KR100290655B1 - Asymmetric digital subscriber line system capable of providing symmetric/asymmetric type and transmission/reception link management method thereof - Google Patents

Abstract

The present invention relates to an asymmetric digital subscriber line system, and in particular, through the same asymmetric digital subscriber line system, a symmetrical / asymmetric service is available to provide subscribers with both symmetrical bidirectional high speed / low speed data services and asymmetric data services. An asymmetric digital subscriber line system and a transmission / reception link maintenance method thereof. According to the present invention, an asymmetric digital subscriber line system capable of symmetrical / asymmetric service and a transmission / reception link maintenance method thereof provide an asymmetric digital subscriber line system. By implementing the line system to enable symmetrical interactive data transmission / reception and asymmetrical data transmission / reception, it is possible to provide subscribers with asymmetrical services as well as symmetrical high-speed services such as interactive games, interactive video conferencing, services for telecommuters, and interactive broadband. There is an excellent effect that it can provide even a symmetrical two-way high-speed services such as tees media services.

Description

Asymmetric digital subscriber line system capable of symmetrical / asymmetrical service and its transmission / reception link maintenance method

The present invention relates to an asymmetric digital subscriber line system (hereinafter referred to as ADSL), and in particular, to a subscriber using a single copper line (symmetrical bidirectional high speed / low speed data service and asymmetry). The present invention relates to an asymmetric digital subscriber line system capable of providing symmetrical / asymmetrical services for providing all types of data services, and a method for maintaining a transmission / reception link thereof.

In the conventional asymmetric digital subscriber line system, as shown in FIG. 1, an ATM (Asychronous Transfer Mode; ATM) cell bus interface unit 11 and cell multiplexer 12 are shown. , A plurality of ADSL-C (ADSL-Central office end; hereinafter referred to as ADSL-C), a transmitter / receiver 13, a plurality of line drivers 14 and a central process unit; And an ADSL subscriber device 10 composed of 15; Line driver 21, ADSL-R (ADSL-R) (hereinafter referred to as ADSL-R) transmission / reception section 22, ATM processing section 23, ATM 25M transmission / reception section 24, It is provided with the ADSL Modem 20 which consists of the Ethernet transmission / reception part 25 and CPU26.

On the other hand, in the conventional asymmetric digital subscriber line system configured as described above, the down stream from the ADSL subscriber device 10 to the ADSL modem 20 is transmitted to the high-speed ADSL data, the ADSL modem 20 In the upstream to the ADSL subscriber device 10 provides only an asymmetric service in which low-speed ADSL data is transmitted.

In addition, HDSL (High Speed DSL), which provides two-way bandwidth, requires two copper wires, and the supported bandwidth cannot provide more than 1.5Mbps or 2Mbps, and SDSL (Single DSL) cannot use one copper wire. However, bandwidth cannot provide more than 1.5 Mbps or 2 Mbps, and the Very High Speed DSL (VDSL) offers 25 Mbps to 51 Mbps downwards and 1 Mbps upwards, but cannot be used at distances above 3000 feet.

Therefore, in the conventional asymmetric digital subscriber line system, HDSL system, SDSL system, and VDSL system, subscribers use a single copper wire for symmetrical high-speed services such as interactive games, interactive video conferencing, services for telecommuters, and interactive broadband multimedia services. There is a problem in that it cannot provide a long distance symmetric bidirectional high speed service.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a subscriber with both a symmetrical bidirectional high speed / low speed service and an asymmetric service using a single copper wire. To provide a service-enabled asymmetric digital subscriber line system and its transmission / reception link maintenance method.

In order to achieve the above object, the present invention provides an asymmetric digital subscriber line system capable of symmetrical / asymmetrical services, in an asymmetrical digital subscriber line system providing both symmetrical bidirectional data services and asymmetrical data services.

An ADSL subscriber device implemented to enable both a symmetrical bidirectional data transmission / reception operation and an asymmetrical data transmission / reception operation; And an ADSL modem implemented to enable both a symmetrical bidirectional data transmission / reception operation and an asymmetrical data transmission / reception operation with the ADSL subscriber device.

The present invention also provides a method for maintaining a transmission / reception link of an asymmetric digital subscriber line system capable of symmetric / asymmetric service, in which a symmetric bidirectional data service and an asymmetric data service are provided in an asymmetric digital subscriber line system.

