JP2007221531A - Premise distribution device and low-pass filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a premise distribution device that has no necessity for individually coping with a request of each subscriber in wiring construction of an optical cable line, and does not require additional construction even when a change such as connection of the optical cable line to a terminal of each subscriber in a user premise or abolishment of the optical cable line occurs, and to provide a low-pass filter used for the device. <P>SOLUTION: A relay device 12 in a telephone station 11 is connected to a telephone line 13 and an optical cable 14. The premise distribution device 2 in a collective dwelling 10 is constituted of a low-pass filter 1 having compound signal terminals 43, 44, 45 for passing through signals not higher than a predetermined frequency; and a modem 28 connected to an optical terminating device 19, having input/output terminals 33, 34, 35, and having a high-pass filter for passing through signals not lower than a predetermined frequency. The line is distributed to each terminal 15, 16, and 17 in each home by the premise distribution device 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is designed to communicate telephone voice and xDSL (x Digital Subscriber Line) digital data with a plurality of terminals installed in a user's house using a copper wire cable and an optical cable. The present invention relates to an in-home distribution apparatus installed in the premises and a low-pass filter used therein.

  In recent years, the spread of Internet communication networks has been remarkable, and the amount of digital data that can be transmitted and received and the transmission speed of digital data have been increased by xDSL. Among xDSL, ADSL (Asymmetric Digital Subscriber Line) having a transmission rate of 25 kHz to 3.75 MHz and VDSL (Very high-bit-rate Digital Subscriber Line) having a transmission rate of 640 kHz to 30 MHz are generally used. The spread is remarkable.

  In this Internet communication system using xDSL, as shown in Patent Document 1, for example, the transmission speed is limited only by a conventional telephone copper cable (telephone line), so an optical cable is used in addition to the telephone line. The number of laying, connecting and using is increasing rapidly. For this reason, in-house distribution devices are installed in user homes having a plurality of subscriber terminals such as apartment houses such as condominiums and apartments, and tenant buildings, and lines are distributed to each terminal.

  FIG. 3 is a block diagram showing an example of a communication system that distributes a line using a conventional in-house distribution device when such a telephone line and an optical cable are used together.

  As shown in FIG. 3, a telephone line 13 of the telephone network and an optical cable 14 of the Internet line are connected to the relay device 12 of the telephone station 11, and a telephone voice signal and an xDSL signal are transmitted through the telephone line 13, and an xDSL signal is transmitted through the optical cable 14. Sent and received. In the housing complex 10 which is a user's home, a VDSL device 18 which is a kind of modem device is installed as a home distribution device in order to distribute lines to the terminals 15, 16 and 17 of each home. FIG. 3 shows a case where the terminal 15 uses only a conventional telephone line and the terminals 16 and 17 use optical cables depending on the choice of each household.

  In FIG. 3, a voice signal and an ADSL signal are transmitted from the relay device 12 through the telephone line 13, and this is branched in the user's house and one is input to the POTS (Plan Old Telephone Service) terminal 21 of the VDSL device 18. The data is directly input to the terminal 15 through the wiring 26. On the other hand, data such as a VDSL signal is transmitted through the optical cable 14, converted into an electrical signal by the optical termination device 19, and input to the data input / output terminal 22 of the VDSL device 18. These are demodulated and separated in the VDSL device 18, synthesized with the audio signal input from the POTS terminal 21, and transmitted from the terminal input / output terminals 24 and 25 through the lines wired to the home terminals 16 and 17, respectively. Similarly, the return signal from the terminal 15 to the relay device 12 is also transmitted through the telephone line 13, and the return signal from the terminals 16 and 17 is separated into a voice signal and a data signal in the VDSL device 18, and the voice signal is POTS. The data signal is transmitted from the terminal 21 via a telephone line, modulated and multiplexed, sent from the data input / output terminal 22 to the optical terminator 19, converted into an optical signal, and transmitted.

  FIG. 4 is a block diagram showing an example of the VDSL apparatus 18 described above. The audio signal and xDSL signal input from the POTS terminal 21 are branched and pass through a low-pass filter (LPF) that passes only the audio signal, and are output to the terminal input / output terminals 23, 24, and 25. On the other hand, the xDSL signal input from the data input / output terminal 22 is separated and demodulated by the modem 26 and passes through a high-pass filter (HPF) that passes only the ADSL or VDSL xDSL signal for each terminal signal. And output to the terminal input / output terminals 23, 24, and 25. On the contrary, after the signal transmitted from each terminal is input to the VDSL device 18, it is first separated into an audio signal and an xDSL signal by the LPF and HPF and processed.

