KR100321114B1 - High-speed subscriber data transmission system using DS-based LAN modem - Google Patents

Abstract

The high-speed subscriber data transmission system using a local area network (LAN) modem, which is a synchronous transmission device of a DSL (Digital Subscriber Line) method, is a conventional telephone to telephone (TT), dial-up (Dial-Up) modem, Unlike asynchronous point-to-point protocol (PPP) services such as Integrated Services Digital Network (ISDN), the strengths of Ethernet communication are fast and inexpensive 24 hours a day at 64 Kbps (Kilo bit per seconds) to 144 Kbps. By supplementing the shortcomings of short distance communication, the subscriber line can be converted like a very long Ethernet cable to use PC communication and the Internet, and the Ethernet environment can be shared without additional equipment such as a router. In addition, the LAN environment can be extended to a wide area network (WAN).

The present invention provides a personal subscriber station which is installed on a personal computer (PC) to be connected via a telephone line when using the Internet, and a plurality of PCs, printers, etc. are connected via Ethernet, and an external LAN modem is installed on the Ethernet to provide a telephone line. A user terminal comprising a terminal of a SOHO subscriber which establishes a LAN environment connected through the terminal; And when a plurality of users using the user terminal simultaneously use the Internet, a set of modems corresponding to each user terminal one-to-one to control data transmission and reception between each user terminal and the Internet. If you want to use another user's PC, a collective LAN modem that performs a bridge function to connect another user's PC without using an internet network, and a plurality of ports of the collective LAN modem are connected. Dedicated to transmitting packets to enable communication between Ethernet and the Internet by connecting two or more networks, and for converting addresses between communication networks or protocols according to protocols. With router and data transmission line It consists of an Internet service provider devices.

Therefore, the present invention can be connected to the individual or multiple users at all times like a dedicated line, network configuration without expensive terminal server or router, and can extend the LAN environment to WAN, TCP / It supports all LAN protocols such as IP and IPX, and it is easy to segment and manage LAN by installing bridge function, and the efficiency of circuit is increased because 2-wire is used as subscriber line.

Description

High speed subscriber data transmission system using DSL LAN modem

The present invention relates to a high-speed subscriber data transmission system using a local area network (hereinafter, referred to as a LAN) modem of a digital subscriber line (hereinafter, referred to as a DSL).

More specifically, it provides a dedicated line service using a LAN modem, which is a DSL synchronous transmission device, and includes a conventional private line service (TT), a dial-up modem, an integrated services digital (ISDN). Unlike Asynchronous Point-to-Point Protocol (PPP) service such as Network, etc., it is able to improve the strength of Ethernet communication with 64 Kbps (Kilo bit per seconds) to 144Kbps at any time for 24 hours. It can be used to make the shortcomings of short distance communication and convert the subscriber line like a very long Ethernet cable to use PC communication and the Internet, and to share the Ethernet environment without additional equipment such as router. Of course, high speed subscriber data transmission system using DSL type LAN modem to extend LAN environment to wide area network (WAN). Relate to.

Modern society is an information age where information is provided from so many places that it is buried in the flood of information that flows every day. This is the result caused by the expansion of computer communication network with the spread of PC.

Receiving information service using such a PC is called PC communication, and in order for general users to receive or exchange BBS service, e-mail, home shopping, games, and various information provisions using a PC communication, a modem or a dedicated line, etc. The company shall be connected to a company that provides PC communication services (for example, PC carriers such as Cheon Lian, Hitel, Unitel, etc.) in Korea through a public switched telephone network (PSTN).

In addition to the above-described PC communication, the computer network connected throughout the world also uses the Internet, which can be referred to as a network of networks.

Thus, users can share information provided from numerous computers connected to the Internet, called reporting of information, and can use services such as e-mail, file transfer, and the World Wide Web.

As described above, in order to use the Internet, users access the Internet through various methods, such as through an Internet service provider through a modem or a dedicated line, or through a PC communication service provider. The browser connects directly to an information provider (called an information provider, or server) to use or exchange information.

1 to 4 are diagrams for explaining various types of connection processes when using the PC communication or the Internet as described above.

