WO2004004299A1 - xDSL中継機器及び通信システム - Google Patents
xDSL中継機器及び通信システム Download PDFInfo
- Publication number
- WO2004004299A1 WO2004004299A1 PCT/JP2002/006626 JP0206626W WO2004004299A1 WO 2004004299 A1 WO2004004299 A1 WO 2004004299A1 JP 0206626 W JP0206626 W JP 0206626W WO 2004004299 A1 WO2004004299 A1 WO 2004004299A1
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- WO
- WIPO (PCT)
- Prior art keywords
- analog
- signal
- transmission
- line
- frequency band
- Prior art date
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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
Definitions
- the present invention relates to an xDSL relay device and a communication system.
- the present invention relates to an xDSL relay device that relays an analog line on which communication by xDSL is performed.
- AD SL Asymmetrical Digital Subscriber Line
- VD SL Veryhighbitrate Digital Subscriber Line
- VDSL With VDSL, the maximum transmission speed can be increased to about 50 Mbps, and it can be realized using the existing telephone line, so that it can be used for Fiber To The Home (FTTH) using optical fiber. In comparison, installation and construction costs can be significantly reduced.
- FTTH Fiber To The Home
- the maximum transmission distance is about 1.5 km, and although the transmission speed can be increased, there is a problem that long-distance transmission cannot be performed.
- an object of the present invention is to provide an xDSL relay apparatus and a communication system that can solve the above-mentioned problems. This object is achieved by a combination of the features described in the independent claims. In addition, the dependent claims Some advantageous examples are defined. Disclosure of the invention
- an xDSL relay device for relaying between a first analog line and a second analog line, wherein A first analog signal that is connected and transmits an analog signal of a first frequency band to a first analog line and receives an analog signal of a second frequency band higher than the first frequency band from the first analog line A second analog transmission / reception unit connected to the transmission / reception unit and connected to the second analog line for transmitting an analog signal of the second frequency band to the second analog line and receiving an analog signal of the first frequency band from the second analog line And a relay unit that is connected to the first analog transmission / reception unit and the second analog transmission / reception unit, and relays communication between the first analog transmission / reception unit and the second analog transmission / reception unit.
- the first analog transmission / reception unit is configured to separate a transmission signal and a reception signal superimposed on the first analog line into a first combining / separating circuit unit and an analog signal acquired from the first combining / separating circuit unit.
- a first AD converter that converts the digital signal into a digital signal and supplies it to the relay unit; and a first IDA converter that converts the digital signal acquired from the relay unit into an analog signal and supplies the analog signal to the first combining / separating circuit unit.
- the second analog transmission / reception unit separates a transmission signal and a reception signal superimposed on the second analog line from each other, and converts the analog signal acquired from the second synthesis / separation circuit into a digital signal.
- a second A / D converter that supplies a digital signal obtained from the relay unit to an analog signal and supplies the analog signal to the second synthesis / separation circuit unit.
- a plurality of first analog transmission / reception units and a plurality of second analog transmission / reception units are provided, and the relay unit controls routing between each of the plurality of first analog transmission / reception units and the plurality of second analog transmission / reception units. May be.
- the first analog transceiver transmits an analog signal of a first partial band of the first frequency band, and an analog signal of a second partial band of the second frequency band.
- the second analog transmission / reception section transmits the data received by the first analog transmission / reception section using the second partial band as an analog signal of a third partial band of the second frequency band.
- the analog transmission / reception unit may be mounted on a different circuit board.
- the circuit board on which the second analog transmission / reception unit is mounted may be alternately arranged.
- a power supply unit for supplying power to the first analog transmission / reception unit and the second analog transmission / reception unit, and a first noise filter provided between the power supply and the first analog transmission / reception unit may be further provided.
- a second noise filter provided between the power supply and the second analog transmission / reception unit may be further provided.
- An analog signal that is provided on the wiring connecting the first analog line and the second analog line, reduces the high-frequency component of the analog signal flowing through the first analog line, supplies it to the second analog line, and flows through the second analog line And a low-pass filter for reducing the high-frequency component and supplying the low-frequency component to the first analog line.
