WO2012037851A1 - 支持线分双工的xDSL宽带接入方法与系统 - Google Patents

支持线分双工的xDSL宽带接入方法与系统 Download PDF

Info

Publication number
WO2012037851A1
WO2012037851A1 PCT/CN2011/079462 CN2011079462W WO2012037851A1 WO 2012037851 A1 WO2012037851 A1 WO 2012037851A1 CN 2011079462 W CN2011079462 W CN 2011079462W WO 2012037851 A1 WO2012037851 A1 WO 2012037851A1
Authority
WO
WIPO (PCT)
Prior art keywords
module
signal
xdsl
line
analog
Prior art date
Application number
PCT/CN2011/079462
Other languages
English (en)
French (fr)
Inventor
陈相宁
张自科
张鹏
赵莽
Original Assignee
南京大学
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 南京大学 filed Critical 南京大学
Publication of WO2012037851A1 publication Critical patent/WO2012037851A1/zh

Links

Images

Classifications

    • 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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1415—Two-way operation using the same type of signal, i.e. duplex using control lines
    • 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
    • H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the invention belongs to a method for a user terminal to access a communication service network and an implementation system thereof, and in particular to a method and system for increasing an uplink data transmission rate.
  • Digital Subscriber Line is a combination of transmission technology using metal twisted pair as the transmission medium, including high-speed digital subscriber line (HDSL), symmetric digital subscriber line (SDSL), asymmetric digital subscriber line (ADSL), and rate adaptation.
  • Data Subscriber Line (RADSL), Very High Speed Digital Subscriber Line (VDSL) and 2nd Generation Very High Speed Digital Subscriber Line (VDSL2) are generally referred to as xDSL.
  • DMT Discrete Multitone Modulation
  • the so-called discrete multitone modulation, its correlation module includes two parts: symbol codec and time-frequency domain transform modulator, as shown in Figure 5 of ITU-T specification G.992.1 and Figure 10 of G.993.2. It first divides the data bit stream sequence to be transmitted into short bit groups, and specifies a specific subcarrier of each group of bits to modulate the DMT; and then maps each bit group code to a constellation point of the subcarrier signal constellation by the trellis encoder.
  • the constellation symbol of the subcarrier is formed; the constellation symbol set of all subcarriers is mapped to the time domain by an inverse discrete Fourier transform (IDFT) to form a sequence of time domain sampling points; and the sequence of the time domain sampling points is cyclically extended and window processed After that, it becomes the output of the discrete multi-tone modulated sampling signal.
  • IDFT inverse discrete Fourier transform
  • a window interception is performed on the time-domain sampling point sequence of the DMT modulation, and then a discrete Fourier transform (usually implemented by an FFT fast Fourier transform) is performed on the fixed-length sampling sequence to restore the modulated signal to the frequency.
  • the domain is further reduced in the frequency domain by the signal decoding decision on each DMT subcarrier into a bit group; finally, the bit group inverse mapping is restored to the data bit stream according to the mapping method of the bit group to the DMT subcarrier agreed by both parties.
  • the current xDSL broadband access system includes: an "xDSL modem” belonging to the customer premises equipment, a "twisted pair” connecting the "xDSL modem” and the “DSL access module”, and a “DSL access module” belonging to the central office equipment.
  • Figure 1 a block diagram of a prior art xDSL digital subscriber line broadband access system.
  • the core device is an "xDSL modem” deployed in the user's home and a "DSL access module" belonging to the central office equipment.
  • the "xDSL modem” is mainly composed of four modules: “frequency division duplex 2-4 line hybrid module”, “analog signal processing module”, “digital signal processing module” and “uplink interface module”.
  • the "frequency division duplex 2-4 line hybrid module” is composed of a set of inductor-capacitor filter and impedance matching circuit, and can also be realized by a RC active filter circuit.
  • the “Analog Signal Processing Module” can be further subdivided into two sub-modules: “Line Driver Module” and “Analog Front-End Module”.
  • the “analog front end” includes digital-to-analog conversion (DAC) and analog-to-digital conversion (ADC).
  • the “Digital Signal Processing Module” can be further subdivided into two sub-modules: "Discrete Multitone Processing (DMT) Module” and “Transmission Aggregation (TC) Module”.
  • DMT Discrete Multitone Processing
  • TC Transmission Aggregation
  • the "Discrete Multitone Processing (DMT) Module” can be subdivided into framing and deframing, encoding and decoding, bit multitone mapping and inverse mapping, and discrete Fourier transform and inverse transform four sub-modules.
  • the "frequency division duplex 2-4 line hybrid module” separates the received signal from the shared twisted pair line, and sends it to the “analog signal processing module” to complete the receiving filtering and variable of the received analog signal.
  • the data signal (usually Ethernet) format is provided to the local terminal; in the "xDSL modem” transmission direction, the network “uplink interface module” receives the signal sent by the local terminal (usually the Ethernet format) and sends it "Digital Signal Processing Module", which takes out valid data and multiplexes it into a unified format, and then scrambles After RS coding and interleaving processing, it is sent to the framer for multiplexing into data frames, and then discrete multi-tone modulation is performed, and the modulated signal is sent to the “analog signal processing module”, and the digital signal is converted into an analog waveform signal, which is filtered and amplified. After processing, the "frequency division duplex 2-4 line hybrid module” is output to the twisted pair line shared by the transceiver.
  • the chips that provide "analog signal processing module” are: ST70138, ST20174 of STMicroelectronics, BCM6529, BCM6306 of Broadcom, MT3201, MT3301 of Art Communication Technology, AD6482, AD6483, AD6484 of American Analog Devices, Lantiq VRX208, PSB80170.
  • the chips providing "digital signal processing module” are: AD6485, AD6486, AD6487 of American Analog Devices, MT2201 of Yichuan Technology, ST20196, ST20184 of STMicroelectronics, VRX268, PSB80600, PSB80800 of Lantiq.
  • the chips that provide the "uplink interface module" in the "xDSL modem” include Realtek's RTL8201, LSI's AR229, Intel's LXT972, and Lantiq's PHY11G.
  • the TRI-VSP200 and other chips of Chuangdat Company realized the "analog signal processing module", "digital signal processing module” and "uplink interface module” at the same time.
  • the standard cabinet “DSL access module” consists of one or more “xDSL line card module” and two “uplink interface modules” that are backed up by each other. Each "xDSL line card module” supports multiple xDSL signal channels. The "xDSL line card module” and the “upstream interface module” are interconnected through the system backplane bus. A small “DSL access module” requires only one “xDSL line card module” and one "upstream interface module", which can be designed on the same board to reduce the installation volume.
  • the "xDSL line card module” in the “DSL access module” mainly consists of "frequency division duplex 2-4 line hybrid module", “line drive module”, “analog front end module”, “discrete multi-tone processing module",
  • the "transport aggregation module” is composed.
  • a single xDSL channel is taken as an example to describe the working principle of the "DSL access module”.
  • the "frequency division duplex 2-4 line hybrid module” separates the received signal from the shared twisted pair, and sends it to the "analog front end module" to complete the reception.
  • the outgoing link frame signal is sent to the “transport aggregation module” to complete the traffic aggregation of the multiple xDSL links, and then sent to the “uplink interface module” and encapsulated into an Ethernet frame format output.
  • the "uplink interface module” extracts the external payload data received from the Ethernet interface and sends it to the "transport aggregation module", which is encapsulated into a link frame signal.
  • the modulated signal is sent to the "discrete multi-tone processing module" of the designated xDSL port to complete the modulation of the discrete multi-tone signal, and the modulated signal is sent to the "analog front-end module” to convert the digital signal into an analog waveform signal, which is passed through the "line drive module".
  • the "frequency division duplex 2-4 line hybrid module” is output to the shared twisted pair line.
  • the chip providing the “Line Driver Module” includes STLC60243 from STMicroelectronics, PEB22716 from Infineon, VINAX-L1/2 from Lantiq, and CT-L56AC02-QA from Shengtian Company.
  • ADI's AD8018, AD8390, AD8398, AD8404, Intersil's ISL1535, ISL1539, and ISL1557, and the "analog front-end module” chips are Broadcom's BCM6411/21, BCM6511/2, BCM6516, and Texas Instruments' TNETD7112/ 3, Keshengxun, STMicroelectronics STLC60454, Infineon's PEB22720, PEF55304, Lantiq's VINAX-A4/8, Yichuan's MT3301, Shengtian's CT-L56AC02-QA,
