KR19990078841A - Data Communication Network for Transmitting and Receiving LAN Data through Voice Telephone Lines and Data Transceiver Suitable for the Same - Google Patents

Abstract

A plurality of data terminals may be connected to one telephone line, and each of the plurality of data terminals provides a data communication network capable of combining and transmitting a telephone signal and a LAN data signal through a telephone line. The data communication network includes a hub, a center module and a plurality of premises systems. The hub switches a plurality of premises systems and is connected to an external data communication network. The center module is connected to each of a plurality of premises systems via a four-wire telephone line, and is connected to a hub and an external telephone communication network through predetermined lines, respectively. The center module combines the downlink data signal received through the hub and the downlink signal received from the external data communication network and transmits it to any one of a plurality of indoor systems through a telephone line, and the combined uplink signal received from each of the plurality of indoor systems. The uplink data signal and the uplink signal are extracted from the uplink data signal to the hub, and the uplink signal is transmitted to the external telephone communication network. In an indoor system, the subscriber outlet is connected to a telephone line and is installed at a fixed location and has a subscriber module connection port. The subscriber module has a plug for insertion into the subscriber module connection port and connects the telephone and / or data terminal to the telephone line.

Description

Data Communication Network for Transmitting and Receiving LAN Data through Voice Telephone Lines and Data Transceiver Suitable for the Same}

The present invention relates to a data communication network, and more particularly, to a data communication network capable of simultaneously transmitting and receiving telephone signals and LAN data using a telephone line installed in each home or office, and a data transmission / reception apparatus for use in such a communication network. will be.

The Internet, which is used as a means of collecting and transmitting various information, is becoming an indispensable service in information and communication today. The most commonly used method for accessing the Internet backbone network is to connect through a general telephone network using a dial-up modem. According to this method, a digital signal to be transmitted is converted into an analog signal and then transmitted and received through a copper wire, which has a disadvantage in that it is very difficult to transmit data having a speed of 56 Kbps or more as an analog signal. Therefore, there is a problem in that when connecting to the Internet using a telephone modem, a video or a large amount of text data cannot be transmitted at a sufficiently high speed. In order to increase the transmission speed, the Internet access method through the ISDN is widely used, but the commercialized ISDN is also a circuit-switched network through copper wire, which does not significantly improve the transmission speed compared to a general telephone network.

Various methods have been proposed to utilize optical communication network to increase the transmission speed. The most ideal as an optical communication network is to establish an optical fiber-to-the-home (FTTH) subscriber network that can transmit data through optical fibers by laying optical fibers to each home individually. However, the FTTH method has a problem in economics in that an optical network unit (ONU) must be separately installed in each home. Moreover, it is very difficult to receive communication service in each home based on the FTTH method because of the enormous cost and time required to install fiber to each home. Accordingly, a fiber-to-the-curb (FTTC) scheme in which a plurality of homes jointly use optical fibers has been proposed. In the FTTC system, the ONU is installed in the curb on the street, and the optical fiber is laid up to the ONU, and the copper is connected from the ONU to each home. According to the FTTC method, since a plurality of households share the ONU and the optical fiber, the economic burden of each household is reduced, and it is not necessary to install the optical fiber in each household. However, even under the FTTC method, the problem of having to lay the optical fiber and installing the ONU until the curve remains.

Accordingly, various methods have been sought to utilize existing cable television networks or copper wire telephone networks instead of newly laying optical fibers. In the Internet subscriber network through the cable TV network, the cable TV subscriber purchases a cable modem, installs it in his computer, and connects to the Internet through it. However, cable TV is not yet widespread in our country, so it is expected that it will take considerable time for cable TV networks to be available in most homes. Moreover, cable modems are very expensive compared to telephone modems, which is a burden for general home use. Hybrid fiber coax (HFC) networks, which use optical cables to transmit data to the ONU and coaxial cables from the subscriber to the ONU, have the same problem. On the other hand, in order to take advantage of the copper wire of the general telephone network, according to the DSL (Digital Subscriber Line) method of directly digitally modulating the data without converting the data into an analog signal, the DSL equipment must be installed at the telephone company in the service area. Since a telephone station needs to be connected to the Internet at a high speed, it is very difficult to implement this for an Internet service provider other than a general telephone operator.

