmitting data from a plurality of users in a multi-tone modem communications system
FR2797131B1 (en) * 1999-07-29 2004-02-20 Kurtosis Ingenierie INFORMATION DISTRIBUTION PROCESS
DE19935997A1 (en) * 1999-07-30 2001-03-01 Siemens Ag Method for optimizing data transmission over lines
WO2001017314A2 (en) * 1999-08-31 2001-03-08 Broadcom Corporation Method for the suppression and expansion of packet header information in cable modem and cable modem termination system devices
US6788707B1 (en) 1999-08-31 2004-09-07 Broadcom Corporation Method for the suppression and expansion of packet header information in cable modem and cable modem termination system devices
DE19945273B4 (en) * 1999-09-22 2013-04-18 Ipcom Gmbh & Co. Kg Method for measuring at least one property of a transmission channel and transmitting / receiving stations for carrying out the method
US6567491B1 (en) * 1999-10-14 2003-05-20 Tropian, Inc. High efficiency line driver for high crest-factor signals such as DMT/ADSL signals
US6404861B1 (en) 1999-10-25 2002-06-11 E-Cell Technologies DSL modem with management capability
US6940807B1 (en) 1999-10-26 2005-09-06 Velocity Communication, Inc. Method and apparatus for a X-DSL communication processor
US7028063B1 (en) * 1999-10-26 2006-04-11 Velocity Communication, Inc. Method and apparatus for a DFT/IDFT engine supporting multiple X-DSL protocols
US7333495B2 (en) * 1999-10-27 2008-02-19 Broadcom Corporation Method for scheduling upstream communications
US6993007B2 (en) * 1999-10-27 2006-01-31 Broadcom Corporation System and method for suppressing silence in voice traffic over an asynchronous communication medium
US6999414B2 (en) * 1999-10-27 2006-02-14 Broadcom Corporation System and method for combining requests for data bandwidth by a data provider for transmission of data over an asynchronous communication medium
US7123875B1 (en) * 1999-11-04 2006-10-17 Xm Satellite Radio, Inc. System and method for multipoint distribution of satellite digital audio radio service
US6570915B1 (en) * 1999-11-17 2003-05-27 Conexant Systems, Inc. DSL auto baud
WO2001037534A2 (en) * 1999-11-17 2001-05-25 Conexant Systems, Inc. Automatic data rate selection in dsl modems
US6535551B1 (en) 1999-11-17 2003-03-18 Conexant Systems, Inc. DSL post-synchronization auto baud
US6546046B1 (en) 1999-11-17 2003-04-08 Conexant Systems, Inc. DSL pre-synchronization auto baud
US6873653B1 (en) * 1999-12-17 2005-03-29 Ikanos Communication, Inc. Method and apparatus for pre-distortion of an X-DSL line driver
US6714589B1 (en) * 2000-01-04 2004-03-30 Legerity, Inc. Communication device with primitive synchronization signal
US7145943B2 (en) 2000-01-25 2006-12-05 Sbc Knowledge Ventures, L.P. XDSL system with improved impedance circuitry
US7106854B2 (en) * 2000-01-25 2006-09-12 Sbc Knowledge Ventures, L.P. XDSL system having selectable hybrid circuitry
US6959036B1 (en) * 2000-02-02 2005-10-25 Ikanos Communications Inc. Method and apparatus for an X-DSL modem supporting multiple X-DSL line codes
WO2001061924A2 (en) * 2000-02-15 2001-08-23 Broadcom Corporation Cable modem system and method for specialized data transfer
AU2000226869A1 (en) * 2000-02-21 2001-09-03 Surf Communication Solutions, Ltd. Adaptive echo canceling
US6549616B1 (en) 2000-03-20 2003-04-15 Serconet Ltd. Telephone outlet for implementing a local area network over telephone lines and a local area network using such outlets
CA2303631A1 (en) * 2000-03-31 2001-09-30 Catena Networks Canada Inc. A system and method for programmable spectrum management
IL135744A (en) 2000-04-18 2008-08-07 Mosaid Technologies Inc Telephone communication system over a single telephone line
US6842459B1 (en) 2000-04-19 2005-01-11 Serconet Ltd. Network combining wired and non-wired segments
US6850618B1 (en) 2000-05-15 2005-02-01 Centillium Communications, Inc. Central office interface techniques for digital subscriber lines
