KR20020052023A - Remote dslam device - Google Patents

Abstract

PURPOSE: A remote DSLAM(Digital Subscriber Line Access Multiplexer) apparatus is provided to separate a CS(Concentration Shelf) and an MS(Modem Shelf) and then install the CS to an inside of a telephone station company and the MS to an apartment of an ADSL subscriber or an unmanned station of the subscriber's residential district. CONSTITUTION: A plurality of modem shelf DSLAMs(100) are installed to a remote unmanned station, when ADSL subscriber traffics are received from modems of a plurality of subscribers, converts the traffics into ATM cells and simultaneously multiplexes and collects and then transmits through an E1 line and also, when a plurality of ATM cells are received, converts the cells into ADSL subscriber's traffic and then distributes to the modems of the subscribers, respectively. A concentration shelf DSLAM(200) is installed to a telephone station and simultaneously connected to a plurality of modem shelf DSLAMs installed to a remote district through a plurality of E1 lines, and when a large volume of ATM cells are received from a plurality of modem shelf DSLAMs(100) or modems of a plurality of subscribers, collects the cells by STM-1 level and then transmits to an ATM exchange and also, when ATM cells are received from the ATM exchange, distributes the cells to the plurality of modem shelf DSLAMs(100) or the modems of the subscribers.

Description

Remote DSLAM device {REMOTE DSLAM DEVICE}

The present invention relates to a remote Digital Subscriber Line Access Multiplexer (DSLAM) device, and more particularly, to separate and concentrate a concentration shelf (CS) and a modem shelf (MS). Self-install is installed in a telephone company, while modem self-provides a remote DSL device designed to be installed in a subscriber's apartment or unmanned national office in a subscriber's residential area.

As is well known, in the current trend of increasing demand for ADSL, the need for ADSL service support in more areas and farther away from the telephone company is increasing.

The conventional DSLAM system is installed in a telephone company as a rack type structure as shown in FIG. 1, and the self-control and management function of the Concentration Shelf (CS) 10 is performed by looking at the self-specific configuration. Concentration Shelf Management Board (CSMB) (11), Concentration Self-Providing Synchronous Transfer Mode Level 1 (STM-1) interface with Asynchronous Transfer Mode (ATM) network. Concentration Shelf Downlink Board (CSDB) providing an E1 or STM-1 interface with a Concentration Shelf Uplink Board (CSUB) (12) and a Modem Shelf (MS) 20 A centralized self 10 comprising a Digital Subscriber Line Board (DSLB) 14 in ADSL subscriber interface mode; Modem Shelf Management Board (MSMB) 21, which performs control and management functions of the modem Self 20, and a Modem Self Interface Board (MSIB) that provides an E1 or STM-1 interface with a centralized self. A modem self (20) consisting of a Shelf Interface Board (22) and a Digital Subscriber Line Board (DSLB) 23, which is an ADSL subscriber interface board; And a Splitter Pots Line Board (SPLB) (31) that provides separation and synthesis of subscriber ADSL data and POTS voice signals, and PADP (Power & Power) that supplies each board's required power with a -48V power supply. Alarm Distribution Panel (hereinafter referred to as " PADP ") < RTI ID = 0.0 > 32 < / RTI >

Hereinafter, referring to FIG. 2, the operation process according to the aggregation structure of the conventional DSLAM system described above will be described. Each modem self 10 receives ADSL subscriber traffic from the ADSL subscriber modem 1 and then E1, DS3 or STM. Multiplex and aggregate to -1 level ATM traffic and transmit / receive to centralized self. Then, the concentrated self 20 aggregates the ATM traffic received from each modem self 10 to E1, DS3 or STM-1 level and transmits / receives with ATM switch 2.

However, the above-described conventional DSLAM system has the advantage of being easy to expand as the capacity of the subscriber increases. However, in a situation where the demand of ADSL subscribers increases rapidly, the distance between the subscribers and the remote residential areas such as rural areas is long. There was a problem in that the subscriber could not support the service if the service was out of the maximum distance of the ADSL line.

Accordingly, the present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a remote DSL device that is advantageous for providing ADSL service in a remote area or a low population density area from the telephone company. .