FIG. 1 shows a connection process between a PC 1 and an Internet Service Provider (ISP) 3 using an analog modem of an analog-to-analog connection through a telephone exchange station 2, wherein a user accesses the Internet. When the telephone number of the Internet service provider 3 is inputted in order to use the PC, the PC 1 is connected to the Internet service provider 3 through the telephone exchange office 2 so that the Internet can be used.

At this time, data is transmitted between the PC 1 and the telephone exchange station 2, the telephone exchange station 2, and the Internet service provider 3 in an analog manner, and in the telephone exchange station 2, data is transmitted digitally.

The reason why the data transfer is digitally performed in the telephone exchange station 2 is that analog data applied from the PC 1 to the input / output terminal of the telephone exchange station 2 is digital data and digital data applied from the Internet service provider 3. This is because a codec 2A and 2B for converting into analog data are provided.

This analog-to-analog connection modem has the advantage of low cost, but it is slow because it can be connected up to 33.6 Kbps.

2 shows a connection process between a PC 4 and an Internet service provider 6 using a digital modem of an analog-digital connection method through the telephone exchange station 5, and the connection process when using the Internet is described above. Same as FIG. 1.

However, when compared with FIG. 1 mentioned above, the codec 5A is provided in the part connected with the PC 4 of the telephone exchange office 5, and the codec is connected in the part connected with the Internet service provider 6 of the telephone exchange station 5. In FIG. Since the data transmission between the telephone exchange office 5 and the Internet service provider 6 is made digital, the quality of the transmission path is increased when compared with the analog modem of the analog-analog connection method of FIG. This simplifies the network configuration and speeds up to 56Kbps, making it much faster.

3 shows a connection process between a PC 7 and an Internet service provider 9 using a digital connection type ISDN modem through a telephone exchange station 8, which is described in FIG. And the same as in FIG. 2.

The ISDN modem of the digital connection method is connected to a maximum of 128 Kbps, unlike the analog modem or digital modem described above, because the entire network configuration between the PC 7, the telephone exchange 8, and the Internet service provider 9 is digital. This is very fast and can support voice or video services in addition to data.

Finally, FIG. 4 is connected to the PC 10 through the telephone exchange station 11 using an asynchronous PPP scheme of a LAN environment in which a plurality of PCs 10 different from those described above with reference to FIGS. 1 to 3 are connected via Ethernet. The process of connecting between the Internet service providers 12 is shown.

The above-described Internet service provider 12 is a modem pool, which is a set of modems that enable the transmission and reception of data in a one-to-one correspondence for each user when a plurality of users using the PC 10 simultaneously use the Internet. 12A, Terminal Server 12B, which controls the transmission and reception of data between each user's PC 10 and the Internet via the modem pool 12A, and Ethernet, the standard connecting the PC and LAN. (12C) is responsible for transmitting packets to hardware and software devices that connect two or more networks to communicate from one network to another, translating addresses between networks or for protocols. The router 12D and the data transmission apparatus 12E, such as E1 and T1, are comprised.

When the user wants to use the Internet by the asynchronous PPP method, the user leases the Internet leased line from the domestic Internet service provider 12 and leases or purchases the leased line and the line terminating device from Korea Telecom. If you have a web server, you can directly build services such as homepage advertising and e-mail, and have your own domain name.

In the asynchronous PPP scheme configured as described above, when a user uses the Internet, a high speed Internet service of 56 Kbps to 128 Kbps can be used.

However, when accessing PC communication or the Internet using a conventional modem as described above, telephone charges are charged depending on the amount of use, and users are not only burdened, but even when using a leased line, the initial installation cost and expensive equipment rent and use are used. Due to the cost, the economic burden was felt. At the same time, when a large number of users use PC communication or the Internet, a bottle neck occurs due to an increase in line usage, which makes the user very uncomfortable using the communication.

In addition, the Internet service provider also has a problem that the economic burden because the equipment such as a terminal server that the Internet service provider must be very expensive.

