KR19990086063A - Network Access Device in ADS Broadband Service Network - Google Patents

Abstract

The present invention provides an efficient and economical network access device by implementing a network access system in an independent self unit or rack unit according to the number of subscribers and system requirements in a network access device having one network link per rack. The present invention relates to a network access device in an ADS broadband service network. The present invention relates to an ADSL network connection in a central station for interfacing a broadband public network with a subscriber system according to the number of subscribers. In the case of rack unit and ADSL network connection unit in rack unit, one master self and a plurality of sub self interface interface ADSL data by connecting ring type structure, accommodating more subscribers, Efficient and economical network connection by changing the system configuration Will be implemented.

Description

Network Access Device in ADS Broadband Service Network

The present invention relates to an asymmetric digital subscriber line (ADSL) broadband service system. In particular, an independent self (Shelf) according to the number of subscribers and system requirements in a network access device having one network link per rack (RACK) The present invention relates to a network access device in an ADS broadband service network which attempts to obtain an efficient and economical network access device by implementing a network access system in units or racks.

In general, an important feature of the ADSL system is that it provides high-speed digital data services simultaneously without interfering with the analog telephone service (POTS) over twisted pair copper networks that currently exist as analog telephone lines. It can be done.

It is a technology that increases bandwidth to simultaneously transmit multimedia information such as voice, graphic, and video while using existing telephone line. Therefore, it is receiving attention as a service network that can deliver multimedia information to subscribers without incurring network installation costs.

Thus, new services can be created that can be provided to telephone subscribers such as high-speed Internet, online access and telecommuting, and video on demand (VOD). In addition, there is no need to install a new line, so it is possible to implement the service more economically and faster than using other systems.

The line coding scheme of ADSL includes DMT (Discrete Multi-Tone) and CAP (Carrier Amplitude).

This line coding method is a technology that modulates and demodulates digital data and transmits it on a twisted pair. Among them, the DMT method, which is set as a standard by the American National Standard Institute (ANSI), has a downlink transmission rate of up to 8Mbps and about 640Kbps. Data can be delivered at an uplink transmission rate.

On the other hand, the network subscriber system consisting of the existing rack (rack) is determined by the number of subscribers that can be supported in a rack-type form according to the overall configuration of the rack, because the system itself is based on the rack, Even if a large volume occupies a disadvantage that requires a lot of space.

In addition, even in a system having a small number of subscribers, since the system itself is designed based on a rack, there is a problem in that the efficiency of system configuration is also reduced.

Accordingly, the present invention has been proposed to solve the above problems of the prior art,

The present invention provides an efficient and economical network access device by implementing a network access system in an independent self unit or rack unit according to the number of subscribers and system requirements in a network access device having one network link per rack. The purpose of the present invention is to provide a network access device in an ADSL broadband service network.

A more detailed object of the present invention is configured to have a separate network high-speed interface per self, and at the same time by connecting the network interface between the self in a ring (Ring) form, one self or a plurality of self configurable system according to the number of subscribers It is to be done.

Apparatus according to the present invention for achieving the above object,

A data switching network for switching ATM data through a broadband public network, a central station for separating and switching high-speed data obtained from the data exchange network and an analog telephone obtained from a public telephone network, and a high-speed data and analog telephone connected by twisted pair with the central station. In the ADSL broadband service system consisting of a subscriber system located in the subscriber's home to mutually transmit and receive,

The central station,

The downlink data input from the switched broadband network in the data exchange network is received through a network access board, demultiplexed on an ATM cell bus, separated into ATM cells, and transmitted to a subscriber side. The uplink data transmitted from the subscriber side is transmitted to the ATM. An ADSL network connection unit multiplexed on a cell bus and transmitting to the broadband network through the data exchange network through the network access board;

An ADSL network manager that controls an uplink network access board in the ADSL network access unit and collects subscriber information and network related information from the network access board to control and operate a network;

A public telephone network switch connected to the public telephone network to switch a subscriber analog telephone;

In the case of downlink transmission of subscriber data transmitted from the ADSL network connection unit, the subscriber data and the analog telephone transmitted from the public telephone network switch are mixed and transmitted to the subscriber unit, and the uplink data and analog telephone transmitted from the subscriber unit are separated and the subscriber is separated. The data is transmitted to the ADSL network connection, and the analog phone is characterized in that it is configured as an analog phone separation unit for transmitting to the public telephone network switch.

In the above, the ADSL network connection,

According to the number of subscribers, the system is configured by an independent self unit or a rack unit consisting of one master self and a plurality of sub self.

In the above, the ADSL network connection unit of the self unit,

A network interface unit connected to the data exchange network to control an interface of uplink data and downlink data;

A control and management unit that interfaces control and management information through the ADSL network management unit and an Ethernet interface and provides a control line interface for system initialization, configuration, and control through a serial interface;

The downlink data transmitted through the network interface unit under the control of the control and management unit is demultiplexed and delivered to the subscriber side, and only the ATM cell is extracted and multiplexed from the uplink data transferred from the analog phone separation unit and then the network interface unit Characterized in that consists of a subscriber board portion consisting of a plurality of ADSL subscriber board to deliver to.