In order to achieve the above object, the remote DSL device of the present invention is installed in a remote unmanned company, and receives ADSL subscriber traffic from a plurality of ADSL subscriber modems, converts it to an ATM cell, and simultaneously multiplexes and aggregates the same through an E1 line. A plurality of modem self DSLAMs, each transmitting and receiving a plurality of ATM cells and converting the same into ADSL subscriber traffic and distributing them to a plurality of ADSL subscriber modems; And

STM is installed at the telephone company and connected to the plurality of modem self DSLAMs installed remotely from the telephone company, respectively, using a plurality of E1 lines, and receiving a large number of ATM cells from the plurality of modem self DSLAMs or ADSL subscriber modems. After converging to the -1 level and transmitting to the ATM switch, when receiving an ATM cell from the ATM switch, it is configured as a centralized self DSLAM for distributing it to a corresponding modem self DSLAM or a plurality of ADSL subscriber modems.

1 is a shape diagram showing a state of a conventional DSLAM device of the rack-type structure,

2 is a diagram illustrating a network configuration of a conventional DSLAM device having a rack-type structure according to FIG. 1;

3 is a basic network configuration to which a remote DSLAM device is applied according to an embodiment of the present invention;

4 is a functional block diagram showing the configuration of a remote DSLAM device according to an embodiment of the present invention;

5 is a rack structure diagram of a modem self DSLAM in a remote DSLAM device according to FIG. 4;

FIG. 6 is a rack structure diagram of a concentrated self DSLAM in a remote DSLAM device according to FIG. 4;

7 is a functional block diagram showing a configuration of a first IMA interface board in a modem self DSLAM in the remote DSLAM device according to FIG. 4;

FIG. 8 is a functional block diagram showing the configuration of a second IMA interface board in the centralized self DSLAM in the remote DSLAM device according to FIG. 4; FIG.

9 is a view showing the structure of an IMA frame in the remote DSLAM device according to FIG. 4;

FIG. 10 is a view illustrating an E1 link connection state between a first IMA interface board in a DSLAM and a first and second IMA interface board in a second self-contained DSLMA in a remote DSLAM device according to FIG. 4;

FIG. 11 is a diagram illustrating an IMA frame transmission form between a first IMA interface board in a modem self DSLAM and a first and second IMA interface board in a centralized self DSLMA in the remote DSLAM device of FIG. 4.

<Explanation of symbols for the main parts of the drawings>

100: modem self DSLAM 110: first digital subscriber line board

120: first IMA interface board 121: first line interface unit

122: first subscriber network interface unit 123: first IMA unit

124: first cell multiplexer 125: first cell bus interface unit

126: 1st CPU 130: Modem Self Management Board

200: self-contained DSLAM 210: second digital subscriber line board

220: second IMA interface board 221: second line interface unit

222: second subscriber network interface unit 223: second IMA unit

224: second cell multiplexer 225: second cell bus interface unit

226: second CPU 230: centralized self uplink board

240: intensive self management board

Hereinafter, a remote DSL device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Remote DSLAM device according to an embodiment of the present invention, as shown in Figure 3, is installed in a remote unmanned company and at the same time a plurality of modem self DSLAM (100) having a self-structure as shown in Figure 5, and the telephone company At the same time, it consists of a concentrated self DSLAM (200) having a self-structure as shown in FIG.

When the plurality of modem self DSLAMs (100) receive ADSL subscriber traffic from the plurality of ADSL subscriber modems (1), they convert them into ATM cells, and simultaneously multiplex and aggregate them to the centralized self DSLAMs 200 through the E1 line. On the other hand, when receiving a plurality of ATM cells from the centralized self DSLAM 200 converts them into ADSL subscriber traffic and distributes them to the plurality of ADSL subscriber modems 1, respectively, as shown in FIG. First Digital Subscriber Line Board (DSLB) 110, a first Inverse Multiplexing for ATM (IMA) interface board 120, and a Modem Self Management Board (MSMB). Modem Shelf Management Board) 130, respectively.

At this time, the plurality of first digital subscriber line boards 110 respectively installed in the plurality of modem self DSLAMs 100 receives ADSL subscriber traffic from the plurality of ADSL subscriber modems 1 and converts them into ATM cells, respectively. While transmitting to the first IMA interface board 120, when receiving a plurality of ATM cells from the first IMA interface board 120, respectively converts them into ADSL subscriber traffic and transmits them to the corresponding ADSL subscriber modem (1). do.