  • the "Digital Signal Processing Module” chips are Broadcom's BCM6410/6411, BCM6510, BCM6522/4/6, GST's G24, STMicroelectronics' STLC61265, STLC61266, Infineon's PEF55016, PEF55506, Lantiq The company's VINAX-D4L/D8M,
  • the TRI-VMPA800, VMPD1600 and Ikanos's Velocity, AD11008, FX10050 and FX100100 The functions of "Line Driver Module”, “Analog Front End Module” and “Digital Signal Processing Module” are provided.
  • ADSL2+, G.992.5 ADSL2+ compatible second generation VDSL technology
  • VDSL2, G.993.2 ADSL2+ compatible second generation VDSL technology
  • the effective transmission distance of ADSL/ADSL2+ is 5 ⁇ 6km, the downlink rate of ADSL is up to 8Mbps, the uplink rate is 640kbps, and the downlink speed of ADSL2+ is up to 24Mbps, and the uplink rate is 1Mbps.
  • VDSL2 can achieve uplink data rate of 30Mbps/downstream 50Mbps within 300m, but it is reduced to 10Mbps/downstream 30Mbps to 500m, and only 1Mbps to 1000m. From the perspective of transmission rate, ADSL is difficult to meet the access requirements of high-bandwidth users.
  • ADSL2+ can basically meet the bandwidth requirements in the near future, but the uplink bandwidth is low.
  • VDSL2 performs well at short distances, but can provide a higher uplink bandwidth. Short, can not meet the needs of the actual communication business.
  • the allocation of uplink and downlink spectrum of ADSL/ADSL2+ technology is relatively simple.
  • the continuous frequency band from 25KHz to 138KHz is used to transmit data signals from “ADSL modem” to “DSL access module”, continuous from 276KHz-1.1MHz/2.2MHz.
  • the frequency band is used to send data signals from the "DSL Access Module” to the "ADSL Modem”.
  • the spectrum allocation of VDSL2 technology is complex, with multiple discontinuous uplink and downlink frequency bands, and the uplink and downlink frequency bands are alternately continuous. Since there is no ideal bandpass filter, the alternate continuous uplink and downlink frequency band division methods are not only complicated, but also have a certain guard bandwidth interval, which reduces the spectrum utilization.
  • the bandwidth aggregation technology (G.998.1/2/3) defined by ITU-T can increase the data transmission rate.
  • Bandwidth aggregation also known as channel bundling or link aggregation, provides the bandwidth of two or more connections to a single connection.
  • the advantage of this technology is that the data transmission rate can be significantly improved.
  • the disadvantage is that the ratio of uplink and downlink bandwidth is not adjustable and the implementation is complicated.
  • Temporary Protection Patent 200810019222.2 proposes a method and system for back-binding two telephone lines.
  • the technical implementation of the method is too complicated, and there is still a spectrum utilization problem caused by the guard band interval.
  • the present invention is to solve or partially solve one of the above problems existing in the prior art.
  • the line division duplex xDSL broadband access method of the present invention comprises an "xDSL modem", a "twisted pair” and a “DSL access module” connected to the "xDSL modem” and the "DSL access module", and an xDSL transmission system.
  • the utility model is characterized in that a pair of twisted pairs are added and the original pair of twisted pairs are bundled for transmitting xDSL signals, and one of the bundled two pairs of twisted pairs is used for connection transmission from the "DSL access module".
  • the "Line Driver Module” outputs and sends the xDSL signal to the "Analog Signal Processing Module” in the "xDSL Modem”, which is transmitted from the "xDSL Modem” in the "XDSL Modem” with the other pair of the bundled two pairs of twisted pairs.
  • the processing module “outputs and sends to the xDSL signal of the "analog front-end module” in the "DSL access module”, and realizes full-duplex xDSL signal transmission of the xDSL system by line division duplexing.
  • the improved xDSL broadband access method of the present invention is that in a wired digital communication system that implements discrete multitone modulation and demodulation by using a fast Fourier transform technique, two pairs of twisted pairs are bundled to transmit xDSL signals, which are characterized by mutual communication.
  • the two devices consist of "line driver module”, “analog front-end module”, “discrete multi-tone processing module”, “transport aggregation module” and “uplink interface module”.
  • the "uplink interface module” in any device extracts the payload of the received data from the outside and sends it to the "transport aggregation module”, encapsulates it into a link frame signal, and sends it to the "discrete multi-tone processing module” to complete the discrete After the multi-tone signal is modulated, it is sent to the “analog front-end module”, and the digital signal is converted into an analog waveform signal. After being filtered and amplified by the “line driver module”, it is sent to the other device through a pair of dedicated twisted pairs.
  • Analog front-end module completes the receiving filtering, variable gain amplification, discrete sampling and quantization of the received analog signal, converts the analog signal into a digital signal, and sends it to the “discrete multi-tone processing module” for digital signal processing to complete the digital Demodulation of the tone signal, the demodulated link frame signal is sent to the "transport aggregation module", and after the traffic convergence of the xDSL link is completed, it is sent to the "uplink interface module” for external output.
  • Full-duplex xDSL signal transmission is realized by line division duplexing of two pairs of twisted pairs.
  • the present invention also proposes a line division duplex xDSL modem device comprising: an "analog front end module” for implementing digital to analog conversion (DAC) and analog to digital conversion (ADC) for implementing discrete multitone modulation and demodulation "Discrete Multitone (DMT) Processing Module”, “Transport Aggregation Module” for data format conversion and multi-channel traffic aggregation, “Line Driver Module” for large dynamic range linear power amplification and for implementation and The “uplink interface module” for local terminal interconnection.
  • DAC digital to analog conversion
  • ADC analog to digital conversion
  • DMT Discrete Multitone
  • Transport Aggregation Module for data format conversion and multi-channel traffic aggregation
  • Line Driver Module for large dynamic range linear power amplification and for implementation
  • the “uplink interface module” for local terminal interconnection.
  • the "uplink interface module” extracts the payload of the data received from the local terminal, sends it to the “transport aggregation module”, encapsulates it into a link frame signal, and sends it to the "discrete multi-tone processing module” to complete the discrete multi-tone. After the signal is modulated, it is sent to the “analog front-end module”, and the digital signal is converted into an analog waveform signal.
  • the module After being filtered and amplified by the “line driver module”, it is sent to the local transmit dedicated twisted pair port; on the other hand, the “analog front end”
  • the module receives the analog signal from the local receiving dedicated twisted pair port, completes the receiving filtering, variable gain amplification, discrete sampling and quantization of the received analog signal, converts the analog signal into a digital signal, and sends it to the discrete multi-tone
  • the processing module performs digital signal processing to complete demodulation of the digital multi-tone signal, and sends the demodulated link frame signal to the "transport aggregation module” to complete the data format conversion and traffic convergence, and then through the "uplink interface module” Local terminal output.
  • the invention also proposes a line division duplex DSL access module, comprising: a line division duplex xDSL line card board module supporting multiple xDSL channels and an "uplink interface module" for interconnecting with a local broadband application server.
  • the line-division duplex xDSL line card module includes an "analog front-end module” for digital-to-analog conversion (DAC) and analog-to-digital conversion (ADC) for "discrete multi-tone modulation and demodulation.”
  • DAC digital-to-analog conversion
  • ADC analog-to-digital conversion
  • DMT Discrete Multitone
  • Processing Module Transport Aggregation Module
  • Transport Aggregation Module for data format conversion and multi-channel traffic aggregation
  • Line Driver Module for large dynamic range linear power amplification.
  • the "uplink interface module” extracts the payload of the data received from the local broadband application server, sends it to the “transport aggregation module”, encapsulates it into a link frame signal, and sends it to the "discrete multi-tone processing module” to complete the discrete After the multi-tone signal is modulated, it is sent to the “analog front-end module”, and the digital signal is converted into an analog waveform signal.
  • the analog front-end module After being filtered and amplified by the “line driver module”, it is sent to the local transmit dedicated twisted pair port; on the other hand “
  • the analog front-end module receives the analog signal from the local receiving dedicated twisted pair port, completes the receive filtering, variable gain amplification, discrete sampling and quantization of the received analog signal, converts the analog signal into a digital signal, and sends it to the discrete