In the above, the ADSL network connection unit of the rack unit,

A master network interface unit for controlling the interface of the uplink data and the downlink data;

A control and management unit that interfaces control and management information through the ADSL network management unit and an Ethernet interface and provides a control line interface for system initialization, configuration, and control through a serial interface;

The downlink data transmitted through the master network interface unit by the control and management unit is demultiplexed and transmitted to the subscriber side, and only the ATM cell is extracted and multiplexed from the uplink data transferred from the analog phone separation unit to the master network interface. A master self consisting of a subscriber board unit including a plurality of ADSL subscriber boards to transfer to the unit;

The sub network interface unit for interfacing the up and down data with the master network interface unit in the master shelf and a subscriber board unit including a control and management unit and a plurality of ADSL subscriber boards.

In the above, the ADSL subscriber board,

A cell bus interface controller for multiplexing and demultiplexing ATM cells on a cell bus;

A cell multiplexing / demultiplexing unit which is provided between the cell bus interface control unit and an ATM handler at a later stage to multiplex and demultiplex cell streams transmitted and received between the cell bus interface control unit and the ATM handler;

The ATM handler for inserting and removing idle cells of the transmitted and received ATM cells, scramble and descramble cell payload, cell processing, HEC checking and generation, and converting an ATM utopia interface to a modem byte interface;

An ADSL transceiver for demodulating the ATM cell delivered from the ATM handler and demodulating the ATM cell delivered from the subscriber side;

A line driver interposed between the ADSL transceiver and the analog telephone separator to perform a line interface;

A microprocessor for multiplexing / demultiplexing control of the cell bus interface control unit, cell stream multiplexing / demultiplexing control of the cell multiplexing / demultiplexing unit, cell processing control of the ATM handler, and modulation / demodulation control of the ADSL transceiver. It is characterized by.

In the above, the master network interface unit,

A first transceiver connected to a broadband network and interfacing an ADSL frame through a 45 Mbps T3 or 155 Mbps OC-3c interface;

A first user network processor connected to the first transceiver and extracting only an ATM cell from a downlink or uplink data frame of T3 or OC-3c;

Demultiplex the ATM cells extracted from the first user network processor, multiplex the ATM cells of uplink data, deliver only cells for the corresponding subscriber self to the cell bus interface, and cells for other sub self A cell multiplexer / demultiplexer for transmitting to the side;

A cell bus interface controller which delivers the demultiplexed subscriber cells in the cell multiplexer / demultiplexer to a cell bus and delivers the subscriber cells via the cell bus to the cell multiplexer / demultiplexer;

A cell delivered to another sub selfie side obtained in the cell multiplexing / demultiplexing unit is selectively delivered to second to fourth transceivers, and an ATM cell is transmitted from uplink data of the other sub selfie side transmitted through the second to fourth transceivers. A second to fourth user network processor extracting only and transferring the extracted cell to the cell multiplexer / demultiplexer;

Cells on the other sub-self side obtained from the second to fourth user network processors are transferred to the other sub-self side through the set interface, and subscriber data transferred from the other sub-self side are selective to the second to fourth user network processors. Characterized in that consisting of the second to fourth transceiver for transmitting to.

In the above, the cell multiplexing / demultiplexing unit,

A first-in, first-out (first-in, first-out) unit for first-in first-out of a downlink subscriber cell obtained from the first user network processor;

A cell demultiplexer for demultiplexing subscriber cells obtained from the first first-in-first-out machine;

A second first-in, first-out first-in, first-out of the demultiplexed cell obtained from the cell demultiplexer and delivered to the subscriber side connected to the self;

Third to fifth first-in, first-out and first-in-first-outs of the demultiplexed cells obtained from the cell demultiplexer and delivered to another sub-self side;

A sixth first-in, first-out (first-in, first-out) unit for first-in first-out of a subscriber cell connected to its own self obtained from the cell bus interface controller;

A seventh to ninth first-in, first-out first-in, first-out of the subscriber cell delivered from another sub-self obtained from the second to fourth user network processors;

A cell multiplexer for multiplexing subscriber cells respectively obtained by the sixth to ninth first-in, first-outs;

And a tenth first-in, first-out, which first-in-first-out of the multiplexed subscriber cells in the cell multiplexer and delivering the first-user first-time network to the first user network processor.

The sub network interface unit in the sub shelf,

A transceiver for transmitting and receiving subscriber data with the master network interface unit;

A user network processor extracting only an ATM cell from downlink data obtained from the transceiver and uplink data obtained from a subscriber;

The subscriber cell of the downlink data obtained from the user network processor is transmitted to the corresponding subscriber via a cell bus, and the uplink data transmitted from the subscriber is configured to be a cell bus interface controller for transmitting to the user network processor.

1 is a block diagram of a network connection device having a ring network link according to the present invention;

FIG. 2 is a detailed configuration diagram of the ADSL-LT subscriber board of FIG. 1; FIG.

3 is a detailed configuration diagram of the network connection portion of FIG.

(a) is a system configuration diagram when a network connection unit is implemented in a rack unit,

(b) is a system configuration diagram when a network connection unit is implemented in units of self,

4 is a detailed configuration diagram of the network interface board of FIG.