The first CPU in the symmetrical / asymmetric ADSL subscriber device connects the link between its first ADSL-C transmitter / receiver and the second ADSL-R transmitter / receiver in the symmetrical / asymmetric ADSL modem. A first step of initializing to a low speed link; A second step of the first CPU transmitting an initialization control signal and initialization parameter information to a second CPU in the symmetric / asymmetric ADSL modem via an EOC channel in a transmission link of a first ADSL-C transmission / reception unit; After the second CPU in the symmetrical / asymmetric ADSL modem receives an initialization control signal and initialization parameter information, the second ADSL-C transmitting / receiving unit and the first ADSL-R transmitting / receiving unit in the symmetrical / asymmetric ADSL subscriber device A third step of initializing the link between the upstream for the high speed link and the downstream for the low speed link; A fourth step in which the first CPU receives link maintenance information periodically transmitted from its first ADSL-C transmitter / receiver, and maintains its own transmit / receive link; A fifth step of confirming whether a second ADSL-C transmitting / receiving unit in the symmetric / asymmetric ADSL modem has transmitted a maintenance transmission control signal from the first CPU; If the first CPU does not transmit the maintenance transmission control signal in the fifth step, the process returns to step 5; when the first CPU transmits the maintenance transmission control signal, the second ADSL-C transmitter / receiver A sixth step of transmitting information on a link in a symmetric / asymmetric ADSL modem to the first CPU through an EOC channel in its transmit link; The first CPU receives information about a link in a symmetric / asymmetric ADSL modem transmitted by the second ADSL-C transmitter / receiver, maintains a transmit / receive link in a symmetric / asymmetric ADSL modem, and then again performs a fifth Characterized in that the seventh step to proceed to the step.

1 is a functional block diagram showing the configuration of a conventional asymmetric digital subscriber line system;

2 is a functional block diagram illustrating a configuration of an asymmetric digital subscriber line system capable of symmetric / asymmetric service according to an embodiment of the present invention;

FIG. 3 is an operation flowchart illustrating a method of maintaining the transmit / receive link in an asymmetric digital subscriber line system capable of symmetric / asymmetric service according to FIG. 2.

<Explanation of symbols for main parts of the drawings>

100: symmetrical / asymmetric ADSL subscriber device

101: ATM cell bus interface unit 102: cell multiplexer

103: first ADSL-C transmitting / receiving unit 104: first ADSL-R transmitting / receiving unit

105: first line driver 106: second line driver

107: first CPU 200: symmetric / asymmetric ADSL modem

201: third line driver 202: fourth line driver

203: second ADSL-R transmission / reception unit 204: second ADSL-C transmission / reception unit

205: ATM processing unit 206: ATM 25M transmitting and receiving unit

207: Ethernet transmitting / receiving unit 208: second CPU

Hereinafter, an asymmetric digital subscriber line system capable of symmetrical / asymmetrical services and a transmission / reception link maintenance method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a functional block diagram of an asymmetric digital subscriber line system capable of symmetrical / asymmetric service according to an embodiment of the present invention, and an asymmetric digital subscriber line system capable of symmetrical / asymmetrical service according to an embodiment of the present invention It consists of a symmetrical / asymmetric ADSL subscriber device 100 and a symmetrical / asymmetric ADSL modem 200.

The symmetrical / asymmetric ADSL subscriber device 100 is mounted in a digital subscriber line-access multiplexer to enable both symmetrical bidirectional data transmission / reception and asymmetrical data transmission / reception with the symmetrical / asymmetric ADSL modem 200. A device implemented to include: an ATM cellbus interface unit 101, a cell multiplexer 102, a plurality of first ADSL-C transmit / receive units 103, a plurality of first ADSL-R transmit / receive units 104, a plurality And a plurality of first line drivers 105, a plurality of second line drivers 106, and a first CPU 107. As shown in FIG.

At this time, the ATM cell bus interface unit 101 mounted in the symmetrical / asymmetric ADSL subscriber device 100 receives an ATM cell signal output from an ATM cell bus and receives a cell header required for ATM cell switching. After performing a conversion operation and a cell routing operation based on a VPI / VCI (Virtual Path Identifier / Virtual Circuit Identifier) address, the ATM cell bus interface unit 101 outputs the cell multiplexer 102 to the cell multiplexer 102. It receives ATM-based cell signals output from the cell multiplexer 102 and transmits them to the ATM cell bus.

In addition, when the cell multiplexer 102 mounted in the symmetric / asymmetric ADSL subscriber device 100 receives an ATM cell signal output from the ATM cell bus interface unit 101, the cell multiplexer 102 multiplexes the first ADSL-C transmission after multiplexing. It outputs to the / receiver 103 and the first ADSL-R transmitter / receiver 104.

On the other hand, the cell multiplexer 102 demultiplexes the ATM cell signals output from the first ADSL-C transmitter / receiver 103 and the first ADSL-R transmitter / receiver 104, and demultiplexes the ATM cells. It serves to output to the bus interface unit 101.

In addition, when the first ADSL-C transmitting / receiving unit 103 mounted in the symmetric / asymmetric ADSL subscriber device 100 receives the high-speed ATM cell signal output from the cell multiplexer 102, the ADSL-C signal is received. After converting to a frame signal and outputs to the first line driver 105.

