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WO1997044947A1 - Systeme de communication multimedia a commande vocale - Google Patents

Systeme de communication multimedia a commande vocale Download PDF

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Publication number
WO1997044947A1
WO1997044947A1 PCT/US1997/007910 US9707910W WO9744947A1 WO 1997044947 A1 WO1997044947 A1 WO 1997044947A1 US 9707910 W US9707910 W US 9707910W WO 9744947 A1 WO9744947 A1 WO 9744947A1
Authority
WO
WIPO (PCT)
Prior art keywords
upstream
downstream
coupling
signals
bandwidth
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.)
Ceased
Application number
PCT/US1997/007910
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English (en)
Inventor
Dev V. Gupta
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.)
Integrated Network Corp
Original Assignee
Integrated Network Corp
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 Integrated Network Corp filed Critical Integrated Network Corp
Priority to AU28332/97A priority Critical patent/AU2833297A/en
Publication of WO1997044947A1 publication Critical patent/WO1997044947A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • 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
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires

Definitions

  • Today's public communication network consists of many separate end-to-end service networks. Private leased line networks are deployed for enterprise networking.
  • the Public Switched Telephone Network is utilized for telephony.
  • Data networking utilizes X.25 public packet networks or emerging frame relay or Switched Multimegabit Data Service (SMDS) networks.
  • SMDS Switched Multimegabit Data Service
  • Television is provided by a separate satellite/fiber/coaxial cable network.
  • a phone line connects the handset to the local telephone company.
  • Broadband coax cable is used to connect the VCR and TV to the local cable company's transmitter.
  • a separate phone line may be required to connect to the family PC Internet access, computer subscription services, or a local electronic bulletin board.
  • Multimedia Access Network consisting of a layer of distributed access gateways.
  • These gateways would be compatible with a variety of distribution loop technologies (e.g., copper pairs, fiber/coax, or switched digital fiber) and would permit network operators to upgrade their cable infrastructure and topologies over time without needing to replace the gateways themselves.
  • the access network would use a loop format which will become the basis for the standard multimedia transmission to the home. While providing service adaption and access, the network would also offer routing to the appropriate backbone, switching and broadcasting, and level 1 gateway (i.e., subscriber interaction) functionality.
  • a Multimedia communication requires the simultaneous delivery of time synchronized audio, video and data signals.
  • a Multimedia Access Network has the task of delivering such signals to and from a switching entity and a multiple subscriber premises which it services.
  • the switching entity acts as a gateway to the rest of the world and allows the subscribers access into the (multiple) backbone networks terminating on it. For this reason the switching entity can be called an Access Gateway (AGW) .
  • AGW Access Gateway
  • the switching entity may not be geographically centralized. It may consist of a centralized access node connected with one or more remote nodes .
  • a Residential Gateway terminates the multimedia signals from the switching entity AGW and regenerates the communication services being consumed.
  • the AGW must communicate with the RGW over some physical media. This media may be wireless or wireline. Multimedia wireless communication is a topic undergoing much research and is an emerging technology. The most common wireline media currently deployed uses Hybrid
  • HFC Fiber Co-Ax
  • POTS Plain Old Telephone Signals
  • Copper drop networks are deployed by telephone operators and have the advantage that they are star connected. Each RGW has its own connection with the AGW.
  • copper as deployed in the telephone plant, is not an effective broadband physical medium and is fundamentally designed to provide physical transport in the 0-4 KHz base band region over 1300 ohms of wire.
  • Current (second generation) Fiber-To-The-Curb (FTTC) networks are being deployed by the telephone operator to overcome the above mentioned problem with the copper drops.
  • FTTC networks optical fiber connects an Optical Network Unit (ONU) mounted in outside plant (on poles or in manholes) to the AGW. From th ONU, co-ax and (pre-existing) copper runs are used to provide POTS and broadband services to the subscriber.
  • ONU Optical Network Unit