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

100: data exchange network 200: public telephone network

300: central station (ADSL network connection) 310,370: ADSL network connection

371: master network interface unit 372: control and management unit

373: Subscriber board unit 320: ADSL network management unit

330: public telephone network switch 340: analog telephone separation unit

350: Local control terminal 374-376: Sub network interface unit

400: twisted pair 500: subscriber system

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

1 is a block diagram of a network connection device having a ring-shaped network link according to the present invention.

As shown therein, the data exchange network unit 100 which performs the ADSL broadband service over the broadband public network, and the high-speed data obtained through the data exchange network unit 100 and the analog telephone obtained from the public telephone network 200 are mutually separated from each other. The central station 300, which is an ADSL network access system for switching, and the subscriber station 500, which is connected to the central station 300 and the twisted pair 400, is located in the subscriber's home that transmits and receives high-speed data and analog telephones to and from each other. It is composed.

In the above description, the data exchange network unit 100 is a broadband public network 150 connected to an instruction set processor (ISP) 110, a server 120, the Internet 130, and an ATM switch 140. ), A router 170 for connecting the Internet 160, and an ATM gateway 180 for an ATM cell interface between the router 170 and the ATM switch 140.

In addition, the subscriber system 500 includes an analog telephone separation unit 511 connected to the twisted pair 400 to separate subscriber data and an analog phone and an ADSL transceiver 512 to interface subscriber ADSL data. Transmits and receives 25 Mbps data of the ADSL subscriber modem 510, the general telephone 520 present on the subscriber side and connected to the analog telephone disconnecting unit 511, and the ATM form obtained from the ADSL subscriber modem 510. The terminal 530 is connected to the ADSL subscriber modem 510 and is configured of an interface device 540 for Ethernet 10BaseT connection and a plurality of terminals 550 connected thereto.

The operation of the network access device in the ADSL broadband service network having a ring structure according to the present invention configured as described above is as follows.

First, as shown in Figure 1, the network connection device 300 according to the present invention is connected to the backbone network (Backbone Network) 100, that is, the data backbone network, ATM network for the interface of high-speed data, analog telephone Is connected to a PSTN network, which is a public telephone network 200.

And the existing twisted pair 400 is used as it is for the data and the interface of the analog phone with the subscriber.

That is, the ADSL network access system 300 connects ATM 155Mbps OC-3c or ATM 45Mbps T3 to the uplink network access board from the broadband network, and the data input from the broadband network is multiplexed on the ATM cell bus. The demultiplexed or switched data modulated via the ADSL subscriber board is mixed with the analog telephone data obtained from the public telephone network 200 and transmitted to the subscriber unit 500 through the existing twisted pair 400.

Here, the telephone line connected to the subscriber is separated from the telephone service data through the analog telephone separator 511 in the subscriber's premises, and only the modulated ADSL data is input to the subscriber system, and in the ADSL transceiver 512, the ADSL demodulation and the ADSL frame are performed. ATM cell data extraction is performed.

If the subscriber interface to the PC or TV is 25 Mbps of the ATM Forum, it is connected to the terminal 530 or the TV through the UTP-3 cable through the ATM Forum 25 Mbps I / F TC + PMD (Physical Medium Dependent) device. .

In addition, when the subscriber interface to the terminal or TV is Ethernet 10BaseT, ATM cell data extracted from the interface unit 540 is used for segmentation & reassembly (SAR) function of ATM Adaptation Layer and cell demultiplexing based on VC. After converting to Ethernet packet data, it is interfaced to the terminal 550 through the MAC controller and the line driver.

Meanwhile, the uplink data transmitted from the subscriber via the ADSL subscriber unit 500 through the telephone line 400 is transferred from the ADSL frame through the ADSL transceiver of the ADSL subscriber board (described in detail below) of the central station 300, which is a network access system. After extracting ATM cell data, the ATM cell bus is multiplexed on the ATM cell bus and connected to the broadband data exchange network unit 100 through the uplink network access board.

Here, the central station 300, which is an ADSL network access system, controls and operates an ADSL subscriber board and an uplink network access board, and collects subscriber information and network related state information from these boards and transmits them to the ADSL network management system. Have an operation board (described in more detail below). The control / operation board performing such network control and network operation operates under the SNMP Agent protocol.

Hereinafter, the ADSL network access device (central station), which is the core of the present invention, will be described in detail.

First, the ADSL network access device 300 according to the present invention receives downlink data input from a broadband network through a network access board, demultiplexes it on an ATM cell bus, separates it into ATM cells, and transmits it to a subscriber side. Uplink data transmitted from the subscriber side is multiplexed on the ATM cell bus and transmitted to the broadband network through the network access board; An ADSL network manager 320 for controlling an uplink network access board in the ADSL network access unit 310 and collecting and subscribing subscriber information and network related information from the board to efficiently control and operate a network; A public telephone network switch 330 connected to the PSTN network 200 to switch subscriber analog telephones; When the subscriber data transmitted from the ADSL network connection 310 is transmitted downward, the subscriber data and the analog telephone transmitted from the public telephone network switch 310 are mixed and transmitted to the subscriber system 500, and the subscriber system 500 The uplink data transmitted from the analog phone and the analog phone are separated, and the subscriber data is transmitted to the ADSL network connection unit 310, and the analog phone is composed of an analog phone separation unit 340 for transmitting to the public telephone network switch 330.

