KR20000073406A - Device for LAN Data Transmission through voice telephone lines - Google Patents

Abstract

PURPOSE: A device for transmitting local area network(LAN) data through a telephone line is provided to deliver telephone signals through a low pass filter and deliver LAN data signals through a high pass filter, by using characteristics of the telephone signals and the LAN data signals, so that high-speed Internet service be provided through an existing telephone subscriber network. CONSTITUTION: A center module(200) combines a local area network(LAN) data signal and a telephone signal. A subscriber module(100) mutually separates the LAN data signal and the telephone signal. A first line(300) combines the telephone signal with one of a transmitting signal and a receiving signal of the LAN data through two lines, among four telephone lines connecting the center module and the subscriber module. A first direct current(DC) interrupter(120) interrupts DC power supplied through the first line. A first low pass filter(130) passes low-frequency components in the first line, to separate the telephone signal. A first high pass filter(110) passes high-frequency components, to separate the LAN data signal. A second DC interrupter(220) interrupts DC power led through the first line. A second low pass filter(230) passes low-frequency components in the first line, to combine the telephone signal. A second high pass filter(210) passes high-frequency components, to combine the LAN data signals.

Description

Device for LAN Data Transmission through voice telephone lines

The present invention relates to a LAN data transmission apparatus through a telephone line, and more particularly, to a LAN data transmission apparatus through a telephone line that enables simultaneous transmission of telephone data and LAN data using a local telephone line already installed in a subscriber network. will be.

Internet service is becoming an indispensable service in information and communication that is used as a means of collecting and transmitting various information. As such, in order to use the Internet service, an Internet network must be connected.

Currently, there is a method for high-speed Internet service using a DSL modem using a two-wire telephone line existing in a subscriber network and a cable modem using a coaxial cable, or using an optical subscriber network and a wireless subscriber network. In order to transmit the data, the data signal is mainly mapped to amplitude, frequency, and phase information of a predetermined frequency signal and then transmitted through a telephone line medium. In this way, modulation techniques such as QPSK, QAM, and DMT are widely used in digital communication systems.

However, the system employing this technique is not only very complicated and many signal processing during the modulation process, but also the frame header or trailer structure at the physical layer and link layer to have error correction function according to the attenuation, distortion and noise inflow of the signal transmission line. It has a characteristic that the firmware and software for this is complicated.

Therefore, without applying the modulation / demodulation technique, a system that combines and separates the two signals according to the characteristics of the telephone signal and the LAN data signal on the telephone line, and adds the serial data to the telephone line, or the data signal to the telephone line by the FSK modem Although there was a system that added up, it did not handle 10 Mbps Ethernet signals.

To solve these problems, a technique for combining and separating telephone signals and LAN data signals for transmitting telephone signals and LAN data through a two-wire telephone line is disclosed in US Pat. No. 5,841,841. There is a problem in that it is difficult to couple the input signal and the output signal, and it does not operate in a full duplex method but operates in a half duplex method.

The present invention has been made to solve the above problems, and an object of the present invention is to use a four-wire telephone line already established in the subscriber network to enable simultaneous transmission of the telephone signal together with the Ethernet transmission and reception signal to the Ethernet signal is full duplex The present invention provides a LAN data transmission apparatus over a telephone line that is operated in a manner and is efficient and simple, and does not require power supply from a subscriber device.

1 is a circuit diagram showing a LAN data transmission apparatus via a telephone line according to the present invention.

2 is a circuit configuration diagram configured to simultaneously transmit two-line telephones as another embodiment of a LAN data transmission apparatus through a telephone line according to the present invention.