In this regard, the prior patent application filed on May 10, 1999 by the inventor (application number: 10-1999-0016665, the name of the invention: LAN data transmission apparatus over a telephone line) and the prior patent application filed as the same ( Application No. 10-1999-0016666, Name of the invention: LAN data transmission apparatus over a telephone line) combines a telephone signal and a LAN data signal and transmits the telephone signal and a LAN data signal from the received signal, respectively. It describes a data transmission device that separates using a low pass filter and a high pass filter. According to such a data transmission device, since a data signal can be transmitted along with a telephone signal to a subscriber in an apartment or a business building by using a telephone line installed for voice communication, an internet subscriber network capable of high-speed data transmission is inexpensive. It is easy to build with investment cost.

However, when the Internet subscriber network is established using only the data transmission apparatus described in the above patent application, one telephone line is connected through one telephone line due to the constraint that termination is required for high-speed transmission of about 10 Mbps, for example. It may be possible to connect only the fixed point of to the center module. In this case, only one computer can be connected to a telephone line in a fixed position.

In general, however, a number of four-pronged outlets for telephone connection are usually installed in an apartment or a business building, and a person wishing to communicate data through a computer can connect his computer to any of these four-pronged outlets. You may want to communicate. Furthermore, families living in apartments or people working together in office buildings may want to simultaneously connect each computer at the same location to the same telephone line for data communication.

The present invention has been made in order to satisfy such a need, a plurality of data terminals can be connected to one telephone line, each of the plurality of data terminals can transmit and receive a combination of a telephone signal and a LAN data signal through a telephone line The technical problem is to provide a communication network.

Meanwhile, another object of the present invention is to provide a data transmission / reception apparatus capable of connecting a plurality of data terminals to respective telephone lines in a data communication network capable of transmitting and receiving a telephone signal and LAN data through a telephone line. Shall be.

1 is a diagram showing an embodiment of a data communication network according to the present invention;

2 is a circuit diagram of the center module shown in FIG.

3 is a circuit diagram of a subscriber outlet shown in FIG.

4 is a circuit diagram of the subscriber module shown in FIG.

5 is a perspective view of a preferred embodiment of a subscriber module.

6 is a circuit diagram of the parallel expansion module shown in FIG.

7 is a circuit diagram of the series expansion module shown in FIG.

8 is a view showing an example of a home network according to the present invention.

9 is a view showing another example of the home network according to the present invention.

10 is a view showing another example of a home network according to the present invention.

** Explanation of symbols for main parts of the drawing **

10: switching hub 20: center module

30: premises system 40: subscriber outlet

50: subscriber module 60: parallel expansion module

70: serial expansion module 90: data terminal

92: telephone 99: regular telephone plug

The data communication network for achieving the technical problem includes a hub, a center module and a plurality of premises systems, a plurality of premises systems can be connected through each telephone line to transmit and receive data signals with voice signals, a plurality of premises Allows the system to be connected with external data networks and external telephone networks. The hub switches a plurality of premises systems and is connected to the external data communication network.

The center module is connected to each of the plurality of premises systems via a four-wire telephone line, and is connected to the hub and the external telephone communication network through predetermined lines, respectively. The center module combines the downlink data signal received through the hub and the downlink signal received from the external data communication network and transmits the combined downlink signal to any one of the plurality of indoor systems through the telephone line. Extracting an uplink data signal and an uplink signal from the combined uplink signal received from each of the indoor systems, transmitting the uplink data signal to the hub and transmitting the uplink signal to the external telephone communication network.

The indoor system includes at least one subscriber outlet and a subscriber module. The subscriber outlet is connected to the telephone line and is installed at a fixed position, and has a subscriber module connection port in the form of a socket. The subscriber outlet also includes termination and switching circuitry to block data signal flow back and out of the subscriber outlet when the data terminal is connected through a subscriber module.

The subscriber module has a plug for inserting into the subscriber module connection port and connects a telephone and / or data terminal to the telephone line. In a preferred embodiment, the subscriber module has a substantially rectangular parallelepiped shape and protrudes in front of the plug. The subscriber module selectively passes only the downlink data signal among the combined downlink signals received through a data terminal connection port for connecting a data terminal, a phone connection port for connecting a telephone, and a subscriber outlet and a plug. And a high pass filter for supplying the terminal connection port, and a low pass filter for selectively passing only the downlink signal from the combined downlink signal to the phone connection port. The subscriber module combines the uplink data signal from the data terminal and the uplink signal from the telephone to transmit the combined uplink signal to the center module through the subscriber outlet and the telephone line.

On the other hand, the data communication network is preferably implemented by including at least one of a parallel expansion module and a serial expansion module. The parallel expansion module is installed before the subscriber outlet and increases the number of data terminals that can be used simultaneously through one telephone line by increasing the number of data terminal connection ports in a parallel telephone line structure. In addition, the serial expansion module is also installed before the subscriber outlet, and increases the number of data terminals that can be used simultaneously through one telephone line by increasing the number of data terminal connection ports in a serially connected telephone line structure.