Here, the ADSL network connection unit 310 may be configured in a self unit and a rack unit according to the number of subscribers. When the number of subscribers is small, the ADSL network connection unit 310 configures the system only in self units as shown in FIG. When the number is large, as shown in FIG. 3 (b), a rack unit system including a plurality of shelves is configured as one rack.

First, as shown in (a) of FIG. 3, the self-connected network access device is connected to an ATM switch 140 in the data switching network unit 100 to control an interface of upstream data and downstream data. A control and management unit that interfaces control and management information through the sub-network interface unit 311, the ADSL network management unit 320, and an Ethernet interface, and provides a control line interface for system initialization, configuration, and control through a serial interface. 312 and the downlink data transmitted through the sub-network interface unit 311 under the control of the control and management unit 312 are demultiplexed and transmitted to the subscriber side, and is transmitted from the analog phone separation unit 340. A plurality of ADSL which extracts and multiplexes only ATM cells from upstream data and delivers them to the sub-network interface unit 311. It consists of a subscriber board 313 composed of subscriber boards 313-1 through 313-n.

Here, the self-unit ADSL network connection unit 310 may be configured by connecting a local control terminal 350 for local control to the control and management unit 312.

When the ADSL network connection unit of the self unit is configured, it connects to the broadband network through the uplink network access board in the self, and inserts the self into a separate box having an analog telephone separation unit 340 suitable for the number of subscribers supported by the self. The self unit system is configured.

The network management unit 320, which is a control / management board, communicates control and management information through an Ethernet interface to the ADSL network management system, and a control line interface through a terminal for system initialization, configuration, and control through a serial interface. Provides (Command Line Interface). For control line interface, use serial interface such as DB25 or DB9 RS-232.

Next, the ADSL network connection unit 370 in the case of configuring the ADSL network connection unit 310 in units of racks due to the large number of subscribers, as shown in FIG. Control to interface control and management information through the master network interface unit 371, the ADSL network management unit 320 and the Ethernet interface to control and to provide a control line interface for system initialization, configuration and control through a serial interface and The downlink data transmitted through the master network interface unit 371 under the control of the management unit 372 and the control and management unit 372 is demultiplexed and transmitted to the subscriber side, and is transmitted from the analog phone separation unit 340. A plurality of ATM cells are extracted from the upstream data and multiplexed to the master network interface unit 371. The ADSL subscriber boards (373-1 - 373-n) master self (370-1) comprising a subscriber board section (373) including a; The sub network interface units 374, 375, 376, the control and management units 377, 378, 379, and the plurality of ADSL subscriber boards 373-1-373-n that interface the up and down data with the master network interface unit 371 in the master shelf 373. It is characterized by consisting of a plurality of sub-self (370-2-370-4) consisting of a subscriber board portion 373 including a).

Here, the ADSL network connection unit 370 of the rack unit may be configured by connecting a local control terminal 350 for local control to the control and management units 372 and 377-379.

In case of implementing ADSL network connection in rack unit, it consists of about 4 ADSL line shelves per rack, and has a direct network interface with broadband network in rack unit and a master shelf having control / management interface in rack unit. -1) and the subframes 370-2 to 370-4 that perform network interface and control / management through the master shelf.

The master network interface 371 in the master self 370-1 separates ATM data cells coming from the broadband network, extracts data cells for the corresponding master self subscribers, and delivers them to the corresponding subscribers. It also performs a function of separating and transferring the data cells corresponding to the.

On the contrary, the master network interface unit 371 multiplexes the uplink data cells coming from the subscribers and the uplink data cells coming from each of the subsystems 370-2-370-4 and delivers them to the broadband network.

Similarly, the control / management unit 372 of the master self 370-1, which is a ring-shaped end self, is transferred and collected from the control / management board of each self via a serial interface to the ring structure. It connects through Ethernet interface and provides control line interface through serial interface to control terminal.

In the above, the uplink network access board and the control / management board may be implemented as a single board in order to facilitate system implementation and support a maximum subscriber board per self.

Here, the control / management unit in the system master self that is directly connected to the broadband network and directly connected to the ADSL network management system must provide status information on the broadband network access interface separately, and must have additional control / management functions for the entire system. do.

Hereinafter, the function and operation of each part will be described in more detail.

First, since the configuration of the master self when the ADSL network access device is implemented in units of self or when the ADSL network access device is implemented in units of rack is the same, only the master self in the unit of rack will be described below.

First, in FIG. 1, the high speed downlink data transmitted from the data exchange network unit 100 is interfaced in the master network interface unit 371 in the master shelf 370-1 in the ADSL network connection unit 370.