  • co-ax and (pre-existing) copper runs are used to provide POTS and broadband services to the subscriber.
  • a multimedia system which has the ability to simultaneously transmit voice (POTS) , and data and video bandwidth signals from a remote node (RN) to a local node, such as a regional gateway (RGW) system (Downstream Direction) and to send such signals from the RGW to the RN (Upstream) direction.
  • RN may, for example, comprise an Optical Remote Node (ORN) mounted in an outside plant (on poles or in manholes) which is connected upstream to an Access Gateway Network (AGW) via a wideband fiber optic communication link.
  • ORN Optical Remote Node mounted in an outside plant (on poles or in manholes) which is connected upstream to an Access Gateway Network (AGW) via a wideband fiber optic communication link.
  • AGW Access Gateway Network
  • the AGW may be connected to the world via a backbone network as described, for example, in the aforementioned "Scalable Multimedia Network.”
  • the ORN is connected to a multiplicity of Regional Gateway Networks (RGWs) via existing or added cooper wire.
  • RGWs may be located, for example, in the basements of apartment buildings. The RGWs simultaneously supply POTS and multimedia signals to and from subscribers in the apartments after separating out the various signals from the channels in which they are transported.
  • three transport channels are utilized to transport signals over the copper wire media extending between the ORN and RGWs : a POTS, or voice channel, for bi-directional transport of POTS bandwidth signals, an upstream channel for bi-directional transport of upstream bandwidth signals between the RGWs and the ORN, and a downstream channel for bidirectional transport of downstream bandwidth signals between the ORN and the RGWs.
  • a POTS or voice channel
  • the voice or POTS channel is coupled to the wire media by a coupling circuit comprised of series connected, low pass and longitudinal filters at the RN and a low pass filter at the RGW.
  • the longitudinal filter is preferably a balanced inductor (BALUN) .
  • the upstream bandwidth signals are modulated at the RGW coupled to the wire media and decoupled at the ORN and demodulated.
  • QPSK Quadrature Phase Shift Keying
  • the downstream bandwidth signals from the ORN are likewise coupled to the media and modulated preferably using a quadrature amplitude modulation (QAM) to transport the broadband downstream signals from the ORN to the RGW where they are decoupled from the media and demodulated.
  • QAM quadrature amplitude modulation
  • Fig. 1 is a block-diagram drawing of a multimedia communication system of the invention.
  • Fig. 2 is an illustration of a copper drop network cell.
  • Fig. 3 is an illustration of how the collection area of a network cell may be extended.
  • Fig. 4 is a plot of the spectrum allocation for the multimedia system of the invention.
  • Fig. 5 is a schematic diagram of a coupling circuit used at the ORN portion of the system.
  • Fig. 6 is a schematic diagram of a coupling circuit used at the RGW portion of the system.
  • Fig. 7 is a block diagram of the preferred modulator for the upstream channel of the invention.
  • Fig. 8 is a block diagram of the preferred demodulator for the upstream channel of the invention.
  • Fig. 9 is a block diagram of the preferred modulator for the downstream channel of the invention.
  • Fig. 10 is a block diagram of a preferred demodulator for the downstream channel of the invention.
  • Fig. 1 there is shown an advanced "filter to the curb” (FTTC) multimedia network 10 in accordance with the invention which does not require “curb cracking" since the optical remote nodes 14
  • FTTC filter to the curb
  • ORN- L ORN n are connected to the RGWs 16 (RGW, RGW 2 ,
  • RGW 3 RGW n at the customer premises 300 via existing or added copper wire pairs 30.
  • fiber based broadband media 32 such as a Synchronous Optical Network (SONET) based Asynchronous Transfer Mode (ATM) system may be used to provide POTS and Multimedia service to the ORNs from an Access Gateway Network (AGW) 12.
  • SONET Synchronous Optical Network
  • ATM Asynchronous Transfer Mode
  • AGW provides multimedia access to/from a Backbone Network 15 as described in the aforesaid "Scalable Multimedia Network" application.
  • the RGWs 16 separate out the voice, data and video signals on the respective channels of communication and feed the separated signals to the appropriate voice 18, data 20 or video instruments 22 or sets at the customer/subscriber premises 300.
  • Table II shows the bandwidth requirement the copper drop will be expected to support for the service mix desired. From this table it is clear that a downstream channel operating at 20+ Mbps and an upstream channel operating at 600+ Kbps would be adequate to support this service mix. These channels must operate over lifeline POTS service to provide the full gamut of desired residential services. Table II. Bandwidth Requirements on the Copper Drop for a Full Compliment of Residential Services