  • the multi-tone processing module performs digital signal processing to complete demodulation of the digital multi-tone signal, and sends the demodulated link frame signal to the "transport aggregation module" to complete the data format conversion and traffic convergence, and then through the "uplink interface module". "Output to the local broadband application server.
  • the invention also proposes a line division duplex xDSL access implementation system, comprising: "xDSL modem", “twisted pair” and “DSL access module” connecting "xDSL modem” and "DSL access module",
  • the "xDSL modem” is a “line-division duplex xDSL modem” according to the present invention
  • the “DSL access module” is a “line-division duplex DSL access module” according to the present invention.
  • the "twisted pair" described in any of the ways of connecting the "wire division duplex modem” and the “line division duplex DSL access module” includes two pairs of twisted pairs used in bundle, one of which The twisted pair is dedicated to transmitting data signals transmitted from the "line division duplex xDSL modem" to the "line division duplex DSL access module", and the other pair of twisted pairs are dedicated to transmission from said " The line-division duplex DSL access module transmits data signals to the "line-division duplex xDSL modem".
  • the invention also proposes a line division duplex VDSL broadband implementation system, comprising: "VDSL2 modem", two pairs of twisted pairs connecting "VDSL2 line card module” in “VDSL2 modem” and “DSL access module” And a “DSL access module” including a “VDSL2 line card module”, characterized in that: the "VDLS2 modem” is a "line division duplex VDSL2 modem", and the "VDSL2 line card board module” is a "line division” Duplex VDSL2 line card module", the two pairs of twisted pairs, one pair for transmitting the line division duplex from the "line division duplex VDSL2 modem" to the "DSL access module”
  • the so-called uplink data of the VDSL2 line card module the other pair is used to transmit the "wire division duplex VDSL2 line card module” from the "DSL access module” to the "line division duplex VDSL2 modem”
  • the so-called downlink data is used to transmit
  • the invention adopts two pairs of twisted pairs to separately transmit uplink and downlink data signals, and each pair of twisted pairs can monopolize the entire channel bandwidth, thereby improving the data transmission rate, especially the uplink transmission rate is more prominent. Even for an xDSL system that has been divided into uplink and downlink frequency bands, since the uplink and downlink signals are transmitted separately, the mutual interference between the uplink and downlink signals on the same pair of twisted pairs is reduced, and the total data transmission rate can be improved.
  • the invention adopts two pairs of twisted pairs to respectively transmit uplink and downlink data signals, and both the modem end and the DSL access module end can replace the "frequency division duplex 2-4 lines" by using independent input and output filters with lower technical requirements.
  • Hybrid modules simplify system design and reduce equipment manufacturing and maintenance costs.
  • the invention adopts line division duplexing to realize full-duplex transmission between "xDSL modem” and "DSL access module", and the signal transmitted on any pair of twisted pairs has no influence on another pair of twisted pairs, so the conventional frequency Complex spectrum partitioning in a duplexed xDSL system is no longer necessary.
  • the spectrum bandwidth limitation of the uplink and downlink can be cancelled to further increase the transmission bandwidth.
  • the world does not set different transmission band limits, it will increase the compatibility of the products worldwide.
  • the present invention makes full use of the existing copper wire resources. If the entire available bandwidth of the twisted pair cable is used to transmit uplink and downlink data respectively, the data transmission rate of the access system will be doubled, thereby alleviating the current ubiquitous access network access. The problem of low speed meets the needs of various high-bandwidth network applications and has broad application prospects.
  • the invention only needs to make a minimal improvement to the existing system, that is, to replace the "frequency division duplex 2" in the "xDSL line card module” in the "xDSL modem” and the "DSL access module” by using independent input and output filters.
  • the 4-wire hybrid module can be implemented by adding a pair of twisted pairs and connecting the transmitting and receiving ports at both ends through two pairs of twisted pairs.
  • FIG. 1 is a block diagram of a prior art xDSL digital subscriber line broadband access system.
  • FIG. 2 is a block diagram of a broadband access system supporting the line division duplex xDSL digital subscriber line of the present invention.
  • FIG. 3 is a block diagram of a broadband access system of the line division duplex xDSL digital subscriber line of the present invention.
  • FIG. 4 is a block diagram of a broadband access system of the improved line division duplex xDSL digital subscriber line of the present invention.
  • the core idea of the present invention is to use a pair of twisted pairs to transmit xDSL signals in a wired digital communication system that implements discrete multitone modulation and demodulation using Fast Fourier Transform technology, and to divide the duplex with two pairs of twisted pairs. The way to achieve full duplex xDSL signal transmission.
  • the xDSL broadband access method for supporting the line duplexing in this embodiment is implemented by adding three linkage switches and one pair of additional twisted pairs in the original xDSL system. as shown in picture 2.
  • a double-pole double-throw switch K2 is connected in series, and the normally closed contact pair 1-2 is connected to maintain the original telephone line connection. the way.
  • Contact pair 3 is connected to the newly added twisted pair.
  • the signal output from the "line driver module” in the “xDSL line card module” in the “DSL access module” can still pass the "frequency division duplex" in the "xDSL line card module” in the “DSL access module”.
  • 2-4 line hybrid module output to the double-pole double-throw switch K2 in the original telephone line port, add the new twisted pair through the contact pair 1-3, and finally the contact pair from the double-pole double-throw switch K1 3-1 is sent to the “A/D converter” analog signal input terminal of “Analog Front End Module” in “xDSL Modem”.
  • the signal connection of the "frequency division duplex 2-4 line hybrid module" to the "A/D converter” is unbalanced, so there is only one signal line.
  • the signal ground of the "analog signal processing module” in the "xDSL modem” device is used as the other signal line connecting the double-pole double-throw switch.
  • the "frequency division duplex 2-4 line hybrid module” to "A/D converter” signal connection of the "xDSL line card module” is unbalanced, so there is only one signal. line.
  • the signal ground of the “analog front-end module” in the "xDSL line card module” is used as the other signal line connecting the double-pole double-throw switch.
  • the "frequency division duplex 2-4 line hybrid module” in the "xDSL modem” device and the “DSL access module” device described in the embodiment are actually only responsible for a single direction.
  • the signal transmission does not function as a frequency division duplex filter.
  • the “Frequency Division Duplex 2-4 Line Hybrid Module” can be simplified or even removed, and the input and output ports can be directly interconnected.
  • FIG. 4 A preferred improvement method is shown in FIG. 4, which splits the "frequency division duplex 2-4 line hybrid module” into an output filter and an input filter, which are respectively placed in the "xDSL modem” device and "DSL access”. Module "output and input of the device. Thereby reducing mutual interference between different lines in the bundle of cables.
  • the preferred embodiment under different criteria may separately reserve the output filter or separately reserve the input filter, or may insert other signal processing modules.
  • connection from the "line drive module” to the “analog front-end module” through the dedicated twisted pair is not specifically referred to by the physical wire connection, but means that there is an electrical path to send the signal from one party to the other.
  • the other side includes direct connections using physical metal lines, as well as signal transmission path connections through filters, amplifiers, or other signal processing modules.
  • the limiting feature is only that the dedicated twisted pair is dedicated to signal transmission in one direction.
  • FIG. 3 is a line division duplex xDSL access method that does not use a "frequency division duplex 2-4 line hybrid module", wherein a pair of twisted pairs
  • the xDSL modulated signal in the uplink direction is exclusively transmitted, and the xDSL modulated signal in the downlink direction is exclusively transmitted in the other pair of twisted pairs.
  • the "frequency division duplex 2-4 line hybrid module" in the xDSL system defined by the ITU-T specification can not fully exert the transmission channel capacity of the twisted pair due to artificially limiting the frequency band and bandwidth of the transmitted and received signals.