KR20030007689A (en) 2000-05-23 2003-01-23 어웨어, 인크. A Multimode Multicarrier Modem System And Method of Communication over The Same
US7076010B1 (en) 2000-06-06 2006-07-11 Ikanos Communication, Inc. Method and apparatus for time domain equalization in an XDSL modem
US6704351B1 (en) 2000-06-16 2004-03-09 Cisco Technology, Inc. Method and system for training a modem
AU2000259093A1 (en) * 2000-06-30 2002-01-14 Harris Corporation Configurable exciter for information transmission systems
US20060129863A1 (en) * 2000-07-09 2006-06-15 Peter Kouropoulos Personal computer protection device
EP1179954A3 (en) * 2000-07-31 2002-04-10 Texas Instruments Incorporated Digital subscriber line modem with automated line connection
US6977911B1 (en) * 2000-07-31 2005-12-20 Cisco Technology, Inc. Scalable voice over IP system configured for dynamically switching codecs during a call
GB0020624D0 (en) 2000-08-21 2000-10-11 Element 14 Inc Multi band DMT receiver
US20020034220A1 (en) * 2000-09-21 2002-03-21 Tom Duxbury Apparatus and method for digital subscriber line signal communications
WO2002028045A1 (en) * 2000-09-29 2002-04-04 Siemens Aktiengesellschaft Modulation method for a multi-carrier process with pre-emphasis
US7451235B2 (en) 2000-10-11 2008-11-11 Broadcom Corporation Dynamic delta encoding for cable modem header suppression
US6649567B2 (en) 2001-10-11 2003-11-18 Isp Investments Inc. Controlled release microbiocide for porous surfaces
US6853681B1 (en) * 2000-11-28 2005-02-08 Telefonaktiebolaget L M Ericsson (Publ) Using different channel models for different training sequences
DE10062762A1 (en) 2000-12-13 2002-08-22 Siemens Ag Arrangement and method for data transmission of digital transmission data
US6839792B2 (en) * 2000-12-15 2005-01-04 Innovative Concepts, Inc. Data modem
DE10100607A1 (en) * 2001-01-09 2002-07-25 Siemens Ag Procedure for bilateral line qualification and monitoring of xDSL lines
FR2820908B1 (en) * 2001-02-15 2004-06-25 Sagem ADAPTIVE MODEM HAVING A DIGITAL SYMBOL SIGNAL RECEPTION CHAIN
US20020112108A1 (en) * 2001-02-15 2002-08-15 Edward Shea Arrangement of circuit components for interfacing to a network
US7769047B2 (en) * 2001-02-15 2010-08-03 Broadcom Corporation Methods for specialized data transfer in a wireless communication system
US6829246B2 (en) 2001-03-23 2004-12-07 Rad Data Communications Ltd. System and method for extending the range of xDSL services
US7260067B2 (en) * 2001-05-22 2007-08-21 Agere Systems Inc. Spectrum and bin reassignment protocol for ADSL
US20090031419A1 (en) 2001-05-24 2009-01-29 Indra Laksono Multimedia system and server and methods for use therewith
US8291457B2 (en) 2001-05-24 2012-10-16 Vixs Systems, Inc. Channel selection in a multimedia system
IL144158A (en) 2001-07-05 2011-06-30 Mosaid Technologies Inc Outlet for connecting an analog telephone set to a digital data network carrying voice signals in digital form
EP1276249A1 (en) * 2001-07-13 2003-01-15 Reinhard Hecht Apparatus for improving the transmission characteristics of a bundle of electrical data lines and data transmission system
US7007296B2 (en) * 2001-08-29 2006-02-28 Terayon Communications, Inc. Active cable modem outside customer premises servicing multiple customer premises
US7207008B1 (en) * 2001-09-12 2007-04-17 Bellsouth Intellectual Property Corp. Method, system, apparatus, and computer-readable medium for interactive notification of events
EP1298907B1 (en) * 2001-09-27 2005-08-17 Alcatel Modem and method for connecting modems in parallel to a network
US7020155B2 (en) * 2001-09-28 2006-03-28 Silicon Integrated Systems, Corp. Collision detection method and apparatus for multiple access communication system
US7181206B2 (en) * 2001-10-11 2007-02-20 Lyndale Trading Company Ltd. Broadband communication platform and methods of network operation
US7218681B2 (en) * 2001-10-11 2007-05-15 Agere Systems Inc. Method and apparatus for cross-talk mitigation through joint multiuser adaptive pre-coding
