KR20020052033A - 16 port asymmetric digital subscriber line interface device - Google Patents

Abstract

PURPOSE: A 16 ports asymmetric digital subscriber interface apparatus is provided to increase the number of subscriber's line in an area compared to the existing 8 ports asymmetric digital subscriber interface apparatus, thereby reducing the cost by a line. CONSTITUTION: An ATM mux and cell bus interface unit(100) receives the multiplexed 16 channel ATM cell data from the upper Internet or a video server and then inverse multiplexes the data and also, when receiving the inverse multiplexed 16 channel ATM cell data, multiplxes the cell data and then transmits the data to the server. When inputting 4 channel ATM cell data from the ATM mux and cell bus interface unit(100), a universal digital interface unit(200) converts the data into DMT signal of ADSL super-frame adapting to the universal ADSL standard and performs various filtering functions and error correction functions. When inputting the DMT(Discrete Multi-Tone) signal, a 16 channel analog front end unit(300) converts the signal into an analog signal and when inputting an analog signal, converts the signal into a digital DMT signal, respectively, and thereafter transmits to the corresponding digital interface unit. When inputting an analog DMT signal, a 16 channel line driver/receiver unit(400) amplifies and transmits the signal and also, when inputting an analog DMT signal, filters the signal and thereafter transmits the signal to the corresponding analog front-end unit. When inputting 4-wire analog DMT signal, a 16 channel hybrid transformation unit(500) transforms the signal into 2-wire signal and then transmits the signal to the corresponding line driver/receiver unit and vice versa. A CPU(600) performs the whole control function of each block. A 4 channel ADSL transceiver(700) controls the operations of one universal digital interface unit and 4 channel analog front end unit under the control of the CPU(600).

Description

16 PORT ASYMMETRIC DIGITAL SUBSCRIBER LINE INTERFACE DEVICE}

The present invention relates to a 16-port asymmetric digital subscriber interface (Asymmetric Digital Subscriber Interface) device, more specifically, an ATM (Asynchronous Transfer Mode; referred to as "ATM") Cell Bus Interface (Cell Bus Interface) unit And ATM Interface / Framer, Discrete Multi-Tone (DMT) processor, and flash memory while integrating ATM Mux / Demux sections. By integrating (Flash Memory) into two functional units and replacing the Hybrid Transformer with a Chip Type, 16-port design is possible by utilizing the remaining space on the board. A port asymmetric digital subscriber interface device.

A conventional eight-port asymmetric digital subscriber interface device, as shown in FIG. 1, includes: a cell bus interface unit 1 for accommodating eight subscriber lines and simultaneously performing a cell bus interface of ATM cell data; An ATM mux / demux unit (2) for accommodating eight subscriber lines and performing a multiplexing / demultiplexing function of ATM data; An eight-channel ATM interface / framer DMT processor for accommodating one subscriber line and performing an ASL (Asymmetric Digital Subscriber Line (ADSL)) frame conversion function and DMT processing function of ATM cell data (3) ); An eight-channel analog front-end unit 4 for converting a DMT digital signal into an analog signal and simultaneously converting an analog DMT signal into a digital signal; An eight-channel line driver / receiver unit 5 for amplifying and outputting a DMT signal; An eight-channel hybrid transformer 6 for performing a wire conversion operation of the DMT signal; A central process unit (hereinafter referred to as "CPU") 7 for controlling the operation of all the above-described blocks 1, 2, 3, 4, 5, 6; A flash memory 8 for downloading and storing a program memory of the CPU 7; The board state and line state for all the blocks 1, 2, 3, 4, 5, and 6 described above, the alarms of various power sources, and the state of hermetic stripping of the splitter board are checked and the resultant values are read. 7) an alarm signal processor 9 for transmitting; And under the control of the CPU 7, the board state and line state for all the blocks 1, 2, 3, 4, 5, and 6 described above, alarms of various power supplies, and whether the splitter board is dismounted. It consisted of board state display part (10).

However, since the conventional 8-port asymmetric digital subscriber interface device can only accommodate up to 8 subscriber lines, not only is it less efficient in terms of installation area and price per line, but also has disadvantages in terms of competitiveness and cost reduction with other companies. .

In addition, another problem of the conventional 8-port asymmetric digital subscriber interface device described above is that the ATM cell bus interface unit does not support the Utopia Level-2 standard, and thus, the ATM cell bus interface unit and the ATM mux / d. Due to the separation of the mux part, not only is it inefficient in terms of space and price, but also has a problem in that the density per board is limited due to the size and height of the hybrid transformer.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the cost per line by increasing the number of subscriber lines to area compared to the conventional 8-port asymmetric digital subscriber interface board and at the same time with other companies. To provide a 16-port asymmetric digital subscriber interface device, which is advantageous in terms of price competitiveness and low royalties.

