JP2008219248A - Physical layer circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a local area network communication system using the existing telephone cord system. <P>SOLUTION: The local area network communication system is provided with a physical layer circuit provided in a network interface chip set of the local area network communication system to transmit and receive data through a telephone cord 403 to which a computer system connected to the chip set is connected. The physical layer circuit is provided with an encoder circuit 418 for encoding a signal to be transmitted into a proper format, a transmitter circuit 402 for transmitting an encoded signal to the telephone cord in an electricity form, a receiving filter 405 to which the telephone cord is connected and which receives an input signal and removes noise, an analog/digital converter 406 for converting the input signal from an analog signal into a digital signal to form a code, a clock signal generator 407 for generating a clock signal for the analog/digital converter, and a decoder circuit 416 for decoding the code generated by the analog/digital converter to an electronic signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a physical layer circuit applied to a communication system, a local area network communication system, a network interface chip set of the system, and the like. In particular, various computer devices and peripheral devices are connected to form a local area network communication system, which includes an existing telephone cord, a network interface chipset used in the local area communication network, and a network interface. The present invention relates to a local area network communication system for transmitting and receiving high-speed Ethernet packets using a physical layer circuit of a chipset and a communication system so formed.

The rapid development of network communication technology has made network communication systems necessary equipment for almost every home and business. Many types of network interface cards and network interface chipsets for connecting computer devices are commercially available and provide wired or wireless data transmission functions for users.
There are mainly two types of network interface cards and network interface chip sets. There are a wireless type and a broadband type. The broadband type is cheaper and provides a wider band passing service. However, that type requires many cables. When the network is installed, another network cable is used to connect the network system. These cables are inconvenient to use and affect the interior decoration of offices and homes. Wireless network interface chipsets do not use cables but are expensive. The chipset provides a limited bandwidth and requires multiple computing devices to share the same bandwidth. In addition, network security of wireless networks is always a concern for all users.

  In addition to the above-described method, it has been proposed to use a power cord as a communication channel of a network system in a power supply system. Such network systems are relatively expensive and limit bandwidth. Such a system uses an existing power supply system network, but is in the bus circuit, limiting scalability. As another system of the network system, an existing telephone cord system is used as a communication channel. The most common product is the “Home PNA” product. However, home PNA products are not only costly, but also provide the narrowest bandwidth among almost all network systems. All these existing technologies are “half-duplex” systems.

  Looking at existing network communication systems, it can be concluded that the telephone code system may be the best choice to function as a communication channel for a network communication system. Part of this is that telephone cord systems have survived for decades, are low cost, and are already installed in almost every building. For the reasons described above, a hardware system that can make a network communication system using an existing telephone code system relatively inexpensive is desirable.

It is an object of the present invention to provide a new local area network communication system that uses an existing telephone code system to implement network communication.
It is another object of the present invention to provide a physical layer circuit that connects a telephone cord and a computer device so that the computer can send and receive data using the telephone cord.

It is still another object of the present invention to provide a physical Ethernet circuit that uses a telephone code system as a network communication system and that functions effectively with a general Ethernet MAC layer and their techniques.
Still another object of the present invention is to provide a communication system, a local area network communication system, and a network interface chip set using the physical layer circuit of the present invention.

  According to the present invention, a new physical layer circuit is provided that allows a computer device using a network interface card or a network interface chip set having the physical layer circuit of the present invention to send and receive data through a telephone code. A physical layer circuit may be provided in a network interface card or network interface chipset, the physical layer circuit being encoded with an encoder circuit that encodes a signal to be transmitted into a specific format for transmission. A transmitter circuit for supplying the received signal to the telephone cord in electrical form; a reception filter to which the telephone cord is connected to receive the input signal and remove noise from the received signal; and the input signal that is an analog signal An analog-to-digital converter for converting the signal into a digital code, a clock signal generator for generating a clock signal for the analog-to-digital converter, and a decoder for decoding the code generated by the analog-to-digital converter into an electrical signal A circuit.