In such a data communication network, a data signal and a telephone signal are combined and transmitted to each other and then separately received through a separate filter at a receiving side. Accordingly, it is possible to simultaneously transmit and receive data signals and telephone signals through a four-wire telephone line installed in the subscriber's home.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 shows an embodiment of a data communication network according to the present invention. The data communication network includes a switching hub 10, a center module 20, and an indoor system 30, and is suitable for implementing an internet subscriber network. The data communication network of FIG. 1 may be constructed in units of buildings or aisles in a multi-unit house such as an apartment, or in office units or floor units in a business building. When implemented in the apartment, the switching hub 10 and the center module 20 is located in the line distribution room (MDF) of each apartment agreement line distribution box or management office. On the other hand, when built in a business building, the switching hub 10 and the center module 20 is located in the circuit distribution room (MDF) or communication room of the building or circuit distribution box of each floor.

In a preferred embodiment of the present invention, the switching hub 10 and the center module 20 are installed and managed by an internet service network provider. The switching hub 10 is connected to the Internet to the host of the Internet service network operator through a dedicated line, and transmits and receives Internet traffic according to the TCP / IP protocol or the Ethernet protocol. The switching hub 10 delivers the traffic received from the Internet to the corresponding indoor system 30 through the center module 20. In addition, the switching hub 10 receives data traffic transmitted from each premises system 30 through the center module 20, regenerates the signal level, and transmits the signal level to the Internet.

The center module 20 is connected to the switching hub 10 through an RJ-45 connector provided on the front surface, and is connected to the plurality of indoor systems 30 through a plurality of four-wire telephone lines L10. In addition, the center module 20 is connected to the public communication network through a 37-pin connector provided on the back. Accordingly, the center module 20 separates the data signal and the telephone signal of the signals transmitted through the four-wire telephone line L10 from each of the plurality of indoor systems 30, so that the dual data signal is switched hub 10 And transmit the telephone signal to the exchange of public network. In addition, the center module 20 combines the data signal received through the switching hub 10 and the telephone signal received from the telephone communication network and transmits the data signal to the corresponding indoor system through the four-wire telephone line L10. However, if the data communication network of the present invention is built in a business building with a private branch exchange 900, the center module 20 may be connected to the public communication network through a private branch exchange 900. On the other hand, in the preferred embodiment, the first line pair of the four-wire telephone line is used to transmit a telephone signal and a signal of either the transmission signal or the reception signal of data, and the other telephone line, that is, the second line pair, The other of the received signals is used to transmit.

The indoor system 30 is installed on each floor of each subscriber's home or business building. In the following, in order to simplify the explanation, a description will be given focusing on the case where the indoor system 30 of the present invention is installed in a home. The premises system 30 is a subscriber outlet (40a-40e: hereinafter, denoted as 40 except where necessary) and a subscriber module (50a, 50c, 50e: hereinafter, 50 except where required). Notation). The subscriber receptacle 40 is installed in a wall or the like of a home in a manner similar to a conventional telephone receptacle, and a user can use a subscriber module 50 to connect a subscriber equipment such as a data terminal 90 and / or a telephone 92 to a four-wire telephone line. Allows access to The subscriber module 50, combined with the subscriber outlet 40, combines the data signal from the data terminal 90 and the telephone signal from the telephone 92 and loads it on a four-wire telephone line. The data signal and the telephone signal in the separate and provided to the data terminal 90 and the phone 92, respectively.

On the other hand, in the indoor system 30, a plurality of subscriber outlets 40a-40e may be connected in series as shown in the drawing. However, as will be described later, the telephones are additionally connected to the outlets 40b, 40d, and 40e which are arranged after the data terminals 90 are connected (for example, 40a or 40c) among the subscriber outlets 40a-40e. Although it may be used, it is preferable that the data terminal 90 not be additionally connected in consideration of a data collision. Accordingly, the indoor system 30 shown in FIG. 1 includes a parallel expansion module 60 and a serial expansion module 70 in order to connect and use a plurality of data terminals 90 at the same time. The parallel expansion module 60 extends the data terminal connection port in the home network connected in parallel, and the serial expansion module 70 extends the data terminal connection port in the home network connected in series.