JP 2004-88727 A

  However, in the above-described conventional home distribution apparatus, when setting the line of each terminal, the optical cable must be connected in response to the request of each subscriber in the user's home. Therefore, as shown in FIG. Depending on the wiring will be different. Therefore, it is impossible to perform wiring work at an initial stage where the subscriber's request is unknown. Furthermore, when a request for connecting a subscriber terminal that is not connected to the optical cable later to the optical cable is generated, wiring switching work is required. For example, in FIG. 3, when connecting the terminal 15 to an optical cable line, it is necessary to cut the wiring 26 and connect the terminal input / output terminal 23 of the VDSL apparatus 18 and the terminal 15.

  The necessity of individual handling of such wiring work and the additional work increase the introduction cost of optical cable lines for each subscriber, which is one of the factors that hinder the spread of services using optical cables.

  Therefore, the problem of the present invention is that there is no need for individual handling in the optical cable line wiring work, and no additional work is required even if the connection of the optical cable line to the terminal of each subscriber in the user's home, changes such as disposal occur. An object is to provide a home distribution device and a low-pass filter used in the device.

  In order to solve the above problems, the in-house distribution device of the present invention transmits digital signals and telephone copper wire cables that transmit voice signals and digital data installed between a communication base station or communication relay station and a user's home. In an in-home distribution device installed at the user's home for communicating voice and digital data between the communication base station or communication relay station and a plurality of terminals connected to the user's home using an optical cable A low-pass filter having one connection terminal connected to the telephone copper cable and a plurality of terminals connected to the plurality of terminals and passing a signal of a specific frequency or less, and an optical termination device for the optical cable And a plurality of terminals branched and connected from a line connecting between the low-pass filter and the plurality of terminals. Comprising a modem having a high-pass filter which passes a constant frequency or more signals.

  The low-pass filter is a home distribution device that passes an ADSL signal having a carrier frequency of 1.1 MHz and blocks a signal having a higher frequency.

  The modulation / demodulation device may have an open terminal, and the low-pass filter may have a termination connected to the open terminal of the modulation / demodulation device.

  Moreover, the low-pass filter used for the residential distribution device according to the present invention has a termination portion and a connection terminal thereof.

  With the above configuration, the in-house distribution device of the present invention does not need to be individually handled in the construction work of the optical cable line, and is added even if a change such as connection or disposal of the optical cable line to the terminal of each subscriber in the user's house occurs. A home distribution device that does not require construction and a low-pass filter used in the device can be obtained.

  Furthermore, according to the present invention, it is possible to use a device used for a conventional home distribution device as it is, and to obtain a home distribution device with little increase in device cost.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram illustrating an example of a communication system that distributes a line using a home distribution apparatus according to the present invention. As in FIG. 3, the telephone line 13 of the telephone network and the optical cable 14 of the Internet line are connected to the repeater 12 of the telephone station 11, and the telephone voice signal and the xDSL signal are transmitted / received by the telephone line 13, and the xDSL signal is transmitted / received by the optical cable. The In the housing complex 10 which is a user's home, the home distribution device 2 according to the present invention is installed in order to distribute the line to the terminals 15, 16 and 17 of each home.

  The residential distribution device 2 (inside the broken line) has a POTS terminal 4 connected to the telephone line 13 and composite signal terminals 43, 44, 45 connected to the terminals 15, 16, 17 respectively, and passes signals below a specific frequency. The low pass filter 1 to be connected, the data input / output terminal 32 connected to the optical terminator 19 of the optical cable, and the terminal input / output terminal 33 connected by branching from the line connecting the low pass filter 1 and each terminal. , 34, and 35, and a modulation / demodulation device 28 having a high-pass filter that passes a signal having a specific frequency or higher.

  Here, in the residential distribution device 2 of the present embodiment, an example of the circuit configuration of the low-pass filter 1 used there is shown in FIG. This circuit comprises a filter circuit shown in FIG. 2 (a) and a termination circuit shown in FIG. 2 (b). The filter circuit is a standard circuit composed of a coil inductance (L) and a capacitor capacitance (C). It is a filter circuit. The termination circuit comprises a resistor Rxx that matches the impedance of the circuit to be terminated, which will be described later, and a DC cut capacitor.

  In the present embodiment, the constants of the filter circuit are set so that a 1.1 MHz ADSL signal is allowed to pass and a signal having a higher frequency exceeding that is cut off. As a result, a signal input from the telephone line 13 and passed through the low-pass filter 1 and communicated with the terminal is an audio signal and an ADSL signal of 1.1 MHz or less.