An object of the present invention is to provide a dedicated line service using a LAN modem, which is a DSL synchronous transmission equipment, unlike conventional private line service, dial-up modem, ISDN asynchronous PPP service, etc., 24 hours at a communication speed of 64Kbps to 144Kbps. Utilize the strengths of Ethernet communications at any time, quickly and inexpensively, and compensate for the shortcomings of short-range communications so that subscriber lines can be converted into very long Ethernet cables, enabling PC communications and the Internet, and adding Ethernet to routers, etc. To provide high-speed subscriber data transmission system using DSL-type LAN modem that provides personal and SOHO (SOHO; Small Office & Home Office) so that it can be shared without equipment and can be used to extend LAN environment to WAN. have.

Another object of the present invention is to provide a variety of services, such as Telnet, File Transfer Protocol (FTP), E-mail, account service, Internet fax, and the like, TCP / IP (Transmission Control Protocol / High speed subscriber data transmission system using DSL type LAN modem that supports all LAN protocols such as Internet Protocol (IPX), InternetworkPacket eXchange (IPX), etc., and also enables bridge function to segment and manage LAN. To provide.

1 to 4 are views for explaining various types of connection processes when using general PC communication or the Internet, respectively.

5 is a diagram schematically showing a configuration of a high-speed subscriber data transmission system using a DSL type LAN modem according to the present invention;

6 is a block diagram showing in detail the configuration of the built-in LAN modem of FIG.

7 is a block diagram showing in detail the configuration of the external LAN modem of FIG. 5 described above;

FIG. 8 is a block diagram showing in detail the configuration of a collective LAN modem installed in the above-described Internet service provider of FIG.

Explanation of symbols on the main parts of the drawings

100: user 110: individual subscriber

111, 121: PC 112: internal LAN modem

120: Soho subscriber 122: Printer

123, 220: Ethernet 124: External LAN Modem

200: Internet service provider 210: collective LAN modem

230: router 240: data transmission device

300, 420: main memory 310, 425: HDLC controller

320, 430: ICC part 330, 435: IEC part

340, 405, 440: filter part 350, 445: connector (RJ-11)

360, 450: auxiliary memory unit 370, 465: hardware protection unit

380, 470, 540: display part 390, 475, 550: power supply part

400: connector (RJ-45) 410: LAN transceiver controller

415: microprocessor unit 455: address latch unit

460: flash memory unit 500: multiplexer module

510: LAN connector (RJ-48) 520: WAN connector (RJ-21)

530: control module

In the high-speed subscriber data transmission system using a DSL type LAN modem according to the present invention, a local area network (LAN) modem is installed in a personal computer (PC) and connected to a personal subscriber terminal via a telephone line when using the Internet. And a user terminal comprising a terminal of a SOHO subscriber which is connected to a plurality of PCs, printers, etc. via Ethernet, and has an external LAN modem installed on the Ethernet and is connected via a telephone line when using the Internet. And when a plurality of users using the user terminal simultaneously use the Internet, a set of one-to-one corresponding modems for each user terminal to control data transmission and reception between each user terminal and the Internet, and one user is different from his or her PC. If you want to use a user's PC, a collective LAN modem that performs a bridge function to connect and use another user's PC directly without connecting through the Internet network, and a plurality of ports of the collective LAN modem are connected It is dedicated to the transmission of packets for the communication between Ethernet and the Internet by connecting two or more networks with Ethernet which allows each user terminal to access the Internet at the same time. , Consisting of a data transmission line It is characterized by consisting of the Internet service providing apparatus.

Hereinafter, a high-speed subscriber data transmission system using a DSL type LAN modem of the present invention will be described in detail with reference to the accompanying drawings.

5 is a diagram schematically showing a configuration of a high-speed subscriber data transmission system using a DSL type LAN modem according to the present invention.

As shown, the user 100 is a personal subscriber (PC) installed with a built-in LAN modem 112 (or an external LAN modem) is connected to the Internet service provider 200 to be described later via a telephone line when using the Internet ( 110, a plurality of PCs 121, printers 122, and the like are connected via Ethernet 123, and an external LAN modem 124 is installed on the Ethernet 123 to be described later through a telephone line when using the Internet. It consists of a group subscriber 120, such as Soho, which establishes a LAN environment to be connected to the network 200, and also includes an individual or a group using the Internet using an asynchronous PPP scheme, although not shown in the drawing.