  • Demolition of the "frequency-division duplex 2-4 line hybrid module" in the "xDSL modem” device and the "DSL access module” device can improve the spectrum utilization of the twisted pair.
  • the "uplink interface module” of the "xDSL modem” extracts the payload of the externally received data and sends it to the "transport aggregation module”, which is encapsulated into a link frame.
  • the signal is sent to the "discrete multi-tone processing module”
  • the discrete multi-tone signal is modulated, and then sent to the “analog front-end module” to convert the digital signal into an analog waveform signal, after filtering and amplifying the "line driver module”.
  • the receiving filtering, variable gain amplification, discrete sampling and quantization of the received analog signal are completed.
  • the analog signal is converted into a digital signal, and then sent to the "discrete multi-tone processing module” for digital signal processing, the digital multi-tone signal is demodulated, and the demodulated link frame signal is sent to the "transmission aggregation module” to complete xDSL. After the traffic of the link is aggregated, it is sent to the "uplink interface module" and finally to the broadband application server.
  • the "uplink interface module” in the “DSL access module” extracts the payload of the received data from the outside and sends it to the "transport aggregation module”.
  • the "discrete multi-tone processing module” After being packaged into a link frame signal, it is sent to the "discrete multi-tone processing module” to complete the discrete multi-tone signal modulation, and then sent to the "analog front-end module” to convert the digital signal into an analog waveform signal, after the "line drive module”
  • the filter amplification process it is sent to the "analog front-end module” of the "xDSL modem” through a pair of dedicated twisted pairs to complete the receive filtering, variable gain amplification, discrete sampling and quantization of the received analog signal, and the analog signal Converted into a digital signal, and then sent to the "discrete multi-tone processing module” for digital signal processing, complete the demodulation of the digital multi-tone signal, and send the demodulated link frame signal to the "transport aggregation
  • connection from the "line drive module” to the “analog front end module” implemented by the dedicated twisted pair as described herein does not specifically refer to the connection through the physical wires, but indicates that there is an electrical path that can send signals from one party to another.
  • One side including direct connections using physical metal wires, also includes signal transmission path connections through filters, amplifiers, or other signal processing modules.
  • the limiting feature is only that the dedicated twisted pair is dedicated to signal transmission in one direction.
  • a preferred embodiment is to use all available discrete multi-tone subcarriers in each direction.
  • a line division duplex VDSL broadband implementation system of this embodiment replaces the "xDSL modem" in the line division duplex xDSL broadband implementation system with "VDSL2 modem” and "xDSL line card module” in FIG. VDSL2 line card module".
  • the system includes: "VDSL2 modem”, two pairs of twisted pairs connecting "VDSL2 line card module” in “VDSL2 modem” and “DSL access module”, and "DSL connection” including “VDSL2 line card module” Into the module", wherein the "VDLS2 modem” is a “line-division duplex VDSL2 modem", the “VDSL2 line card board module” is a “line-division duplex VDSL2 line card board module”, the two pairs of twisted pairs a pair of so-called uplink data for transmitting the "line-divided VDSL2 line card module" from the "line-to-duplex VDSL2 modem" to the "DSL access module", and the other pair The so-called downlink data from the "line division duplex VDSL2 line card module” in the "DSL access module” to the "line division duplex VDSL2 modem” is transmitted.
  • the line division duplex VDSL2 modem in this embodiment includes: an "analog front end module” for implementing digital to analog conversion (DAC) and analog to digital conversion (ADC), for implementing discrete multitone modulation and demodulation.
  • Discrete Multitone (DMT) Processing Module for implementing digital to analog conversion (DAC) and analog to digital conversion (ADC), for implementing discrete multitone modulation and demodulation.
  • DMT Digital to analog conversion
  • ADC analog to digital conversion
  • DMT Digital Multitone
  • Transport Convergence Module for Data Format Conversion and Multi-Flow Convergence
  • Line Driver Module for Large Dynamic Range Linear Power Amplification and for Implementation with Local Terminals Interconnected "uplink interface module”.
  • the “analog front-end module”, “discrete multi-tone processing module”, “transport aggregation module” and “line driver module” are all in compliance with the ITU-T recommended VDSL2 specification, and can be implemented using the mature VDSL2 chipset.
  • the "uplink interface module" in the “line-division duplex VDSL2 modem” extracts the payload of the data received from the local terminal and sends it to the "line-division duplex VDSL2 modem".
  • the "transport aggregation module” is encapsulated into a link frame signal and sent to the "discrete multi-tone processing module” in the "line-division duplex VDSL2 modem” to complete the discrete multi-tone signal modulation.
  • the line division duplex DSL access module in this embodiment includes: a line division duplex VDSL2 line card module supporting multiple VDSL paths and an "uplink interface module" for interconnecting with a local broadband application server.
  • "Line-to-duplex VDSL2 line card module” includes “analog front-end module” for digital-to-analog conversion (DAC) and analog-to-digital conversion (ADC), “discrete for discrete multitone modulation and demodulation” Multi-tone (DMT) processing module, “transport aggregation module” for data format conversion and multi-channel traffic aggregation, and “line driver module” for realizing large dynamic range linear power amplification.
  • DAC digital-to-analog conversion
  • ADC analog-to-digital conversion
  • DMT discrete multitone modulation and demodulation
  • transport aggregation module for data format conversion and multi-channel traffic aggregation
  • line driver module for realizing large dynamic range linear power amplification.
  • analog front-end module includes discrete multi-tone processing module, transport aggregation module and transport driver module.
  • a preferred improvement of this embodiment by upgrading and adjusting the embedded software in the "discrete multi-tone processing module" in the standard VDSL2 chipset, all available multi-tone subcarriers can be used in each direction of the uplink and downlink, thereby It can greatly improve the uplink and downlink transmission bandwidth, especially the uplink bandwidth in the long distance.
  • the “uplink interface module” in the “line-division duplex DSL access module” extracts the payload of the data received from the local broadband application server, and sends the data to the “line-and-double”
  • the "transport aggregation module” in the DSL access module is encapsulated into a link frame signal and sent to the "discrete multi-tone processing module" in the "line-division duplex DSL access module”.
  • the “analog front-end module” in the “line-division duplex DSL access module” is sent to convert the digital signal into an analog waveform signal, and the “wire-division duplex DSL” After the filtering and amplifying processing of the "line driving module” in the access module", it is sent to a local transmission dedicated twisted pair port; on the other hand, the “wire division duplex DSL access module”
  • the analog front-end module receives the analog signal from the local receiving dedicated twisted pair port, completes the receiving filtering, variable gain amplification, discrete sampling and quantization of the received analog signal, converts the analog signal into a digital signal, and sends it to the digital signal.
  • the “discrete multi-tone processing module" in the “line-division duplex DSL access module” performs digital signal processing to complete demodulation of the digital multi-tone signal, and sends the demodulated link frame signal to the "line”
  • the "transport aggregation module” in the “duplex duplex DSL access module” completes the data format conversion and the traffic convergence, and then passes the "uplink interface module” in the "line-division duplex DSL access module” Local broadband application server output.
  • connection from the "line drive module” to the “analog front end module” implemented by the dedicated twisted pair as described herein does not specifically refer to the connection through the physical wires, but indicates that there is an electrical path that can send signals from one party to another.
  • One side including direct connections using physical metal lines, also includes signal transmission path connections through filters (shown in Figure 4), amplifiers, or other signal processing modules.
  • the limiting feature is only that the dedicated twisted pair is dedicated to signal transmission in one direction.