On the other hand, the first IMA interface board 120 mounted on each of the plurality of modem self DSLAMs 100 is connected to the plurality of first digital subscriber line boards 110 by a cell bus and thus the plurality of first digital subscribers. When a large amount of ATM cells are received from the line board 110, the plurality of ATM cells are converted into IMA frames and then transmitted to the intensive self DSLAM 200 through a plurality of E1, while receiving an IMA frame from the intensive self DSLAM 200. After extracting an ATM cell from the IMA frame and distributing it to the plurality of first digital subscriber line boards 110, a plurality of first line interface units (LIUs) as shown in FIG. 121, a plurality of first user network interface (UNI) 122, a first IMA unit 123, a first cell multiplexer 124, a first cell bus interface Interface) (1 25) and a first CPU (Central Process Unit) 126.

When the plurality of first line interface units 121 mounted in the first IMA interface board 120 receive IMA frames from the intensive self DSLAM 200 through the plurality of E1 lines, respectively, the impedance and the alarm are checked. While transmitting to the first subscriber network interface unit 122 connected with itself, and receiving the IMA frame from the corresponding first subscriber network interface unit 122 to transmit it to the centralized self DSLAM (200) through the E1 line, respectively Play a role.

In addition, the plurality of first subscriber network interface units 122 mounted in the first IMA interface board 120 are connected one-to-one with the plurality of first line interface units 121, and the first line interface unit 121 is connected. Receiving an IMA frame from each of the IMA frame, extracts an ATM cell from the IMA frame, performs head error check / correction, cell filtering, etc. to transmit to the first IMA unit 123, while the first IMA unit 123 When receiving a plurality of ATM cells from each other to convert it into an IMA frame and transmits to the first line interface unit 121.

Meanwhile, when the first IMA unit 123 mounted in the first IMA interface board 120 receives a plurality of ATM cells from the plurality of first subscriber network interface units 122, the first IMA unit 123 receives a plurality of ATM cells and processes the same at the same time. After inserting destination information into a cell, the destination cell is transmitted to the first cell multiplexer 124, and when a plurality of ATM cells are received from the first cell multiplexer 124, the plurality of first subscriber network interface units are demuxed. It distributes to 122 and transmits.

In addition, when the first cell multiplexer 124 mounted in the first IMA interface board 120 receives a plurality of ATM cells from the first IMA unit 123, cell loss due to a bottleneck of cell transmission rate is eliminated. After performing the buffering function to transmit the cell to the first cell bus interface 125, and receiving a plurality of ATM cells from the first cell bus interface 125, cell loss due to a bottleneck of cell transmission rate After performing the buffering function to remove the role to transmit to the IMA unit 123.

Meanwhile, when the first cell bus interface unit 125 mounted in the first IMA interface board 120 receives a plurality of ATM cells from the first cell multiplexer 124, the first cell bus interface unit 125 receives the plurality of ATM cells through the cell bus. While transmitting to the line board 110, when receiving a plurality of ATM cells from the plurality of first digital subscriber line boards 110, it transmits them to the first cell multiplexer 124.

In addition, the first CPU 126 mounted in the first IMA interface board 120 may include the plurality of first line interface units 121, a plurality of first subscriber network interface units 122, and a first IMA unit ( 123, the first cell multiplexer 124, and the first cell bus interface unit 125 perform various control functions.

At this time, when transmitting the IMA frame to the intensive self DSLAM 200, the first IMA interface board 120 bundles a plurality of E1s in an arbitrary group and transmits them by round robin. The first subscriber network interface unit 122 and the first IMA unit 123, the first IMA unit 123, and the first cell multiplexer 124 mounted in the first IMA interface board 120. ) Is connected in a utopia level 2 scheme, while the first cell multiplexer 124 and the first cell bus interface unit 125 are connected in a utopia level 1 scheme.

In addition, the modem self management board 130 mounted in each of the plurality of modem self DSLAMs 100 may operate and manage functions of the plurality of first digital subscriber line boards 110 and the first IMA interface board 120. It plays a role.