The Internet service provider 200 controls the data transmission and reception between each user 100 and the Internet as a collection of modems corresponding to each user 100 one-to-one when the plurality of users 100 simultaneously use the Internet. If one user 100 wants to use the PC of another user 100 as his PC, the bridge function allows the other user 100 to directly connect and use the PC without being connected through the Internet network. Performing a collective LAN modem 210, a plurality of output ports of the collective LAN modem 210 is connected to the Ethernet 220 so that each user 100 can use the Internet at the same time, two or more networks Dedicated to transmit the packet to the communication between the Ethernet 220 and the Internet by connecting the router, the router 230 to translate the address between the communication network or to match the protocol , E1, is composed of the data transfer device 240, such as T1.

In addition, when any one individual of the users 100 performs the bridge function through the above-described collective LAN modem 210, other congested users do not occur because the congestion phenomenon does not occur in the collective LAN modem 210. The 100 can use the Internet at a normal communication speed without being limited to this.

FIG. 6 is a detailed block diagram illustrating the configuration of the built-in LAN modem 112 of FIG. 5. When a data packet is input from a PC or the like, a tag is controlled according to the control of a microprocessor (not shown) of the PC. Temporarily stores each added data packet to transmit the stored data packet according to the control signal of the HDLC controller 310 to be described later, and stores the data packet input under the control of the HDLC controller 310. The main memory unit 300 outputs data under the control of the microprocessor of the PC, and the main memory unit when the data is uploaded by the direct memory access (DMA) method under the control of the microprocessor of the PC. The data packet of the parallel form stored in 300 is converted into the data packet of the serial form and output to the ICC unit 320, which will be described later. A high-level data link control (HDLC) controller 310 for converting the serial data packet input through the 320 into a parallel data packet and storing the data packet in the main memory unit 300 and the HDLC controller unit ( When the serial data packet is input through 310, the data packet is converted into a data format according to the 4-wire IOM-BUS protocol, and the 4-wire IOM-BUS through the IEC unit 330 described later. When data according to the agreement is input, the ICC (ISDN Communication Controller) unit 320 converts the serial data packet to the HDLC controller 310 and outputs the data through the ICC unit 320 or a filter to be described later. When data input through the unit 340 is transmitted to the filter unit 340 or the ICC unit 320 at high speed, a signal is diverted from the transmission line of the internal hybrid line to the reception line to prevent the pulse reception from being impossible. In the IEC (ISDN Echo Cancellation) unit 330 and the IEC unit 330 which predict the amount of the signal to be received from the original signal and generate a signal that denies this in advance, and removes the echo component from the superimposed signal of the echo signal. A filter unit 340 for uniformly filtering the level of the output data packet, performing impedance matching, a connector (RJ-11) 350 for connecting an internal LAN modem with an external communication line, and a microprocessor of a PC The secondary memory unit 360 temporarily used by the user, a hardware protection unit 370 for preventing copying by another person, and an external communication state of the internal LAN modem and a power state of the internal LAN modem. And a display unit 380 and a power supply unit 390 for supplying operating power to each of the above-described parts.