-Explanation of symbols for the main parts of the drawings-

100: subscriber module 200: center module

110, 210, 115, and 215: first to fourth high pass filters

120, 220, 125, 225: first to fourth DC circuit breakers

130, 230, 135, and 235: first to fourth low pass filters

300, 310: first and second lines

240, 245: first and second equalization amplifiers

400: switching hub

The present invention for realizing the above object is a center module connected to the switching hub and coupled to the LAN data signal and the telephone signal to each other, a subscriber module connected to the subscriber equipment to separate the LAN data signal and the telephone signal from each other, the center Four-line telephone line connecting the center module and the subscriber module with the first line for connecting any one of the transmission signal and the reception signal of the LAN data together with the telephone signal, and the four-line telephone line connecting the module and the subscriber module to each other. A second line for transmitting only one of a transmission signal and a reception signal of the LAN data to the other two lines, and a first line installed in the subscriber module and connected to the first line to block DC power introduced through the first line. It is installed in the DC circuit breaker and the subscriber module to pass the low frequency components through the first line in front of the first DC circuit breaker. A first low pass filter for separating the signal, a first high pass filter installed in the subscriber module and installed at the rear of the first DC circuit breaker to separate the LAN data signal through high frequency components, and installed in the center module. A second DC circuit breaker for disconnecting DC power connected to the first line and introduced through the first line; and a telephone signal installed in the center module to pass a low frequency component in the first line of the front end of the second DC circuit breaker to couple telephone signals And a second high pass filter installed in the center module and installed at the rear end of the second DC circuit breaker to pass the high frequency components to couple the LAN data signal.

In addition, the center module further includes an equalization amplifier installed in front of the second high pass filter for signal distortion or noise processing caused by the increase of the first line distance.

It is also possible to combine and transmit two lines of telephone signals by configuring telephone signals to be coupled to both the first and second lines.

Referring to the operation of the present invention made as described above are as follows.

Through the 4-wire telephone line connecting the subscriber module and the center module, the center module transmits the LAN data signal and the telephone signal through the high pass filter and the low pass filter in the center module according to the characteristics of each signal. In the signal transmitted by combining LAN data signal and telephone signal, the two signals are separated by high pass filter and low pass filter according to the characteristics of each signal to transmit and receive LAN data signal and telephone signal. It works by allowing you to send and receive LAN data signals and telephone signals simultaneously.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.

1 is a circuit diagram showing a LAN data transmission apparatus via a telephone line according to the present invention.

As shown here, the center module 200, which is located in a line distribution room in a building or apartment complex, is connected to a switching hub 400 connected to the Internet network to couple LAN data signals and telephone signals to each other, and the subscriber's home. Subscriber module 100 connected to the installed subscriber equipment to separate the LAN data signal and the telephone signal from each other, and the transmission signal of the LAN data in two lines among the four-wire telephone lines connecting the center module 200 and the subscriber module 100 to each other. And a first signal 300 for transmitting the sum of the received signal and the telephone signal, and a transmission signal for the LAN data to the other two lines among the four-wire telephone lines connecting the center module 200 and the subscriber module 100 to each other. The second line 310 that transmits only one of the received signals, and is installed in the subscriber module 100 and connected to the first line 300 to cut off the DC power introduced through the first line 300 A first low pass filter installed in the subscriber module and a first low pass filter for separating a telephone signal by passing a low frequency component in a first line 300 in front of the first DC breaker 120. 130 and a first high pass filter 110 installed in the subscriber module 100 and installed at the rear end of the first DC circuit breaker 120 to separate the LAN data signal through high frequency components, and the center module 200. A second DC circuit breaker 220 installed in the center module 200 and connected to the first line 300 to block DC power introduced through the first line 300, and a second DC circuit breaker ( The second low pass filter 230 for coupling the telephone signal by passing the low frequency component in the first line 300 in front of the 220, and the center module 200 is installed in the rear end of the second DC circuit breaker 220. A second high frequency band for coupling the LAN data signal by passing high frequency components It comprises a filter 210, a center module 200, a second high-pass filter 210, a first equalization amplifier 240 provided in the front end for a signal distortion and noise processing is generated in accordance with the increase in the distance telephone line.

Therefore, in order to combine and separate telephone signals and Ethernet data signals using four telephone lines, the frequency components of the voice bandwidth are mostly distributed below 4 KHz, and the 10 Mbps Ethernet data varies slightly depending on the arrangement of data. Transmitted by the first low pass filter 130 and the second low pass filter 230 to separate the tip and ring signals generated from the telephone signal terminal based on a well-known technique of being in a high frequency band above the band, Ethernet The 10-BaseT interface is connected to four lines of the first line 300 and the second line 310 and transmitted through the first high pass filter 110 and the second high pass filter 210.