  The present invention also provides a communication system comprising at least one telephone cord and a physical layer circuit connected to each of two terminals of the telephone cord and provided in each network interface chip set for a local area network. Disclose. The physical layer circuit can be provided in the network interface chip set or a network interface card having the network interface chip set. The physical layer circuit of the present invention allows a computer system connected to the network interface chipset to send and receive data through a telephone code. The physical layer circuit of the present invention comprises an encoder circuit that encodes a signal to be transmitted into a specific format for transmission, a transmitter circuit that supplies the encoded signal to a telephone code in electrical form, and the telephone code Are connected to receive the input signal and remove noise from the received signal, an analog-to-digital converter that converts the input signal that is an analog signal into a digital code, and the analog-to-digital conversion A clock signal generator for generating a clock signal for the device, and a decoder circuit for decoding the code generated by the analog / digital converter into an electric signal.

  The present invention provides a local area communication system comprising at least one telephone cord and a physical layer circuit connected to each of two terminals of the telephone cord and provided in each network interface chipset for a local area network. I will provide a. The physical layer circuit can be provided in the network interface chip set or a network interface card having the network interface chip set. The physical layer circuit of the present invention allows a computer system connected to a network interface chipset to send and receive data in full duplex or half duplex through a telephone cord. The physical layer circuit of the local area communication system of the present invention includes an encoder circuit that encodes a signal to be transmitted into a specific format for transmission, and a transmitter circuit that supplies the encoded signal to a telephone code in electrical form A reception filter that is connected to the telephone cord to receive an input signal and removes noise from the received signal; an analog-to-digital converter that converts the input signal that is an analog signal into a digital code; A clock signal generator for generating a clock signal for the analog / digital converter; and a decoder circuit for decoding the code generated by the analog / digital converter into an electric signal.

The present invention also discloses a network interface chipset for a local area communication system. The network interface chip set includes at least two physical layer circuits and a data exchange circuit that connects the two physical layer circuits. The physical layer circuit can be provided in a network interface chipset or a network interface card having a network interface chipset. The physical layer circuit of the present invention allows a computer system connected to a network interface chipset to send and receive data through a telephone code, and the physical layer circuit encodes a transmitted signal into a specific format for transmission. An encoder circuit for transmitting, a transmitter circuit for supplying the encoded signal to a telephone code in electrical form, and receiving the input signal to which the telephone code is connected and removing noise from the received signal Generated by a filter, an analog / digital converter that converts the input signal that is an analog signal into a digital code, a clock signal generator that generates a clock signal for the analog / digital converter, and the analog / digital converter A decoder circuit for decoding the code into an electrical signal.
The data exchange circuit can be any device that transmits data from a physical layer circuit to a specific physical layer circuit, and can be a hub, switch, router, or gateway.

The present invention also discloses a communication system comprising at least one telephone cord and a network interface chipset connected to two terminals of the telephone cord. The network interface chip set includes at least two physical layer circuits and a data exchange circuit that connects the two physical layer circuits. The physical layer circuit can be provided in a network interface chipset or a network interface card having a network interface chipset. A physical layer circuit enables a computer system connected to a network interface chipset to send and receive data through a telephone code, and the physical layer circuit encodes a transmitted signal into a specific format for transmission A circuit, a transmitter circuit for supplying the encoded signal in electrical form to a telephone cord, a reception filter to which the telephone cord is connected to receive an input signal and to remove noise from the received signal; An analog-to-digital converter that converts the input signal that is an analog signal into a digital code, a clock signal generator that generates a clock signal for the analog-to-digital converter, and the code generated by the analog-to-digital converter A decoder circuit for decoding into an electrical signal.
The data exchange circuit can be any device that transmits data from a physical layer circuit to another specific physical layer circuit, and can be a hub, switch, router, or gateway.