Abstract

本发明公开了一种线分双工xDSL宽带接入方法，在由"xDSL调制解调器"、连接"xDSL调制解调器"与"DSL接入模块"的"双绞线"和"DSL接入模块"组成的xDSL系统中，捆绑采用两对双绞线来传输xDSL信号，用所述两对双绞线中的一对双绞线联接传输从"DSL接入模块"中"线路驱动模块"输出发送至"xDSL调制解调器"中"模拟信号处理模块"的信号，用另一对双绞线联接传输从"xDSL调制解调器"中"模拟信号处理模块"输出发送至"DSL接入模块"中"模拟前端模块"的信号，用线分双工实现xDSL系统的全双工xDSL信号传输。

Description

支持线分双工的xDSL宽带接入方法与系统 技术领域
本发明属于一种用户终端访问通信服务网络的方法及其实现系统，尤其是一种增加上行数据传输速率的方法与系统。
背景技术
数字用户线（DSL）是以金属双绞线为传输介质的传输技术组合，它包括高速数字用户线（HDSL）、对称数字用户线（SDSL）、非对称数字用户线（ADSL）、速率自适应数据用户线（RADSL）、甚高速数字用户线（VDSL）和第2代甚高速数字用户线（VDSL2）等，一般通称为xDSL。
目前主流xDSL系统采用称为离散多音调制（DMT）的数字用户线技术。
所谓离散多音调制，其相关模块包括符号编解码器、时频域变换调制器两个部分，如ITU-T规范G.992.1中的图5和G.993.2中的图10所示。它先将待传输的数据比特流序列划分为短比特组，并指定每组比特调制DMT的特定子载波；再由格状编码器将每一个比特组编码映射到子载波信号星座的一个星座点上，成为该子载波的星座符号；所有子载波的星座符号集通过离散傅立叶逆变换（IDFT）映射到时域，形成时域抽样点序列；在对时域抽样点序列循环延伸并进行窗口处理后，成为输出的离散多音调制抽样信号。
对离散多音调制信号解调时，首先对DMT调制的时域抽样点序列进行窗口截取，然后对定长抽样序列进行离散傅立叶变换（通常采用FFT快速傅立叶变换实现），将调制信号还原到频域；再在频域将每个DMT子载波上的信号解码判决还原成比特组；最后根据双方约定的比特组到DMT子载波的映射方法，将比特组逆映射还原成数据比特流。
当前的xDSL宽带接入系统包括：属于用户驻地设备的“xDSL调制解调器”、连接“xDSL调制解调器”与“DSL接入模块”的“双绞线”、属于局端设备的“DSL接入模块”，如图1所示：现有技术中xDSL数字用户线宽带接入系统框图。其中核心设备为配置在用户住宅内的“xDSL调制解调器”和属于局端设备的“DSL接入模块”。
现有xDSL宽带接入系统均采用频分双工的全双工传输方式，在同一对双绞线上同时传输上行和下行信号。
“xDSL调制解调器”主要由“频分双工2-4线混合模块”、“模拟信号处理模块”、“数字信号处理模块”和“上行接口模块”四个模块组成。其中“频分双工2-4线混合模块”由一组电感电容滤波和阻抗匹配电路构成，也可以采用阻容有源滤波电路实现。“模拟信号处理模块”还可以进一步细分为“线路驱动模块”和“模拟前端模块”两个子模块。其中“模拟前端”包括数模转换（DAC）和模数转换（ADC）两部分。“数字信号处理模块”还可以进一步细分为“离散多音处理（DMT）模块”和“传输汇聚（TC）模块”两个子模块。其中“离散多音处理（DMT）模块”又可以细分为组帧和解帧，编码和解码，比特多音映射和逆映射，以及离散傅立叶变换和逆变换四个子模块。
在xDSL调制解调器接收方向，“频分双工2-4线混合模块”从收发共享的双绞线上分离出接收信号，送入“模拟信号处理模块”完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字采样信号，送给“数字信号处理模块”处理，在“数字信号处理模块”完成离散多音信号的解调，将解调出来的数据经解帧后进行去交织，RS解码和去扰码处理，得到的复合信号解封装后成原始数据信号，提交给网络“上行接口模块”，在网络“上行接口模块”再次封装成为适合本地网络传输的数据信号（通常为以太网）格式，提供给本地终端使用；在“xDSL调制解调器”发送方向，网络“上行接口模块”将本地终端送来的（通常是以太网格式）信号接收下来，送到“数字信号处理模块”，将有效数据取出复用成统一格式，然后经过扰码，RS编码和交织处理后送往成帧器复用成数据帧，再进行离散多音调制，调制后的信号送给“模拟信号处理模块”，将数字信号转换成为模拟波形信号，经过滤波放大处理以后，经“频分双工2-4线混合模块”输出到收发共用的双绞线上。
许多公司提供上述“xDSL调制解调器”中各模块的完整芯片组解决方案。例如提供“模拟信号处理模块”的芯片有：意法半导体公司的ST70138、ST20174，博通公司的BCM6529、BCM6306，艺传科技公司的MT3201、MT3301，美国模拟器件公司的AD6482、AD6483、AD6484，Lantiq公司的VRX208、PSB80170。提供“数字信号处理模块”的芯片有：美国模拟器件公司的AD6485、AD6486、AD6487，艺传科技公司的MT2201，意法半导体公司的ST20196、ST20184，Lantiq公司的VRX268、PSB80600、PSB80800，等。提供“xDSL调制解调器”中“上行接口模块”的芯片有瑞昱公司的RTL8201，LSI公司的AR229，英特尔公司的LXT972，Lantiq公司的PHY11G等。另外，德州仪器公司的AR7、UR8，博通公司的BCM6335、BCM6345、BCM6348、BCM6358、BCM6362、BCM6368，科圣讯公司的CX82310、CX82320、CX96220、CX96329、CX96429、CX96629，Ikanos公司的DA87781、FX10050S、FX100100S，创达特公司的TRI-VSP200等芯片同时实现了“模拟信号处理模块”、“数字信号处理模块”和“上行接口模块”。
标准柜式“DSL接入模块”由1块或多块“xDSL线卡板模块”和2块相互备份的“上行接口模块”组成，每块“xDSL线卡板模块”支持多路xDSL信号通道，“xDSL线卡板模块”和“上行接口模块”之间通过系统背板总线互联。小型“DSL接入模块”只需要1块“xDSL线卡板模块”和1个“上行接口模块”，可以将它们设计在同一块电路板上以缩减安装体积。
“DSL接入模块”中的“xDSL线卡板模块”主要由“频分双工2-4线混合模块”、“线路驱动模块”、“模拟前端模块”、“离散多音处理模块”、“传输汇聚模块”组成。这里以单路xDSL通道为例描述“DSL接入模块”的工作原理。在上行方向（“DSL接入模块”的接收方向），“频分双工2-4线混合模块”从收发共享的双绞线上分离出接收信号，送入“模拟前端模块”完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成多路xDSL链路的流量汇聚，再集中送到“上行接口模块”，封装成以太网帧格式输出。在下行方向（“DSL接入模块”的发送方向），“上行接口模块”将从以太网接口收到的外部有效载荷数据提取出来，送到“传输汇聚模块”，封装成链路帧信号，然后送到指定xDSL端口的“离散多音处理模块”，完成离散多音信号调制，调制后的信号送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，经“频分双工2-4线混合模块”输出到收发共用的双绞线上。
在上述“DSL接入模块”中，提供“线路驱动模块”的芯片有意法半导体公司的STLC60243，英飞凌公司的PEB22716，Lantiq公司的VINAX-L1/2，圣天公司的CT-L56AC02-QA，美国ADI公司的AD8018、AD8390、AD8398、AD8404，Intersil公司的ISL1535、ISL1539、ISL1557，提供“模拟前端模块”的芯片有博通公司的BCM6411/21、BCM6511/2、BCM6516，德州仪器公司的TNETD7112/3，科圣讯公司的，意法半导体公司的STLC60454，英飞凌公司的PEB22720、PEF55304,Lantiq公司的VINAX-A4/8，艺传公司的MT3301，圣天公司的CT-L56AC02-QA，提供“数字信号处理模块”的芯片有博通公司的BCM6410/6411、BCM6510、BCM6522/4/6，科圣讯公司的G24，意法半导体公司的STLC61265、STLC61266，英飞凌公司的PEF55016、PEF55506，Lantiq公司的VINAX-D4L/D8M，艺传公司的MT2301等，提供“传输汇聚模块”的芯片有阿吉尔公司的APP300、APP330,英飞凌公司的ConverGate CP4270等，此外艺传公司的MT5302芯片同时提高了“模拟前端模块”和“数字信号处理模块”的功能，创达特公司的TRI-VMPA800、VMPD1600和Ikanos公司的Velocity、AD11008、FX10050、FX100100同时提供了“线路驱动模块”、“模拟前端模块”和“数字信号处理模块”的功能。
最新公开的数字用户线技术是增强第二代ADSL技术（ADSL2+，G.992.5）和兼容ADSL2+的第二代VDSL技术（VDSL2，G.993.2）。近年来，随着宽带互联网技术和宽带业务的快速发展，宽带用户已逐步从高速上网的单一应用，向VoIP、IPTV、可视通信等综合应用发展，因此，对接入带宽将提出更高的要求。目前，电信运营商主要利用其丰富的铜线资源，采用ADSL/ADSL2+接入技术提供宽带接入。ADSL/ADSL2+的有效传输距离为5~6公里，ADSL下行速率最高为8Mbps，上行速率为640kbps，而ADSL2+下行速率最高为24Mbps，上行速率为1Mbps。VDSL2可以在300米范围内实现上行30Mbps/下行50Mbps的数据速率，但是到500米就锐减到上行10Mbps/下行30Mbps，到1000米时上行就只能达到1Mbps。从传输速率看，ADSL难以满足高带宽用户的接入要求，ADSL2+在近期内可以基本满足带宽需要，但上行带宽偏低，VDSL2在短距离性能良好，但是可以提供较高上行带宽的传输距离太短，不能满足实际通信业务的需要。