On the other hand, the concentrated self DSLAM (200) is installed in the telephone company and at the same time connected to the plurality of modem self DSLAM (100) remotely installed from the telephone company by a plurality of E1 lines, the plurality of modem self DSLAM (10) Alternatively, when a large number of ATM cells are received from a plurality of ADSL subscriber modems 1, they are collected at the STM-1 level and transmitted to the ATM switch 2, and when the ATM cells are received from the ATM switch 2, the corresponding ATM cells are received. It serves to distribute to the modem self DSLAM 100 or a plurality of ADSL subscriber modems 1, and as shown in FIG. 4, a plurality of second Digital Subscriber Line Boards (DSLBs) 210, 2 is composed of an IMA interface board 220, a Concentration Shelf Uplink Board (CSUB) 230, and a Concentration Shelf Management Board (CSMB) 240.

At this time, when the plurality of second digital subscriber line boards 210 mounted in the concentrated self DSLAM 200 receive ADSL subscriber traffic from a plurality of ADSL subscriber modems 1, each of the plurality of digital subscriber line boards 210 converts the ADSL subscriber traffic into an ATM cell. While transmitting to the link board 230, when receiving a plurality of ATM cells from the centralized self-uplink board 230, it converts them into ADSL subscriber traffic and transmits them to the corresponding ADSL subscriber modem (1).

In addition, the second IMA interface board 220 mounted in the intensive self DSLAM 200 is connected one-to-one with the plurality of modem self DSLAMs 100 through an E1 line, thereby receiving an IMA frame from the corresponding modem self DSLAM 100. When received, the ATM cell is extracted from the IMA frame and transmitted to the lumped self uplink board 230, while receiving a plurality of ATM cells from the lumped self uplink board 230, E1 is converted into an IMA frame, and then E1. It transmits to the corresponding modem self DSLAM 100 through a line, and as shown in FIG. 8, a plurality of second line interface units 221, a plurality of second subscriber network interface units 222, and a second IMA. The unit 223, the second cell multiplexer 224, the second cell bus interface unit 225, and the second CPU 226 are configured.

In this case, the plurality of second line interface units 221 mounted in the second IMA interface board 220 receive impedance and alarm when each of the IMA frames is received from the modem self DSLAM 100 through the plurality of E1 lines. After checking, it transmits to the second subscriber network interface unit 222 connected with itself, and receives the IMA frame from the corresponding second subscriber network interface unit 222, respectively, through the E1 line and the modem self DSLAM (100). ) Is used to send.

In addition, the plurality of second subscriber network interface units 222 mounted in the second IMA interface board 220 are connected one-to-one with the plurality of second line interface units 221, and the corresponding second line interface unit 221 is provided. Receiving an IMA frame from each of the IMA frames, extracts an ATM cell from the IMA frame, performs head error check / correction, cell filtering, etc., and transmits it to the second IMA unit 223, while the second IMA unit 223 Receiving a plurality of ATM cells from each other, it converts them into IMA frames and transmits them to the corresponding second line interface unit 221.

Meanwhile, when the second IMA unit 223 mounted in the second IMA interface board 220 receives a plurality of ATM cells from the plurality of second subscriber network interface units 222, the second IMA unit 223 muxes them and simultaneously handles them. After inserting destination information into a cell, the second cell multiplexer 224 transmits the received cell information to the second cell multiplexer 224, and when receiving a plurality of ATM cells from the second cell multiplexer 224, demuxes the plurality of second subscriber network interface units. It distributes to 222 and transmits.

In addition, when the second cell multiplexer 224 mounted in the second IMA interface board 220 receives a plurality of ATM cells from the second IMA unit 223, cell loss due to a bottleneck of cell transmission rate is eliminated. After performing the buffering function to transmit the cell to the second cell bus interface unit 225, and receiving a plurality of ATM cells from the second cell bus interface unit 225, cell loss due to a bottleneck of the cell transmission rate. After performing the buffering function to eliminate the role to transmit to the second IMA unit 223.

Meanwhile, when the second cell bus interface unit 225 mounted in the second IMA interface board 220 receives a plurality of ATM cells from the second cell multiplexer 224, the second cell bus interface unit 225 receives the plurality of ATM cells through the cell bus. While transmitting to the board 230, when receiving a plurality of ATM cells from the lumped self uplink board 230, it transmits them to the second cell multiplexer 224.

