KR20020084355A - 8 port interface device of vdsl subscriber - Google Patents

Abstract

PURPOSE: An 8-port VDSL(Very high speed Digital Subscriber Line) subscriber interface device is provided to commonly use a VDSL service at a low price by providing the VDSL service to a plurality of subscribers through a UTOPIA(Universal Test and Operations PHY Interface for ATM(Asynchronous Transfer Mode)) level 2 type in a DSLAM(Digital Subscriber Line Access Multiplexer) installed in a telephone office. CONSTITUTION: An ATM cell bus interface unit(100) receives demultiplexed ATM cell data from an upper server through a cell bus, multiplexes the received ATM cell data, and transmits the multiplexed ATM cell data. The ATM cell bus interface unit(100) receives multiplexed ATM cell data, demultiplexes the received ATM cell data, and transmits the demultiplexed ATM cell data to the upper server. A plurality of VDSL processing units(200) receive the multiplexed ATM cell data from the ATM cell bus interface unit(100), convert the received ATM cell data into analog DMT(Discrete Multi Tone) data, and transmit the analog DMT data to a subscriber side through a twisted pair line. A plurality of VDSL processing units(200) receive analog DMT data from the subscriber side, convert the received DMT data into ATM cell data, and transmit the ATM cell data to the ATM cell bus interface unit(100). A plurality of VDSL processing units(200) receive an up/down data change request signal, and adjust the transmission speed of up/down data. A device controller(300) receives the request for checking the state of a board, the use confirmation of a user, and a board connection state, checks the state of each board, confirms the use of the user, and confirms the board connection state. The device controller(300) transmits the confirmed result again. A host controller(400) transmits the up/down data change request signal to a plurality of VDSL processing units(200). The host controller(400) requests the check for the state of the board, the use confirmation of the user, and the board connection state to the device controller(300), receives the checked result from the device controller(300), and displays the received result to an operator. An external interface unit(500) connects the host controller(400) to an external debugging device for monitoring a board debugging and a board state.

Description

8 PORT INTERFACE DEVICE OF VDSL SUBSCRIBER}

The present invention relates to an 8-port Very High Speed Digital Subscriber Line system (VDSL) subscriber interface device. More specifically, the present invention relates to a multi-subscriber through a utopia level 2 scheme in a digital subscriber loop access and multiplexer (DSLAM) installed in a telephone company. The present invention relates to an 8-port VDSL subscriber interface device supporting multiple ports to accommodate multiple subscribers.

In general, VDSL is a high-speed communication service capable of moving picture content with the help of digital TV broadcasting and HDTV receivers. As a result, the live streaming of the Internet enables users to enjoy concerts of popular singers on live screens, even if they do not go to the concert hall, and through VDSL, a high-speed communication service at home, without going to a foreign language school in the middle of the city. Students will be able to take their own language courses, and unlike current TV programs, they will be able to choose the program that suits them and order it at the right time. VDSL also enables video telephony, video conferencing, and telemedicine.

Conventional VDSL is an evolution in Asymmetric Digital Subscriber Line (ADSL). At this time, ADSL is currently used as a high-speed Internet, but since it is difficult to realize video content through the UP data transmission rate of 8 Mhz and the DOWN data transmission rate of 800 Khz, the UP data transmission rate of 54 Mhz and the DOWN data transmission rate of 8 I have used VDSL with Mhz.

However, the conventional ADSL has a difficult problem because the transmission speed is low to realize the video content, VDSL is a difficult problem to commercialize because the video content is possible, but the price is too expensive as the optical cable must be installed to each subscriber up to the remote DSLAM There was this.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a VDSL service at a low price by providing a VDSL service to a plurality of subscribers through a Utopia Level 2 scheme in a DSLAM installed in a telephone company. An 8-port VDSL subscriber interface device is commercially available.

In order to achieve the above object, the 8-port VDSL subscriber interface device of the present invention multiplexes and receives demultiplexed ATM cell data through a cell bus from an upper Internet server or a video server, and reverses the received multiplexed ATM cell data. An ATM cell bus interface for multiplexing and transmitting the multiplexed data to a higher Internet server or a video server through the cell bus;

Connected to the ATM cell bus interface unit in a utopia level 2 scheme, upon receiving multiplexed ATM data from the ATM cell bus interface unit, it converts the VDSL in-band frequency-modulated analog DMT data into a subscriber side via a twisted pair line. When transmitting to the VDSL modem and receiving the VDSL in-band frequency modulated analog DMT data from the VDSL modem of the subscriber side, it converts the ATM data to the ATM cell bus interface unit and receives the up / down data change request signal. Receiving a plurality of VDSL processing units for adjusting the transmission rate of the up / down data;

When the board is requested to check the status of the board, check the use of the user and the board connection status, check the status of each board, check the user's use, and the board connection status, and transmits the corresponding results again, while the plurality of VDSL processing units And a device controller for supplying a driving or synchronous clock to each board;

The device transmits an up / down data change request signal to the plurality of VDSL processing units, requests the device controller to check a board state, a user's use, and a board connection state to the device controller, and then returns the corresponding result. A host controller configured to display an operator when receiving an input from the device controller; And

In order to monitor the board debugging and board status, an external interface for connecting the external debugging device and the host controller is characterized in that the configuration.