  • FIG. 2 shows a drop network cell at the center of which the ORN 14 is located. It is envisioned that approximately 500 subscriber premises each allocated 0.5 acres (after accounting for overhead) can be reached from a single ORN.
  • the drop network cell needs to have a diagonal "radius" of 2,000 feet.
  • collection over a greater area can be effected using the double-star topology shown in
  • Fig. 3 where one or more satellite ORNs 14' can be homed onto the main ORN 14M using pole-to-pole or manhole-to- manhole co-ax cable over which power and broadband connectivity can be extended.
  • MOV Multimedia-Over-Voice
  • Fig. 4 shows a Frequency Division Multiplex (FDM) architecture for such a loop.
  • the POTS channel occupies the 0-4 KHz band
  • the upstream channel occupies the _> 50 KHz to ⁇ 1.8 MHz band labeled return link (fl to f2)
  • the downstream channel occupies the 2 MHz to 8 MHz band labeled QAM link which stands for Quadrature Amplitude Modulated (f3 to f4) .
  • FIGs. 5 and 6 the coupling system for combining and separating (orthogonalizing) the POTS bandwidth channel and the upstream and downstream bandwidth channels as appropriate at the ORN (Fig. 5) and at the RGWs (Fig. 6) will now be described.
  • the POTS channel signals from the AGW 12 on the ONU 32 are coupled across the input Tip and Ring wires (T&R) of the ORN coupling circuit 50A.
  • the QAM modulated downstream channel signals at 20+ Mbps from the downstream modulator 90 are coupled to amplifier driver 46 of ORN low impedance coupling circuit 44 for coupling to the output Tip and Ring
  • the upstream channel signals at 600 Kbps are input on Tip and Ring wires To/Ro and are coupled through transformer T l f to output or driver amplifier 48 to the upstream demodulator 60B.
  • the RGW 16 coupling circuit 50B (Fig. 6) the POTS channel signals from the ORN 14 are input to the Tip and Ring input wires and passed directly through Filter LPF1' to the output Tip and Ring leads (To/Ro) to the telephone unit 18 at the subscriber premises.
  • the downstream channel signals from the downstream transmitter modulator 90 at 20+ Mbps are also coupled across input T&R leads and passed to the input coil 42' of transformer Tl' to amplifier 48' where they are coupled to downstream demodulator - Fig. 10, at the RGW 16.
  • the upstream channel signals from the subscribers consist mainly of data and/or Video On Demand or teleconferencing signals. These signals are coupled to the input terminal 61 of a Dual Rail Splitter circuit 64 of Upstream Modulator 60A (Fig. 7) .
  • the modulated output upstream channel signals are coupled to input amplifier 46' of low impedance circuit 44' of the coupling circuit 50B at the RGW 16 (Fig. 6) ; where they are coupled via transformer Tl' onto the output Tip and Ring Leads T 0 and R 0 onto the copper wire media 30 to the ORN 14 for demodulation at the upstream demodulator 6OB (Fig. 8) .
  • the POTS channel signals must not interfere with nor be interfered by the other channels.
  • the band 0-4 KHz must be transparently provided to the POTS system.
  • the POTS system unless properly conditioned, consists of a large amount of interference outside the 0-4 KHz band which would corrupt the other channels.
  • Dial pulses in the POTS system cause 48V transitions that are abrupt and have an abundance of high frequency content .
  • the sudden engagement of a ringing signal on the POTS channel and its subsequent dis-engagement can cause up to 200V transients that can be very disruptive to the other channels.
  • the ringing signal is applied by grounding the Tip line T while applying the ringing signal to the Ring Line R. This unbalanced signal has high common mode voltages present.
  • Such "longitudinal" signals can be converted to interfering "metallic" (differential) signals by the longitudinal unbalance (poor common mode rejection ratios) of the receiving front ends of the other channel (s) .
  • Passive filtering in the form of a Low Pass Filter LPF1 is used at coupling circuit 50A (Fig. 5) at the ORN 14 for a Low Pass Filter (LPF) function to preserve the life-line nature of this service.
  • a longitudinal filter LFl is used only at the ORN coupling circuit 50A. LFl produces a high impedance in the longitudinal path while being essentially transparent in the metallic path.
  • the longitudinal filter LFl is a balanced inductor (BALUN) in the form of series connected 2 mH inductors L5 and L6 on the Tip (T) and Ring (R) lines respectively.
  • the BALUN is normally bifilar wound as indicated by the polarity dots.