The data communication network according to the present invention can be constructed using telephone lines already installed in existing houses and office buildings as well as newly constructed buildings. As described above, in the case of constructing a communication network in an existing house or business building, if the telephone line is wired in parallel, it is preferable to use the parallel expansion module 60 in expanding the data terminal connection port, while the telephone line is in series. In the case of wiring, it is preferable to use the serial expansion module 70 in expanding the data terminal connection port. Of course, in one indoor system 30, several parallel expansion modules 60 and / or serial expansion modules 70 may be used in combination depending on the telephone wiring type.

2 is a circuit diagram of the center module 20 shown in FIG. The center module 20 includes a switching hub connection port 22, a telephone line connection port 24 for connecting a telephone line, a high pass filter 26, and a low pass filter 28. The high pass filter 26 has a cutoff frequency of 100 kilohertz (KHz) so that only the data signal can pass, and the low pass filter 28 has a cutoff frequency of 10 KHz so that only the telephone signal can pass. The TX + and TX- terminals of the switching hub connection port 22 are connected to the first line pair L11 through the high pass filter 26, and the RX + and RX- terminals are directly connected to the second line pair L12. . The ring and tip terminals of the telephone line connection port 24 are connected to the first line pair L11 through the low pass filter 28. Accordingly, the data signal received from the switching hub 10 is transmitted to the premises system 30 through the second line pair L12. In addition, the telephone signal received from the telephone line is transmitted to the premises system 30 through the first line pair L11. Meanwhile, among the mixed signals received from the indoor system 30 through the first line pair L11, the data signal selected by the high pass filter 26 is the TX + and TX− terminals of the switching hub connection port 22. Is transmitted to the switching hub 10, and the telephone signal selected by the low pass filter 28 is transmitted to the telephone station through the telephone line connection port 24.

3 is a circuit diagram of the subscriber outlet 40 shown in FIG. The subscriber outlet 40 includes a subscriber module connection port 42 and an automatic termination and switching circuit 44. The automatic termination and switching circuit 44 includes a switching unit 46 and a low pass filter 48. The subscriber module connection port 42 is provided with terminals 42a-42d mounted inside four holes, so that the subscriber module 50 according to the present invention or a conventional four-hole plug for a telephone can be inserted. In the subscriber module 50 according to the present invention, as shown in FIG. 1, a telephone-only module 50e used for connecting only a telephone and a general purpose module 50a used for connecting a telephone only with a data terminal or with a data terminal. , 50c). Looking at the operation of the subscriber outlet 40 when each type of module is inserted as follows.

When the telephone outlet module 50e or the conventional four-hole plug for the conventional telephone is inserted into the subscriber outlet 40, the four switches of the switching unit 46 are switched to the position shown. In this case, the front first line pair L41 and the second line pair L42 are connected to the four terminals 42a to 42d of the subscriber module connection port 42 as well as the rear first line pair L51. And the second line pair L52. As a result, a telephone channel is formed through the illustrated subscriber outlet 40, and a telephone or a data terminal can be installed and used through the subscriber outlet at the rear.

On the other hand, when the universal modules 50a and 50c are inserted into the subscriber outlet 40, the four switches of the switching unit 46 are switched to the opposite positions as shown. Also at this time, since the first line pair L41 and the second line pair L42 are connected to the four terminals 42a to 42d of the subscriber module connection port 42, the first line pair L41 and the second line pair L42 are connected to the corresponding subscriber outlet 40. The data terminal is capable of data communication. However, the received data signal received from the front first line pair L41 is prevented from being transmitted to the rear first line pair L51 due to the action of the low pass filter 48, and the rear second line. Transmission data signals received from the pair L52 are also not transmitted to the second front line pair L42. However, since the front first line pair L41 and the rear first line pair L51 are connected to each other through the low pass filter 48, a telephone channel for the telephone set in the rear may be formed. As such, when the general-purpose subscriber module is inserted into the subscriber outlet 40, the subscriber outlet 40 at the rear thereof can only make a phone call and cannot perform data communication.

Thus, in order to enable the switching unit 46 to switch depending on whether the universal modules 50a and 50c are inserted or the telephone-only module 50e or the conventional four-hole plug for the telephone, the preferred embodiment of the present invention is preferred. In the embodiment, a separate switch is provided at the subscriber outlet 40. An example of such a switch is a toggle switch that can be manually operated by a user according to the type of subscriber module to be inserted. However, in another example, a pressure sensor switch may be provided at the subscriber outlet 40, and a protrusion may be formed only in front of the general purpose modules 50a and 50c to operate the pressure sensor switch. On the other hand, in operating the switching unit 46 by such a switch, it is possible to generate a switching control signal (CONT of FIG. 1) electrically so that the switching unit 46 is controlled by the switching control signal CONT. However, in other embodiments it may be possible for the switching unit 46 to switch mechanically.