US7088791B2 (en) 2001-10-19 2006-08-08 Texas Instruments Incorporated Systems and methods for improving FFT signal-to-noise ratio by identifying stage without bit growth
US7023877B1 (en) * 2001-10-31 2006-04-04 Godigital Networks Corporation Small form factor digital voice multiplexer with multiple DSL outputs
US7286557B2 (en) * 2001-11-16 2007-10-23 Intel Corporation Interface and related methods for rate pacing in an ethernet architecture
US7433971B2 (en) * 2001-11-16 2008-10-07 Intel Corporation Interface and related methods for dynamic channelization in an ethernet architecture
US6793971B2 (en) * 2001-12-03 2004-09-21 Cardinal Ig Company Methods and devices for manufacturing insulating glass units
EP1324584A1 (en) * 2001-12-13 2003-07-02 Alcatel Modem system and modems with tunable analog filters
US20030202612A1 (en) * 2001-12-18 2003-10-30 Bijit Halder Method and system for rate enhanced SHDSL
US6952430B2 (en) * 2001-12-31 2005-10-04 Globespanvirata Incorporated System and method for interfacing a data link protocol engine and a physical layer
EP1326359A1 (en) * 2002-01-08 2003-07-09 Alcatel Adaptive bit rate vocoder for IP telecommunications
US7146391B2 (en) * 2002-01-24 2006-12-05 Broadcom Corporation Method and system for implementing SLICE instructions
US7406028B2 (en) * 2002-06-05 2008-07-29 Texas Instruments Incorporated Memory-efficient ADSL transmission in the presence of TCM-ISDN interferers
US20040022322A1 (en) * 2002-07-19 2004-02-05 Meetrix Corporation Assigning prioritization during encode of independently compressed objects
US20040019895A1 (en) * 2002-07-29 2004-01-29 Intel Corporation Dynamic communication tuning apparatus, systems, and methods
US20040096008A1 (en) * 2002-08-01 2004-05-20 Aware, Inc. Multi-tap frequency domain equalization with decision feedback and trellis decoding
US20040032876A1 (en) * 2002-08-19 2004-02-19 Ajay Garg Selection of transmission channels
IL152824A (en) 2002-11-13 2012-05-31 Mosaid Technologies Inc Addressable outlet and a network using same
US7620154B2 (en) * 2002-12-23 2009-11-17 Cambron G Keith Equivalent working length determinative system for digital subscriber line circuits
IL154234A (en) 2003-01-30 2010-12-30 Mosaid Technologies Inc Method and system for providing dc power on local telephone lines
IL154921A (en) 2003-03-13 2011-02-28 Mosaid Technologies Inc Telephone system having multiple distinct sources and accessories therefor
US7359450B1 (en) 2003-04-04 2008-04-15 Nucomm, Inc. Digital transmission of broadcast signals, including HDTV signals, over a microwave link
EP1475914B1 (en) * 2003-05-05 2006-03-22 Alcatel Network element for use in an optical communication network, in particular a DWDM communication network
US7239676B2 (en) * 2003-06-04 2007-07-03 Honeywell Federal Manufacturing & Technologies, Llc Method of differential-phase/absolute-amplitude QAM
DE60315622T2 (en) * 2003-07-03 2008-06-05 Alcatel Lucent Method and device for unilateral testing of a line
US7447261B2 (en) * 2003-07-08 2008-11-04 Conexant Systems, Inc. Adaptive frequency equalizer
IL157787A (en) 2003-09-07 2010-12-30 Mosaid Technologies Inc Modular outlet for data communications network
US7310807B2 (en) 2003-10-29 2007-12-18 Sbc Knowledge Ventures, L.P. System and method for local video distribution
US7272209B2 (en) * 2004-01-20 2007-09-18 Sbc Knowledge Ventures, L.P. Automated DSL performance adjustment
US7356475B2 (en) * 2004-01-05 2008-04-08 Sbc Knowledge Ventures, L.P. System and method for providing access to an interactive service offering
IL159838A0 (en) 2004-01-13 2004-06-20 Yehuda Binder Information device
US7362713B2 (en) 2004-01-20 2008-04-22 Sbc Knowledge Ventures, Lp. System and method for accessing digital subscriber line data
US20060285496A1 (en) * 2004-01-28 2006-12-21 Sbc Knowledge Ventures, L.P. Digital subscriber line user capacity estimation
US7126914B2 (en) * 2004-01-28 2006-10-24 Sbc Knowledge Ventures, Lp Digital subscriber line user capacity estimation