1 is a functional block diagram showing an internal configuration of an 8-port VDSL subscriber interface device according to an embodiment of the present invention;

FIG. 2 is a functional block diagram illustrating a detailed configuration of a VDSL processor of the 8-port VDSL subscriber interface device according to FIG. 1.

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

100: ATM cell bus interface unit 200: VDSL processing unit

210: VDSL DMT processing unit 220: analog front end

230: line driver line filter 240: VDSL DSP controller

300: device controller 400: host controller

500: external interface unit

Hereinafter, an eight-port VDSL subscriber interface device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram of an 8-port VDSL subscriber interface device according to an embodiment of the present invention, the 8-port VDSL subscriber interface device according to an embodiment of the present invention is an Asynchronous Transfer Mode (ATM) cell bus interface (Cell Bus) An interface unit 100, a plurality of VDSL processing unit 200, a device controller 300, a host controller 400, and an external interface unit 500 are included.

When the ATM cell bus interface unit 100 receives demultiplexed ATM cell data from an upper Internet server or a video server through a cell bus, the ATM cell bus interface unit 100 multiplexes and transmits the demultiplexed ATM cell data to the VDSL processing unit 200. When receiving multiplexed ATM cell data from the VDSL processor 200, the multiplexed ATM cell data is demultiplexed and transmitted to the upper Internet server or video server through the cell bus. At this time, if ATM cell data is received through the cell bus from the upper internet server or video server, the VPI (Virture Path Identifier) / VCI (Virture Channel Identifier) of the ATM cell data is read and the corresponding VDSL processing unit is used. Is sent to the subscriber.

In addition, the plurality of VDSL processing units 200 are connected to the ATM cell bus interface unit 100 in a utopia level 2 manner, and when receiving multiplexed ATM data from the ATM cell bus interface unit 100, analog DMT (Discrete) Multi-tone data is transmitted to the VDSL modem of the subscriber side through a twisted pair line, and when receiving analog DMT data from the VDSL modem of the subscriber side, the ATM cell bus interface unit 100 is converted into ATM data. And transmit the up / down data change request signal from the host controller 400, respectively, and adjust the transmission rate of the up / down data, as shown in FIG. Similarly, the VDSL DMT processing unit 210, the analog front end unit 220, the line driver line filter 230, and the VDSL digital signal processor (DSP) controller 240 may be used. It is made. In this case, since the plurality of VDSL processing units 200 are interfaced with the ATM cell bus interface unit 100 in a utopia level 2 scheme, up to 32 ports can be connected.

The VDSL DMT processor 210 is connected to the ATM cell bus interface 100 at utopia level 2, and converts ATM data from the ATM cell bus interface 100 to digital DMT data and corrects forward errors. Performs a function and transmits it to the analog front end unit 220, receives the digital DMT data from the analog front end unit 220, converts it into ATM data, and transmits the same to the ATM cell bus interface unit 100. When the up / down data control signal is received from the VDSL DSP controller 240, the up / down data transmission rate is adjusted. In this case, the VDSL DMT processor 210 may provide various services to the subscriber by setting the data transmission rate of the VDSL symmetrically or asymmetrically through the up / down data control signal from the VDSL DSP controller 240.

In addition, when the analog front end unit 220 receives the digital DMT data from the VDSL DMT processing unit 210, the analog front end unit 220 converts the analog DMT data through a D / A (Digital / Analog) converter and simultaneously operates at 0 hz to 11.04 Mhz. After filtering the transmission band through a band filter, fast Fourier frequency modulation through fast fourier transform (FFT) to filter the filtered 0 hz to 11.04 Mhz in-band frequency-modulated analog DMT data at a rate of 52 Mb / p After transmitting to the filter 230 and receiving analog DMT data of 0 hz to 11.04 Mhz from the line driver line filter 230, demodulating the frequency-modulated analog DMT data into 0 hz to 11.04 Mhz in-band through IFFT. Converted into digital DMT data through an A / D converter and transmitted to the VDSL DMT processing unit 210, and filtering the interference of radio frequency through the RFI remover and tone detector To remove it. At this time, the frequency band of 0 hz ~ 11.04 Mhz is the VDSL band, the use range is as follows. The 0 hz to 150 Khz band is used for the Plain Old Telephone Service (POST) and ISDN, and the 150 Khz to 11.04 Mhz band is the frequency band for transmitting data.