- a first splitter provided between the first analog line and the first analog transmission / reception unit; and a second splitter provided between the second analog line and the second analog transmission / reception unit, wherein the first splitter is provided. Extracts an analog signal in a third frequency band lower than the second frequency band from an analog signal obtained via the first analog line, and transmits the analog signal in the second frequency band to the first analog transmitting / receiving section.
- the analog signal of the third frequency band is supplied to the second splitter, and the analog signal transmitted by the first analog transmitting / receiving section is converted to the analog signal acquired from the second splitter.
- the second splitter extracts the analog signal in the third frequency band lower than the first frequency band from the analog signal obtained through the second analog circuit.
- the analog signal of the first frequency band is supplied to the second analog transmitting / receiving section, the analog signal of the third frequency band is supplied to the first splitter, and the analog signal transmitted by the second analog transmitting / receiving section
- the analog signal obtained from the splitter may be combined and output to the second analog line.
- the digital transmission / reception unit is further connected to the digital line and transmits / receives a digital signal
- the relay unit is further connected to the digital transmission / reception unit and relays communication between the first analog transmission / reception unit and the digital transmission / reception unit. You may.
- an xDSL concentrator that converts a received digital signal into an analog signal and outputs the analog signal, and an analog signal output from the XDSL concentrator received from a first analog line and a second analog
- An XDSL relay device for outputting to a line
- an XDSL converter for converting an analog signal output from the XDSL relay device to a digital signal and transmitting the digital signal to a user terminal.
- the XDSL relay device is connected to a first analog line, A first analog transmission / reception unit that transmits an analog signal of the first frequency band to the first analog line and receives an analog signal of a second frequency band higher than the first frequency band from the first analog line; Connected to the analog circuit, transmits the analog signal in the second frequency band to the second analog circuit, and converts the analog signal in the first frequency band to the second analog circuit. Communication between the first analog transceiver and the second analog transceiver, which is connected to the second analog transceiver and the first analog transceiver and the second analog transceiver that receives from the analog line And a relay section for relaying the same.
- FIG. 1 shows an example of a configuration of a communication system 10 according to an embodiment of the present invention.
- FIG. 2 shows an example of a configuration of the VDSL relay device 100a according to the present embodiment.
- FIG. 3 shows an example of a frequency band used by the analog transmitting / receiving section 102a and the analog transmitting / receiving section 102b.
- FIG. 1 shows an example of a configuration of a communication system 10 according to an embodiment of the present invention.
- the communication system 10 realizes long-distance transmission using VDSL relay equipment that relays between analog lines in a VDSL that realizes high-speed transmission using an analog line such as a telephone line.
- the communication system 10 includes a router 30 connected to the Internet 20, a router 30, and a PSTN (Publi c Sw Sw t t c h e d T e l e p h o n e
- V DSL concentrator 50 connected to PC 40 a to 60 d and a plurality of VDSL converters 80 a to 80 d connected to PCs 60 a to 60 d and telephones 70 a to 70 d, respectively.
- the VDSL concentrator 50 is an example of the xDSL concentrator of the present invention
- the VDSL converters 80a to 80d are examples of the xDSL converter of the present invention
- the PCs 60a to 60d are examples of the user terminal of the present invention.
- VD SL Concentrator 50 is a digital line such as an Ethernet cable It is connected to the router 30 via 32, converts a digital signal received from the router 30 into an analog signal, and transmits the analog signal to the VDSL converters 80a to 80d. At this time, the VDSL concentrator 50 transmits an analog signal to the VDSL converters 80a to 80d using, for example, a band of 900 kHz to 3.5 MHz.
- the VDSL concentrator 50 transmits the analog signal received from the PSTN 40 via the analog line 42 such as a telephone line to the VDSL converters 80a to 80d. At this time, the VDSL concentrator 50 transmits an analog signal to the VDSL converters 80a to 80d using, for example, a band of 4 kHz or less.