Meanwhile, when the first ADSL-C transmitter / receiver 103 receives a low-speed analog ADSL signal output from the first line driver 105, the first ADSL-C transmitter / receiver 103 converts the input signal into an ATM cell signal and then converts the cell multiplexer ( 102) outputs the role.

In addition, when the first ADSL-R transmitting / receiving unit 104 mounted in the symmetric / asymmetric ADSL subscriber device 100 receives the low-speed ATM cell signal output from the cell multiplexer 102, the ADSL-RS signal is received. After converting to a frame signal and outputs to the second line driver 106.

Meanwhile, when the first ADSL-R transmitter / receiver 104 receives a high-speed analog ADSL signal output from the second line driver 106, the first ADSL-R transmitter / receiver 104 converts the input signal into an ATM cell signal and then converts the cell multiplexer ( 102) outputs the role.

In addition, when the first line driver 105 mounted in the symmetrical / asymmetrical ADSL subscriber apparatus 100 receives a high-speed analog ADSL signal output from the first ADSL-C transmitter / receiver 103, the signal output is output. After raising the level, it outputs to the third line driver 201 in the ADSL modem 200 through a Plain Old Telephone Service (POTS) splitter.

Meanwhile, when the first line driver 105 receives the low-speed analog ADSL signal transmitted from the third line driver 201 in the ADSL modem 200 through the POTS splitter, the first ADSL-C transmitter / receiver ( 103).

In addition, when the second line driver 106 mounted in the symmetric / asymmetric ADSL subscriber device 100 receives the low-speed analog ADSL signal output from the first ADSL-R transmitter / receiver 104, the output of the signal is output. After raising the level, it outputs to the fourth line driver 202 in the ADSL modem 200 through a Plain Old Telephone Service (POTS) splitter.

On the other hand, when the second line driver 106 receives the high-speed analog ADSL signal transmitted from the fourth line driver 202 in the ADSL modem 200 through the POTS splitter, the first ADSL-R transmitter / receiver ( It outputs to 104).

The first CPU 107 transmits an initialization control signal and initialization parameter information through the EOC channel of the transmission link to perform system-wide control operations such as initialization and maintenance of a high speed / low speed link. 200 to the second CPU 208, while the second CPU 208 in the ADSL modem 200 receives the maintenance data of the high-speed / low-speed link transmitted over the link EOC channel, It performs a maintenance operation of the low speed link, and controls the overall operation of the other symmetrical / asymmetric ADSL subscriber device 100.

Meanwhile, the symmetrical / asymmetric ADSL modem 200 is a device implemented to enable both a symmetrical bidirectional data transmission / reception operation and an asymmetrical data transmission / reception operation with the symmetrical / asymmetric ADSL subscriber device 100, and a third line. Driver 201, fourth line driver 202, second ADSL-R transmitter / receiver 203, second ADSL-C transmitter / receiver 204, ATM processing unit 205, ATM 25M transmitter / receiver ( 206, an Ethernet transmitting / receiving unit 207, and a second CPU 208.

At this time, the third line driver 201 mounted in the symmetric / asymmetric ADSL modem 200 inputs a high-speed analog ADSL signal transmitted from the first line driver 105 in the ADSL subscriber apparatus 100 through the POTS splitter. When receiving, it serves to output to the second ADSL-R transmitting and receiving unit 203.

On the other hand, when the third line driver 201 receives a low-speed analog ADSL signal output from the second ADSL-R transmitting / receiving unit 203, the third line driver 201 raises the output level of the signal and then the POSL splitter through the POTS splitter. Output to the first line driver 105 in device 100.

In addition, the fourth line driver 202 mounted in the symmetrical / asymmetric ADSL modem 200 inputs a low-speed analog ADSL signal transmitted by the second line driver 106 in the ADSL subscriber apparatus 100 through a POTS splitter. When receiving, it serves to output to the second ADSL-C transmitter / receiver 204.

On the other hand, when the fourth line driver 202 receives a high-speed analog ADSL signal output from the second ADSL-C transmitter / receiver 204, the fourth line driver 202 raises the output level of the signal, and then, through the POTS splitter, the ADSL subscriber. Output to the second line driver 106 in device 100.

In addition, when the second ADSL-R transmitter / receiver 203 mounted in the symmetric / asymmetric ADSL modem 200 receives the high-speed analog ADSL signal output from the third line driver 201, the second ADSL-R transmitter / receiver 203 receives the input signal. After converting to an ATM cell signal and outputs to the ATM processing unit 205.

On the other hand, when the second ADSL-R transmitting / receiving unit 203 receives a low-speed digital ATM cell signal output from the ATM processing unit 205, the second ADSL-R transmitting / receiving unit 203 converts the input signal into a low-speed ADSL frame signal and then converts the third ADSL-R transmitting / receiving unit 203 into a third low-speed ADSL frame signal. Outputs to the line driver 201.