实际上ADSL/ADSL2+技术的上下行频谱的分配比较简单，从25KHz-138KHz的连续频段用于从“ADSL调制解调器”向“DSL接入模块”发送数据信号，从276KHz-1.1MHz/2.2MHz的连续频段用于从“DSL接入模块”向“ADSL调制解调器”发送数据信号。VDSL2技术的频谱分配比较复杂，有多个不连续的上行和下行频带段，且上下行的频段划分是交替连续的。由于不存在理想带通滤波器，交替连续的多个上下行频段划分方法不仅实现复杂，而且由于必须保留一定的保护带宽间隔，降低了频谱利用率。
ITU-T定义的带宽聚合技术（G.998.1/2/3）可以提高数据传输速率。带宽聚合又称信道捆绑或链接聚合，就是将两条或更多连接的带宽，提供给单独一条连接使用。该技术的优点是可显著提高数据传输速率，缺点是上下行带宽比例不可调、实现较复杂。
授权专利CN200580015585.3和CN200780041916.X公开了两种多环路DSL系统，通过矢量化信号传输来提高链路速率。但是提出的方法没有充分利用双绞线可以减轻线对间干扰的优点，因此要求较高的计算能力和较大的功耗。
临时保护专利200810019222.2提出了一种将两条电话线反向捆绑使用的方法和系统，然而该方法技术实现过于复杂，且仍然存在由于保护频带间隔而引起的频谱利用率问题。
本发明即是为了解决或部分解决现有技术所存在的上述问题之一。
 技术问题
为了概括本发明的目的，在这里描述了本发明的某些方面、优点和新颖特征。应了解，无需所有这些方面、优点和特征包含在任一特殊的实施例中。
本发明的目的是提供一种支持线分双工的xDSL数据传输方法与系统。
 技术解决方案
为实现上述目的，本发明的技术方案如下：
本发明的线分双工xDSL宽带接入方法是，由“xDSL调制解调器”、连接“xDSL调制解调器”与“DSL接入模块”的“双绞线”和“DSL接入模块”组成xDSL传输系统，其特征在于，新增一对双绞线与原有的一对双绞线捆绑用于传输xDSL信号，所述捆绑的两对双绞线之一用于连接传输从“DSL接入模块”中“线路驱动模块”输出并发送至“xDSL调制解调器”中“模拟信号处理模块”的xDSL信号，用所述捆绑的两对双绞线中的另一对连接传输从“xDSL调制解调器”中“模拟信号处理模块”输出并发送至“DSL接入模块”中“模拟前端模块”的xDSL信号，用线分双工方式实现xDSL系统的全双工xDSL信号传输。
本发明改进的xDSL宽带接入方法是，在用快速傅立叶变换技术实现离散多音调制和解调的有线数字通信系统中，捆绑采用两对双绞线来传输xDSL信号，其特征在于，相互通信的两个设备由“线路驱动模块”、“模拟前端模块”、“离散多音处理模块”、“传输汇聚模块”和“上行接口模块”组成。任何一方设备中的“上行接口模块”将从外部收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，通过一对专用的双绞线送至另一方设备中的“模拟前端模块”，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成xDSL链路的流量汇聚后，送到“上行接口模块”对外输出。用两对双绞线的线分双工方式实现全双工xDSL信号传输。
本发明还提出了一种线分双工xDSL调制解调器设备,包括：用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”、用于实现大动态范围线性功率放大的“线路驱动模块”和用于实现与本地终端互联的“上行接口模块”。一方面“上行接口模块”将从本地终端收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口；另一方面“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过“上行接口模块”向本地终端输出。
本发明还提出了一种线分双工DSL接入模块，包括：支持多路xDSL通路的“线分双工xDSL线卡板模块”和用于实现与本地宽带应用服务器互联的“上行接口模块”，“线分双工xDSL线卡板模块”又包括用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”和用于实现大动态范围线性功率放大的“线路驱动模块”。一方面“上行接口模块”将从本地宽带应用服务器收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口；另一方面“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过“上行接口模块”向本地宽带应用服务器输出。
本发明还提出了一种线分双工xDSL接入实现系统，包括：“xDSL调制解调器”、连接“xDSL调制解调器”与“DSL接入模块”的“双绞线”和“DSL接入模块”，其特征在于：所述“xDSL调制解调器”是本发明所述的“线分双工xDSL调制解调器”，所述“DSL接入模块”是本发明所述的“线分双工DSL接入模块”，并且对于连接所述“线分双工调制解调器”和所述的“线分双工DSL接入模块”的任何一路所述的“双绞线”均包括捆绑使用的两对双绞线，其中一对双绞线专用于传输从所述“线分双工xDSL调制解调器”发送至所述“线分双工DSL接入模块”的数据信号，另一对双绞线专用于传输从所述的“线分双工DSL接入模块”发送至所述“线分双工xDSL调制解调器”的数据信号。
本发明还提出了一种线分双工的VDSL宽带实现系统，包括：“VDSL2调制解调器”、连接“VDSL2调制解调器”与“DSL接入模块”中“VDSL2线卡板模块”的两对双绞线和包括“VDSL2线卡板模块”的“DSL接入模块”，其特征在于：所述“VDLS2调制解调器”是“线分双工VDSL2调制解调器”，所述“VDSL2线卡板模块”是“线分双工VDSL2线卡板模块”，所述两对双绞线，一对用来传输从所述“线分双工VDSL2调制解调器”到所述“DSL接入模块”中所述“线分双工VDSL2线卡板模块”的所谓上行数据，另一对用来传输从所述“DSL接入模块”中所述“线分双工VDSL2线卡板模块”到所述“线分双工VDSL2调制解调器”的所谓下行数据。
 有益效果
1、可以提高xDSL接入系统的数据传输速率
本发明采用两对双绞线分别专门传输上行和下行数据信号，每对双绞线均可以独占全部信道带宽，从而可以提高数据传输速率，尤其是上行链路传输速率的提高更加突出。即使对于已经进行了上下行频段划分的xDSL系统，由于上下行信号分开传输，减少了同一对双绞线上上下行信号之间的相互干扰，也可以提高总的数据传输速率。
2、简化了xDSL接入系统
本发明采用两对双绞线来分别传输上下行数据信号，无论是调制解调器端还是DSL接入模块端均可以使用技术要求较低的独立输入输出滤波器来取代“频分双工2-4线混合模块”，从而简化了系统设计，可以降低设备制造和维护成本。
3、便于进一步改进和提高系统性能
本发明采用线分双工实现“xDSL调制解调器”与“DSL接入模块”之间的全双工传输，任何一对双绞线上传输的信号对另一对双绞线没有影响，因此传统频分双工xDSL系统中复杂的频谱划分就不再是必须。可以取消上下行的频谱带宽限制，进一步增加传输带宽。同时，如果全球都不再设置不同的传输频段限制，就提高了产品在世界范围的兼容性。
4、应用前景广阔
本发明充分利用现有铜线资源，若将双绞线全部可用带宽分别用于传输上行和下行数据，将会成倍提高接入系统的数据传输速率，从而缓解当前普遍存在的接入网访问速度低的难题，满足各种高带宽网络应用需要，具有广泛的应用前景。
5、易于实施
本发明只需要对现有系统作极小改进，即采用独立的输入输出滤波器取代“xDSL调制解调器”和“DSL接入模块”中“xDSL线卡板模块”中的“频分双工2-4线混合模块”，增加一对双绞线并将两端的发送和接收端口通过两对双绞线分别交叉相连，即可实施。
本发明更好的实施与完善通常可以通过改进系统固件实现。
 附图说明
图1是现有技术中xDSL数字用户线宽带接入系统框图。
图2是本发明支持线分双工xDSL数字用户线的宽带接入系统框图。
图3是本发明线分双工xDSL数字用户线的宽带接入系统框图。
图4是本发明改进的线分双工xDSL数字用户线的宽带接入系统框图。
 本发明的实施方式
本发明的核心构思是在用快速傅立叶变换技术实现离散多音调制和解调的有线数字通信系统中，捆绑采用两对双绞线来传输xDSL信号，用两对双绞线的线分双工方式实现全双工xDSL信号传输。
下面结合附图和实施例对本发明做进一步描述。
第一实施例
本实施例的支持线分双工的xDSL宽带接入方法，是在原有xDSL系统中，增加3个联动开关和一对额外的双绞线来实现。如图2所示。
在“xDSL调制解调器”设备中，将原来连接“频分双工2-4线混合模块”和“模拟前端”中“A/D变换器”模拟输入端的一对信号线断开，插入一个双线双掷开关K1，常闭触点对1-2相连时，维持原来的频分双工工作模式。触点对3连接新增的双绞线。
在“DSL接入模块”设备的“线卡板模块”中，将原来连接“频分双工2-4线混合模块”和“模拟前端”中的“A/D变换器”模拟输入端的一对信号线断开，插入一个双线双掷开关K3，常闭触点对1-2相连时，维持原来的频分双工工作模式。触点对3直接连接原来的双绞线。
在“DSL接入模块”设备的“线卡板模块”原来连接双绞线的端口上，串联一个双刀双掷开关K2，常闭触点对1-2相连时，维持原来的电话线连接方式。触点对3连接到新增加的双绞线。
当需要改用线分双工工作模式时，将三个双刀双掷开关同时切换到触点对1-3相连，这时“xDSL调制解调器”中“线路驱动模块”输出的信号仍然可以通过“xDSL调制解调器”中的“频分双工2-4线混合模块”，在原来的电话线端口输出，经过双刀双掷开关K3的触点对3-1进入“DSL接入模块”中“xDSL线卡板模块”中“模拟前端模块”的“A/D变换器”模拟信号输入端。而从“DSL接入模块”中“xDSL线卡板模块”中“线路驱动模块”输出的信号也仍然可以通过“DSL接入模块”中“xDSL线卡板模块”中的“频分双工2-4线混合模块”，在原来的电话线端口输出至双刀双掷开关K2，经触点对1-3送入新增双绞线，最后从双刀双掷开关K1的触点对3-1送达“xDSL调制解调器”中“模拟前端模块”的“A/D变换器”模拟信号输入端。