The line driver line filter 230 amplifies the gain of the analog DMT data to 3 dB when receiving the frequency-modulated analog DMT data from 0 hz to 11.04 Mhz band from the analog front end unit 220 to a twisted pair line. While transmitting to the VDSL modem of the subscriber side through the VDSL modem of the subscriber side, when the frequency-modulated analog DMT data from 0 hz to 11.04 Mhz in the band is received through a twisted pair line, the gain of the analog DMT data is amplified. It transmits to the analog front end 220, and removes surge noise and other noise input from the twisted pair line through the high voltage protection unit and the low band filter. At this time, the reason for amplifying the analog DMT data is because the gain of the analog DMT data modulated by the analog front end unit 220 is too small.

In addition, when the VDSL DSP controller 240 receives the up / down data change request signal from the host controller 400, the VDSL DSP controller outputs an up / down data control signal for controlling a transmission rate of up / down data. While transmitting to 210, the analog front end 220 is serially interfaced to control gain and transmission power of the filter in the analog front end 220.

The device controller 300 checks the status of each board, checking the user usage, and checking a board connection state when the host controller 400 receives a request for checking a board state, a user's use confirmation and a board connection state from the host controller 400. Afterwards, the corresponding result is transmitted back to the host controller 400, and a driving or synchronous clock is supplied to the plurality of VDSL processing units 200 and each board.

In addition, the host controller 400 transmits an up / down data change request signal to the plurality of VDSL processing units 200, while the device controller 300 transmits an up / down data change request signal to the device controller 300. After requesting a check and receiving a corresponding result from the device controller 300 again, it serves to display to the operator.

The external interface 500 connects an external debugging device and the host controller 400 to monitor board debugging and board status.

Next, an operation of the 8-port VDSL subscriber interface device having the above configuration will be described with reference to FIGS. 1 and 2.

First, an operation process provided to a subscriber by receiving ATM cell data input through an upper Internet server or a video server will be described. First, the ATM cell bus interface unit 100 establishes a cell bus from an upper Internet server or a video server. The demultiplexed ATM cell data is received and multiplexed and transmitted to the VDSL processor 200. At this time, the multiplexing of ATM cell data means that the VPI / VCI of the ATM cell data received from the ATM cell bus interface unit 100 is read and transmitted to the corresponding VDSL DMT processor 210 in the VDSL processor 200. In addition, since the VPI / VCI of each ATM cell data is different, it is transmitted to each of the VDSL processing unit 200 in a multiplexed form.

Subsequently, the VDSL DMT processing unit 210 is connected to the ATM cell bus interface unit 100 at the utopia level 2, and when receiving the ATM data from the ATM cell bus interface unit 100, converts the ATM data into digital DMT data and forwards it. The error correction function is performed and transmitted to the analog front end unit 220.

Then, the analog front end unit 220 receives the digital DMT data from the VDSL DMT processing unit 210 and converts the analog DMT data through a D / A converter and transmits it through a band filter of 0 hz to 11.04 Mhz. After filtering the band, fast Fourier frequency modulation is performed through the FFT to transmit the filtered 0 hz to 11.04 Mhz in-band frequency modulated analog DMT data to the line driver line filter 230 at a speed of 52 Mb / p. At this time, since the transmission band is wide, the interference of the radio frequency is filtered out through the RFI remover and the tone detector.

Subsequently, the line driver line filter 230 amplifies the gain of the analog DMT data to 3 dB when receiving the frequency-modulated analog DMT data from 0 hz to 11.04 Mhz band from the analog front end unit 220 to a twisted pair line. Through the VDSL modem of the subscriber side. At this time, the surge voltage and other noise input from the twisted pair line are removed through the high voltage protection unit and the low band filter.

Meanwhile, the operation of receiving ATM cell data from the VDSL modem of the subscriber and transmitting it to the upper Internet server or the video server will be described. First, the line driver line filter 230 is 0 hz from the VDSL modem of the subscriber. ~ 11.04 Mhz When the frequency-modulated analog DMT data in the band is received through a twisted pair line, the gain of the analog DMT data is amplified and transmitted to the analog front end unit 220. At this time, the surge voltage and other noise input from the twisted pair line are removed through the high voltage protection unit and the low band filter.

Then, when the analog front end unit 220 receives analog DMT data of 0 hz to 11.04 Mhz from the line driver line filter 230, demodulates the frequency D modulated analog DMT data in the band of 0 hz to 11.04 Mhz through IFFT. After converting the data into digital DMT data through the A / D converter, the VDSL DMT processor 210 transmits the digital DMT data. At this time, the interference of the radio frequency is filtered out through the RFI remover and the tone detector.