US7123584B2 (en) * 2004-01-28 2006-10-17 Sbc Knowledge Ventures, L.P. Digital subscriber line user capacity estimation
US7342920B2 (en) * 2004-01-28 2008-03-11 Sbc Knowledge Ventures, L.P. Voice over internet protocol (VoIP) telephone apparatus and communications systems for carrying VoIP traffic
US7876775B2 (en) * 2004-02-12 2011-01-25 At&T Intellectual Property I, L.P. Connection management for data networks
IL160417A (en) 2004-02-16 2011-04-28 Mosaid Technologies Inc Outlet add-on module
US7359444B1 (en) * 2004-03-15 2008-04-15 Ikanos Communications, Inc. Method and apparatus for extending the frequency range of multi-tone modems
US7570599B2 (en) * 2004-04-21 2009-08-04 At&T Intellectual Property I, Llp. Adaptively applying a target noise margin to a digital subscriber line (DSL) loop for DSL data rate establishment
TWI276888B (en) * 2004-04-22 2007-03-21 Novatek Microelectronics Corp Data transferring method
US7388906B2 (en) * 2004-05-03 2008-06-17 Sbc Knowledge Ventures, L.P. Method for detecting bridged taps on telephony cable
US8904458B2 (en) 2004-07-29 2014-12-02 At&T Intellectual Property I, L.P. System and method for pre-caching a first portion of a video file on a set-top box
US8584257B2 (en) 2004-08-10 2013-11-12 At&T Intellectual Property I, L.P. Method and interface for video content acquisition security on a set-top box
US8086261B2 (en) * 2004-10-07 2011-12-27 At&T Intellectual Property I, L.P. System and method for providing digital network access and digital broadcast services using combined channels on a single physical medium to the customer premises
US20060174279A1 (en) * 2004-11-19 2006-08-03 Sbc Knowledge Ventures, L.P. System and method for managing television tuners
US8434116B2 (en) 2004-12-01 2013-04-30 At&T Intellectual Property I, L.P. Device, system, and method for managing television tuners
US7716714B2 (en) 2004-12-01 2010-05-11 At&T Intellectual Property I, L.P. System and method for recording television content at a set top box
US7474359B2 (en) 2004-12-06 2009-01-06 At&T Intellectual Properties I, L.P. System and method of displaying a video stream
US7436346B2 (en) 2005-01-20 2008-10-14 At&T Intellectual Property I, L.P. System, method and interface for controlling multiple electronic devices of a home entertainment system via a single control device
US7307574B2 (en) 2005-02-02 2007-12-11 Sbc Knowledge Ventures, Lp Remote control, apparatus, system and methods of using the same
US8214859B2 (en) 2005-02-14 2012-07-03 At&T Intellectual Property I, L.P. Automatic switching between high definition and standard definition IP television signals
US20060236343A1 (en) * 2005-04-14 2006-10-19 Sbc Knowledge Ventures, Lp System and method of locating and providing video content via an IPTV network
US8054849B2 (en) 2005-05-27 2011-11-08 At&T Intellectual Property I, L.P. System and method of managing video content streams
US7558213B2 (en) * 2005-06-15 2009-07-07 AT&T Intellectual Property I, LLP Methods and apparatus to determine digital subscriber line configuration parameters
US8893199B2 (en) 2005-06-22 2014-11-18 At&T Intellectual Property I, L.P. System and method of managing video content delivery
US7908627B2 (en) 2005-06-22 2011-03-15 At&T Intellectual Property I, L.P. System and method to provide a unified video signal for diverse receiving platforms
US8365218B2 (en) 2005-06-24 2013-01-29 At&T Intellectual Property I, L.P. Networked television and method thereof
US8635659B2 (en) 2005-06-24 2014-01-21 At&T Intellectual Property I, L.P. Audio receiver modular card and method thereof
US8282476B2 (en) 2005-06-24 2012-10-09 At&T Intellectual Property I, L.P. Multimedia-based video game distribution
US8190688B2 (en) 2005-07-11 2012-05-29 At&T Intellectual Property I, Lp System and method of transmitting photographs from a set top box
TWI273423B (en) * 2005-07-15 2007-02-11 Via Tech Inc Computer system with multi-port bridge and an operating method of the same