  • the millihenray (mH) inductors L1-L4 at the ORN Ll'-L4' at the RGW are provided to present a high impedance in the data band channels and to prevent the POTS low pass filter LPFl from attenuating the high frequency signals.
  • the longitudinal filter LFl (described above) is not required at the RGW end 16 (Fig. 6) because the telephone is a balanced ("floating") instrument and produces no longitudinal signals .
  • 50B are based on a fourth order 0.25 db ripple Tchebyschef response, scaled to an impedance of 900 ⁇ and a cut-off frequency of 50 KHz. Filtering at 600 ⁇ can be achieved by impedance scaling the filtering. A "click" filter CF1 is included across the Tip and Ring lines and is only visible to ringing signals. Low impedance coupling circuits 44 and 44' have low impedance (compared to 900 ⁇ ) and do not seriously degrade the response. In the upstream and downstream frequency band channels the copper wire 30 has a characteristic impedance in the 100 ⁇ neighborhood unlike the 600 ⁇ /900 ⁇ impedance level for the voice channel.
  • the low impedance coupling circuits 44 and 44' can therefore comprise 1:1 pulse transformers Tl and Tl' with a capability to pass the 50 KHz through 10 MHz combined bandwidth of the upstream and downstream data and video bandwidth signals at a 100 ⁇ source/100 ⁇ load impedance level.
  • This can be readily achieved using ⁇ 0.25 mH coils 40, 40' on a high frequency ferrite or a powdered iron torridal core 42, 42' (carbonyl C or better) .
  • the windings present minimal impedance relative to the impedance of the 0.018 ⁇ F capacitor Cl, Cl' in series with Tl, Tl' at ⁇ A KHz. Therefore, the coupling circuits 44 and 44' look like they are not present to the POTS band.
  • the 0.018 ⁇ F coupling capacitor Cl has a low impedance across the upstream and downstream bands and therefore does not excessively attenuate coupling.
  • the 20 Hz POTS ringing signals and 48V DC POTS transients that may pass through the POTS Low Pass Filters LPFl produce most of the voltage over the 0.018 ⁇ F coupling capacitor Cl and do not create large voltages across Tl. This prevents saturation from occurring at the coupling amplifiers 46, 48.
  • Figs. 7 and 8 illustrate a preferred embodiment of the respective digital modulators and demodulators of the upstream channel system of the invention.
  • the upstream modulator at the RGW maps the digital sequence signals from the subscriber onto a carrier frequency signal having a waveform appropriate for transmission over the copper pair media.
  • the demodulator at the ORN processes the media corrupted received waveforms to reproduce or recover the original digital sequence.
  • the spectrum of the 600 Kbps upstream channel which may contain up to 1 Kbps VOD signals, 64 Kbps telephony signals and 394 Kbps video teleconferencing signals, is sandwiched between the low frequency narrow band spectrum of the POTS channel and the high frequency wide bandwidth downstream channel.
  • the available bandwidth ranges from about 50 KHz to about 1.8 MHz which is a band of about 1.75 MHz. If only video services are required, then the only purpose of the upstream channel is to provide service control from the subscriber to the network via the ORN's 14. Even a 64 Kbps frequency would be adequate for this response with enough left over to provide low bandwidth data communication services over the copper wire medium 30.
  • a well-known angle based modulation system such as Frequency Shift Keying (FSK) modulation
  • FSK Frequency Shift Keying
  • QPSK QPSK
  • a baud rate 1.024 MHz is used.
  • the passband signal extends from 256 KHz to 1.792 MHz, which fits nicely into the desired spectral window and intersymbol interference is avoided.
  • a modulator circuit 60A (Fig. 7) is provided at the RGW 16 which accepts the input data in standard alternate mark inversion (AMI) bipolar format from the subscriber at 2.048 Mbps.
  • the input signal is split into two 1,024 Mbps bit streams labeled ST1 and ST2, using well-known Dual Rail Splitter circuit 64.
  • Sampling system clock 72 is used by circuit 64 to sample the input stream at one-half the input data rate to produce the two separate streams ST1 and ST2 of respective positive and negative going pulses.
  • the baseband bit streams are then Pulse Amplitude Modulated onto a carrier frequency signal using raised cosine 50% Excess Bandwidth sinusoidal PAM encoders 62 and 62', respectively, for each data stream.
  • Circuit 67 divides the 2.048 Mbps clock by two and multipliers 66 and 66' create the 90° phase shifted outputs ST3 , ST4
  • the two modulated bit streams are re-combined in summing amplifier 68, and passed through (0.256 MHz to 1.792 MH) Low Pass Filter 70.
  • Filter 70 rejects all harmonic content present in the modulating clocks.