The present invention also discloses a local area communication system comprising at least one telephone cord and a network interface chipset connected to two terminals of the telephone cord. The network interface chip set includes at least one physical layer circuit and a data exchange circuit that connects the two physical layer circuits. The physical layer circuit can be provided in a network interface chipset or a network interface card having a network interface chipset. A physical layer circuit enables a computer system connected to a network interface chipset to send and receive data through a telephone code, and the physical layer circuit encodes a transmitted signal into a specific format for transmission A circuit, a transmitter circuit for supplying the encoded signal in electrical form to a telephone cord, a reception filter to which the telephone cord is connected to receive an input signal and to remove noise from the received signal; An analog-to-digital converter that converts the input signal that is an analog signal into a digital code, a clock signal generator that generates a clock signal for the analog-to-digital converter, and the code generated by the analog-to-digital converter A decoder circuit for decoding into an electrical signal.
The data exchange circuit can be any device that transmits data from a physical layer circuit to another specific physical layer circuit, and can be a hub, switch, router, or gateway.

The present invention also discloses a local area network communication system comprising at least one telephone cord and a network interface card connected to two terminals of the telephone cord. The network interface card includes at least two physical layer circuits and a data exchange circuit that connects the two physical layer circuits. The physical layer circuit can be provided in the network interface card. A physical layer circuit enables a computer system connected to a network interface card to send and receive data through a telephone code, the physical layer circuit encoding an transmitted signal into a specific format for transmission A transmitter circuit for supplying the encoded signal to a telephone cord in electrical form; a receiving filter to which the telephone cord is connected for receiving an input signal and removing noise from the received signal; and an analog An analog-to-digital converter that converts the input signal that is a signal into a digital code, a clock signal generator that generates a clock signal for the analog-to-digital converter, and the code generated by the analog-to-digital converter A decoder circuit for decoding into an electrical signal.
The data exchange circuit can be any device that transmits data from a physical layer circuit to another specific physical layer circuit, and can be a hub, switch, router or gateway.

According to the present invention, the physical layer circuit of the present invention is provided in a network interface card or network interface chipset so that a computer system connected to the network interface card can send and receive data through a telephone cord. Multiple physical layer circuits of the present invention can be provided in combination with multiple MAC (Media Access Control) layer circuits in hubs, switches, routers, and gateways. The telephone cord can be connected to the assembly obtained in such a combination, and full-duplex or half-duplex point-to-point network communication through the telephone cord using the resulting assembly can be realized. . A plurality of assemblies having physical layer circuitry of the present invention can be connected to form a network communication system that uses telephone cords as communication system channels. If necessary, the number of telephone cords and physical layer circuits can be added without limitation. In this way, a network communication system that is convenient, low-cost, and expandable is realized.
These and other objects and advantages of the present invention can be clearly understood from the detailed description with reference to the following drawings.

In the following, several embodiments of the present invention will be described in order to illustrate the application of the present invention. The detailed description of the invention does not limit the scope of protection.
FIG. 1 shows a systematic schematic diagram of a local area network communication system according to one embodiment of the present invention. FIG. 1 illustrates how a physical layer circuit is used in a network interface chipset of a local area network in the case of a home local area network. Those skilled in the art will readily understand that the physical layer circuitry, network interface chipset, and local area network of this example can be used for any type of organizational or non-organized complex. The

  As shown in the figure, a broadband loop 500, which can be a copper cable or an optical fiber, is introduced from the outside, and then the first contact, ie the first physical layer circuit, of the network interface chipset 510 of the local area network system. Connected (not shown). The other end of the loop can be connected to a computer system of a system connection service company of a high-speed wideband network, and the network interface chip set (not shown) of this embodiment or other appropriate transmission / reception device is connected to the contact point. Provided. In this figure, the network interface chipset 510 of the local area system is shown connected to three home units 520, 530, 540 through three local telephone cords 501, 502, 503.