In addition, when the second ADSL-C transmitter / receiver 204 mounted in the symmetric / asymmetric ADSL modem 200 receives the low-speed analog ADSL signal output from the fourth line driver 202, the second ADSL-C transmitter / receiver 204 receives the low-speed analog ADSL signal. After converting to a low-speed ATM cell signal and outputs to the ATM processing unit 205.

On the other hand, when the second ADSL-C transmitting / receiving unit 204 receives the high-speed ATM cell signal output from the ATM processing unit 205, the second ADSL-C transmitting / receiving unit 204 converts the input signal into a high-speed ADSL frame signal and then the fourth line. It outputs to the driver 202.

In addition, the ATM processing unit 205 mounted in the symmetrical / asymmetric ADSL modem 200 may transmit a high speed digital ATM cell signal output from the second ADSL-R transmitting / receiving unit 203 and the second ADSL-C transmitting / receiving. When receiving the low-speed digital ATM cell signal output from the receiver 204, it divides into the ATM 24Mbps interface and the Ethernet interface and outputs the ATM 25M transmitter / receiver 206 and the Ethernet transmitter / receiver 207.

Meanwhile, when the ATM processing unit 205 outputs the high speed digital ATM cell signal from the ATM 25M transmitter / receiver 206 and the Ethernet transmitter / receiver 207, the ATM processor 205 receives the second ADSL-C transmitter / receiver ( At the same time, when outputting the low-speed digital ATM cell signal from the ATM 25M transmitter / receiver 206 and the Ethernet transmitter / receiver 207, it receives the input to the second ADSL-R transmitter / receiver 203. It plays a role of outputting.

In addition, the ATM 25M transmitter / receiver 206 mounted in the symmetrical / asymmetric ADSL modem 200 receives a digital ATM cell signal output from the ATM processing unit 205, codes it into an ATM 24Mbps transmission format, and then adds a subscriber. While outputting to the side service equipment, when receiving the signal output from the subscriber-side service equipment, it serves to decode and output to the ATM processing unit 205.

When the Ethernet transmitter / receiver 207 mounted in the symmetric / asymmetric ADSL modem 200 receives the digital ATM cell signal output from the ATM processing unit 205, it is coded into an Ethernet transmission format and then subscriber-side service. While outputting to the equipment, when receiving the signal output from the subscriber-side service equipment, it serves to decode and output to the ATM processing unit 205.

Meanwhile, the second CPU 208 mounted in the symmetrical / asymmetric ADSL modem 200 inputs an initialization control signal and initialization parameter information from the first CPU 107 mounted in the symmetrical / asymmetric ADSL subscriber device 100. Receive, initialize its own high speed / low speed link, and then output maintenance information for its high speed / low speed link to the first CPU 107, and control the overall symmetric / asymmetric ADSL modem 200. It plays a role.

Next, an operation process of an asymmetric digital subscriber line system capable of symmetric / asymmetric service according to an embodiment of the present invention having the above configuration will be described.

First, the operation of a symmetric bidirectional high speed service between the symmetrical / asymmetric ADSL subscriber device 100 and the symmetrical / asymmetric ADSL modem 200 will be described below with reference to FIG. 2.

First, the downstream process from the symmetrical / asymmetric ADSL subscriber apparatus 100 to the symmetrical / asymmetric ADSL modem 200 will be described. First, an ATM cell mounted in the symmetrical / asymmetric ADSL subscriber apparatus 100 will be described. The bus interface unit 101 receives a high-speed ATM cell signal output from an ATM cell bus, performs a cell header conversion operation required for ATM cell switching, and a cell routing operation based on a VPI / VCI address, and then executes the cell multiplexer 102. ) In this case, the high-speed ATM cell signal means high-frequency data having a transmission speed of 6Mbps or more, and the symmetrical bidirectional high-speed service refers to services such as interactive games, interactive video conferencing, telecommuting service, and interactive broadband multimedia service.

In addition, the cell multiplexer 102 receives the high-speed ATM cell signal output from the ATM cell bus interface unit 101, multiplexes it, and outputs the multiplexed signal to the first ADSL-C transmitter / receiver 103. Then, the first ADSL-C transmitter / receiver 103 receives the high-speed ATM cell signal output from the cell multiplexer 102 through the utopia interface, converts the ADSL frame signal into the first line driver 105. )

Meanwhile, the first line driver 105 receives a high speed analog ADSL signal output from the first ADSL-C transmitter / receiver 103, increases the output level of the signal, and then increases the output level of the ADSL modem through a POTS splitter. Output to the third line driver 201 in 200. Then, the third line driver 201 mounted in the symmetric / asymmetric ADSL modem 200 inputs the high speed analog ADSL signal transmitted by the first line driver 105 in the ADSL subscriber apparatus 100 through the POTS splitter. And the output to the second ADSL-R transmitter / receiver 203.