In addition, the second CPU 226 mounted in the second IMA interface board 220 may include the plurality of second line interface units 221, a plurality of second subscriber network interface units 222, and a second IMA unit ( 223, the second cell multiplexer 224, and the second cell bus interface unit 225 perform various control functions.

At this time, when transmitting the IMA frame to the modem self DSLAM 100, the second IMA interface board 220 bundles a plurality of E1s in an arbitrary group and transmits them by round robin. The second subscriber network interface unit 222 and the second IMA unit 223, the second IMA unit 223, and the second cell multiplexer 224 mounted in the second IMA interface board 220. ) Is connected in a utopia level 2 scheme, while the second cell multiplexer 224 and the second cell bus interface unit 225 are connected in a utopia level 1 scheme.

Meanwhile, the centralized self uplink board 230 mounted in the centralized self DSLAM 200 is connected to the plurality of second digital subscriber line boards 210 and the second IMA interface board 220 through a cell bus. ATM cells are collected from the plurality of second digital subscriber line boards 210 or the second IMA interface board 220 and then transferred to the ATM switch 2 while the plurality of ATM cells are transferred from the ATM switch 2. When received, it distributes the data to the plurality of second digital subscriber line boards 210 or the second IMA interface board 220 and transmits them.

In addition, the centralized self management board 240 mounted in the centralized self DSLAM 200 includes the plurality of second digital subscriber line boards 210, the second IMA interface board 220, and the centralized self uplink board 230. It is responsible for the operation and management functions of.

On the other hand, the IMA frame (10a) described above, as shown in Figure 9, the plurality of ATM cells (11a) stored data, such as voice, image, text, etc., the plurality of fillers (null data) stored ( Filler) 12a, and ICP (IMA Control Protocol) (hereinafter referred to as " ICP ") storing header information such as E1 location information and error check information of the ATM cell 11a and the filler cell 12a, etc. 13a It consists of).

Next, an operation process of the remote DSSL device according to an embodiment of the present invention having the above configuration will be described with reference to the accompanying drawings.

First, a description will be given of the ATM cell transfer process from the plurality of modem self DSLAM (100) to the centralized self DSLAM (200).

Initially, the plurality of first digital subscriber line boards 110 mounted in the modem self DSLAM 100 receives ADSL subscriber traffic from a plurality of ADSL subscriber modems 1 and converts them into ATM cells to convert the first IMA interface board. Send to 120.

Then, the first IMA interface board 120 receives a plurality of ATM cells from the plurality of first digital subscriber line boards 110 and simultaneously converts them into IMA frames, and then through the plurality of E1, FIG. 10, FIG. By using the round robin method as shown in 11 to transmit to the concentrated self DSLAM (200). In this case, the detailed process of transmitting the IMA frame by the first IMA interface board 120 to the second IMA interface board 220 in the concentrated self DSLAM 200 will be described in detail. The interface unit 125 receives a plurality of ATM cells from the plurality of first digital subscriber line boards 110 and transmits the plurality of ATM cells to the first cell multiplexer 124. Then, the first cell multiplexer 124 receives a plurality of ATM cells from the first cell bus interface 125 and performs a buffering function to eliminate cell loss due to a bottleneck of cell transmission rate. Subsequently, the IMA unit 123 receives a plurality of ATM cells from the first cell multiplexer 124, demuxes them, distributes them to the plurality of first subscriber network interface units 122, and transmits them. Then, after receiving the plurality of ATM cells from the first IMA unit 123, the plurality of first subscriber network interface units 122 converts the ATM cells into IMA frames and then converts the corresponding first line interface unit 121 into the corresponding first line interface unit 121. To each. Subsequently, the plurality of first line interface units 121 receive IMA frames from the corresponding first subscriber network interface unit 122 and then transmit them to the centralized self DSLAM 200 through a robin round scheme. Here, the round robin method means a method of sequentially transmitting through four E1 when eight E1s are grouped into four groups as shown in FIG. 10. In other words, when the first IMA interface board 120 transmits an IMA frame to the second IMA interface board 220 in the intensive self DSLAM 200, the " E1 link # 0 → E1 link # 1 → E1 link # 2 → E1 link # 3 → E1 link # 0 → E1 link # 1 ”, and the round robin method can freely group E1 according to an operator's selection.