US7873102B2 (en) 2005-07-27 2011-01-18 At&T Intellectual Property I, Lp Video quality testing by encoding aggregated clips
CN100579146C (en) * 2005-09-02 2010-01-06 深圳市东进通讯技术股份有限公司 Module configuration managing method in compound telecommunication platform
US20070283400A1 (en) * 2006-05-31 2007-12-06 Minkyu Lee Method and apparatus for performing real-time on-line video quality monitoring for digital cable and IPTV services
US20070283401A1 (en) * 2006-05-31 2007-12-06 Minkyu Lee Method for real-time identification and diagnosis of video network problems for digital cable and IPTV service providers
US20070294109A1 (en) * 2006-06-20 2007-12-20 Costello John B Method and system for creation of an integrated medical record via a communications computer network
KR101295576B1 (en) * 2006-06-22 2013-08-09 엘지전자 주식회사 data transfer method using phase-shift based precoding and transmitter implementing the same
US20080056338A1 (en) * 2006-08-28 2008-03-06 David Stanley Yaney Power Line Communication Device and Method with Frequency Shifted Modem
US20120182832A1 (en) * 2006-09-29 2012-07-19 INOVA, Ltd. Seismic data acquisition systems and method utilizing a wireline repeater unit
CN101193106B (en) * 2006-11-17 2011-09-28 鸿富锦精密工业（深圳）有限公司 Modem and its certificate selection method
US7738890B1 (en) * 2007-05-09 2010-06-15 Northrop Grumman Systems Corporation Dynamic spectrum utilization techniques and methods
JP4661907B2 (en) * 2008-05-30 2011-03-30 ソニー株式会社 Information processing system, information processing apparatus, information processing method, and program
US8730798B2 (en) * 2009-05-05 2014-05-20 Broadcom Corporation Transmitter channel throughput in an information network
JP5644375B2 (en) 2010-10-28 2014-12-24 富士通株式会社 Optical transmission device and optical transmission system
EP2536034B1 (en) * 2011-06-14 2014-03-26 Alcatel Lucent Point-to-multi-point transmission over a wired loop plant
CN103457633B (en) * 2012-08-03 2015-03-11 万高(杭州)科技有限公司 Echo noise elimination full mixed line interface
CN103427875B (en) * 2012-08-03 2015-05-27 万高(杭州)科技有限公司 Analog front end system of coaxial cable broadband access
TWI517639B (en) * 2013-04-10 2016-01-11 瑞昱半導體股份有限公司 Pre-distortion mechanism for transmit path non-linearity in xdsl afe
EP3142308A4 (en) * 2014-05-08 2018-01-03 Nec Corporation Communication device, communication system, communication method, and storage medium storing program for communication
US11095047B2 (en) * 2016-05-26 2021-08-17 Arthur Ray DeLeon Multiple wideband or broadband antennas
CA3228450A1 (en) 2018-01-23 2019-08-01 Cable Television Laboratories, Inc. Systems and methods for a universal data link with demodulation and modulation only processing at intermediate nodes
US11271607B2 (en) 2019-11-06 2022-03-08 Rohde & Schwarz Gmbh & Co. Kg Test system and method for testing a transmission path of a cable connection between a first and a second position

Family Cites Families (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US31253A (en) * 1861-01-29 Machine
US3875515A (en) * 1973-06-19 1975-04-01 Rixon Automatic equalizer with decision directed feedback
US4087654A (en) * 1975-11-28 1978-05-02 Bell Telephone Laboratories, Incorporated Echo canceller for two-wire full duplex data transmission
USRE31253E (en) 1976-09-07 1983-05-24 Bell Telephone Laboratories, Incorporated Echo cancellation in two-wire, two-way data transmission systems
US4247940A (en) * 1979-10-15 1981-01-27 Bell Telephone Laboratories, Incorporated Equalizer for complex data signals
US4464545A (en) * 1981-07-13 1984-08-07 Bell Telephone Laboratories, Incorporated Echo canceller
US4489416A (en) * 1983-03-18 1984-12-18 Rixon, Inc. Equalization system for modems in a polled arrangement
NO853772L (en) * 1984-11-02 1986-05-05 Universal Data Systems Inc PROCEDURE FOR ESTABLISHING A COMMUNICATION CHANNEL, MODEM COMMUNICATION SYSTEM AND MICROPROCESSORED MODEM.