FIG. 7 is a block diagram showing the configuration of the external LAN modem 124 in detail. The communication of the Internet or the like is performed by an individual user or a user having a LAN environment such as SOHO. A first connector (RJ-45) 400 connected to the PC, a first filter unit 405 for uniformly filtering the level of data applied through the first connector 400 and performing impedance matching; Converts a bipolar data packet input through the first filter unit 405 into a unipolar data packet and interrupts each time a data packet is applied through the first filter unit 405. A memo to be described later by adding a tag to each data packet according to an interrupt signal generated when a data packet is input from the LAN transceiver controller unit 410 generating a signal and the LAN transceiver controller unit 410 during upload. Outputs a control signal to be stored in the unit 420, and outputs an ACK signal when the data is input from the HDLC controller unit 425, which will be described later, in downloading so that the data packet can be stored in the main memory unit 420. The data packet stored by the microprocessor unit 415 and the data packet output from the LAN transceiver controller unit 410 under the control of the microprocessor unit 415 and stored according to the control signal of the HDLC controller 425 which will be described later. The main memory unit 420 stores the data packet input under the control of the HDLC controller 425 and outputs the data packet to the LAN transceiver controller 410 under the control of the microprocessor unit 415. When data is uploaded by the DMA method under the control of the microprocessor unit 415, the parallel data packet stored in the main memory unit 420 is stored in the serial form. To convert the data packet to the ICC unit 430, which will be described later, and when downloading data, convert the serial data packet inputted through the ICC unit 430, which will be described later, into a parallel data packet, and then convert the data into a main memory unit. When the serial data packet is input through the HDLC controller 425 and the HDLC controller 425, the data packet is converted into a data format according to the 4-wire IOM-BUS protocol. When the data according to the 4-wire IOM-BUS protocol is input through the IEC unit 435 to be described later, the ICC unit 430 converts the serial data packet to the HDLC controller 425 and outputs the data to the HDLC controller 425. When the data input through the unit 430 or the data input through the second filter unit 440 to be described later is transmitted to the second filter unit 440 or the ICC unit 430 at high speed, an internal hybrid line transmission line To receiving line IEC part 435 which predicts the amount of the reflected signal from the original signal to prevent the pulse reception is impossible due to the signal bypass, and generates a signal that denies this in advance to remove the echo component from the superimposed signal of the echo signal. The second filter unit 440 constantly filters the level of the data packet output from the IEC unit 435, performs impedance matching, and a second connector (RJ-) connecting the internal LAN modem to an external communication line. 11) 445, an auxiliary memory unit 450 temporarily used by the microprocessor unit 415, an address latch unit 455 which temporarily stores an address used on the bus, and an external LAN modem. A flash memory unit 460 into which a program is input, a hardware protection unit 465 for preventing copying by another person, an external LAN modem, a PC such as an individual or a SOHO user, And a display unit 470 for displaying a connection state with an external communication line and a power state of an external LAN modem, and a power supply unit 475 for supplying operation power to the above-mentioned parts.

8 is a block diagram showing in detail the configuration of the collective LAN modem 210 installed on the Internet service provider side of FIG. 5 described above, compared with the configuration of the external LAN modem 124 of FIG. 7 described above. Two HDLC controllers 425, ICC unit 430, IEC unit 435, and filter unit 440 are respectively configured, and two lines of individual or group users are treated as one when individual or group users use the Internet. A plurality of LAN connectors (RJ-48) configured in proportion to the number of multiplexer modules 500 and the multiplexer modules 500 connected to the Ethernet 220 of the Internet service provider 200 of FIG. 510, a WAN connector (RJ-21) 520 for simultaneously connecting 16 lines of individual or group user lines when used in a WAN environment, the multiplexer module 500, the LAN connector 510, and A control module 530 for controlling the operation of the WAN connector 520, And a display unit 540 for indicating a connection state of the integrated LAN modem, and a power supply unit 550 for supplying power to each of the above-mentioned parts, and each of the above-described parts in a rack 560 of the Internet service provider side. Connected.

At this time, since the input port by individual or group user can be extended to 32, the multiplexer module 500 is configured with a maximum of 16. In this case, the LAN connector 510 is composed of 16 and the WAN connector 520 is composed of two. do.

Next, the operation of the high-speed subscriber data transmission system using the DSL LAN modem according to the present invention configured as described above will be described in detail.

First, when a group subscriber 120 such as a personal subscriber 110 or a SOHO equipped with a LAN environment attempts to access the Internet service provider 200 to use communication such as the Internet through a PC 111 or 121. To the integrated LAN modem 210 of the Internet service provider 200 via a telephone line or a dedicated line from an internal LAN modem 112 embedded in the PC 111 or an external LAN modem 124 connected to the PC 121. Connected.