- the VDSL concentrator 50 receives a VDSL converter 80a to 80d power, for example, an analog signal in a band of 4 kHz or less, and an analog signal in a band of 4.3MHz to 7.9MHz. I do.
- the VDS L concentrator 50 separates the analog signal of the band of 4 kHz or less from the analog signal of the band of 4.3 MHz to 7.9 MHz and separates the analog signal of the band of 4 kHz or less.
- the signal is transmitted to the PSTN 40, and the analog signal in the band of 4.3 MHz to 7.9 MHz is converted into a digital signal and transmitted to the router 30.
- the VDSL converters 80a to 80d are connected to the VDSL concentrator 50 via the VDSL relay devices 100a to 100d and the analog lines 52a to 52m.
- the VDSL converters 80a to 80d receive, for example, analog signals in a band of 4 kHz or less and analog signals in a band of 900 kHz to 3.5 MHz from the VDS L concentrator 50. .
- the VDSL converter 80a to 80d separates the analog signal in the band of 4 kHz or less from the analog signal in the band of 900 kHz to 3.5 MHz, and The analog signal in the band is transmitted to the telephones 70a to 70d, the analog signal in the 900kHz to 3.5MHz band is converted to a digital signal, and transmitted to the PCs 60a to 60d.
- the VDSL converters 80a to 80d are used to TJP2002 / 006626
- the analog signal received from the PC 60 a to 60 d is transmitted to the VDSL concentrator 50 via the digital line 82 a to 82 d.
- the VDSL converters 80a to 80d transmit analog signals to the VDSL concentrator 50 using, for example, a band of 4 kHz or less.
- the VDSL converters 80a to 80d transmit analog signals received from the telephone sets 70a to 70d to the VDSL concentrator 50 via analog lines 84a to 84d such as telephone lines. At this time, the VDSL converters 80a to 80d transmit analog signals to the VDSL concentrator 50 using, for example, a band of 4 kHz or less.
- VDSL relay device 100a-: 100d is connected to one of VDSL concentrator 50 and VDSL converter 80a-80d via analog line 52a-52m.
- the VDS L relay devices 100a to 100d may be connected in a daisy chain or may be connected in a tree.
- the VDSL relay devices 100a to 100d transmit the analog signals received from the VDSL concentrator 50 to the VDSL converters 80a to 80c. At this time, the VDSL relay devices 100a to 100d transmit analog signals to the VDSL converters 80a to 80c using, for example, a band of 900 kHz to 3.5 MHz. . Further, the VDSL relay devices 100a to 100d transmit the analog signals received from the VDSL converters 80a to 80c to the VDSL concentrator 50 side. At this time, the VDSL relay devices 100a to 100d transmit analog signals to the VDSL converters 80a to 80c using, for example, a band of 4.3 MHz to 7.9 MHz. .
- VD SL relay device 100a to 100d is directly connected to a PC via a digital line such as an Ethernet cable, and converts an analog signal received from the VD SL concentrator 50 into a digital signal to the PC.
- the digital signal transmitted and received from the PC may be converted into an analog signal and transmitted to the VDSL concentrator 50.
- VD SL relay device 100a is a digital line 6 2 02006626
- the VDSL relay device 100a converts an analog signal received from the VDSL relay device 100b via the analog line 52b or 52e into a digital signal, and transmits the digital signal to the PC 60e via the digital line 62.
- the VDSL relay devices 100a to 100d may be connected to an access point of a wireless LAN via a digital line such as an Ethernet cable. Then, the VDSL relay devices 100a to 100d may transmit a digital signal to a portable PC via a digital line and an access point.
- the VDSL relay devices 100a to 100d may have a routing function such as a spanning tree function, and may dynamically change the transmission destination.
- the VDSL relay device 100a may output the analog signal received via the analog line 52a to the analog line 52b or the analog line 52e, It may be output to digital line 62.
- the VDSL relay apparatus 100a transmits the analog signal to be transmitted to the VDSL converter 80a and the analog signal to be transmitted to the VDSL converter 80b.