Meanwhile, the second IMA interface board 220 mounted in the concentrated self DSLAM 200 receives an IMA frame from the modem self DSLAM 100 and extracts an ATM cell from the IMA frame to extract the ATM cell. Transmit to 230. In this case, the second IMA interface board 220 will be described in detail with respect to the detailed process for transmitting the ATM cell to the lumped self uplink board 230, first, the plurality of second line interface unit 221 After receiving the IMA frames from the modem self DSLAM 100 through a plurality of E1 lines, it checks the impedance and the alarm and transmits them to the second subscriber network interface unit 222 connected to each other. Then, the plurality of second subscriber network interface unit 222 receives an IMA frame from each of the second line interface unit 221 connected thereto, extracts an ATM cell from the IMA frame, and simultaneously checks for head error / Modification, cell filtering, and the like are transmitted to the second IMA unit 223. Subsequently, the second IMA unit 223 receives a plurality of ATM cells from the plurality of second subscriber network interface units 222, muxes them, and inserts destination information into the ATM cells to insert the destination information. Transmit to cell multiplexer 224. Then, the second cell multiplexer 224 temporarily stores the plurality of ATM cells after receiving the plurality of ATM cells from the second IMA unit 223. Subsequently, the second cell bus interface unit 225 receives a plurality of ATM cells from the second cell multiplexer 224 and transmits the plurality of ATM cells to the centralized self uplink board 230 through the cell bus.

Then, the lumped self uplink board 230 collects ATM cells from the second IMA interface board 220 and transmits them to the ATM switch 2.

Meanwhile, the following describes the ATM cell transmission process from the intensive self DSLAM 200 to the plurality of modem self DSLAM 100.

First, the centralized self uplink board 230 mounted in the centralized self DSLAM 200 receives a plurality of ATM cells from the ATM switch 2 and transmits the plurality of ATM cells to the second IMA interface board 220.

Then, the second IMA interface board 220 receives a plurality of ATM cells from the lumped self uplink board 230 and converts them into IMA frames, and at the same time through the plurality of E1 shown in FIGS. 10 and 11. By using the round robin method as described above it transmits to the corresponding modem Self DSLAM (100). In this case, the second IMA interface board 220 will be described in more detail with respect to the detailed process of transmitting the IMA frame to the first IMA interface board 120 in the modem Self DSLAM (100), first, the second cell bus The interface unit 225 receives a plurality of ATM cells from the lumped self uplink board 230 and transmits the plurality of ATM cells to the second cell multiplexer 224. Then, the second cell multiplexer 224 temporarily receives the plurality of ATM cells from the second IMA unit 223 and temporarily stores the cell loss due to the bottleneck of the cell transmission rate. Subsequently, the second IMA unit 223 receives a plurality of ATM cells from the second cell multiplexer 224, demuxes them, distributes them to the plurality of second subscriber network interface units 222, and transmits them. Then, the plurality of second subscriber network interface unit 222 receives each of a plurality of ATM cells from the second IMA unit 223 and converts them into IMA frames, and at the same time, the corresponding second line interface unit 221. To send. Subsequently, the plurality of second line interface units 221 receive an IMA frame from the corresponding second subscriber network interface unit 222 and then, respectively, in a round robin manner as shown in FIGS. 10 and 11. Transmit to modem self DSLAM (100).

Then, the first IMA interface board 120 in the plurality of modem self DSLAMs 100 receives an IMA frame from the centralized self DSLAM 200, and simultaneously extracts an ATM cell from the IMA frames. The first digital subscriber line board 110 is distributed and transmitted. In this case, the first IMA interface board 120 will be described in detail with respect to the detailed process of transmitting an ATM cell to the plurality of first digital subscriber line board 110, first, the plurality of first line interface unit ( 121 receives the IMA frames through the plurality of E1 lines from the intensive self DSLAM 200 and checks the impedance and the alarm and transmits them to the first subscriber network interface 122 connected to the same. Then, the plurality of first subscriber network interface units 122 respectively receive IMA frames from the first line interface unit 121 connected therewith, extract ATM cells from the IMA frames, and simultaneously check head error. Perform modification / cell filtering, etc. and transmit the same to the first IMA unit 123. Subsequently, the first IMA unit 123 receives a plurality of ATM cells from the plurality of first subscriber network interface units 122, muxes them, and inserts destination information into the ATM cells at the same time. Transmit to cell multiplexer 124. Then, after receiving the plurality of ATM cells from the first IMA unit 123, the first cell multiplexer 124 temporarily stores the cell cell due to the bottleneck of the cell transmission rate. Subsequently, the first cell bus interface unit 125 receives a plurality of ATM cells from the first cell multiplexer 124 and transmits the plurality of ATM cells to the corresponding first digital subscriber line board 110 through the cell bus.