In this case, when the plurality of users 100 simultaneously use the Internet, the above-described collective LAN modem 210 may correspond one-to-one to each user 100, and each multiplexer module 500 of the collective LAN modem 210 may have two. Lines can be processed.

Therefore, the multiplexer module 500 is composed of 16 when all the input ports that can be extended to 32 individuals or groups are used.

In addition, the most common form of Ethernet, which is a standard for connecting a LAN with a PC 121 equipped with a LAN environment, is called 10 Base-T, which achieves a maximum transmission speed of 10 Mbps when using a twisted-pair copper wire. .

In the present invention, since the LAN modem (embedded or external) in the present invention supports transmission of a 10 Base-T into a medium having a transmission capacity of about 4.5 km when connected to an Ethernet, the LAN modem (embedded or external) is used. The shortcomings in distance can be compensated for.

As such, when connected to the collective LAN modem 210 of the Internet service provider 200, the collective LAN modem 210 connects to the Ethernet 220 for allowing the corresponding user 100 to use the Internet.

Then, when the user 100 communicates by connecting two or more networks through the router 230 connected to the Ethernet 220, the packet is transmitted to the corresponding network, and the address is converted between the communication networks or the protocol. do.

In this way, the data output through the router 230 is transmitted to the site selected by the user 100 through the data transmission apparatus 240, so that the user 100 uses the Internet.

When a user accesses a desired site or receives a file containing some information in the site while using the Internet communication, the process is performed in reverse to the above description.

That is, when accessing a site or downloading a file, the data transmission device 240 → router 230 → Ethernet 220 → integrated LAN modem 210 → integrated or external LAN modem of the Internet service provider 200 ( 112) 124 → The data is transmitted in the order of the personal or group subscriber's PC (111) 121.

As such, when the user 100 uses the Internet, the data transmission speed is much faster than in the related art, and the Internet can be used without using a terminal server or the like as in the prior art, so that the Internet communication is very economical for the user. Will be available.

On the other hand, when the individual user of any one of the user 100 via the collective LAN modem 210 to perform a bridge function using a program in the other user's PC through his PC, the Internet network as in the prior art Connect another user's PC directly from Ethernet 220 without connecting through.

Accordingly, since the congestion phenomenon does not occur in the collective LAN modem 210, the other users 100 may use the Internet at a normal communication speed without being limited thereto.

When the bridge function is performed as described above, the user's PC as well as another user's PC are in the same screen state, but the communication speed of the user PC is lower than the communication speed supported by the LAN modem of the present invention.

As described above, according to the high-speed subscriber data transmission system using the DSL type LAN modem of the present invention, an individual or a plurality of users can always access like a dedicated line, and a network configuration without expensive terminal servers or routers is provided. This is possible, and it is possible to receive communication services such as the Internet for a monthly fee as well as to extend the LAN environment to the WAN.

It supports all LAN protocols such as TCP / IP and IPX, and provides various services such as telnet, FTP, e-mail, account service, Internet fax, etc., and it is easy to segment and manage LAN by installing bridge function. Since two-wire is used as the subscriber line, the efficiency of the line is increased.

Claims (6)