US4682358A (en) * 1984-12-04 1987-07-21 American Telephone And Telegraph Company Echo canceller
US4757495A (en) * 1986-03-05 1988-07-12 Telebit Corporation Speech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels
US4800573A (en) * 1987-11-19 1989-01-24 American Telephone And Telegraph Company Equalization arrangement
US4924492A (en) * 1988-03-22 1990-05-08 American Telephone And Telegraph Company Method and apparatus for wideband transmission of digital signals between, for example, a telephone central office and customer premises
US4931250A (en) * 1988-05-12 1990-06-05 Codex Corporation Multimode modem
US5200994A (en) * 1988-08-12 1993-04-06 Kabushiki Kaisha Toshiba Communication terminal apparatus and control method with party identification features
US4995057A (en) * 1988-11-02 1991-02-19 At&T Bell Laboratories Technique for achieving the theoretical coding gain of digital signals incorporating error correction
US5008903A (en) * 1989-05-25 1991-04-16 A.T. & T. Paradyne Adaptive transmit pre-emphasis for digital modem computed from noise spectrum
US5052000A (en) * 1989-06-09 1991-09-24 At&T Bell Laboratories Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correction
CA2050892A1 (en) * 1989-06-26 1990-12-27 Robert J. Schwendeman Receiver with variable predetection bandwidth based on expected data rate
US5251328A (en) * 1990-12-20 1993-10-05 At&T Bell Laboratories Predistortion technique for communications systems
US5579535A (en) * 1991-07-01 1996-11-26 Motorola, Inc. Personal communication system providing supplemental information mode
US5323444A (en) * 1991-08-16 1994-06-21 U S West Advanced Technologies, Inc. Emergency call system with call capacity/last chance routing feature
US5285474A (en) * 1992-06-12 1994-02-08 The Board Of Trustees Of The Leland Stanford, Junior University Method for equalizing a multicarrier signal in a multicarrier communication system
US5388150A (en) * 1992-07-28 1995-02-07 Schneyer; Robin Automatic incoming telephone call identification and disposition system
US5369682A (en) * 1992-08-17 1994-11-29 Glenayre Electronics, Inc. Digital simulcast transmission system
JP3185413B2 (en) * 1992-11-25 2001-07-09 ソニー株式会社 Orthogonal transform operation and inverse orthogonal transform operation method and apparatus, digital signal encoding and / or decoding apparatus
US5317596A (en) * 1992-12-01 1994-05-31 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for echo cancellation with discrete multitone modulation
US5371734A (en) * 1993-01-29 1994-12-06 Digital Ocean, Inc. Medium access control protocol for wireless network
SE516173C2 (en) * 1993-02-16 2001-11-26 Ericsson Telefon Ab L M Device for telecommunications
FR2703199B1 (en) * 1993-03-26 1995-06-02 Matra Communication Radio transmission method using repeating spectrum inverting stations.