  FIG. 2 illustrates a block diagram of a network interface chipset for a local area network system according to one embodiment of the present invention. As shown in this figure, the network interface chip set of this embodiment includes a switch structure 517, several physical layer circuits 511, 512, and 513, and the same number of MAC layer circuits 514 as those physical layer circuits. 515, 516. Corresponding physical layer circuits 511, 512, and 513 are connected to the telephone cords 501, 502, and 503 introduced from the outside. Each pulse signal, which is always a voltage signal, transmitted through the telephone code 501, 502, 503 into the local area network is converted to an electronic signal by the physical layer circuit, decoded, and then the MAC layer circuit 514, 515, 516 is transmitted. These signals are then transmitted to the switch circuit 517 so that they can be transmitted to the corrected destination through the selected assembly of physical layer circuits and MACs and the telephone code connected to them. In this embodiment, the switch circuit 517 can be a router or a gateway. The main function of the switch circuit 517 is to correct and transmit electronic signals to a plurality of communication networks. It will be apparent to those skilled in the art that any type of switch actuation circuit can be used in this embodiment to provide an equivalent function.

  Reference is now made to FIG. The local area network telephone cord connecting the network interface chipset 510 extends to the corresponding home unit 520, 530, 540 and connects to the network interface card or network interface chipset of the corresponding home unit. As shown, the other contacts of the network interface chipset 531 are connected to the telephone cord, which is then located in the personal computer 532, camera 533, TV 534, Internet telephone 535, and other rooms. Connected to network interface chipset 536. As described above, the structure of the network interface chip set 531 is the same as, similar to, or compatible with the network interface chip set 510. The only possible difference between these chipsets is the number of ports connected or the type of equipment such as routers, switches, hubs, gateways. Further, the personal computer 532 is located in the first room, and the network interface chipset 536 is located in the second room. The printer 537 in the third room and the computer 538 in the second room are connected to the NAS (network access storage device). ) Connect to 539. Among them, the network interface chipset 536 has the same or similar structure as described above. Therefore, the details are omitted. In addition, the connection line connecting the computer device and the network device is a telephone cord in this embodiment. It can be seen that all or part of the telephone cord can be replaced by other types of connection lines. If the connection line is not a telephone cord, the physical layer circuit will need some modification accordingly. However, the main purpose of this embodiment is to use the telephone cord as at least part of the connection line of the local area communication system.

  FIG. 3 shows a block diagram of a physical layer circuit for a network interface chip of a local area network communication system according to an embodiment of the present invention. As shown in this figure, the physical layer circuit is implemented in a network interface chip for a local area network system so that a computer device connected to the network interface chip set can easily transmit and receive data through the telephone code 403. Or provided in a network interface card having such chipset (s). The physical layer circuit includes an encoder circuit 418 that encodes a signal to be transmitted into a particular format for transmission, a transmitter circuit 402 that supplies the encoded signal to a telephone code in electrical form, and the telephone code Are connected, receive the input signal and remove noise from the received signal, a receive filter 405, an analog-to-digital converter 406 that converts the input signal, which is an analog signal, into a digital code, and the analog-digital A clock signal generator 407 for generating a clock signal for the converter; and a decoder circuit 416 for decoding the code generated by the analog / digital converter into an electric signal.

  FIG. 4 illustrates a detailed block diagram of a physical layer circuit for a network interface chip of a local area network system according to one embodiment of the present invention. In this figure, an example of a physical layer circuit for a network interface chip of a local area network system useful for this embodiment is shown. The schematic diagram of the physical layer circuit for the network interface chip of the local area network system of the present embodiment has the following on its transmitting side.

A signal modulator 401 that modulates an electronic signal input from the MAC into a voltage signal and adds error control in the input signal by transmission or modulation so that the electronic signal is suitable for transmission in a communication network. The modulator 401 can be, for example, a lattice code modulator or other suitable modulation circuit.
Also shown in the schematic is a transmitter circuit 402 that receives the modulated voltage signal at its transmitter side and transmits the signal to a telephone code 403 so that the signal is transmitted to a remote destination through the telephone code. Have. The transmitter circuit useful in the present invention can be a digital-to-analog converter or a transmission filter. Since these circuits are known to those skilled in the art, a detailed description thereof will be omitted.