In the subscriber receptacle 40 of FIG. 3, the inductors in the low pass filter 48 perform between the front and rear first and second line pairs L41 and L51 in addition to performing a filtering function to selectively pass only the telephone signal. The impedance matching between the first or the first line pair L41 and the subscriber module connection port 42 is also performed. This enables long-distance transmission of data and alleviates communication constraints caused by the length of telephone lines in the home.

4 is a circuit diagram of the subscriber module 50 shown in FIG. Subscriber module 50 includes a plug 52, a data terminal connection port 54, a high pass filter 56, a telephone connection port 58, and a low pass filter 59. 5 shows the form of a subscriber module 50 in the preferred embodiment. As shown in FIG. 5, the subscriber module 50 is in the form of a box, and is formed by protruding a plug of four connectors for inserting into the subscriber outlet 50 at the front. In addition, the side is provided with a data terminal connection port 54, the data terminal connection port 54 is implemented using an RJ-45 connector. In addition, the bottom is provided with a telephone connection port 58, the telephone connection port 58 is implemented using an RJ-11 connector.

Referring again to FIG. 4, the high pass filter 56 has a cutoff frequency of 100 kHz (KHz) to pass only the data signal, and the low pass filter 59 of 10 KHz to pass only the phone signal. Has a cutoff frequency. The RX + and RX- terminals of the data terminal connection port 54 are connected to the first and second terminals 52a and 52b of the plug 52 through the high pass filter 26, respectively, and the TX + and TX- terminals are plugs. It is directly connected to the third and fourth terminals 52c and 52d of (52). The RING and TIP terminals of the telephone connection port 58 are connected to the first and second terminals 52a and 52b of the plug 52 through the low pass filter 59.

The upstream data signal received from the data terminal through the RX + and RX− terminals of the data terminal connection port 54 is applied to the first and second terminals 52a and 52b of the plug 52. In addition, the uplink signal received from the telephone via the telephone connection port 58 is also applied to the first and second terminals 52a and 52b of the plug 52. Accordingly, the uplink data signal and the uplink signal are mixed at the first and second terminals 52a and 52b of the plug 52 and transmitted to the center module. In addition, the downlink signal received through the first and second terminals 52a and 52b of the plug 52 may be selected by the low pass filter 59 and transmitted to the telephone through the telephone connection port 58. have. At this time, the high pass filter 56 prevents the telephone signal component of the signals of the first line pair from being mixed into the data terminal. Meanwhile, the received signals received from the LAN through the third and fourth terminals 52c and 52d of the plug 52 are transmitted to the data terminal through the TX + and TX− terminals of the data terminal connection port 54.

FIG. 6 is a circuit diagram of the parallel expansion module 60 shown in FIG. 1. The parallel expansion module 60 includes a two-terminal hub 62, high pass filters 64, 66 and 67, and a low pass filter 68, thereby extending the data terminal connection port in parallel. give. On the other hand, the parallel expansion module 60 may further include a telephone connection port 69 for connecting a telephone. The hub 62 has an upward port connected to the telephone line of the center module side and first and second downward ports respectively connected to the telephone lines of the first and second channels. The TX + and TX- terminals of the upstream port of the hub 62 are connected to the first line pair L11 of the telephone line of the center module side through the high pass filter 64, and the RX + and RX- terminals are connected to the second line pair L12. ) Directly. The RX + and RX- terminals of the first down port are connected to the first line pair L21 of the first channel side telephone line through the high pass filter 66, and the TX + and TX- terminals are connected to the second line pair L22. It is directly connected. The RX + and RX- terminals of the second down port are connected to the first line pair L31 of the second channel side telephone line through the high pass filter 67, and the TX + and TX- terminals are connected to the second line pair L32. It is directly connected. The low pass filter 68 is connected between the center module side first line pair L11 and the first and second channel side first line pairs L21 and L31.

In the parallel expansion module 60, the telephone signal is selected by the low pass filter 68 among the mixed signals existing on the first line pair L11 at the center module side, and the first and second channel side first signals are selected. It is transmitted in combination with the data signal on the line pairs L21 and L31. Further, among the mixed signals existing on the first and second channel side first line pairs L21 and L31, the telephone signals are selected and mixed by the low pass filter 68 and then the center module side first line. In combination with the data signal in the pair (L11) is transmitted to the center module side. Meanwhile, the downlink data signal received through the center module side second line pair L12 is demultiplexed by the hub 62 and transmitted to the first and second channel side second line pairs L22 and L32. . In addition, among the upstream mixed signals received through the first and second channel side first line pairs L21 and L31, the data signals are selected by the high pass filters 66 and 67, respectively, and the hub 62 is selected. It is multiplexed by and transmitted to the center module side first line pair L11.