In addition, since a -48 V voltage is flowing on the telephone line, the first DC circuit breaker 120 and the second DC circuit breaker 220 are inserted to prevent excessive current blocking to the Ethernet port.

Referring to the operation of the present embodiment made as described above are as follows.

On the subscriber module 100 side, outgoing signals (Tx +, Tx-) of (Tx +, Tx-, Rx +, Rx-) signals of the Ethernet LAN interface part of the subscriber's personal computer (PC) or server are a three-stage first high pass filter ( HPF) through the first DC circuit breaker 120 is coupled to the telephone voice signal passed through the first low pass filter 130 (LPF) and transmitted through the first two lines 300 of the Ethernet LAN interface, The received signals Rx + and Rx− are transmitted to the center module 200 through the second two lines 310 of the remaining two strands.

In addition, in the opposite principle, the Ethernet receiving lines Rx + and Rx- of the subscriber module 100 of the four telephone lines are first connected to the Ethernet transmission terminals of the switching hub 400 located at the center module 200. The second signal is connected to the second line 310 at Tx + and Tx-, and the second low pass filter 230 separates the voice signal and the Ethernet data signal through the remaining two strands of the first line 300. And the Ethernet data signal is separated by the second high pass filter 210. In addition, the data line is separated by the second DC circuit breaker 220 to prevent excessive current flowing into the -48V Ethernet port on the telephone line.

In addition, the center module 200 may be provided with an equalization amplifier 240 in front of the second high pass filter 210 to process the signal distortion or noise generated by the increase in the telephone line distance. This may be added to the subscriber module 100, but in this case, a separate power source is required for the subscriber module 100.

2 is a circuit configuration diagram configured to simultaneously transmit two-line telephones as another embodiment of a LAN data transmission apparatus through a telephone line according to the present invention.

As shown here, the first line 300 and the second line 310 are both provided with the first line signal T1 and the second line signal T2 to simultaneously transmit the LAN data signal. And to combine and separate the telephone signal and the second telephone signal.

That is, the center module 200, which is located in a line distribution room in a building or apartment complex, is connected to a switching hub to couple the LAN data signal, the first telephone signal T1 and the second telephone signal T2 to each other, and the subscriber side. The subscriber module 100 and the center module 200 and the subscriber module 100 which are located in the home and are connected to the subscriber equipment to separate the LAN data signal, the first telephone signal T1 and the second telephone signal T2 from each other. It is composed of two pairs of four wire telephone lines connecting each other, and one of the transmission signal and the reception signal of the LAN data and the first telephone signal T1 are converted into the other signal and the second telephone signal of the transmission signal and the reception signal of the LAN data. The first line 300 and the second line 310 to transmit the sum (T2) and are installed in the subscriber module 100 and connected to the first line 300 and the second line 310 and connected to the first line (T2). 300) and to cut off the DC power introduced through the second line 310 The first and third DC circuit breakers 120 and 125 and the first line 300 and the second line 310 installed in the subscriber module 100 in front of the first and third DC circuit breakers 120 and 125. And the first and third low pass filters 130 and 135 for separating the first telephone signal T1 and the second telephone signal T2 by passing the low frequency component at First and third high pass filters 110 and 115 installed at the rear end of the first and third DC circuit breakers 120 and 125 to separate the LAN data signal through high frequency components and the center module 200. Second and fourth DC circuit breakers installed inside the first line 300 and the second line 310 to cut off the DC power introduced through the first line 300 and the second line 310 ( 220 and 225 are installed in the center module 200 to pass the low frequency components through the first line 300 and the second line 310 in front of the second and fourth DC circuit breakers 220 and 225. First telephone signal T1 and second telephone Second and fourth low pass filters 230 and 235 for coupling the signal T2, and are installed in the center module 200 and installed after the second and fourth direct current circuit breakers 220 and 225, Data is passed through the second and fourth high pass filters 210 and 215 for coupling the LAN data signal through the components, and the second and fourth high pass filters 210 and 215 in the center module 200. It consists of first and second equalization amplifiers 240 and 245 for amplifying the LAN data signal upon transmission.