  • the output of filter 70 is coupled to amplifier 46' of coupling circuit 50B of Fig. 6 for transmittal over the copper pair 30 to the 0RN14 upstream.
  • the modulated upstream channel signals from coupling circuit 50A at the ORN14 are received at receive filter 74 of demodulator 60B.
  • Filter 74 rejects all signals other than the 2.048 Mpbs signals occupying the 50 KHz to 1.8 MHz upstream channel.
  • Carrier recovery circuit 76 recovers the carrier signal used in the QAM modulation circuit of Fig. 7 to produce sine and cosine quadrature clock/pulses.
  • Multiplier circuits 78 and 78' recover the transmitted modulated rails which are passed through Low Pass Filters 81 and 81' to Equalizer 80.
  • the split rail demodulated bit stream is equalized to compensate for transmission losses in equalizer 80 and detected by decision device 82, which includes a slicer circuit (not shown) and a comparator (not shown) which determines when the incoming signal exceeds a predetermined threshold and is therefore a valid data signal .
  • the two demodulated bit streams ST1 and ST2 are combined in (well known) Dual Rail combiner 84 by alternating bits from the two rails to re-create the 2.048 Mpbs upstream data from the RGW modulator 60A.
  • the demodulated signals are coupled to AGW12 via ONU media 32.
  • Carrier recovery circuit 76 is also used to regenerate the 2,048 Mbps clock signal from the RGW16 to synchronize the equalizer and decision device circuits 80 and 82, respectively.
  • the Downstream Channel modulator 90 and demodulator 900 are depicted in general in Fig. 9 and Fig. 10, respectively.
  • a full complement downstream channel requires up to 16.448 Mbps.
  • the downstream channel uses a frequency band starting from 2.0 MHz.
  • Either 16 Quadrature Amplitude Modulation (QAM) or 64 QAM technology may be used to transport the downstream channel over the copper wire from the ORN 14 to the RGW 16.
  • a 16 QAM technology can be used to achieve a 20 Mbps bit rate in which case, the baud rate must be 5 Mbaud.
  • 20% excess bandwidth raised cosine pulses are preferably the basic pulse shapes used on each of the I, Q axis, in which case the passband signal will occupy the 2 MHz to 8 MHz band. If the same band is used with 64 QAM, a bit rate of 30 Mbps can be achieved.
  • a Decision Feedback Equalizer (DFE) circuit 120 is used in the Modulator 90 to eliminate echoes due to reflections.
  • DFE Decision Feedback Equalizer
  • a 16 Tap Feed Forward Equalizer 102 (8 feedforward taps and 8 feedback taps) in the DFE 120 provides adequate performance for up to 2,000 feet of 24 gauge copper wire media. Since energy can be collected from impulse noise sources (chattering relays, light dimmers, electric motors, etc.) , therefore interleaving along with Forward Error Correction (FEC) is employed to eliminate degraded performance due to impulse noise. FEC also enhances the error performance due to far end cross talk between MOV signals in the wires running adjacently in the binder group.
  • FEC Forward Error Correction
  • High Bit Rate Downstream Bandwidth Signals from the AGW12 and received at the ORN14 for transmittal to an RGW they are first coupled to input port 96 of downstream channel 90 and split into I and Q channels by raised cosine quadrature amplitude modulation carrier by oscillator 95 at respective cosine modulator 94, and sine modulator 94' .
  • the digitally modulated I and Q downstream signals are coupled to DFE circuit 120 comprising feed forward equalizer 102 coupled to respective I and Q rail summing amplifiers 104, 104' and threshold detectors 106, 106' ; the outputs of which are combined in combiner 110 and passed to low impedance amplifier 46 at the ORN coupling circuit 50A for transmission over the copper wire media 30 to the RGW.
  • Acquisition and Tracking Loops circuit 92 provides clock synchronization pulses.
  • the downstream demodulator 900 is functionally equivalent to the upstream demodulator 60B.
  • the QAM modulated downstream carrier signal from the RGW coupling circuit 50B at the low impedance amplifier 48' is coupled to receive filter 740 and demodulated into two bit streams by mixing with the carrier signal in mixers 780 and 780' .
  • the carrier signal is recovered in circuit 760.
  • the demodulated signals are passed through low-pass-filters 781, 781', equalized in equalizer 800 and detected in decision device 820.
  • the detected signals are combined in combiner 840 and coupled to the subscriber at the customer premises 300.
  • a multimedia over voice communication system has been described above using 16 QAM a 20 Mbps (18 Mbps after FEC) signal along with a 2.048 Mbps upstream signal which can be transferred over 2,000 feet of 24 gauge wire in the presence of impulse noise and 1% FEXT while maintaining a Bit Error Rate (BER) of ⁇ 10 "8 .
  • BER Bit Error Rate