In addition, the second ADSL-R transmitter / receiver 203 receives a high-speed analog ADSL signal output from the third line driver 201, converts the input signal into a high-speed ATM cell signal, and then processes the ATM. Output to the unit 205. Then, the ATM processing unit 205 receives the high-speed digital ATM cell signal output from the second ADSL-R transmitting / receiving unit 203, divides it into an ATM 24Mbps interface and an Ethernet interface, and then sends the ATM 25M transmitting / receiving unit. 206 and the Ethernet transmitter / receiver 207 for output.

The ATM 25M transmitter / receiver 206 receives the high-speed digital ATM cell signal output from the ATM processor 205, codes it into an ATM 24Mbps transmission format, and outputs it to the subscriber side service equipment. The receiving unit 207 receives the high speed digital ATM cell signal output from the ATM processing unit 205, codes it in an Ethernet transmission format, and outputs it to the subscriber side service equipment.

Meanwhile, the upstream process from the symmetrical / asymmetric ADSL modem 200 to the symmetrical / asymmetric ADSL subscriber device 100 will be described. First, an ATM 25M transmission / reception installed in the symmetrical / asymmetric ADSL modem 200 will be described. The receiver 206 and the Ethernet transmitter / receiver 207 receive a high-speed ATM cell signal output from the subscriber service equipment, decode the signal, and output the decoded ATM signal to the ATM processor 205. Then, the ATM processing unit 205 receives the high speed digital ATM cell signals output from the ATM 25M transmitter / receiver 206 and the Ethernet transmitter / receiver 207, and transmits the second ADSL-C transmission through a utopia interface. / Output to the receiver 204.

In addition, the second ADSL-C transmitter / receiver 204 receives the high speed ATM cell signal output from the ATM processing 205, converts the input signal into a high speed ADSL program signal, and then supplies the fourth line. Output to driver 202. Then, the fourth line driver 202 receives the high-speed analog ADSL signal output from the second ADSL-C transmitter / receiver 204, increases the output level of the signal, and then increases the output level of the ADSL subscriber through a POTS splitter. Output to second line driver 106 in device 100.

On the other hand, the second line driver 106 mounted in the ADSL subscriber apparatus 100 receives a high-speed analog ADSL signal transmitted from the fourth line driver 202 in the ADSL modem 200 through a POTS splitter. Output to the 1st ADSL-R transmitter / receiver 104. Then, the first ADSL-R transmitter / receiver 104 receives the high-speed analog ADSL signal output from the second line driver 106, converts the input signal into a high-speed ATM cell signal, and then the cell multiplexer. Send to 102.

In addition, the cell multiplexer 102 receives a high-speed ATM cell signal output from the first ADSL-R transmitter / receiver 104, demultiplexes the signal, and outputs the demultiplexed signal to the ATM cell bus interface unit 101. Then, the ATM cell bus interface unit 101 receives an ATM-based low-speed cell signal output from the cell multiplexer 102 and transmits it to the ATM cell bus.

Meanwhile, the operation of the symmetric bidirectional low speed service between the symmetrical / asymmetric ADSL subscriber device 100 and the symmetrical / asymmetric ADSL modem 200 will be described below with reference to FIG. 2.

First, the downstream process from the symmetrical / asymmetric ADSL subscriber apparatus 100 to the symmetrical / asymmetric ADSL modem 200 will be described. First, an ATM cell mounted in the symmetrical / asymmetric ADSL subscriber apparatus 100 will be described. The bus interface unit 101 receives a low-speed ATM cell signal output from an ATM cell bus, performs a cell header conversion operation required for ATM cell switching, and a cell routing operation based on a VPI / VCI address, and then executes the cell multiplexer 102. ) In this case, the low-speed ATM cell signal means low frequency data having a transmission rate of about 640 Kbps.

In addition, the cell multiplexer 102 receives a low-speed ATM cell signal output from the ATM cell bus interface unit 101, multiplexes it, and outputs the multiplexed signal to the first ADSL-R transmitter / receiver 104. Then, the first ADSL-R transmitter / receiver 104 receives the low-speed ATM cell signal output from the cell multiplexer 102 through the utopia interface, converts the ADSL frame signal into the second line driver 106. )

Meanwhile, the second line driver 106 receives a low-speed analog ADSL signal output from the first ADSL-R transmitter / receiver 104, raises the output level of the signal, and then increases the output level of the ADSL modem through a POTS splitter. Output to the fourth line driver 202 in 200. Then, the fourth line driver 202 mounted in the symmetric / asymmetric ADSL modem 200 inputs the low-speed analog ADSL signal transmitted by the second line driver 106 in the ADSL subscriber device 100 through the POTS splitter. And the output to the second ADSL-C transmitter / receiver 204.

The second ADSL-C transmitter / receiver 204 receives a low-speed analog ADSL signal output from the fourth line driver 202, converts the input signal into a low-speed ATM cell signal, and then processes the ATM. Output to the unit 205. Then, the ATM processing unit 205 receives the low-speed digital ATM cell signal output from the second ADSL-C transmitting / receiving unit 204, divides it into an ATM 24Mbps interface and an Ethernet interface, and then sends the ATM 25M transmitting / receiving unit. 206 and the Ethernet transmitter / receiver 207 for output.