Then, the plurality of first digital subscriber line boards 110 receives a plurality of ATM cells from the first IMA interface board 120 and then converts them into ADSL subscriber traffic and transmits them to the corresponding ADSL subscriber modem 1. do.

As described above, according to the remote DSLAM apparatus according to the present invention, it is possible to provide an ADSL service for a long-distance subscriber such as a rural area and a subscriber with a long distance from the telephone company in a situation where the demand of the ADSL subscriber increases rapidly. In addition, it has the effect of enabling a wider ADSL service network to be built.

Claims (11)

Installed in a remote unmanned company, ADSL subscriber traffic from multiple ADSL subscriber modems is converted to ATM cells, multiplexed and converged, and then transmitted over E1 lines, respectively, while ADSL subscribers receive multiple ATM cells. A plurality of modem self DSLAMs that convert traffic into a plurality of ADSL subscriber modems, respectively; And STM is installed at the telephone company and connected to the plurality of modem self DSLAMs installed remotely from the telephone company by a plurality of E1 lines, respectively, when receiving a large number of ATM cells from the plurality of modem self DSLAMs or a plurality of ADSL subscriber modems. And a centralized DSLAM configured to transmit to the ATM switch after receiving the ATM cell from the ATM switch and distributing it to the corresponding modem self DSLAM or a plurality of ADSL subscriber modems. The method of claim 1, The plurality of modem self DSLAMs convert ADSL subscriber traffic from a plurality of ADSL subscriber modems into ATM cells, and transmit the converted ADSL subscriber traffic to a corresponding ADSL subscriber modem. A plurality of first digital subscriber line boards for transmitting; Connected to the plurality of first digital subscriber line boards via a cell bus, and when receiving a large number of ATM cells from the plurality of first digital subscriber line boards, converts them into IMA frames and sends them to the centralized self DSLAM through a plurality of E1s. A first IMA interface board that transmits and extracts an ATM cell from the IMA frame and distributes it to the plurality of first digital subscriber line boards when the IMA frame is received from the centralized self DSLAM; And And a modem self management board configured to perform operations and management functions of the plurality of first digital subscriber line boards and the first IMA interface board, respectively. The method of claim 2, The first IMA interface board, when transmitting the IMA frame to the centralized self DSLAM, a plurality of E1 group in a random group, characterized in that distributed by the round-robin method to transmit the remote DSLAM. The method of claim 2, The IMA frame includes a plurality of ATM cells in which data such as voice, picture, text, and the like are stored; A plurality of filler cells in which null data is stored; And And remote ISL device comprising header information such as E1 location information and error check information of the ATM and filler cells. The method of claim 2, The first IMA interface board checks the impedance and alarm when receiving the IMA frames through the plurality of E1 lines from the lumped self DSLAM, and transmits them after receiving the IMA frames, respectively. A plurality of first line interface unit for transmitting to the DSLAM; It is connected one-to-one with the plurality of first line interface units, and when receiving each IMA frame from the first line interface unit, extracts and transmits an ATM cell from the IMA frame, and receives each of the plurality of ATM cells. A plurality of first subscriber network interface units which are converted to the first line interface unit and transmitted to the first line interface unit; When a plurality of ATM cells are received from the plurality of first subscriber network interface units, the plurality of ATM cells are muxed and the destination information is inserted into the ATM cells and transmitted. When receiving a plurality of ATM cells, the plurality of ATM cells are demuxed. A first IMA unit for distributing and transmitting the data to the first subscriber network interface unit; A first cell multiplexer which performs a buffering function after receiving a plurality of ATM cells from the first IMA unit; When the plurality of ATM cells are received from the first cell multiplexer, the plurality of ATM cells are transmitted to the corresponding first digital subscriber line board through a cell bus, and when the plurality of ATM cells are received from the plurality of first digital subscriber line boards, the first plurality of ATM cells are received. A first cell bus interface for transmitting to a cell multiplexer; And And a first CPU configured