- the signal may be output to an analog line 52 e.
- the VD SL relay devices 100a to 100d have an Ethernet layer 2 'switch function for realizing forwarding based on MAC address learning, and can acquire data acquired from analog lines and digital lines. The data may be output to an analog or digital line corresponding to the destination MAC address of the data.
- the VD SL concentrator 50, the VD SL converter 80a to 80d, and the VD SL relay device 100a to 100d are each assigned an IP address, and the I CMP (Internet Control Message Protocol) The function of 1) may be implemented. This allows the use of PCs 60a to 60e As a result, a diagnostic test can be performed for failures of the VDSL concentrator 50, the VDSL converters 80a to 80d, and the VDSL relay devices 100a to 100d. By installing 00d and relaying an analog line, long-distance transmission can be realized using VDSL, which is capable of high-speed transmission.
- FIG. 2 shows an example of the configuration of the VDSL relay device 100a according to the present embodiment. .
- the VDSL relay devices 100b to 100d also have the same configuration as the VDSL relay device 100a.
- the VD SL relay device 100a is connected to the analog line 52a, and transmits an analog signal of a first frequency band (for example, 900 kHz to 3.5MHz) to the analog line 52a.
- An analog signal transmitting / receiving unit 102a for receiving an analog signal of a second frequency band higher than the frequency band (for example, 4.3 MHz to 7.9 MHz) from the analog line, and an analog line 52b connected to the An analog signal transmitting / receiving section 102b for transmitting an analog signal of the second frequency band to the analog line 52b and receiving an analog signal of the first frequency band from the analog line 52b, and an analog transmitting / receiving section 102a.
- a relay section 104 for relaying communication between the analog transmission / reception section 102b and a demodulation circuit 1 18a for demodulating a digital signal acquired from the analog transmission / reception section 102a and supplying the demodulated digital signal to the relay section 104;
- the digital signal obtained from the relay unit 104 is converted to the first frequency band.
- Modulated and supplied to the analog transceiver unit 1 02 a A demodulation circuit 120b that demodulates the digital signal acquired by the analog transmission / reception unit 102b and supplies the demodulated signal to the relay unit 104, and a digital signal acquired from the relay unit 104
- a modulation circuit 120b that modulates the signal in the second frequency band and supplies the modulated signal to the analog transmission / reception unit 102b.
- the analog transmission / reception unit 102 a includes a hybrid circuit 1 1 a, which is an example of a first combining / separating circuit that combines and separates a transmission signal and a reception signal superimposed on the analog circuit 52 a, and a hybrid circuit 1
- An amplifier circuit amplifies the analog signal of the second frequency band obtained from 12a, and an analog signal amplified by the amplifier circuit is converted into a digital signal to demodulate the signal.
- AD converter 1 16a to be supplied to a, DA converter 1 2 2a for converting the digital signal modulated by the modulation circuit 120a into an analog signal, and analog signal converted by the DA converter 122a
- an amplifying circuit 124a that amplifies the signal and supplies it to the hybrid circuit 112a.
- the analog transmission / reception unit 102 b includes a hybrid circuit 1 1 2 b, which is an example of a first combining / separating circuit that combines and separates a transmission signal and a reception signal superimposed on the analog line 52 b, and a hybrid circuit 1.
- the VDSL relay device 100a includes a power supply unit 106 that supplies power to analog circuits such as the analog transmission / reception units 102a and 102b, a power supply unit 106, and an analog transmission / reception unit.
- a noise filter 108a provided between the power supply unit 106 and the analog transmission / reception unit 102b is provided.
- the noise filters 108a and 108b reduce electrical noise between the analog transmitting / receiving unit 102a and the analog transmitting / receiving unit 102b. That is, analog transmission Interference between the hybrid circuit 112a and the hybrid circuit 112b via wiring connected to the receiving section 102a and the analog transmitting / receiving section 102 can be reduced.