7 is a circuit diagram of the series expansion module 70 shown in FIG. The serial expansion module 70 includes a two-terminal hub 72, high pass filters 74 and 76, a low pass filter 77, a data terminal connection port 78, and a telephone connection port 79. It includes, and extends the data terminal connection port in series. The hub 72 has an upward port and third and fourth downward ports connected to the telephone line of the center module side. The TX + and TX- terminals of the up port of the hub 72 are connected to the first line pair L21 of the telephone line of the center module side through the high pass filter 74, and the RX + and RX- terminals are connected to the second line pair L22. ) Directly. The RX + and RX- terminals of the third down port are connected to the rear first line pair L41 through the high pass filter 76, and the TX + and TX- terminals are directly connected to the second line pair L42. The fourth downward port is connected to the data terminal connection port 78. The low pass filter 77 is connected between the center module side first line pair L21 and the rear side first line pair L41.

In such a serial expansion module 70, the telephone signal among the mixed signals existing on the first line pair L21 on the center module side is selected by the low pass filter 77 and supplied to the telephone connection port 79. In addition, the data signal is coupled to the data signal on the rear side first line pair L421 and supplied to the rear side. In addition, the telephone signal is selected by the low pass filter 77 and mixed with the signal from the telephone connection port 79 among the upward mixed signals received through the rear first line pair L421, and then the center module side. The first line pair L21 is coupled to the data signal and transmitted to the center module side. On the other hand, the downlink data signal received through the center module side second line pair L22 is demultiplexed by the hub 72 to be supplied to the data terminal connection port 78 or to the rear side second line pair L42. Is sent. Further, data signals among the upstream mixed signals received through the rear side first line pair L41 are respectively selected by the high pass filters 76 and then from the data terminal connection port 78 by the hub 62. Are multiplexed with the uplink data signal of the first transmission line and transmitted to the first line pair L21 of the center module side.

In the data communication network of the present invention, the telephone signal can be transmitted without affecting each other in the data signal and the frequency multiplexed state, respectively. In the case of a telephone signaling channel, traffic is only present when the telephone is off-hook or a call is received from outside. However, the data signal channel may always be active regardless of the setting of the communication channel over the public telecommunication network. That is, the data communication network according to the present invention bypasses the public telecommunication network switch and directly connects to the host of the Internet service network operator from the switching hub 10. Accordingly, the data communication network operates like a high speed leased line. In particular, in the above description, each data terminal connection port 54, 78 is connected to each data terminal, for example, a LAN card or an Ethernet adapter of a computer, and data is transmitted and received by the Ethernet protocol.

8 shows an example of a home network implemented according to the present invention. In the home network of Fig. 8, a plurality of subscriber outlets 40 are connected in series via telephone lines. One LAN user's personal computer is connected to one subscriber outlet 40, and a telephone is connected to a part of the other subscriber outlets 40. In connecting the telephone to the subscriber outlet 40, a general telephone plug 99 may be used or the subscriber module 50 may be used.

Telephone signals transmitted or received by each telephone are transmitted and received through the first line pair of telephone lines. Meanwhile, the uplink data signal transmitted from the LAN card of the personal computer, that is, the Ethernet adapter, is mixed with the telephone signal in the subscriber module 50 and transmitted to the center module through the telephone line. In addition, the downlink data signal received from the center module is supplied to the personal computer through the subscriber module (50). At this time, the automatic termination and switching circuit 44 in each subscriber outlet 50 matches the impedance of each line pair component to enable long-distance transmission of the signal, and cuts the high frequency to the telephone to cut the high frequency by the capacitor in the telephone. Prevents attenuation Accordingly, the personal computer can freely connect and use the subscriber module 50 connected to its own computer to the subscriber outlet 50 in the home.

9 shows another example of a home network implemented in accordance with the present invention. In the home network of Fig. 9, telephone lines are connected in series, and several LAN users can connect and use personal computers. When several computers are connected to the telephone line connected in series in this way, computers other than the computer at the rear end are connected via the serial expansion module 70. As described with reference to FIG. 7, the serial expansion module 70 multiplexes the LAN data signal received from the rear and the LAN signal from the data terminal connection port (78 of FIG. 7) and transmits the LAN signal to the center module side. The downlink LAN signal is transmitted from the computer connected to the data terminal connection port and the telephone line at the rear. On the other hand, in the serial expansion module 70, the telephone signal bypasses the hub 72 through the low pass filter 77.