The ATM 25M transmitter / receiver 206 receives the low-speed digital ATM cell signal output from the ATM processor 205, codes it into an ATM 24Mbps transmission format, and outputs it to the subscriber side service equipment. The receiving unit 207 receives the low-speed digital ATM cell signal output from the ATM processing unit 205, codes it in an Ethernet transmission format, and outputs it to the subscriber side service equipment.

Meanwhile, the upstream process from the symmetrical / asymmetric ADSL modem 200 to the symmetrical / asymmetric ADSL subscriber device 100 will be described. First, an ATM 25M transmission / reception installed in the symmetrical / asymmetric ADSL modem 200 will be described. The receiver 206 and the Ethernet transmitter / receiver 207 receive the low-speed ATM cell signal output from the subscriber service equipment, decode it, and output the decoded ATM cell to the ATM processor 205. Then, the ATM processing unit 205 receives the low-speed digital ATM cell signals output from the ATM 25M transmitter / receiver 206 and the Ethernet transmitter / receiver 207, and transmits the second ADSL-R transmission through a utopia interface. / Output to the receiver 203.

In addition, the second ADSL-R transmitter / receiver 203 receives the low-speed ATM cell signal output from the ATM processing 205, converts the input signal into a low-speed ADSL program signal, and then transmits the third line. Output to the driver 201. Then, the third line driver 201 receives the low-speed analog ADSL signal output from the second ADSL-R transmitter / receiver 203, raises the output level of the signal, and then increases the output level of the ADSL subscriber through a POTS splitter. Output to first line driver 105 in device 100.

Meanwhile, the first line driver 105 mounted in the ADSL subscriber apparatus 100 receives a low-speed analog ADSL signal transmitted from the third line driver 201 in the ADSL modem 200 through a POTS splitter, and It outputs to the 1st ADSL-C transmitter / receiver 103. Then, the first ADSL-C transmitter / receiver 103 receives a low-speed analog ADSL signal output from the first line driver 105, converts the input signal into a low-speed ATM cell signal, and then converts the cell multiplexer. Send to 102.

In addition, the cell multiplexer 102 receives a low-speed ATM cell signal output from the first ADSL-C transmitter / receiver 103, demultiplexes the signal, and outputs the demultiplexed signal to the ATM cell bus interface unit 101. Then, the ATM cell bus interface unit 101 receives an ATM-based low-speed cell signal output from the cell multiplexer 102 and transmits it to the ATM cell bus.

On the other hand, the asymmetric service operation process between the symmetric / asymmetric ADSL subscriber device 100 and the symmetric / asymmetric ADSL modem 200 will be described.

First, the downstream from the symmetrical / asymmetric ADSL subscriber device 100 to the symmetrical / asymmetric ADSL modem 200 is a high speed service, and from the symmetrical / asymmetric ADSL modem 200 to the symmetrical / asymmetric ADSL subscriber device 100. In the operation of an asymmetric service in which the upstream provides a low speed service, the downstream data is transmitted through the high speed data link, and the upstream data is transmitted through the low speed data link.

Further, the downstream from the symmetrical / asymmetric ADSL modem 200 to the symmetrical / asymmetric ADSL subscriber device 100 is a high speed service and from the symmetrical / asymmetric ADSL subscriber device 100 to the symmetrical / asymmetric ADSL modem 200. In the operation of an asymmetric service in which the upstream provides a low speed service, the downstream data is transmitted through the low speed data link, and the upstream data is transmitted through the high speed data link.

Therefore, the detailed process of the asymmetric service operation can be understood by referring to the bidirectional symmetric service process described above, and thus will be omitted.

Meanwhile, a transmission / reception link maintenance method of an asymmetric digital subscriber line system capable of symmetric / asymmetric service according to an embodiment of the present invention will be described.

3 is an operation flowchart illustrating a method of maintaining a transmit / receive link of an asymmetric digital subscriber line system capable of symmetric / asymmetric service according to an embodiment of the present invention, where S represents a step.

First, the first CPU 107 in the symmetrical / asymmetric ADSL subscriber device 100 transmits its first ADSL-C transmitter / receiver 103 and the second ADSL-R transmission in the symmetrical / asymmetric ADSL modem 200. The initialization control signal is outputted to the first ADSL-C transmitting / receiving unit 103 so that the link between the receiving / receiving units 203 can be initialized to the high speed link downstream and the low speed link upstream. Then, the first ADSL-C transmitting / receiving unit 103 receives an initialization control signal output from the first CPU 107, sets its own transmission link to the high speed link, and sets the receiving link to the low speed link. (S1).