  On the other hand, the modem 28 has a built-in high-pass filter that receives an xDSL signal from an optical cable and blocks signals below the 1.1 MHz ADSL signal. As a result, an ADSL signal and a VDSL signal having a frequency higher than 1.1 MHz are communicated between each terminal and the relay station 11 via the modem 28 via the optical cable.

  In general, the purpose of introducing an optical cable by a subscriber is high-speed data communication. Usually, the advantage of this is communication such as an ADSL signal or VDSL signal that is faster than 1.1 MHz. Therefore, in the present invention, a low-pass filter 1 is installed to set the cut-off frequency as a frequency for separating communication over a telephone line and communication over an optical cable, and a terminal for performing communication over a telephone line using the low-pass filter 1 And in-house wiring for terminals that communicate using optical cables.

  In other words, according to the present invention, there is no need for individual handling in the optical cable line wiring work, and no additional work is required even if the connection of the optical cable line to the terminal of each subscriber in the user's home, a change, etc. occur.

  In the present invention, the conventional VDSL device 18 can be used as the modem device 28. In this case, in FIG. 4, the data input / output terminal 22 corresponds to 32, and the terminal input / output terminals 23, 24, and 25 become 33, 34, and 35, respectively. The POTS terminal 21 and the LPF are not used. The cutoff frequency of the HPF is set so as to cut off signals below the 1.1 MHz ADSL signal.

  In this way, there is a cost merit by mass production, and by using the conventional VDSL device 18 which has a track record in the market, a home distribution device with little increase in device cost can be obtained.

  However, when the VDSL device 18 is used in this way, the LPS and the opened POTS terminal 21 remain connected to the terminal input / output terminals 23, 24, and 25 as described above. Therefore, it is desirable to terminate the POTS terminal 21 in order to prevent a circuit failure. Therefore, in the low-pass filter 1 of this embodiment, as shown in FIG. 2B, a termination circuit is built in, and the above-mentioned obstacle can be eliminated by wiring connection between the termination terminal 46 and the POTS terminal 21 of the VDSL device 18. it can.

  In the above-described embodiment, the 1.1 MHz ADSL signal is used as the reference frequency for separating the telephone line and optical cable signals. However, depending on the situation of the user, the distance to the relay device, etc., a higher frequency or It is also possible to reference a lower frequency.

  Needless to say, the configuration of the low-pass filter and the modem used in the present invention is not limited to the above-described embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating one Embodiment of the residential distribution apparatus by this invention, and is a block block diagram which shows an example of the communication system which distributes a line | wire using the residential distribution apparatus by this invention. The figure which shows an example of the circuit structure of the low-pass filter used for the residential distribution apparatus by this invention. 2A shows a filter circuit, and FIG. 2B shows a termination circuit. The block block diagram which shows an example of the communication system which distributes a line using the conventional residential distribution apparatus when a telephone line and an optical cable are used together. The block block diagram which shows an example of the conventional VDSL apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Low-pass filter 2 Residential distribution device 3 Termination part 4, 21, 31 POTS terminal 10 Apartment house 11 Telephone station 12 Relay device 13 Telephone line 14 Optical cable 15, 16, 17 Terminal 18 VDSL device 28 Modulator / Demodulator 19 Optical terminator 22 , 32 Data input / output terminals 23, 24, 25, 33, 34, 35 Terminal input / output terminal 26 Modem 43, 44, 45 Composite signal terminal 46 Termination terminal

Claims (4)

  The communication base station or communication relay station using a telephone copper wire cable for transmitting digital signals and an audio signal laid between the communication base station or communication relay station and the user's home, and an optical cable for transmitting digital data And a plurality of terminals connected to the user's home in a home distribution device installed in the user's home to communicate voice and digital data, one connection terminal connected to the telephone copper wire cable And a plurality of terminals connected to the plurality of terminals, a low-pass filter that passes signals of a specific frequency or less, one connection terminal that is connected to the optical termination device of the optical cable, the low-pass filter, A variable having a plurality of terminals connected to a line connecting between a plurality of terminals and having a high-pass filter that passes a signal of the specific frequency or higher. Home dispensing apparatus comprising a tone device.   2. The residential distribution device according to claim 1, wherein the low-pass filter passes an ADSL signal having a carrier frequency of 1.1 MHz and blocks a signal having a high frequency exceeding the ADSL signal.   The residential distribution device according to claim 1 or 2, wherein the modulation / demodulation device has an open terminal, and the low-pass filter has a terminal portion that can be connected to the open terminal of the modulation / demodulation device.   A low-pass filter having a termination portion and a connection terminal for the termination portion, which is used in the residential distribution device according to claim 3.

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