- the receiving frequency of the analog transmitting / receiving unit 102'a is the same as the transmitting frequency of the analog transmitting / receiving unit 102b, or the transmitting frequency of the analog transmitting / receiving unit 102a and the receiving frequency of the analog transmitting / receiving unit 102b.
- the noise filters 108a and 108b provide the effect that the analog transceivers 102a and 102b have on each other.
- the power supply unit 106 can supply power to digital circuits such as the modulation circuits 120a and 120b and the demodulation circuits 118a and 118b. Good.
- the power supply unit 106 is connected to the analog circuit and the digital circuit of the plurality of circuit boards from the outside of the circuit board, respectively, and supplies power to each of the analog circuit and the digital circuit mounted on the circuit board. Is also good.
- the power supply unit 106 is connected to a plurality of circuit boards from the outside of the circuit board to supply digital power to digital circuits mounted on the circuit board, and to provide noise to analog circuits mounted on the circuit board. Analog power may be supplied via the filter 108a or 108b.
- the VDSL relay device 100a includes a splitter 1226a provided between the analog line 52a and the analog transmission / reception unit 102a, an analog line 52b and an analog transmission / reception unit '110. 2 and a splitter 1 26 b provided between the two.
- the splitter 1 26a is configured to convert the analog signal obtained through the analog circuit 52a into a third frequency band lower than the second frequency band (for example, a frequency band of a voice call of 4 kHz or less). To extract the analog signal. Then, the splitter 126a supplies the analog signal of the second frequency band to the analog transmission / reception unit 102a, and supplies the analog signal of the third frequency band to the splitter 126b. Also, the splitter 126a is the first frequency band transmitted by the analog transceiver 102a. 02 006626
- the splitter 126a combines and separates an analog signal from data communication and an analog signal from voice communication.
- the splitter 126b extracts an analog signal of a third frequency band lower than the first frequency band from the analog signal obtained via the analog line 52b. Then, the splitter 126b supplies the analog signal of the first frequency band to the analog transmitting / receiving unit 102b, and supplies the analog signal of the third frequency band to the splitter 126a. Further, the splitter 126b combines the analog signal of the second frequency band transmitted by the analog transmitting / receiving section 102b with the analog signal of the third frequency band obtained from the splitter 126a. Output to analog line 52b. That is, the splitter 126b combines and separates an analog signal from data communication and an analog signal from voice communication.
- the splitters 1 26 a and 1 26 b are examples of a low-pass filter, and are provided on a line connecting the analog line 52 a and the analog line 52 b, and the analog current flowing through the analog line 52 a is provided.
- the high frequency component of the signal is reduced and supplied to the analog line 52b, and the high frequency component of the analog signal flowing through the analog line 52b is reduced and supplied to the analog line 52a.
- the analog signal in the third frequency band received via the analog line 52a or 52b is provided. That is, it is possible to transmit an analog signal from a voice call from the analog line 52b or 52a without converting it into a digital signal. Therefore, real-time performance in voice communication can be ensured.
- the VDSL relay device 100a is connected to a digital circuit such as an Ethernet cable, and has the same configuration as a digital transmitting / receiving unit 110 for transmitting / receiving digital signals and an analog transmitting / receiving unit 102a.
- a plurality of analog transmitting / receiving sections 102 c and a plurality of analog transmitting / receiving sections 1 having the same configuration as the analog transmitting / receiving section 102 b 06626
- the relay unit 104 controls the routing between each of the plurality of analog transmission / reception units 102 a to 102 d.
- the relay unit 104 supplies the data obtained by the analog transmitting / receiving unit 102 a as an analog signal in the second frequency band to the analog transmitting / receiving unit 102 c, and the analog transmitting / receiving unit 102 c
- the data acquired from the unit 104 may be transmitted as an analog signal in the second frequency band.
- the relay unit 104 supplies the data obtained by the analog transmission / reception unit 102 a with the analog signal of the second frequency band to the analog transmission / reception unit 102 d, and the analog transmission / reception unit 102 d
- the data obtained from the relay unit 104 is transmitted as an analog signal in the first frequency band.