That is, the master network interface 371 includes a first transceiver 31 connected to a broadband network and interfacing an ADSL frame through a 45 Mbps T3 or 155 Mbps OC-3c interface as shown in FIG. 4; A first user network processor (32) connected to the first transceiver (31) and extracting only an ATM cell from a downlink or uplink data frame of T3 or OC-3c; Demultiplex the ATM cells extracted from the first user network processor 32, multiplex the ATM cells of uplink data, deliver only cells for the corresponding subscriber self to the cell bus interface 34, and A cell multiplexer / demultiplexer (33) for delivering the cell to the other sub-self side; A cell bus interface controller which delivers the demultiplexed subscriber cells in the cell multiplexer / demultiplexer 33 to a cell bus and transmits the subscriber cells transmitted through the cell bus to the cell multiplexer / demultiplexer 33; 34); Cells delivered to the other sub selfies obtained by the cell multiplexing / demultiplexing unit 34 are selectively delivered to the second to fourth transceivers 38 to 40, and the second to fourth transceivers 38 to 40 are transferred. Second to fourth user network processors (35 to 37) for extracting only ATM cells from the uplink data of other sub-selfs delivered through the sub-self and transmitting them to the cell multiplexer / demultiplexer (33); Cells on the other sub-self side obtained from the second to fourth user network processors 35 to 37 are transferred to the other sub-self side through the set interface, and subscriber data transferred from the other sub-self side is transmitted to the second to fourth sub-sides. And second to fourth transceivers 38 to 40 that selectively communicate to user network processors 35 to 37.

In the above, the cell multiplexing / demultiplexing unit 33 includes: a first first-in first-out (33a) for first-in first-out of a downlink subscriber cell obtained from the first user network processor 32; A cell demultiplexer (33b) for demultiplexing subscriber cells obtained from the first-in, first-out (33a); A second first-in first-out (33c) for first-in first-out of the demultiplexed cell obtained from the cell demultiplexer (33b) and delivering it to the subscriber side connected to the self; Third to fifth first-in, first-out (33d-33f) for first-in first-out of the demultiplexed cell obtained from the cell demultiplexer (33b) and for delivery to another sub-self side; A sixth first-in first-out (33g) for first-in first-out of a subscriber cell connected to its own self obtained from the cell bus interface controller 34; Seventh to ninth first-in, first-out (33h-33j) for first-in first-out of the subscriber cell delivered from the other sub-self side obtained in the second to fourth user network processors (35-37); A cell multiplexer (33k) for multiplexing subscriber cells respectively obtained by the sixth to ninth first-in, first-out (33h-33j); It consists of a first-in, first-out (33m) to first-in, first-out of the subscriber cell multiplexed by the cell multiplexer (33k) to deliver to the first user network processor (32).

The sub network interface units 374 to 376 may include transceivers 374a, 375a and 376a for transmitting and receiving subscriber data to and from the master network interface unit 371;

User network processors (374b, 375b, 376b) for extracting only ATM cells from downlink data obtained from the transceivers (374a, 375a, 376a) and uplink data obtained from the subscriber side; The subscriber cell of downlink data obtained from the user network processors 374b, 375b and 376b is delivered to the corresponding subscriber via a cell bus, and the uplink data transmitted from the subscriber is transmitted to the user network processors 374b, 375b and 376b. Cell bus interface controllers 374c, 375c, and 376c.

The master network interface unit 371 configured as described above, when high-speed data is transmitted to the first transceiver 31 that is the uplink network access board of the master self via a 45 Mbps T3 or 155 Mbps OC-3c interface, receives the first user network processor ( 32) extracts only ATM cells from the T3 or OC-3c transport frame, identifies the cell boundary of the ATM layer, cell payload scramble / descramble, checks and generates header error control (HEC), creates and removes Idle cells, It performs transmission convergence (TC) functions such as framing / deframing and PMD functions such as clock and data recovery (CDR), and delivers the processed cells to the cell multiplexer / demultiplexer 33.

The first first-in-first-out (33a) in the cell multiplexing / demultiplexing unit (33) is to first-in first-out the delivered ATM cell, the cell demultiplexer (33b) demultiplexes the delivered cell, VPI / VCI of the cell Check and transmit only the cells for the subscriber self (master self) to the second first-in-first-out (33c), cells to be delivered to the other sub-self selectively to the third to fifth first-in, first-out (33d-33f) Deliver it.

The second first-in-first-out (33c) is to first-in-first-out the delivered demultiplexed subscriber cell to the cell bus interface controller 34, the cell bus interface controller 34 to each ADSL subscriber board on the cell bus Routing table and tag management, bus arbitration, etc. to perform multiplexing / demultiplexing are performed, and the delivered cell is floated on the cell bus.

In addition, the third to fifth first-in, first-out (33d to 33f) is first-in, first-out of the cells to be delivered to the other sub-self and selectively delivered to the second to fourth user network processor (35-37). Here, the third to fifth first-in first-out (33d-33f) and the second to fourth user network processor (35-37) is configured such that one first-in first-out and one user network processor correspond one-to-one.

The second to fourth user network processors 35 to 37 perform the same function as the above-described first user network processor 32 to process the transferred ATM cells, and process the processed ATM cells to the second to fourth. Optionally transmit to transceivers 38-40. Here, one user network processor and one transceiver correspond one-to-one.