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Système de communication permettant de communiquer simultanément par des signaux à largeur de bande vocale, de données et vidéo via un réseau de communication. Les signaux sont transportés dans une direction aval depuis un noeud distant vers un système régional de communication interréseau (réseau RGW) et sont également transportés dans une direction amont depuis le système régional de communication interréseau jusqu'au noeud distant. Dans les deux cas les signaux sont transportés via les mêmes supports à fils de cuivre.
PCT/US1997/007910 1996-05-21 1997-05-09 Systeme de communication multimedia a commande vocale Ceased WO1997044947A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28332/97A AU2833297A (en) 1996-05-21 1997-05-09 Multimedia over voice communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65366096A 1996-05-21 1996-05-21
US08/653,660 1996-05-21

Publications (1)

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Cited By (9)

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WO2000062501A3 (fr) * 1999-04-13 2002-01-03 Broadcom Corp Passerelle vocale
US6477249B1 (en) 1997-12-09 2002-11-05 Nortel Networks Limited Communications signal splitter and filter
WO2002023824A3 (fr) * 2000-09-11 2003-09-04 Broadcom Corp Modem cable avec capacite de traitement vocal
US6765931B1 (en) 1999-04-13 2004-07-20 Broadcom Corporation Gateway with voice
US6912209B1 (en) 1999-04-13 2005-06-28 Broadcom Corporation Voice gateway with echo cancellation
US6928864B1 (en) 1999-09-30 2005-08-16 In-Situ, Inc. Tool assembly and monitoring applications using same
EP1942607A2 (fr) 2000-09-11 2008-07-09 Broadcom Corporation Modem à câble avec capacité de traitement vocal
US7933295B2 (en) 1999-04-13 2011-04-26 Broadcom Corporation Cable modem with voice processing capability
US8254404B2 (en) 1999-04-13 2012-08-28 Broadcom Corporation Gateway with voice

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6477249B1 (en) 1997-12-09 2002-11-05 Nortel Networks Limited Communications signal splitter and filter
US6985492B1 (en) 1999-04-13 2006-01-10 Broadcom Corporation Voice gateway with voice synchronization
US8254404B2 (en) 1999-04-13 2012-08-28 Broadcom Corporation Gateway with voice
US6765931B1 (en) 1999-04-13 2004-07-20 Broadcom Corporation Gateway with voice
US6912209B1 (en) 1999-04-13 2005-06-28 Broadcom Corporation Voice gateway with echo cancellation
USRE46142E1 (en) 1999-04-13 2016-09-06 Broadcom Corporation Modem with voice processing capability
WO2000062501A3 (fr) * 1999-04-13 2002-01-03 Broadcom Corp Passerelle vocale
US9288334B2 (en) 1999-04-13 2016-03-15 Broadcom Corporation Modem with voice processing capability
US8582577B2 (en) 1999-04-13 2013-11-12 Broadcom Corporation Modem with voice processing capability
US7701954B2 (en) 1999-04-13 2010-04-20 Broadcom Corporation Gateway with voice
US7933295B2 (en) 1999-04-13 2011-04-26 Broadcom Corporation Cable modem with voice processing capability
US6928864B1 (en) 1999-09-30 2005-08-16 In-Situ, Inc. Tool assembly and monitoring applications using same
EP1942607A3 (fr) * 2000-09-11 2008-07-30 Broadcom Corporation Modem à câble avec capacité de traitement vocal
EP1942607A2 (fr) 2000-09-11 2008-07-09 Broadcom Corporation Modem à câble avec capacité de traitement vocal
WO2002023824A3 (fr) * 2000-09-11 2003-09-04 Broadcom Corp Modem cable avec capacite de traitement vocal

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Publication number Publication date
AU2833297A (en) 1997-12-09
TW342565B (en) 1998-10-11

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