- the relay unit 104 is connected to the digital transmission / reception unit 110, and the analog transmission / reception units 102 a to 1 It relays communication between 0 2 d and the digital transmission / reception unit 110 to control routing.
- the VDSL relay device 100a may include a plurality of digital transmission / reception units 110. In this case, the relay unit 110 may relay the communication between the plurality of digital transmission / reception units 110 and control the routing.
- the VDSL relay device 100a includes a circuit board 128 on which the analog transmitting / receiving section 102a is mounted and a circuit board 128b on which the analog transmitting / receiving section 102b is mounted. It is preferable that the analog transmission / reception unit 102 a and the analog transmission / reception unit 102 b are provided separately on different circuit boards.
- the plurality of analog transmitting / receiving sections 102 c having the same configuration as the analog transmitting / receiving section 102 a are preferably provided on different circuit boards, respectively, and are the same as the analog transmitting / receiving section 102 b. It is preferable that the plurality of analog transmission / reception units 102 d having the above configuration be provided on different circuit boards. Further, it is preferable that the circuit board on which the analog transmitting / receiving section 102 c is mounted and the circuit board on which the analog transmitting / receiving section 102 d is mounted are alternately arranged.
- the reception frequency of the analog transmission / reception unit 102 a is reduced. Even if the number and the transmission frequency of the analog transmission / reception unit 102b are the same, or the transmission frequency of the analog transmission / reception unit 102a and the reception frequency of the analog transmission / reception unit 102b are the same, the hybrid circuit 1 1 2a Interference with the hybrid circuit 1 1 2b can be reduced.
- FIG. 3 shows an example of a frequency band used by the analog transmitting / receiving section 102a and the analog transmitting / receiving section 102b.
- the frequency band of the analog signal received by the analog transmission / reception unit 102a may be different from the frequency band of the analog signal transmitted by the analog transmission / reception unit 102b, and the analog signal transmitted by the analog transmission / reception unit 102a may be different. And the frequency band of the analog signal received by the analog transmission / reception unit 102b may be different. That is, the demodulation frequency of the demodulation circuit 118a and the modulation frequency of the modulation circuit 120b may be different, and the demodulation frequency of the demodulation circuit 118b and the modulation frequency of the modulation circuit 120a may be different. , May be different.
- the analog transmitting / receiving section 102a transmits an analog signal of the first partial frequency band 202 of the first frequency band 200, and transmits the analog signal of the second partial band of the second frequency band 300. Receives analog signals in frequency band 302. Further, the analog transmitting / receiving section 102b transmits an analog signal of the third partial frequency band 304 of the second frequency band 300, and transmits an analog signal of the fourth partial frequency band 204 of the first frequency band 200. Receive the signal.
- the analog transmission / reception unit 102a transmits an analog signal in a frequency band 202 of 900 kHz to 2.2 MHz and receives an analog signal in a frequency band 302 of 4.3 MHz to 6.1 MHz.
- the analog transmission / reception unit 102b transmits an analog signal in the frequency band 304 of 6.1 ⁇ to 7.9 MHz and receives an analog signal in the frequency band 204 of 2.2 to 7.9 MHz. That is, the frequency bands used by the analog transmitting / receiving units 102a and 102b may be made different by narrowing the frequency bands used by the analog transmitting / receiving units 102a and 102b to reduce the communication speed. .