On the other hand, the second to fourth transceivers 38 to 40 correspond to cells of other sub-cells delivered from the second to fourth user network processors 35 to 37, respectively, through the ring-shaped interface. It is selectively delivered to the cell, and the cells delivered from each of the subsystems are collected and delivered to the second to fourth user network processors 35 to 37.

In the above, the sub network interface unit 374 in the sub interface interfaces upstream data and downstream data through the transceiver 374a for interfacing data with one of the transceivers 38-40 in the master network interface unit 371. do. In addition, only the cell is extracted from the subscriber data of the corresponding self transmitted from the transceiver 374a through the user network processor 374b and transmitted to the corresponding subscriber through the cell bus interface controller 374c, and the cell bus interface controller 374c. Subscriber cell data obtained from the C2 is transferred to the transceiver 374a to be delivered to the master network interface 371.

Similarly, the sub network interface unit 375 and 376 in another sub-frame also have the same configuration as the sub network interface unit 374 to perform the same function and the same operation.

Meanwhile, the second to fourth user network processors 35 to 37 process a subscriber cell obtained from another sub-carrier transmitted from the second to fourth transceivers 38 to 40 to process the seventh to ninth first-in, first-out. (33h-33j).

In addition, the subscriber cell in the master self obtained by the cell bus interface controller 34 is delivered to the sixth first-in first-out (33g), so that the cell multiplexer (33k) is the sixth to ninth first-in first-out (33g) -33j) multiplexes the subscriber cell connected to the master self and the subscriber cell connected to the sub self, respectively, and delivers the same to the first user network processor 32 through the tenth first-in-first-out (33m).

Then, the first user network processor 32 processes the upstream data, which is the subscriber data, and transmits the upstream data, which is the subscriber data, to the first transceiver 31 by a processing method different from that of the downlink data, thereby providing a broadband network. Uplink data is delivered to the.

Here, the master network interface unit 371 is controlled by the control and management unit 372 connected to the network management unit 320 to perform transmission and reception of ADSL data.

On the other hand, the downlink data cell entering the cell bus is multiplexed on the cell bus and then transferred to the corresponding subscriber board in the subscriber board unit 373, and the corresponding subscriber board processes this to the analog telephone separation unit 340. The downlink data is transmitted. Here, the subscriber board will be described in more detail as follows.

The subscriber boards 373 and 313 are provided with a plurality of subscriber boards ADSL-LT as shown in FIG. 3, and one of the ADSL subscriber boards is shown in FIG. 2. A cell bus interface controller 373a for multiplexing and demultiplexing the ATM cells; Cell multiplexing, which is placed between the cell bus interface controller 373a and the ATM handler 373c at the next stage and multiplexes and demultiplexes the cell streams transmitted and received between the cell bus interface controller 373a and the ATM handler 373c. / Demultiplexer 373b; The ATM handler 373c for inserting and removing idle cells of the transmitted and received ATM cells, scramble and descramble cell payloads, cell processing, HEC checking and generation, and converting an ATM utopia interface to a modem byte interface; An ADSL transceiver 373d which demodulates an ATM cell delivered from the ATM handler 373c and modulates an ATM cell delivered from a subscriber side; A line driver 373e disposed between the ADSL transceiver 373d and the analog telephone separator 340 to perform a line interface; Multiplexing / demultiplexing control of the cell bus interface controller 373a, cell stream multiplexing / demultiplexing control of the cell multiplexing / demultiplexing unit 373b, cell processing control of the ATM handler 373c, and the ADSL transceiver 373d And a microprocessor 373f in charge of modulation / demodulation control.

The subscriber board configured as described above multiplexes the ATM cells on the cell bus by the cell bus interface controller 373a and transfers the ATM cells to the cell multiplexer / demultiplexer 373b.

The cell multiplexing / demultiplexing unit 373b demultiplexes one cell stream into four cell streams in order to accommodate the four-subscriber interface in one board, and demultiplexes the demultiplexed cell into an ATM handler. 373c).

The ATM handler 373c removes Idle cells of the demultiplexed cells, descrambles the cell payload, performs cell descriptions, performs HEC checks, and simultaneously performs ATM control under the control of the microprocessor 373f. It will convert the utopia interface to the modem byte interface.

In addition, the ADSL transceiver 373d forms an ADSL frame of the ATM cell delivered from the ATM handler 373c, demodulates the original data, and delivers the original data to the line driver 373e, which the line driver 373e receives. Transfer to the phone separator 340.

The analog telephone separator 340 mixes the transmitted downlink data and the analog telephone data transmitted from the public telephone network switch 330 and transmits the same to the subscriber through the existing twisted pair 400.

On the other hand, the uplink data and the analog phone data transmitted from the subscriber side is transmitted to the analog telephone splitter 340 in the central station 300 through the twisted pair 400, the analog telephone splitter 340 is transmitted The analog telephone is separated from the ADSL data and transferred to the public telephone network switch 330 so that the telephone service is performed through the PSTN 200 as before.

In addition, the separated ADSL upstream data is transmitted to the subscriber board 313 and is delivered to the ADSL transceiver 373d through the line driver 373e.