10 shows another example of a home network implemented in accordance with the present invention. In the home network of FIG. 10, telephone lines are connected in parallel, and several LAN users can connect and use a personal computer. As described above, when multiple computers are connected to the telephone lines connected in parallel, the parallel expansion module 60 may be used to increase the number of subscriber devices for each branch in the tree-type telephone line wiring.

The above description illustrates a preferred embodiment of the present invention, and the present invention is not limited thereto and may be variously modified. For example, in the preferred embodiment, both the first line pair and the second line pair are used for data signal transmission, whereas the telephone signal is transmitted only through the first line pair. In another embodiment of the present invention, the telephone signal is It may be transmitted through a second line pair instead of one line pair. In this embodiment, the data signal is combined with and separated from the telephone signal through high pass filtering of the received signal rather than the transmit signal of the subscriber device. In addition, although the two-terminal hubs 62 and 72 are used in the parallel expansion module 60 and the serial expansion module 70 in the preferred embodiment, in other embodiments, the terminal expansion is generally performed by the N-terminal multi-terminal hub. It is also possible.

In addition, in another embodiment of the present invention, a telephone signal may be transmitted through both the first line pair and the second line pair. This embodiment can be easily implemented by adding only lowpass filters to the system according to the preferred embodiment described above. According to this embodiment, a first line pair is used to transmit either one of a transmission signal and a reception signal of data and a first telephone signal and the second line pair is combined with a second signal of the transmission signal and reception signal of the data. It can be used to transmit telephone signals, and one 4-wire telephone line can simultaneously form a data signal channel and a telephone line of two lines.

On the other hand, while the description of the preferred embodiment has described a data communication network centering on the case of being used for Internet access at home, as described above, the data communication network of the present invention can be used to make an Internet connection in an enterprise or other business building. It may be. Further, the data communication network of the present invention can be used not only for the Internet but also for other purposes, for example, for business LAN or home automation. In the present specification, including the claims to be described later, the term "home device" is used as a generic term for a subscriber system connected to the center module.

According to the data communication network of the present invention as described above, it is possible to easily build a 10Mbps Ethernet network at low cost in buildings, apartment complexes, malls, hotels, etc. by using the existing four-wire telephone line. In particular, such a data communication network is advantageous in that it operates in a full duplex manner.

In addition, depending on the wiring type of the telephone line in each house, the use of a serial expansion module or a parallel expansion module enables the expansion of additional LAN terminals for expansion of subscriber equipment, so that several people can simultaneously perform data communication, especially the use of the Internet. There is an effect.

Claims (9)