  The schematic also has, on its transmitting side, a first internal echo generator circuit 404 that generates an echo signal to cancel the external echo voltage in the voltage signal generated by the transmitter circuit 402. After cancellation, the residual echo is canceled by the echo cancellation circuit 412. This is because a pair of telephone cords are used to maintain full-duplex signaling, and the transmitted signal is returned to the receiving circuit that forms the pair of signals at the transmitter. Therefore, it is necessary to remove the echo. Adapted echo cancellation circuits include any commercially available product. The signal after the above processing is transmitted through the telephone code 403.

In the schematic diagram, the following components are provided on the receiving side.
In order to receive a signal input from the outside through the telephone cord 403, a filter 405 connected to the telephone cord 403 is provided. The filter 405 removes noise from the signal to obtain an effective component of the signal. Generally speaking, the filter used in this circuit can be a commercially available low-pass filter. Of course, other filters can be used in this embodiment as long as the data components in the input signal can be properly extracted.

An analog to digital converter circuit 406 is also provided for converting the received signal into a digital voltage signal. The converter 406 may be a known technique or circuit, such as a commercially available gain variable controlled analog to digital converter.
A clock signal generator 407 is also provided for transmitting the clock signal to the analog-to-digital converter circuit so that the digital signal generated by the analog-to-digital converter can be an appropriate form of electronic signal. The clock signal generator 407 can be a PLL (phase lock loop) or any circuit capable of generating a stable clock signal. In general, a timing recoverer 408 can be used to adjust the frequency and phase of the clock signal.

A voltage sensor 409 that detects the output voltage of the analog to digital converter circuit 406 is also provided so that the analog to digital converter circuit 406 can operate normally.
A power sensor 410 that detects the power of the received signal is also provided to determine whether the communication line is connected to or disconnected from the power source of the received signal.
An FFE (Feed Forward Equalizer) 411 is also provided that reduces intersymbol interference of received symbols.

A digital echo cancellation circuit 412 is also provided that reduces echoes in the received signal in accordance with the transmitted known signal.
A DC cancellation compensation circuit 413 is also provided that performs DC cancellation compensation on the received signal so that the missing DC signal in transmission can be compensated.
A slicer 414 is also provided for slicing the received signal after computation to determine the digital symbol represented by the received signal. The slicer circuit 414 can be any known slicer circuit. For example, the digital symbol of the transmission signal can be set to 1, 0, and -1. If the result of the operation is greater than 0.5, the corresponding signal is 1. If the result is between -0.5 and 0, the signal is 0, and if it is less than -0.5, it is -1.

A DFE (Decision Feedback Equalizer) 415 is also provided that takes the signal sampled by the slicer 414 and then feeds the signal back to the node 417. The signal is added to the outputs of the FFE 411 and the digital echo cancellation circuit 412 and then transmitted to the slicer 414.
A decoder 416 is also provided that decodes the signal sliced by the slicer 414 in a predetermined manner so that the signal can be recognized by downstream circuitry. The decoder 416 can be any conventional decoder that uses known decoding rules. However, a Viterbi decoder is preferred in this embodiment so that the system of this embodiment can be adapted to other communication systems. Of course, other decoders or decoding rules are used in certain situations. Custom decoding techniques can also be used. The signal resulting from the decoding is transmitted to the MAC circuit.

A circuit having the above-described structure processes a signal in the following manner.
A signal input from the telephone code 403 is filtered by the first filter 405 to obtain a data component. A signal which is an analog signal is converted into a digital signal by an analog / digital converter 406 and then sampled based on a clock signal generated by a clock signal generator 407. Next, the signal is equalized by the equalizer 411 and sliced by the slicer 414. The signal thus obtained is transmitted to the decoder circuit 416, and the content of the signal is obtained. Thus, the signal is in a form that can be processed by a computer device. These signals are transmitted to the MAC circuit (FIG. 2) and deframed. The resulting signal is sent to a hub, switch, router, or gateway and sent to the destination MAC circuit where they are framed and then sent to the corresponding physical layer circuit. The
The transmitted signal is an electronic signal. Those signals enter the physical layer to be transmitted to a computer device, communication device, or peripheral device connected to a telephone cord 403, modulated into a voltage signal by a modulator 401, and then telephoned by a transmitter circuit 402. It is transmitted to the code 403.