- the frequency bands of the transmission by the analog transmission / reception unit 102a, the reception by the analog transmission / reception unit 120a, the transmission by the analog transmission / reception unit 102b, and the reception by the analog transmission / reception unit are different. Accordingly, signal interference can be prevented in transmission and reception of the analog transmission / reception units 120a and 120b, so that high-quality data communication can be provided.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002313316A AU2002313316A1 (en) | 2002-07-01 | 2002-07-01 | xDSL RELAY APPARATUS AND COMMUNICATION SYSTEM |
PCT/JP2002/006626 WO2004004299A1 (ja) | 2002-07-01 | 2002-07-01 | xDSL中継機器及び通信システム |
JP2004517227A JPWO2004004299A1 (ja) | 2002-07-01 | 2002-07-01 | xDSL中継機器及び通信システム |
US10/064,934 US20040001587A1 (en) | 2002-07-01 | 2002-08-30 | xDSL interconnecting device and communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/006626 WO2004004299A1 (ja) | 2002-07-01 | 2002-07-01 | xDSL中継機器及び通信システム |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004004299A1 true WO2004004299A1 (ja) | 2004-01-08 |
Family
ID=29808178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/006626 WO2004004299A1 (ja) | 2002-07-01 | 2002-07-01 | xDSL中継機器及び通信システム |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040001587A1 (ja) |
JP (1) | JPWO2004004299A1 (ja) |
AU (1) | AU2002313316A1 (ja) |
WO (1) | WO2004004299A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10107701A (ja) * | 1996-05-20 | 1998-04-24 | At & T Corp | 低減された進入ノイズを持つ共有ハイブリッド同軸ファイバ網 |
JPH10208958A (ja) * | 1997-01-16 | 1998-08-07 | Nitsuko Corp | 箱型ノイズフィルタ |
JP2001345870A (ja) * | 2000-06-05 | 2001-12-14 | Kenkyu Shien Center:Kk | 回線選択中継装置 |
WO2002032005A1 (en) * | 2000-10-13 | 2002-04-18 | Nokia Corporation | Method of implementing a repeater, and a transceiver unit |
Family Cites Families (6)
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US5790548A (en) * | 1996-04-18 | 1998-08-04 | Bell Atlantic Network Services, Inc. | Universal access multimedia data network |
US6035000A (en) * | 1996-04-19 | 2000-03-07 | Amati Communications Corporation | Mitigating radio frequency interference in multi-carrier transmission systems |
US6067316A (en) * | 1997-11-19 | 2000-05-23 | Globespan, Inc. | Circuit for combined xDSL and other services |
US6262972B1 (en) * | 1998-12-31 | 2001-07-17 | Northern Telecom Limited | Digital multitone communication trunk |
US6741604B1 (en) * | 1999-11-12 | 2004-05-25 | Tioga Technologies, Inc. | ADSL transmission in the presence of low-frequency network services |
US20020101914A1 (en) * | 2001-01-29 | 2002-08-01 | Sabit Say | Extended reach VDSL |
-
2002
- 2002-07-01 JP JP2004517227A patent/JPWO2004004299A1/ja active Pending
- 2002-07-01 AU AU2002313316A patent/AU2002313316A1/en not_active Abandoned
- 2002-07-01 WO PCT/JP2002/006626 patent/WO2004004299A1/ja active Application Filing
- 2002-08-30 US US10/064,934 patent/US20040001587A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10107701A (ja) * | 1996-05-20 | 1998-04-24 | At & T Corp | 低減された進入ノイズを持つ共有ハイブリッド同軸ファイバ網 |
JPH10208958A (ja) * | 1997-01-16 | 1998-08-07 | Nitsuko Corp | 箱型ノイズフィルタ |
JP2001345870A (ja) * | 2000-06-05 | 2001-12-14 | Kenkyu Shien Center:Kk | 回線選択中継装置 |
WO2002032005A1 (en) * | 2000-10-13 | 2002-04-18 | Nokia Corporation | Method of implementing a repeater, and a transceiver unit |
Non-Patent Citations (1)
Title |
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ISAO YONEZAWA: "Metal cable o riyo shita sigital denso shuho no kakuritsu - HDSL denso sochiyo chukeiki no shisaku", R&D NEWS KANSAI, 1000 SEPTEMBER ISSUE (WHOLE NO. 379), 10 May 1999 (1999-05-10), pages 25 - 28, XP002957117 * |
Also Published As
Publication number | Publication date |
---|---|
US20040001587A1 (en) | 2004-01-01 |
AU2002313316A1 (en) | 2004-01-19 |
JPWO2004004299A1 (ja) | 2005-11-04 |
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