In addition, the first CPU 107 transmits an initialization control signal and initialization parameter information through the EOC channel in the transmission link of the first ADSL-C transmitter / receiver 103 to the second in the symmetrical / asymmetric ADSL modem 200. The CPU 208 transfers the data to the CPU 208 (S2).

Then, the second CPU 208 receives the initialization control signal and the initialization parameter information output from the first CPU 107, and then its symmetrical / asymmetrical with its second ADSL-C transmitter / receiver 204. To the second ADSL-C transmitter / receiver 204 to initialize the link between the first ADSL-R transmitter / receiver 104 in the ADSL subscriber apparatus 100 to the high speed link and the downstream link to the low speed link. Output an initialization control signal. Subsequently, the second ADSL-C transmitting / receiving unit 204 receives an initialization control signal output from the second CPU 208, sets its transmission link to a high speed link, and sets a receiving link to a low speed link. (S3).

The first CPU 107 receives link maintenance information periodically transmitted from its first ADSL-C transmitter / receiver 103, and periodically maintains its own transmit / receive link (S4). ).

On the other hand, the second ADSL-C transmitter / receiver 204 in the symmetrical / asymmetric ADSL modem 200 checks whether or not the maintenance transmission control signal is transmitted from the first CPU 107 (S5).

At this time, if the first CPU 107 does not transmit a maintenance transmission control signal to the second ADSL-C transmitting / receiving unit 204 in the fifth step S5 (NO), the second ADSL-C The transmitting / receiving unit 204 continuously checks whether or not the maintenance transmission control signal has been transmitted from the first CPU 107. However, if the first CPU 107 transmits a maintenance transmission control signal to the second ADSL-C transmitting / receiving unit 204 in the fifth step S5 (YES), the second ADSL-C transmission. The receiver 204 transmits information on the link in the symmetrical / asymmetric ADSL modem 200 to the first CPU 107 via the EOC channel in its transmission link (S6).

Then, the first CPU 107 receives information about a link in the symmetrical / asymmetric ADSL modem 200 transmitted from the second ADSL-C transmitter / receiver 204, and the symmetrical / asymmetric ADSL modem 200 Maintain a transmission / reception link in the network, and then proceed back to the fifth step S5 (S7).

As described above, according to the asymmetrical digital subscriber line system capable of symmetrical / asymmetrical services according to the present invention and its transmission / reception link maintenance method, the asymmetrical digital subscriberline system transmits and receives symmetrical bidirectional data transmission / reception and asymmetrical data transmission. / Receiving can be implemented to provide subscribers with not only asymmetric services but also symmetrical interactive high-speed services such as symmetrical high-speed services such as interactive games, interactive video conferencing, telecommuting services, and interactive broadband multimedia services. There is.

Claims (4)