有些“xDSL调制解调器”设备中，“频分双工2-4线混合模块”至“A/D变换器”的信号连接采用非平衡方式，因此只有1条信号线。这时用“xDSL调制解调器”设备中“模拟信号处理模块”的信号地线作为连接双刀双掷开关的另一根信号线。
有些“DSL接入模块”设备中“xDSL线卡板模块”的“频分双工2-4线混合模块”至“A/D变换器”的信号连接采用非平衡方式，因此只有1条信号线。这时用该“xDSL线卡板模块”中“模拟前端模块”的信号地线作为连接双刀双掷开关的另一根信号线。
如果不需要再支持原有的双工模式，可以省略掉双刀双掷开关，直接将原来接双刀双掷开关触点对1-3的双绞线直接互连。这样只需要对原有的数字用户线系统作极小的改动，就可以实施本发明的线分双工工作方式。
当采用线分双工模式工作时，实施例中所述的“xDSL调制解调器”设备和“DSL接入模块”设备中的“频分双工2-4线混合模块”实际上均只负责单个方向的信号传输，不再起频分双工滤波的作用。出于成本考虑可以简化甚至拆除“频分双工2-4线混合模块”，将输入和输出端口直接互联。
从成本考虑较佳的实施例（图3）拆除了所述的“xDSL调制解调器”设备和“DSL接入模块”设备中的“频分双工2-4线混合模块”。但是这种方法在通信线缆开通率较高时，有可能引起通信线缆中相邻双绞线链路相互干扰的增加。
较佳的改进方法如图4所示，将“频分双工2-4线混合模块”分拆成输出滤波器和输入滤波器，分别置于所述“xDSL调制解调器”设备和“DSL接入模块”设备的输出端和输入端。从而减轻成捆线缆中不同线路间的相互干扰。
出于性能和成本的综合考虑，不同准则下的较佳实施例可以单独保留输出滤波器或单独保留输入滤波器，也可以插入其他信号处理模块。
因此这里所述的通过专用双绞线实现从“线路驱动模块”至“模拟前端模块”的连接，并非特指通过物理导线的连接，而是表示存在一种电气通路可以将信号从一方送至另一方，包括了使用物理金属线的直接连接，也包括了通过滤波器、放大器或其他信号处理模块实现的信号传输通路连接。其限制特征仅仅在于所述该条专用的双绞线是专用于一个方向的信号传输。
第二实施例
本实施例的线分双工xDSL宽带接入方法如图3所示，是不使用“频分双工2-4线混合模块”的线分双工xDSL接入方法，其中一对双绞线专门传输上行方向的xDSL调制信号，另一对双绞线专门传输下行方向的xDSL调制信号。
实际上ITU-T规范定义的xDSL系统中的“频分双工2-4线混合模块”，由于人为限制了发送和接收信号的频段和频带宽度，不能充分发挥出双绞线的传输信道容量。拆除“xDSL调制解调器”设备和“DSL接入模块”设备中的“频分双工2-4线混合模块”，可以提高双绞线的频谱利用率。
从用户终端来的用户数据送达“xDSL调制解调器”后，“xDSL调制解调器”的“上行接口模块”将从外部收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，通过一对专用的双绞线送至“DSL接入模块”中“xDSL线卡板模块”的“模拟前端模块”，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成xDSL链路的流量汇聚后，送到“上行接口模块”，最后送达宽带应用服务器。
从宽带应用服务器中发出的数据送到“DSL接入模块”后，由“DSL接入模块”中的“上行接口模块”将从外部收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，通过一对专用的双绞线送至“xDSL调制解调器”的“模拟前端模块”，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成xDSL链路的流量汇聚后，送到“上行接口模块”，最后送达用户终端。
这里所述的通过专用双绞线实现从“线路驱动模块”至“模拟前端模块”的连接，并非特指通过物理导线的连接，而是表示存在一种电气通路可以将信号从一方送至另一方，包括了使用物理金属线的直接连接，也包括了通过滤波器、放大器或其他信号处理模块实现的信号传输通路连接。其限制特征仅仅在于所述该条专用的双绞线是专用于一个方向的信号传输。
本实施例在进行所述的离散多音调制时，可以参考ITU-T的xDSL规范建议，限定仅调制用于发送和接收的离散多音子载波，也可以不受规范束缚使用全部离散多音子载波。
优选的实施方案是在每个方向上使用全部可用的离散多音子载波。
第三实施例
本实施例的一种线分双工的VDSL宽带实现系统是将图3中线分双工的xDSL宽带实现系统中的“xDSL调制解调器”替换为“VDSL2调制解调器”、“xDSL线卡模块”替换为“VDSL2线卡模块”。所述的系统包括：“VDSL2调制解调器”、连接“VDSL2调制解调器”与“DSL接入模块”中“VDSL2线卡板模块”的两对双绞线和包括“VDSL2线卡板模块”的“DSL接入模块”，其中,所述“VDLS2调制解调器”是“线分双工VDSL2调制解调器”，所述“VDSL2线卡板模块”是“线分双工VDSL2线卡板模块”，所述两对双绞线，一对用来传输从所述“线分双工VDSL2调制解调器”到所述“DSL接入模块”中所述“线分双工VDSL2线卡板模块”的所谓上行数据，另一对用来传输从所述“DSL接入模块”中所述“线分双工VDSL2线卡板模块”到所述“线分双工VDSL2调制解调器”的所谓下行数据。
在本实施例中的线分双工VDSL2调制解调器，包括：用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”、用于实现大动态范围线性功率放大的“线路驱动模块”和用于实现与本地终端互联的“上行接口模块”。所述的“模拟前端模块”、“离散多音处理模块”、“传输汇聚模块”和“线路驱动模块”均符合ITU-T建议的VDSL2规范要求，可以使用市场成熟的VDSL2芯片组实现。
实施例中，一方面所述“线分双工VDSL2调制解调器”中的所述“上行接口模块”将从本地终端收到数据的有效载荷提取出来，送到所述“线分双工VDSL2调制解调器”中的所述“传输汇聚模块”，封装成链路帧信号后，送到所述“线分双工VDSL2调制解调器”中的所述“离散多音处理模块”，完成离散多音信号调制后，送给所述“线分双工VDSL2调制解调器”中的所述“模拟前端模块”，将数字信号转换成为模拟波形信号，经过所述“线分双工VDSL2调制解调器”中的所述“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口；另一方面所述“线分双工VDSL2调制解调器”中的所述“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到所述“线分双工VDSL2调制解调器”中的所述“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到所述“线分双工VDSL2调制解调器”中的所述“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过所述“线分双工VDSL2调制解调器”中的所述“上行接口模块”向本地终端输出。
在本实施例中的线分双工DSL接入模块，包括：支持多路VDSL通路的“线分双工VDSL2线卡板模块”和用于实现与本地宽带应用服务器互联的“上行接口模块”，“线分双工VDSL2线卡板模块”又包括用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”和用于实现大动态范围线性功率放大的“线路驱动模块”。所述的“模拟前端模块”、“离散多音处理模块”、“传输汇聚模块”和“线路驱动模块”均符合ITU-T建议的VDSL2规范要求，可以使用市场成熟的VDSL2芯片组实现。
本实施例优选的改进方案，通过在标准VDSL2芯片组中，升级调整“离散多音处理模块”中的嵌入式软件，可以在上行和下行的每个方向上使用全部可用多音子载波，从而可以大幅提高上下行的传输带宽，尤其是长距离情况下的上行带宽。
实施例中，一方面所述“线分双工DSL接入模块”中的所述“上行接口模块”将从本地宽带应用服务器收到数据的有效载荷提取出来，送到所述“线分双工DSL接入模块”中的所述“传输汇聚模块”，封装成链路帧信号后，送到所述“线分双工DSL接入模块”中的所述“离散多音处理模块”，完成离散多音信号调制后，送给所述“线分双工DSL接入模块”中的所述“模拟前端模块”，将数字信号转换成为模拟波形信号，经过所述“线分双工DSL接入模块”中的所述“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口；另一方面所述“线分双工DSL接入模块”中的所述“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到所述“线分双工DSL接入模块”中的所述“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到所述“线分双工DSL接入模块”中的所述“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过所述“线分双工DSL接入模块”中的所述“上行接口模块”向本地宽带应用服务器输出。
这里所述的通过专用双绞线实现从“线路驱动模块”至“模拟前端模块”的连接，并非特指通过物理导线的连接，而是表示存在一种电气通路可以将信号从一方送至另一方，包括了使用物理金属线的直接连接，也包括了通过滤波器（图4所示）、放大器或其他信号处理模块实现的信号传输通路连接。其限制特征仅仅在于所述该条专用的双绞线是专用于一个方向的信号传输。
虽然本发明已以较佳实施例公开如上，但它们并不是用来限定本发明，任何熟习此技艺者，在不脱离本发明之精神和范围内，自当可作各种变化或润饰，因此本发明的保护范围应当以本申请的权利要求保护范围所界定的为准。