As above, it can be configured to transmit two phone signals and LAN data signal simultaneously through all four-wire telephone lines.

Therefore, any one of the transmission and reception of the first telephone signal T1 and the LAN data signal through the first line 300 and the transmission of the second telephone signal T2 and the LAN data signal through the second line 310. The other signal of transmission and reception can be transmitted simultaneously.

As described above, the present invention can be easily constructed in a building, an apartment complex, a shopping mall, a hotel, and the like by using four telephone lines provided with an Ethernet network of 10 Mbps, and is operated in a full-duplex manner. The advantage is that you can connect and send voice and data signals simultaneously.

Claims (4)

A center module connected to the switching hub and coupling the LAN data signal and the telephone signal to each other; A subscriber module connected to the subscriber equipment and separating the LAN data signal and the telephone signal from each other; A first line for adding and transmitting any one of a transmission signal and a reception signal of LAN data to two lines of a four-wire telephone line connecting the center module and the subscriber module to each other; A second line for transmitting only one of a transmission signal and a reception signal of LAN data to another two lines of a four-wire telephone line connecting the center module and the subscriber module to each other; A first DC circuit breaker installed in the subscriber module and connected to the first line to cut off DC power introduced through the first line; A first low pass filter installed in the subscriber module for separating a telephone signal by passing low frequency components in the first line in front of the first DC circuit breaker; A first high pass filter installed in the subscriber module and installed at a rear end of the first DC circuit breaker to separate a LAN data signal through a high frequency component; A second DC circuit breaker installed in the center module and connected to the first line to cut off DC power introduced through the first line; A second low pass filter installed in the center module to pass a low frequency component in the first line of the front end of the second DC circuit breaker to couple a telephone signal; A second high pass filter installed in the center module and installed at a rear end of the second DC circuit breaker to pass a high frequency component to couple LAN data signals; Characterized in that consisting of. 2. The LAN of claim 1, further comprising an equalization amplifier installed at a front end of the second high pass filter in the center module to handle signal distortion or noise generated by an increase in telephone line distance. Data transmission device. A center module connected to the switching hub and coupling the LAN data signal with the first telephone signal and the second telephone signal; A subscriber module connected to the subscriber equipment and separating the LAN data signal, the first telephone signal and the second telephone signal from each other; A pair of four-wire telephone lines connecting the center module and the subscriber module to each other is configured in pairs so that any one of the transmission signal and the reception signal of the LAN data and the first telephone signal are connected to the other signal of the transmission signal and the reception signal of the LAN data. A first line and a second line for adding and transmitting a second telephone signal; First and third DC circuit breakers installed in the subscriber module and connected to the first line and the second line to block DC power introduced through the first line and the second line; First and third devices installed in the subscriber module for separating the first telephone signal and the second telephone signal by passing low frequency components in the first line and the second line in front of the first and third DC circuit breakers; Low pass filter, First and third high pass filters installed in the subscriber module and installed at the rear ends of the first and third direct current circuit breakers to separate LAN data signals through high frequency components; Second and fourth DC circuit breakers installed in the center module and connected to the first line and the second line to block DC power introduced through the first line and the second line; Second and fourth devices installed in the center module to pass the low frequency components in the first and second lines in front of the second and fourth DC circuit breakers to couple the first telephone signal and the second telephone signal; Low pass filter, Second and fourth high pass filters installed in the center module and installed at the rear ends of the second and fourth direct current circuit breakers to pass high frequency components to couple LAN data signals. LAN data transmission device via a telephone line, characterized in that consisting of. 4. The apparatus of claim 3, further comprising first and second equalization amplifiers installed at front ends of the second and fourth high pass filters in the center module to deal with signal distortion or noise generated by an increase in telephone line distance. LAN data transmission device via a telephone line, characterized in that.