A plurality of indoor systems 30 may be connected through respective telephone lines to transmit and receive data signals with voice signals, and the plurality of indoor systems 30 may be connected to an external data communication network and an external telephone communication network. As A hub 10 connected to the external data communication network; And It is connected to each of the plurality of indoor systems 30 through a four-wire telephone line separately provided for each of the plurality of indoor systems 30, and is connected to the hub 10 and the external telephone communication network through predetermined lines, respectively. And a downlink signal combined by combining a downlink data signal received through the hub 10 and a downlink signal received from the external data communication network to one of the plurality of indoor systems 30 through the telephone line. And extracts an uplink data signal and an uplink signal from the combined uplink signal received from each of the plurality of indoor systems 30, transmits the uplink data signal to the hub 10, and transmits the uplink signal to the external device. A center module 20 for transmitting to a telephone communication network; Including; The indoor system 30 At least one subscriber outlet 40 connected to the telephone line and installed at a fixed position and having a subscriber module connection port 42 in the form of a socket; And A subscriber module 50 having a plug 52 for inserting into the subscriber module connection port 42 and connecting any one selected from the group of communication terminals consisting of a telephone, a data terminal and a combination thereof to the telephone line. ); Data communication network comprising a. The method of claim 1, wherein the subscriber outlet 40 is Termination and switching circuitry (44) for blocking data signal flow back and out of the subscriber outlet (40) when a data terminal is connected via the subscriber module (50); Data communication network further comprises. According to claim 1, wherein the subscriber module 50 is in the form of a substantially rectangular parallelepiped and the plug 52 is formed to protrude in front of the, A data terminal connection port 54 for connecting the data terminal; A telephone connection port 58 for connecting the telephone; A high pass filter 56 for selectively passing only the downlink data signal among the combined downlink signals received through the subscriber outlet 40 and the plug 52 to supply to the data terminal connection port 54; And A low pass filter (59) for selectively passing only the downlink signal from the combined downlink signal to supply to the telephone connection port (58); Including; The uplink data signal from the data terminal and the uplink signal from the telephone are combined to transmit the combined uplink signal to the center module 20 through the subscriber outlet 40 and the telephone line. Data network. The system of claim 1 wherein the premises system 30 Parallel extension is installed before the at least one subscriber outlet 40, and increases the number of data terminals that can be used simultaneously through one telephone line by increasing the number of data terminal connection ports 54 in a parallel telephone line structure. And a module (70). 5. The premises system 30 of claim 4 wherein Installed between the parallel expansion module 70 and the at least one subscriber outlet 40, the number of data terminal connection ports (54, 78) in a serially connected telephone line structure by increasing the number of simultaneous use via one telephone line And a serial expansion module (70) for increasing the number of possible data terminals. The system of claim 1 wherein the premises system 30 It is installed before the at least one subscriber outlet 40 and increases the number of data terminal connection ports 54 and 78 in a serially connected telephone line structure, thereby increasing the number of data terminals simultaneously available through one telephone line. Serial expansion module (70); characterized in that it further comprises a data communication network. It is installed between the first to third transmission paths (L10, L20, L30) each of which is a four-wire telephone line, and receives the downlink data signal and the downlink signal through the first transmission path (L10) to the second Transmits through a transmission path L20 and the third transmission path L30, receives an uplink data signal and an uplink signal through the second transmission path L20 or the third transmission path L32, A data transmitting and receiving device for transmitting through one transmission path (L10), A two-terminal hub 62 each having an upward port, a first downward port, and a second downward port, each including a first and second terminal pairs; A first high pass filter (64) connected between the first line pair (L11) of the first transmission path (L10) and the first terminal pair of the up port of the two-terminal hub (62); A second high pass filter (66) connected between the first terminal pair of the first down port of the two-terminal hub (62) and the first line pair (L21) of the second transmission path (L20); A third high pass filter 67 connected between the first terminal pair of the second down port of the two-terminal hub 62 and the first line pair L31 of the third transmission path L30; And The first line pair L21 and the third line of the second transmission line L20 by low pass filtering the downlink signal received through the first line pair L11 of the first transmission line L10. The low pass filter 68 is supplied to the first line pair L31 of the transmission line L30 and low pass filters the uplink signal to supply the first line pair L11 of the first transmission line L10. ); Data transmission and reception device comprising a. A data transmission and reception device, which is provided between first and second transmission paths L20 and L40 each of which is a four-wire telephone line, and to which an external data terminal can be selectively connected, A two-terminal hub 72 each having an upstream port comprising a first and a second terminal pair, a first downport and a second downport; A first high pass filter (74) connected between the first line pair (L21) of the first transmission path (L20) and the first terminal pair of the up port of the two-terminal hub (72); A second high pass filter (76) connected between the first terminal pair of the first down port of the two-terminal hub (72) and the first line pair (L41) of the second transmission path (L40); And And a low pass filter 77 connected between the first line pair L21 of the first transmission line L20 and the first line pair L41 of the second transmission line L40. The external data terminal is connected to a second down port of the two-terminal hub 72; Receives a downlink data signal and a downlink signal through the first transmission line L20 to transmit the downlink data signal and the downlink signal to the second transmission line L40 and simultaneously transmits the downlink data signal to the external device. Transmits to a data terminal, receives the first uplink data signal and the first uplink signal from the second transmission line L40 and the second uplink data signal from the external data terminal and transmits the first uplink signal L20. Device for transmitting and receiving data. 9. The filter of claim 8, wherein the low pass filter (77) First and second nodes; First and second inductors connected between the first and second nodes and respective lines of the first line pair L21 of the first transmission line L20; And Third and fourth inductors connected between the first and second nodes and respective lines of the second line pair L41 of the second transmission line L40; Including; The telephone and data composite signal transmission and reception extension module has a telephone connection port connected to the first and second nodes and to which a telephone can be connected, so that the telephone and data composite signal transmission and reception extension module includes the downlink data signal and the downward connection. Accepts a telephone signal, transmits the downlink data signal and the downlink signal to the second transmission line L40, simultaneously transmits the downlink data signal to the external data terminal and transmits the downlink signal to the dial-up port. And receiving a second uplink signal from the dial-up port and transmitting the first uplink data signal, the first uplink signal, and the second uplink data signal to the first transmission line L20. Data transceiver.