The ADSL transceiver 373d modulates the forwarded data to be delivered to the ATM handler 373c, and the ATM handler 373c inserts an Idle cell into the delivered subscriber cell and scrambles the cell payload. The HEC is generated and processed, and then transferred to the cell multiplexer / demultiplexer 373b.

Then, the cell multiplexing / demultiplexing unit 373b multiplexes the four subscriber's cells into one data in order to accommodate the four subscriber interface in one board, and then transfers the cells to the cell bus interface controller 373a. It is put on the cell bus 360 by the interface controller 373a.

Such downlink data is processed in the reverse order as described above and is transmitted to the data exchange network unit 100 through the network interface unit 311 under the control of the network management unit 320.

The network access device according to the present invention having the above-described function is described by applying only to the ADSL broadband network access system. However, the present invention is not limited thereto. It is applicable to all systems having one broadband access link such as digital subscriber access equipment such as Carrier) and broadband access equipment such as ATM Concentrator / Multiplexor.

As described above, the present invention has the advantage that the ADSL network connection device can be configured in a self unit or a rack unit according to the number of subscribers, thereby improving the efficiency and economic efficiency of the overall network access system.

In addition, there is an advantage that it can be applied to not only ADSL network access system but also a system having one broadband access link.

Claims (11)

A data switching network for switching ATM data through a broadband public network, a central station for separating and switching high-speed data obtained from the data switching network and an analog telephone obtained from a public telephone network, and a high-speed data and analog telephone connected by twisted pair with the central station. In the ADSL broadband service system comprising a subscriber system located in the subscriber's home to mutually transmit and receive, The central station, The downlink data input from the broadband network switched in the data exchange network is received through a network access board, demultiplexed on an ATM cell bus, separated into ATM cells, transmitted to a subscriber side, and uplink data transmitted from the subscriber side is transmitted to the ATM cell bus. An ADSL network connection unit multiplexed on the network and transmitting to the broadband network through the network access board; An ADSL network manager that controls an uplink network access board in the ADSL network access unit and collects subscriber information and network related information from the network access board to control and operate a network; A public telephone network switch connected to the public telephone network to switch a subscriber analog telephone; In the downlink transmission of subscriber data transmitted from the ADSL network connection unit, the subscriber data and the analog telephone transmitted from the public telephone network switch are mixed and transmitted to the subscriber system, and the uplink data and analog telephone transmitted from the subscriber system are separated. Subscriber data is delivered to the ADSL network connection, and the analog phone is connected to the public telephone network switch, the analog telephone separation unit, characterized in that the network connection device in the broadband broadband service network. The method of claim 1, wherein the ADSL network connection, Network access device in the DS broadband service network, characterized in that the system is configured by the unit of independent self or a rack consisting of one master self and a plurality of sub-self according to the number of subscribers. The self-adhesive ADSL network connection unit according to claim 1 or 2, A network interface unit connected to the data exchange network to control an interface of uplink data and downlink data; A control and management unit that interfaces control and management information through the ADSL network management unit and an Ethernet interface and provides a control line interface for system initialization, configuration, and control through a serial interface; The downlink data transmitted through the network interface unit is controlled by the control and management unit to be demultiplexed and transmitted to the subscriber side, and only the ATM cell is extracted and multiplexed from the upstream data transferred from the analog phone separation unit to the network interface unit. Network access device in the DS broadband service network, characterized in that consisting of a subscriber board portion consisting of a plurality of ADSL subscriber board to deliver. The method of claim 3, wherein the ADSL subscriber board, A cell bus interface controller for multiplexing and demultiplexing ATM cells on a cell bus; A cell multiplexing / demultiplexing unit which is provided between the cell bus interface control unit and an ATM handler at a later stage to multiplex and demultiplex cell streams transmitted and received between the cell bus interface control unit and the ATM handler; The ATM handler for inserting and removing idle cells of the transmitted and received ATM cells, scramble and descramble cell payload, cell processing, HEC checking and generation, and converting an ATM utopia interface to a modem byte interface; An ADSL transceiver that demodulates an ATM cell delivered from the ATM handler and modulates an ATM cell delivered from a subscriber side; A line driver interposed between the ADSL transceiver and the analog telephone separator to perform a line interface; A microprocessor for multiplexing / demultiplexing control of the cell bus interface control unit, cell stream multiplexing / demultiplexing control of the cell multiplexing / demultiplexing unit, cell processing control of the ATM handler, and modulation / demodulation control of the ADSL transceiver. Network access device in the DS broadband service network, characterized in that. The method of claim 3, wherein the network interface unit, A transceiver connected to the broadband network and interfacing an ADSL frame through a 45Mbps T3 or 155Mbps OC-3c interface; A user network processor connected to the transceiver and extracting only an ATM cell from a downlink or uplink data frame of T3 or OC-3c; The ATM cell, which is extracted from the user network processor, is delivered to the subscriber side through a cell bus, and the uplink data of the subscriber transmitted through the cell bus is configured as a