At this time, the VDSL DMT processor 210 receives the digital DMT data from the analog front end unit 220, converts the digital DMT data into ATM data, and transmits the same to the ATM cell bus interface unit 100. At this time, the VDSL DMT processing unit 210 must receive a transmission signal in order to transmit ATM data to the analog front end unit 220, the control is provided from the ATM cell bus interface 100.

When the ATM cell bus interface unit 100 receives the multiplexed ATM cell data from the VDSL DMT processing unit 210 in the VDSL processing unit 200, the ATM cell bus interface unit 100 demultiplexes and transmits the multiplexed ATM cell data to the upper Internet server or the video server through the cell bus.

At this time, when the VDSL DSP controller 240 receives the up / down data change request signal from the host controller 400, the VDSL DSP controller transmits an up / down data control signal for controlling a transmission rate of up / down data. While transmitting to the processor 210, the analog front end 220 is serially interfaced to control gain and transmission power of the filter in the analog front end 220.

In addition, the device controller 300 checks the state of each board, the user use check, and the board connection state when the host controller 400 is requested to check the state of the board, the user's use check and the board connection state. Afterwards, the corresponding result is transmitted back to the host controller 400, and a driving or synchronous clock is supplied to the plurality of VDSL processing units 200 and each board.

In addition, the host controller 400 transmits an up / down data change request signal to the plurality of VDSL processing units 200, and transmits an up / down data change request signal to the device controller 300. After requesting a check and receiving a corresponding result from the device controller 300 again, the operator displays it.

In addition, the external interface unit 500 connects an external debugging device and the host controller 400 to monitor board debugging and board status.

As described above, according to the 8-port VDSL subscriber interface device according to the present invention, by accommodating a plurality of subscribers in the DSLAM installed in the telephone station, it is possible to supply VDSL services at low cost, thereby real-time video conferencing, telemedicine, and There is an outstanding effect that commercialization such as live streaming of the Internet becomes possible.

Claims (4)

An ATM cell bus interface unit for multiplexing and transmitting demultiplexed ATM cell data through a cell bus from an upper server, and demultiplexing and transmitting the multiplexed ATM cell data to a higher server; When the multiplexed ATM data is received from the ATM cell bus interface unit, it is converted into VDSL in-band frequency modulated analog DMT data and transmitted to the subscriber side through a twisted pair line, while the VDSL in-band frequency modulated analog DMT is transmitted from the subscriber side. A plurality of VDSL processing units for converting the data into ATM data when receiving the data and transmitting the data to the ATM cell bus interface unit and adjusting the transmission rate of the up / down data when receiving an up / down data change request signal; A device controller which checks the status of each board, checks the use of the user, and checks the status of the board connection, and transmits the corresponding result again when requested to check the status of the board, the user's use and the board connection; The device transmits an up / down data change request signal to the plurality of VDSL processing units, requests the device controller to check a board state, a user usage check, and a board connection state, and inputs a corresponding result from the device controller. A host controller that displays the operator upon receipt; And An 8-port VDSL subscriber interface device comprising an external debugging device and an external interface for connecting the host controller for board debugging and board status monitoring. The method of claim 1, And the plurality of VDSL processing units are connected to the ATM cell bus interface unit in a utopia level 2 manner. The method of claim 1, The device controller further comprises a function of supplying a driving or synchronous clock to the plurality of VDSL processing units and each board. The method of claim 1, The VDSL processing unit is connected to the ATM cell bus interface unit at utopia level 2, and when receiving ATM data from the ATM cell bus interface unit, converts the digital data into digital DMT data, performs forward error correction, and transmits the digital data. A VDSL DMT processing unit for converting DMT data into ATM data and transmitting the same to the ATM cell bus interface unit and adjusting an up / down data transmission rate upon receiving an up / down data control signal; When receiving the digital DMT data from the VDSL DMT processing unit modulates and transmits the VDSL in-band frequency-modulated analog DMT data, while receiving the VDSL in-band frequency modulated analog DMT data is demodulated to the digital DMT data to the VDSL DMT processing unit An analog front end unit for transmitting; When receiving the VDSL in-band frequency modulated analog DMT data from the analog front end unit, the gain of the analog DMT data is amplified and transmitted to the subscriber through a twisted pair line, while the VDSL in-band frequency modulated analog is received from the subscriber side. A line driver line filter for receiving DMT data through a twisted pair line and amplifying the gain of the analog DMT data and transmitting the amplified gain to the analog front end; And When receiving the up / down data change request signal from the host controller, the up / down data control signal is transmitted to the VDSL DMT processing unit, and is serially interfaced with the analog front end unit so that the gain of the filter in the analog front end unit and An 8-port VDSL subscriber interface device comprising a VDSL DSP controller for controlling transmit power.