In an asymmetric digital subscriber line system that provides both symmetric bidirectional data service and asymmetric data service, A symmetric / asymmetric ADSL subscriber device implemented to enable both symmetric bidirectional data transmission / reception and asymmetric data transmission / reception; Asymmetric digital subscriber line capable of symmetrical / asymmetrical service, characterized in that it comprises a symmetrical / asymmetrical ADSL modem implemented to enable both symmetrical bidirectional data transmission / reception and asymmetrical data transmission / reception with the ADSL subscriber device. system. The method of claim 1, The symmetric / asymmetric ADSL subscriber device receives an ATM cell signal from an ATM cell bus, and outputs after performing cell header conversion operation and cell routing operation based on VPI / VCI address required for ATM cell switching. Wow; A cell multiplexer for receiving and multiplexing an ATM cell signal at the ATM cell bus interface unit and outputting the multiplexed ATM cell signal and outputting the demultiplexed ATM cell signal to the ATM cell bus interface unit; The cell multiplexer receives a high speed ATM cell signal output through a utopia interface, converts and outputs an ADSL frame signal, and converts the low speed ADSL frame signal into an ATM cell signal after receiving a low ADSL frame signal, A plurality of first ADSL-C transmitters / receivers including an ATM transmission convergence function for transmitting to the cell multiplexer through an interface; The cell multiplexer receives a low-speed ATM cell signal output through a utopia interface, converts it into an ADSL frame signal, and outputs the same, while receiving a low-speed ADSL frame signal, converts the low-speed ADSL frame into an ATM cell signal, and then converts the Utopia interface. A plurality of first first ADSL-R transmitting / receiving units including an ATM transmission convergence function for transmitting to the cell multiplexer through the cell multiplexer; The first ADSL-C transmitter / receiver receives a high-speed analog ADSL signal, increases the output level of the signal, and outputs the low-speed analog ADSL signal transmitted by the ADSL modem through a POTS splitter. A plurality of first line drivers that are input through a POTS splitter and output to the first ADSL-C transmitter / receiver; The first ADSL-R transmitter / receiver receives a low-speed analog ADSL signal, increases the output level of the signal, outputs the ADSL modem through a POTS splitter, and transmits the high-speed analog ADSL signal transmitted from the ADSL modem. A plurality of second line drivers that are input through a POTS splitter and output to the first ADSL-R transmitter / receiver; An asymmetric digital subscriber line system capable of symmetric / asymmetric service, comprising a first CPU that performs overall system control operations such as initialization and maintenance of high-speed / low-speed links. The method of claim 1, The symmetric / asymmetric ADSL modem receives and outputs a high speed analog ADSL signal transmitted from a first line driver in the ADSL subscriber device through a POTS splitter, and receives a low speed analog ADSL signal, and outputs the output level of the signal. A third line driver for raising and outputting to a first line driver in the ADSL subscriber device through a POTS splitter; The low speed analog ADSL signal transmitted from the second line driver in the ADSL subscriber device is inputted through the POTS splitter and then outputted. When the high speed analog ADSL signal is received, the output level of the signal is increased. A fourth line driver for outputting to a second line driver in the ADSL subscriber apparatus; The third line driver receives the high speed analog ADSL signal, converts the input signal into an ATM cell signal, and outputs the same. When receiving the low speed ATM cell signal, the input signal is converted into an ADSL frame signal. A second ADSL-R transmitter / receiver including an ATM transmission convergence function output to the third line driver; The fourth line driver receives the low-speed analog ADSL signal, converts the input signal into an ATM cell signal, and outputs the same. When the high-speed digital ATM cell signal is received, the input signal is converted into an ADSL frame signal. A second ADSL-C transmitter / receiver including an ATM transmission convergence function which is output to the fourth line driver; The high speed digital ATM cell signal output from the second ADSL-R transmitter / receiver and the low speed digital ATM cell signal output from the second low speed ADSL-C transmitter / receiver are received and divided into an ATM 25M interface and an Ethernet interface. An ATM processing unit for outputting the high speed digital ATM cell signal to the second ADSL-C transmitting / receiving unit and outputting the low speed digital ATM cell signal to the second ADSL-R transmitting / receiving unit; Receives the digital ATM cell signal output from the ATM processing unit, codes it into ATM 24Mbps transmission format, outputs it to the subscriber side service equipment, and receives and decodes the signal output from the subscriber side service equipment to the ATM processing unit. An ATM 25M transmitting / receiving unit for outputting; Receives the digital ATM signal output from the ATM processing unit, encodes it to Ethernet transmission format and outputs it to the subscriber side service equipment, and receives and decodes the signal output from the subscriber side service equipment and outputs it to the ATM processing unit. An Ethernet transmit / receive unit; A second to receive initialization parameter information from a first CPU in the symmetrical / asymmetric ADSL subscriber device to initialize its own high speed / low speed link, and then output maintenance information on its high speed / low speed link to the first CPU An asymmetric digital subscriber line system capable of symmetrical / asymmetrical services, characterized in that the CPU is configured. In a method for providing both a symmetrical bidirectional data service and an asymmetric data service in an asymmetric digital subscriber line system, a high speed transmit / receive link and a low speed transmit / receive link maintenance method include: The first CPU in the symmetrical / asymmetric ADSL subscriber device connects the link between its first ADSL-C transmitter / receiver and the second ADSL-R transmitter / receiver in the symmetrical / asymmetric ADSL modem. A first step of initializing to a low speed link; A second step of the first CPU transmitting an initialization control signal and initialization parameter information to a second CPU in the symmetric / asymmetric ADSL modem via an EOC channel in a transmission link of a first ADSL-C transmission / reception unit; After the second CPU in the symmetrical / asymmetric ADSL modem receives an initialization control signal and initialization parameter information, the second ADSL-C transmitting / receiving unit and the first ADSL-R transmitting / receiving unit in the symmetrical / asymmetric ADSL subscriber device A third step of initializing the link between the upstream for the high speed link and the downstream for the low speed link; A fourth step in which the first CPU receives link maintenance information periodically transmitted from its first ADSL-C transmitter / receiver, and maintains its own transmit / receive link; A fifth step of confirming whether a second ADSL-C transmitting / receiving unit in the symmetric / asymmetric ADSL modem has transmitted a maintenance transmission control signal from the first CPU; If the first CPU does not transmit the maintenance transmission control signal in the fifth step, the process returns to step 5; when the first CPU transmits the maintenance transmission control signal, the second ADSL-C transmitter / receiver A sixth step of transmitting information on a link in a symmetric / asymmetric ADSL modem to the first CPU through an EOC channel in its transmit link; The first CPU receives information about a link in a symmetric / asymmetric ADSL modem transmitted by the second ADSL-C transmitter / receiver, maintains a transmit / receive link in a symmetric / asymmetric ADSL modem, and then again performs a fifth A transmission / reception link maintenance method of an asymmetric digital subscriber line system capable of symmetrical / asymmetric service, comprising the seventh step of advancing.