to perform various control functions of the plurality of first line interface units, the plurality of first subscriber network interface units, the first IMA unit, the first cell multiplexer, and the first cell bus interface unit. Remote DSLAM device. The method of claim 5, The plurality of first subscriber network interface units and the first IMA unit and the first IMA unit and the first cell multiplexer are connected in a utopia level 2 scheme, while a utopia level is established between the first cell multiplexer and the first cell bus interface unit. Remote DSL device, characterized in that connected in one way. The method of claim 1, The centralized DSLAM converts the received ADSL subscriber traffic from the plurality of ADSL subscriber modems into ATM cells, and transmits the converted ADSL subscriber traffic to the corresponding ADSL subscriber modems. A plurality of second digital subscriber line boards; One-to-one connection with the plurality of modem self DSLAMs and an E1 line, when receiving an IMA frame from the corresponding modem self DSLAM, extracts and transmits an ATM cell from the IMA frame, and converts it to an IMA frame when a plurality of ATM cells are received. A second IMA interface board for transmitting to the corresponding modem self DSLAM through the E1 line; Connected to the plurality of second digital subscriber line boards and the second IMA interface board through a cell bus to collect ATM cells from the plurality of second digital subscriber line boards or the second IMA interface board and transmit the collected ATM cells to an ATM switch. On the other hand, when receiving a plurality of ATM cells from the ATM switch, a centralized self uplink board for distributing and transmitting to the plurality of second digital subscriber line board or the second IMA interface board; And And a centralized self management board configured to perform operations and management functions of the plurality of second digital subscriber line boards, the second IMA interface board, and the centralized self uplink board. The method of claim 7, wherein The second IMA interface board, when transmitting the IMA frame to the modem self DSLAM, a plurality of E1 group in a random group, characterized in that distributed by the round robin method to transmit distributed. The method of claim 7, wherein The IMA frame includes a plurality of ATM cells in which data such as voice, picture, text, and the like are stored; A plurality of filler cells in which null data is stored; And And remote ISL device comprising header information such as E1 location information and error check information of the ATM and filler cells. The method of claim 7, wherein The second IMA interface board checks the impedance and alarm when receiving the IMA frames from the modem self DSLAM through a plurality of E1 lines, respectively, and transmits the received IMA frames. A plurality of second line interface units transmitting to the DSLAM; One-to-one connection with the plurality of second line interface units, when receiving each IMA frame from the second line interface unit, extracts and transmits an ATM cell from the IMA frame, and receives each of the plurality of ATM cells, and then receives the IMA frame. A plurality of second subscriber network interface units for converting the data to the second line interface unit; When a plurality of ATM cells are received from the plurality of second subscriber network interface units, the plurality of ATM cells are muxed and the destination information is inserted into the ATM cells and transmitted. When receiving a plurality of ATM cells, the plurality of ATM cells are demuxed. A second IMA unit for distributing and transmitting to two second subscriber network interface units; A second cell multiplexer which performs a buffering function after receiving a plurality of ATM cells from the second IMA unit; When the plurality of ATM cells are received from the second cell multiplexer, the plurality of ATM cells are transmitted through the cell bus to the lumped self uplink board, and when the plurality of ATM cells are received from the lumped self uplink board, they are transferred to the second cell multiplexer. A second cell bus interface unit for transmitting; And And a second CPU for performing various control functions of the plurality of second line interface units, the plurality of second subscriber network interface units, the second IMA unit, the second cell multiplexer, and the second cell bus interface unit. Remote DSLAM device. The method of claim 10, The second subscriber network interface unit and the second IMA unit and the second IMA unit and the second cell multiplexer are connected and configured in a utopia level 2 scheme, and between the second cell multiplexer and the second cell bus interface unit. A remote DSLAM device characterized by being connected by a utopia level 1 scheme.