Claims (7)

  1. 一种xDSL宽带接入方法，由“xDSL调制解调器”、连接“xDSL调制解调器”与“DSL接入模块”的“双绞线”和“DSL接入模块”组成xDSL系统，其特征在于，
    新增一对双绞线与原有的一对双绞线捆绑用于传输xDSL信号，
    “DSL接入模块”中“线路驱动模块”输出的发送信号通过一对双绞线传送至“xDSL调制解调器”中“模拟信号处理模块”的接收信号端，
    “xDSL调制解调器”中“模拟信号处理模块”输出的发送信号通过另一对双绞线传送至局端“DSL接入模块”中“模拟前端模块”的接收信号端，
    用线分双工方式实现xDSL系统的全双工xDSL信号传输。
  2. 根据权利要求1所述的xDSL宽带接入方法，其特征还在于,所述xDSL系统是采用快速傅立叶变换技术实现离散多音调制和解调的有线数字通信系统。
  3. 根据权利要求2所述的xDSL宽带接入方法，其特征还在于,
    相互通信的两个设备分别对应由“线路驱动模块”、“模拟前端模块”、“离散多音处理模块”、“传输汇聚模块”和“上行接口模块”组成，
    任何一方设备中的“上行接口模块”将从外部收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，通过一对专用的双绞线送至另一方设备中的“模拟前端模块”，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成xDSL链路的流量汇聚后，送到“上行接口模块”对外输出。
  4. 一种线分双工xDSL调制解调器,包括：用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”、用于实现大动态范围线性功率放大的“线路驱动模块”和用于实现与本地终端互联的“上行接口模块”，其特征在于，
    一方面所述“上行接口模块”将从本地终端收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口，
    另一方面所述“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过“上行接口模块”向本地终端输出。
  5. 一种线分双工DSL接入模块，包括：支持多路xDSL通路的“线分双工xDSL线卡板模块”和用于实现与本地宽带应用服务器互联的“上行接口模块”，“线分双工xDSL线卡板模块”又包括用于实现数模转换（DAC）和模数转换（ADC）的“模拟前端模块”、用于实现离散多音调制和解调的“离散多音（DMT）处理模块”、用于实现数据格式转换和多路流量汇聚的“传输汇聚模块”和用于实现大动态范围线性功率放大的“线路驱动模块”，其特征在于，
    一方面所述“上行接口模块”将从本地宽带应用服务器收到数据的有效载荷提取出来，送到“传输汇聚模块”，封装成链路帧信号后，送到“离散多音处理模块”，完成离散多音信号调制后，送给“模拟前端模块”，将数字信号转换成为模拟波形信号，经过“线路驱动模块”的滤波放大处理以后，送到本地发送专用的双绞线端口，
    另一方面所述“模拟前端模块”从本地接收专用的双绞线端口接收到模拟信号后，完成对接收模拟信号的接收滤波、可变增益放大、离散采样和量化，将模拟信号转换成为数字信号，再送到“离散多音处理模块”进行数字信号处理，完成数字多音信号的解调，将解调出来的链路帧信号送到“传输汇聚模块”，完成数据格式转换和流量汇聚后，通过“上行接口模块”向本地宽带应用服务器输出。
  6. 一种线分双工xDSL接入实现系统，包括：“xDSL调制解调器”、连接“xDSL调制解调器”与“DSL接入模块”的“双绞线”和“DSL接入模块”，其特征在于,
    所述“xDSL调制解调器”是权利要求4所述的“线分双工xDSL调制解调器”，所述“DSL接入模块”是权利要求5所述的“线分双工DSL接入模块”，并且对于连接所述“线分双工调制解调器”和所述的“线分双工DSL接入模块”的任何一路所述的“双绞线”均包括捆绑使用的两对双绞线，
    其中一对双绞线专用于传输从所述“线分双工xDSL调制解调器”发送至所述“线分双工DSL接入模块”的数据信号，
    另一对双绞线专用于传输从所述“线分双工DSL接入模块”发送至所述“线分双工xDSL调制解调器”的数据信号。
  7. 根据权利要求6所述的线分双工xDSL接入实现系统，其特征还在于：所述“线分双工xDSL调制解调器”是“线分双工VDSL2调制解调器”，所述“线分双工xDSL线卡板模块”是“线分双工VDSL2线卡板模块”。
PCT/CN2011/079462 2010-09-21 2011-09-08 支持线分双工的xDSL宽带接入方法与系统 WO2012037851A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010102880737A CN101945029B (zh) 2010-09-21 2010-09-21 支持线分双工的xDSL宽带接入方法与系统
CN201010288073.7 2010-09-21

Publications (1)

Publication Number Publication Date
WO2012037851A1 true WO2012037851A1 (zh) 2012-03-29

Family

ID=43436812

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/079462 WO2012037851A1 (zh) 2010-09-21 2011-09-08 支持线分双工的xDSL宽带接入方法与系统

Country Status (2)

Country Link
CN (1) CN101945029B (zh)
WO (1) WO2012037851A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112602291A (zh) * 2018-08-27 2021-04-02 华为技术有限公司 通信装置及其系统、方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101945029B (zh) * 2010-09-21 2012-03-28 南京大学 支持线分双工的xDSL宽带接入方法与系统
WO2019151528A1 (ja) * 2018-02-05 2019-08-08 株式会社村田製作所 高周波フロントエンドモジュールおよび通信装置
CN110166329A (zh) * 2018-02-13 2019-08-23 华为技术有限公司 一种通信方法、装置及系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1859585A (zh) * 2005-12-30 2006-11-08 华为技术有限公司 宽带用户接入处理方法和设备及用户接口板
US20070041314A1 (en) * 2005-08-18 2007-02-22 Raanan Levi Apparatus and method for auto-negotiation in a communcation system
CN101068117A (zh) * 2006-04-19 2007-11-07 美国博通公司 一种有线通信方法和系统
CN101945029A (zh) * 2010-09-21 2011-01-12 南京大学 支持线分双工的xDSL宽带接入方法与系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070041314A1 (en) * 2005-08-18 2007-02-22 Raanan Levi Apparatus and method for auto-negotiation in a communcation system
CN1859585A (zh) * 2005-12-30 2006-11-08 华为技术有限公司 宽带用户接入处理方法和设备及用户接口板
CN101068117A (zh) * 2006-04-19 2007-11-07 美国博通公司 一种有线通信方法和系统
CN101945029A (zh) * 2010-09-21 2011-01-12 南京大学 支持线分双工的xDSL宽带接入方法与系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112602291A (zh) * 2018-08-27 2021-04-02 华为技术有限公司 通信装置及其系统、方法

Also Published As

Publication number Publication date
CN101945029B (zh) 2012-03-28
CN101945029A (zh) 2011-01-12

Similar Documents

Publication Publication Date Title
EP1197064B9 (en) Adsl system for transmission of voice and data signals
US6295343B1 (en) Method and apparatus for combining voice line card and xDSL line card functions
AU2007308107B2 (en) High speed multiple user multiple loop DSL system
US8854941B2 (en) Vectored DSL crosstalk cancellation
US6466088B1 (en) Method and apparatus for multi-channel X-DSL line driver
JP2011512711A (ja) 可変アップロード／ダウンロード・ビットレートを有し、特定用途のための動的なプロファイル切換えが行われるｄｓｌ方式
WO2013130647A1 (en) Passive optical network digital subscriber line convergence architecture
WO2012037851A1 (zh) 支持线分双工的xDSL宽带接入方法与系统
US6704324B1 (en) Apparatus and method for transmission of voice band signals over a DSL line
CN100484123C (zh) 一种数字用户线接入复用设备和信号传输方法
US6922415B1 (en) Apparatus and method for a non-symmetrical half-duplex DSL modem
US20070014306A1 (en) Remote digital subscriber line access multiplexer
Chow et al. A multi-drop in-house ADSL distribution network
US20050213648A1 (en) Symmetric ADSL communication
US7092412B1 (en) Method and apparatus for long haul high speed data transmission over XDSL pseudo channels
US20080165950A1 (en) Switchable transmission device for VDSL CO/CPE circuit
Cisco Digital Subscriber Line
CN101335738B (zh) 非对称数字用户线带宽聚合方法
WO2014148774A1 (ko) 인터넷과 일반전화를 동시에 제공하는 시스템
US20070153835A1 (en) Providing High Data Rates in DSL Systems Connected by Multiple Pairs of Wires
EP2245845B1 (en) Communicating signals through two twisted pairs
US7075998B1 (en) Method and apparatus for symmetrical DMT X-DSL communications
TW567697B (en) Long-distance network transmission architecture and related devices thereof
US8514917B1 (en) Method and apparatus for DSL communication over a 4 wire system
Jackson ADSL for high-speed broadband data service

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11826378

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11826378

Country of ref document: EP

Kind code of ref document: A1