  The circuit described above is connected at two terminals of the telephone cord of the existing landline telephone system and properly performs full-duplex or half-duplex data exchange without the need for a dedicated network cable. can do. In a telephone cord terminal, the network interface chipset can provide multiple physical layer circuits and a corresponding number of MAC circuits, in addition to at least one of an adaptable hub, switch, router and gateway. The network interface chipset can be easily connected to other communication terminals by wire or wireless through a telephone cord or other connection. A local area network having the above structure can use telephone codes on all or part of the communication line in combination with the communication line or radio channel. The resulting communication system can be expanded at low cost and is modular.

In the hub, switch, router, or gateway, a plurality of physical layer circuits of this embodiment can be used in combination with a plurality of MAC layer circuits. The assembly is connected to a regular telephone cord to allow network communication between terminals. This overall system can be organized into a local area network to provide a convenient and economical full-bandwidth network communication service. Since the number of telephone cords can be added by adding the number of physical layer circuits, the number of telephone cords to be connected is almost not limited. Therefore, a scalable communication system is realized.
While the invention has been illustrated and described with reference to preferred embodiments thereof, those skilled in the art will recognize that these and other variations can be practiced without departing from the spirit and scope of the invention. It is obvious.

1 shows a systematic schematic diagram of a local area network communication system according to one embodiment of the present invention. FIG. 1 shows a block diagram of a network interface chipset for a local area network system according to one embodiment of the present invention. FIG. 1 is a block diagram of a physical layer circuit for a network interface chip of a local area network communication system according to an embodiment of the present invention. FIG. 1 is a detailed block diagram of a physical layer circuit for a network interface chip of a local area network system according to an embodiment of the present invention. FIG.

Explanation of symbols

  401: Signal modulator, 401: Modulator, 402: Transmitter circuit, 403: Telephone code, 404: Internal echo generator circuit, 405: Filter, 406: Analog to digital converter, 407: Clock signal generator, 408: Timing recovery unit, 409: voltage sensor, 410: power sensor, 411: FFE, 412: echo cancellation circuit, 413: DC cancellation compensation circuit, 414: slicer, 415: DFE, 416: decoder, 417: node, 418: encoder Circuit: 500: Broadband loop, 501, 502, 503: Telephone code, 510: Network interface chipset, 511, 512, 513: Physical layer circuit, 514, 515, 516: MAC layer circuit, 517: Switch circuit, 520, 530, 540: household unit, 531 Network interface chip set, 532: personal computer, 533: camera, 534: TV, 535: Internet Phone, 536: network interface chip set, 537: printer, 538: computer, 539: NAS

Claims (11)