cell bus interface controller for delivering to the user network processor. Network access device in SL broadband service network. According to claim 1 or claim 2, ADSL network connection unit of the rack unit, A master network interface unit for controlling the interface of the upstream data and the downlink data, and the control and management information interface through the ADSL network management unit and the Ethernet interface, and provides a control line interface for system initialization, configuration and control through a serial interface The downlink data transmitted through the master network interface unit by the control and management unit and the control and management unit is demultiplexed and transmitted to the subscriber side, and only the ATM cell is extracted from the upstream data transmitted from the analog phone separation unit. A master self consisting of a subscriber board unit comprising a plurality of ADSL subscriber boards which are multiplexed and transmitted to the master network interface unit; AD, characterized in that the sub-network interface unit for interfacing the up and down data with the master network interface unit in the master shelf, a control and management unit, and a subscriber board unit including a plurality of ADSL subscriber boards Network access device in SL broadband service network. According to claim 6, When the ADSL network connection unit is implemented by the rack unit, each shelf forming a rack is divided into one master self and a plurality of sub self, and the sub self and the master self connected by a ring-shaped structure A master access device and a plurality of sub-self correspond to one-to-one to interface data in the DS broadband service network, characterized in that the network connection device. The method of claim 6, wherein the ADSL subscriber board, A cell bus interface controller for multiplexing and demultiplexing ATM cells on a cell bus; A cell multiplexing / demultiplexing unit which is provided between the cell bus interface control unit and an ATM handler at a later stage to multiplex and demultiplex cell streams transmitted and received between the cell bus interface control unit and the ATM handler; The ATM handler for inserting and removing idle cells of the transmitted and received ATM cells, scramble and descramble cell payload, cell processing, HEC checking and generation, and converting an ATM utopia interface to a modem byte interface; An ADSL transceiver that demodulates an ATM cell delivered from the ATM handler and modulates an ATM cell delivered from a subscriber side; A line driver interposed between the ADSL transceiver and the analog telephone separator to perform a line interface; A microprocessor for multiplexing / demultiplexing control of the cell bus interface control unit, cell stream multiplexing / demultiplexing control of the cell multiplexing / demultiplexing unit, cell processing control of the ATM handler, and modulation / demodulation control of the ADSL transceiver. Network access device in the DS broadband service network, characterized in that. The method of claim 6, wherein the master network interface unit, A first transceiver connected to a broadband network and interfacing an ADSL frame through a 45 Mbps T3 or 155 Mbps OC-3c interface; A first user network processor connected to the first transceiver and extracting only an ATM cell from a downlink or uplink data frame of T3 or OC-3c; Demultiplex the ATM cells extracted from the first user network processor, multiplex the ATM cells of uplink data, deliver only cells for the corresponding subscriber self to the cell bus interface, and cells for other sub self A cell multiplexer / demultiplexer for transmitting to the side; A cell bus interface controller which delivers the demultiplexed subscriber cells in the cell multiplexer / demultiplexer to a cell bus and delivers the subscriber cells via the cell bus to the cell multiplexer / demultiplexer; A cell delivered to another sub selfie side obtained in the cell multiplexing / demultiplexing unit is selectively delivered to second to fourth transceivers, and an ATM cell is transmitted from uplink data of the other sub selfie side transmitted through the second to fourth transceivers. A second to fourth user network processor extracting only and transferring the extracted cell to the cell multiplexer / demultiplexer; Cells on the other sub-self side obtained from the second to fourth user network processors are transferred to the other sub-self side through the set interface, and subscriber data transferred from the other sub-self side is selective to the second to fourth user network processors. Network access device in the DS broadband service network, characterized in that consisting of the second to fourth transceiver for transmitting to. The method of claim 9, wherein the cell multiplexing / demultiplexing unit, A first-in, first-out (first-in, first-out) unit for first-in first-out of a downlink subscriber cell obtained from the first user network processor; A cell demultiplexer for demultiplexing subscriber cells obtained from the first first-in-first-out machine; A second first-in, first-out first-in, first-out of the demultiplexed cell obtained from the cell demultiplexer and delivered to the subscriber side connected to the self; Third to fifth first-in, first-out and first-in-first-outs of the demultiplexed cells obtained from the cell demultiplexer and delivered to another sub-self side; A sixth first-in, first-out (first-in, first-out) unit for first-in first-out of a subscriber cell connected to its own self obtained from the cell bus interface controller; A seventh to ninth first-in, first-out first-in, first-out of the subscriber cell delivered from another sub-self obtained from the second to fourth user network processors; A cell multiplexer for multiplexing subscriber cells respectively obtained by the sixth to ninth first-in, first-outs; And a tenth first-in, first-out (first-in, first-out) unit for first-in, first-out and multiplexing subscriber cells multiplexed in the cell multiplexer. The method of claim 6, wherein the sub network interface unit in the sub shelf, A transceiver for transmitting and receiving subscriber data with a master network interface unit in the master self; A user network processor extracting only an ATM cell from downlink data obtained from the transceiver and uplink data obtained from a subscriber; ADS broadband broadband subscriber cell of downlink data obtained from the user network processor is transmitted to the corresponding subscriber via a cell bus, and uplink data transmitted from the subscriber is transmitted to the user network processor. Network access device in the service network.