US5384777A (en) * 1993-04-19 1995-01-24 International Business Machines Corporation Adaptive medium access control scheme for wireless LAN
US5479447A (en) * 1993-05-03 1995-12-26 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
JPH0775099A (en) * 1993-05-07 1995-03-17 Philips Electron Nv Transmission method, transmitter and receiver for transmitting multiplex orthogonal-amplitude-modulation type television
CA2116255C (en) * 1993-05-27 2000-03-07 Richard Thomas Flanagan Predistortion technique for communications systems
US5436930A (en) * 1993-06-14 1995-07-25 At&T Corp. Simultaneous analog and digital communications with a selection of different signal point constellations based on signal energy
US6031867A (en) * 1993-07-02 2000-02-29 Multi-Tech Systems, Inc. Modem with firmware upgrade feature
US5400322A (en) * 1993-08-20 1995-03-21 Amati Communications Corp. Updating of bit allocations in a multicarrier modulation transmission system
US5475691A (en) * 1993-11-15 1995-12-12 At&T Corp. Voice activated date rate change in simultaneous voice and data transmission
US5475735A (en) * 1993-12-02 1995-12-12 Motorola, Inc. Method of providing wireless local loop operation with local mobility for a subscribed unit
WO1995017052A1 (en) * 1993-12-15 1995-06-22 Ntt Mobile Communications Network Inc. Adaptive equalizer
CA2440662A1 (en) * 1994-06-02 1995-12-14 Krista S. Jacobsen Method and apparatus for coordinating multi-point to point communications in a multi-tone data transmission system
US5461640A (en) * 1994-06-03 1995-10-24 Texas Instruments Incorporated Method and system for optimizing an equalizer in a data transmission system
US5588051A (en) * 1994-10-05 1996-12-24 Lucent Technologies Inc. Method for dynamically provisioning telephone service
US5592470A (en) * 1994-12-21 1997-01-07 At&T Broadband wireless system and network architecture providing broadband/narrowband service with optimal static and dynamic bandwidth/channel allocation
US5544223A (en) * 1995-01-31 1996-08-06 Qualcomm Incorporated Method and apparatus for paging a concentrated subscriber system for wireless local loop
US5710981A (en) * 1995-05-23 1998-01-20 Ericsson Inc. Portable radio power control device and method using incrementally degraded received signals
US5812786A (en) * 1995-06-21 1998-09-22 Bell Atlantic Network Services, Inc. Variable rate and variable mode transmission system

Also Published As

Publication number Publication date
EP0806852A3 (en) 2000-04-12
US6055268A (en) 2000-04-25
EP0806852A2 (en) 1997-11-12
JPH1075279A (en) 1998-03-17
CA2217073C (en) 2005-08-02

Similar Documents

Publication Publication Date Title
CA2217073A1 (en) Multimode digital modem
TW361024B (en) Split modem
CA2301546C (en) Apparatus and method for concurrent voice and data transmission
KR100422755B1 (en) ACTIVATION OF MULTIPLE xDSL MODEMS WITH IMPLICIT CHANNEL PROBE
US20050201294A1 (en) Activation of multiple xDSL modems with half duplex and full duplex procedures
EP1024648A2 (en) Communication system
US7113574B1 (en) Integrated telephone set with an xDSL-modem
WO2004008653A1 (en) Faster modem method and apparatus
US5394392A (en) Method for transferring information using modems
US6519280B1 (en) Method and apparatus for inserting idle symbols
WO2002011418A2 (en) Handshaking communication system for multiple xdsl
EP1119173B1 (en) Transmitting DSL startup parameters over a voice channel
EP1422918B1 (en) Activation of multiple xDSL modems with half duplex and full duplex procedures
EP0990341B1 (en) Vdsl modem divided into a digital and an analog part
KR100584331B1 (en) Method for managing power in asymmetrical data transmitting apparatus using adsl
Wu et al. TI DSP implementation of a medium speed DSL (MDSL) for multimedia applications
EP0983691A2 (en) Apparatus and method for a multipoint dsl modem
JP2001024736A (en) Modem mixing mode operating method for dsl system operating under tcm-isdn, modem and computer usable medium
WO2002087208A2 (en) Modem relay system for dsl transmission

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20151001