A computer device provided in a network interface chip set of a local area network communication system and connected to the network interface chip set is a physical layer circuit capable of transmitting and receiving data through a connected telephone cord,
An encoder circuit that encodes a signal to be transmitted into a code of an appropriate format for transmission;
A transmitter circuit for transmitting the encoded signal in electrical form to the telephone code;
A reception filter connected to the telephone cord for receiving an input signal and removing noise from the input signal;
An analog-to-digital converter that converts the input signal from an analog signal to a digital signal to form a sign;
A clock signal generator for generating a clock signal for the analog-digital converter;
A decoder circuit for decoding the code generated by the analog-digital converter into an electronic signal;
A physical layer circuit comprising: In a communication system comprising at least one telephone cord and a physical layer circuit connected to each of two terminals of the telephone cord,
The physical layer circuit is provided in a network interface chipset of a local area network and enables transmission and reception of data through the telephone code of a computer device connected to the network interface chipset;
An encoder circuit that encodes a signal to be transmitted into a code of an appropriate format for transmission; a transmitter circuit that transmits the encoded signal in electrical form to the telephone code; and Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A communication system comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal. In a local area network communication system comprising at least one telephone cord and a physical layer circuit connected to each of two terminals of the telephone cord,
The physical layer circuit is provided in a network interface chipset of the local area network communication system, and is capable of full-duplex or half-duplex data passing through the telephone cord of a computer device connected to the network interface chipset. Enables sending and receiving,
An encoder circuit that encodes a signal to be transmitted into a code in a format suitable for transmission; a transmitter circuit that transmits the encoded signal in electrical form to a telephone code; and the telephone code. Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A local area network communication system comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal. A network interface chip set for a local area network communication system, comprising: at least two physical layer circuits; and at least two data exchange circuits connected to the physical layer circuits;
The data exchange circuit transmits data input from one physical layer circuit to a destination physical layer circuit,
The physical layer circuit enables transmission and reception of data through the telephone code of a computer device connected to the network interface chipset;
An encoder circuit that encodes a signal to be transmitted into a code in a format suitable for transmission; a transmitter circuit that transmits the encoded signal in electrical form to a telephone code; and the telephone code. Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A network interface chip set comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal.   5. The network interface chip set according to claim 4, wherein the data exchange circuit comprises any one selected from the group consisting of a hub, a switch, a router, and a gateway. A communication system comprising at least one telephone cord and a network interface chipset connected to two terminals of the telephone cord,
The network interface chipset includes at least one physical layer circuit and a data exchange circuit connecting at least two of the physical layer circuits,
The data exchange circuit transmits data input from one physical layer circuit to a designated physical layer circuit,
The physical layer circuit enables transmission and reception of data through a telephone cord of a computer device connected to the network interface chipset,
An encoder circuit that encodes a signal to be transmitted into a code in a format suitable for transmission; a transmitter circuit that transmits the encoded signal in electrical form to a telephone code; and the telephone code. Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A communication system comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal.   The communication system according to claim 6, wherein the data exchange circuit comprises any one selected from the group consisting of a hub, a switch, a router, and a gateway. A local area network communication system comprising at least one telephone cord and a network interface chipset connected to two terminals of the telephone cord,
The network interface chipset includes at least two physical layer circuits and a data exchange circuit that connects the at least two physical layer circuits,
The data exchange circuit transmits data input from one physical layer circuit to a designated physical layer circuit,
The physical layer circuit enables transmission and reception of data through a telephone cord of a computer device connected to the network interface chipset,
An encoder circuit that encodes a signal to be transmitted into a code in a format suitable for transmission; a transmitter circuit that transmits the encoded signal in electrical form to a telephone code; and the telephone code. Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A local area network communication system comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal.   9. The local area network communication system according to claim 8, wherein the data exchange circuit comprises any one selected from the group consisting of a hub, a switch, a router, and a gateway. At least one telephone cord, a first network interface chipset connected to one end of the telephone cord, and a physical layer connected to the other end of the telephone cord and provided in the second network interface chipset A local area network communication system comprising a circuit,
The second network interface chip set includes at least two physical layer circuits and a data exchange circuit connecting at least two of the physical layer circuits,
The data exchange circuit transmits data input from one physical layer circuit to a designated physical layer circuit,
The physical layer circuit enables transmission and reception of data through a telephone cord of a computer device connected to the network interface chipset,
An encoder circuit that encodes a signal to be transmitted into a code of an appropriate format for transmission; a transmitter circuit that transmits the encoded signal to a telephone code in electrical format; and the telephone code Are connected to receive the input signal and remove noise from the input signal, an analog-to-digital converter that converts the input signal from an analog signal to a digital signal, A local area network communication system comprising: a clock signal generator for generating a clock signal for a digital converter; and a decoder circuit for decoding a code generated by the analog / digital converter into an electronic signal.   The local area network communication system according to claim 10, wherein the data exchange circuit comprises any one selected from the group consisting of a hub, a switch, a router, and a gateway.

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