A local area network (LAN) modem is installed on a personal computer (PC), and a personal subscriber terminal connected to a telephone line when using the Internet, a plurality of PCs, printers, etc. are connected through Ethernet, and an external LAN modem is installed on the Ethernet. A user terminal comprising a terminal of a SOHO subscriber which establishes a LAN environment connected through a telephone line during use; And When a plurality of users using the user terminal use the Internet at the same time as a set of one-to-one corresponding modem for each user terminal to control the transmission and reception of data between each user terminal and the Internet, one user is different from his PC If you want to use a user's PC, a collective LAN modem that performs a bridge function to connect and use another user's PC directly without connecting through the Internet network, and a plurality of ports of the collective LAN modem are connected It is a router that transfers packets for communication between Ethernet and the Internet by connecting two or more networks with Ethernet for allowing each user terminal to access the Internet at the same time, and converts addresses between communication networks or protocols. And a data transmission line A high speed subscriber data transmission system using a DSL type LAN modem, characterized in that the Internet service providing device. A main memory unit for storing each data packet tagged with a tag and a data packet input through a communication line at the time of downloading when a data packet is input from a PC or the like; In case of uploading data by direct memory access (DMA) method under the control of the microprocessor of the PC, when converting the parallel data packet stored in the main memory into a serial data packet and downloading the data. An HDLC controller for converting an input serial data packet into a parallel data packet and storing the serial data packet in the main memory unit; An ICC unit converting the data packet into a data format according to the IOM-BUS protocol when the serial data packet is input through the HDLC controller and converting the data packet into a serial data packet when the data according to the IOM-BUS protocol is input; When the data input through the ICC unit or the data input at the time of downloading is transmitted at high speed, the amount of signal reflected back to prevent the pulse reception is impossible due to the bypass of the signal from the transmission line of the internal hybrid line to the receiving line. An IEC unit for generating a signal that predicts from the signal and negates it in advance to remove the echo component from the superimposed signal of the echo signal; A filter unit which constantly filters the level of the data packet output from the IEC unit and performs impedance matching; And A LAN modem comprising a connector for connecting an internal LAN modem with an external communication line. 3. The system of claim 2, wherein the built-in LAN modem; An auxiliary memory unit temporarily used by the microprocessor of the PC; A hardware protection unit for preventing copying by another person; And And a display unit for displaying an external communication state of the internal LAN modem. A first connector connected to a PC of an individual user or a LAN environment user when communication such as the Internet is performed by an individual user or a user having a LAN environment such as SOHO; A first filter unit which constantly filters the level of data applied through the first connector and performs impedance matching; A LAN transceiver controller for converting a bipolar data packet input through the first filter into a unipolar data packet and generating an interrupt signal whenever a data packet is applied through the first filter; A microprocessor unit which adds a tag to each data packet according to an interrupt signal generated when the data packet is input from the LAN transceiver controller unit during the upload, and outputs an ACK signal when the data is input when downloading; A main memory unit storing data packets output from the LAN transceiver controller unit under control of the microprocessor unit, storing data packets input through a communication line, and outputting the data packets to the LAN transceiver controller unit under control of the microprocessor unit; When data is uploaded in the DMA method under the control of the microprocessor unit, the parallel data packet stored in the main memory unit is converted into a serial data packet, and when the data is downloaded, the serial data packet is input. An HDLC controller for converting the data packet into a parallel data packet and storing the data packet in the main memory unit; When the serial data packet is input through the HDLC controller, the data packet is converted into the data format according to the IOM-BUS protocol. When the data according to the IOM-BUS protocol is input, the data packet is converted into the serial data packet and the HDLC controller is converted. An ICC unit outputting negatively; When the data input through the ICC unit or the data input at the time of downloading is transmitted at high speed, the amount of signal reflected back to prevent the pulse reception is impossible due to the bypass of the signal from the transmission line of the internal hybrid line to the receiving line. An IEC unit for predicting from the signal and generating a signal that denies it in advance to remove the echo component from the superimposed signal of the echo signal; A second filter unit which constantly filters the level of the data packet output from the IEC unit and performs impedance matching; And And a second connector for connecting the internal LAN modem to an external communication line. 5. The system of claim 4, wherein the external LAN modem; An auxiliary memory unit temporarily used by the microprocessor unit; An address latch unit for temporarily storing an address used on the bus; A flash memory unit into which a program used in an external LAN modem is input; A hardware protection unit for preventing copying by another person; And And a display unit for displaying the connection status between the external LAN modem and a personal communication or personal computer (SOHO) user and an external communication line, and the power status of the external LAN modem. A plurality of multiplexer modules for processing two lines of individual or group users into one when individual or group users use the Internet; A plurality of LAN connectors connected to the Ethernet of an Internet service provider and configured in proportion to the number of the multiplexer modules; A WAN connector for simultaneously connecting 16 lines of individual or group user lines when used in a WAN environment; A control module for controlling the operation of the multiplexer module, the LAN connector and the WAN connector; And A LAN modem comprising a display unit for displaying a connection status of a collective LAN modem.