In order to achieve the above object, the 16-port asymmetric digital subscriber interface device of the present invention receives the multiplexed 16-channel ATM cell data from a higher-level Internet or video server and then demultiplexes it, while de-multiplexed 16-channel ATM cell data. ATM mux and Cellbus interface unit for multiplexing the received and transmitted to the server;

Receiving four channels of ATM cell data from the ATM mux and the Cellbus interface unit converts the DMT signal of the ADSL super frame conforming to the universal ADSL standard and performs various filtering and error correction functions. A four-channel universal digital interface configured to perform the inverse function described above and receive the four-channel DMT signal and transmit them to the ATM mux and cellbus interface;

A 16-channel analog front-end unit for converting each DTM signal from the universal digital interface unit into an analog signal, converting the analog DMT signal into a digital DMT signal and transmitting the analog DMT signal to the corresponding universal digital interface unit;

A 16-channel line driver / receiver unit for amplifying and transmitting the analog DMT signal from the analog front-end unit, respectively, and filtering the received analog DMT signal and transmitting the filtered analog DMT signal to the analog front-end unit;

When 4-wire analog DMT signals are input from the corresponding line driver / receiver, they are converted to 2-wire signals, and when 2-wire signals are input, they are converted to 4-wire signals and transmitted to the corresponding line driver / receiver. 16-channel hybrid transformer unit;

A CPU performing overall control of each of the blocks; And

Under the control of the CPU is characterized by consisting of four channels ADSL transceiver for controlling the operation of one universal digital interface unit and four analog front-end unit, respectively.

1 is a functional block diagram showing the configuration of a conventional 8-port non-deching digital subscriber interface device;

2 is a functional block diagram showing the configuration of a 16-port asymmetric digital subscriber interface device according to an embodiment of the present invention.

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

100: ATM mux and Cellbus interface unit

200: universal digital interface 300: analog front-end

400: line driver / receiver section 500: hybrid transformer section

600: CPU 700: ADSL Transceiver

800: alarm signal processing unit 900: board status display unit

Hereinafter, a 16-port asymmetric digital subscriber interface device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a functional block diagram of a 16-port asymmetric digital subscriber interface device according to an embodiment of the present invention, the 16-port asymmetric digital subscriber interface device according to an embodiment of the present invention ATM ATM and Cellbus interface unit 100 , 4-channel Universal Digital Interface (200), 16-channel analog front-end unit (300), 16-channel line driver / receiver (400), 16-channel hybrid transformer (500) And a CPU 600, a four-channel ADSL transceiver 700, an alarm signal processing unit 800, and a board status display unit 900.

The ATM mux and cellbus interface unit 100 demultiplexes and receives four channels at the same time when the multiplexed 16-channel ATM cell data transmitted from a higher-level Internet or video server is received through an ATM cell bus. While transmitting to the mobile station 200 and receiving the demultiplexed 16-channel ATM cell data from the 4-channel universal digital interface unit 200, multiplexing the multi-channel ATM cell data and transmitting the multiplexed data to the Internet or video server through the ATM cell bus. It transmits to (Video Server).

In addition, the four-channel universal digital interface unit 200 interfaces with the ATM mux and Cellbus interface unit 100 according to the Utopia Level-2 interface standard and at the same time accommodates four channels of analog front-end unit 300. As an interface block, when receiving ATM cell data of four channels from the ATM mux and the Cellbus interface unit 100, the Transmission Convergence (TC) sub-layer function of the ATM physical layer is provided. And DMT of ADSL Super Frame conforming to G992.1 specification that supports ANSI1.2 or Splitterless ADSL. Performs forward error correction and various filtering / coding functions at the same time as converting the signal to the corresponding analog front-end unit 300. On the other hand, when receiving the four-channel DMT signal of the ADSL super frame from the analog front-end unit 300, respectively, performs the above-described reverse function to transmit the ATM mux and the cell bus interface unit 100. do.

In this case, the forward error correction function performed by the four-channel universal digital interface unit 200 includes cyclic redundancy (CRC) calculation, bit scrambling, and Reed-Solomon search byte encoding. Check byte encoding, and Convolutional Interleaving, and various filtering / coding functions include ANSI T1.413 Category 1 Quadrature Amlplitude Modulation (QAM) and Inverse Fast Fourier Tranform (IFFT) digital filtering. T1.413 Refers to the category 2 trellis coding and echo cancellation functions.

On the other hand, when the 16-channel analog front-end unit 300 receives one DTM signal from the corresponding universal digital interface unit 200, it performs low pass filtering and simultaneously converts the analog signal into a line connected thereto. When transmitting to the driver / receiver unit 400, and receiving an analog DMT signal from the line driver / receiver unit 400 connected thereto, it is converted into a digital DMT signal and then transmitted to the corresponding universal digital interface unit 200. Play a role.

In addition, when the 16-channel line driver / receiver unit 400 receives one analog DMT signal from the corresponding analog front-end unit 300, the amplified signal is amplified to a predetermined level and then connected to the hybrid transformer unit 500 connected thereto. On the other hand, when receiving the analog DMT signal from the hybrid transformer 500 connected to each, 99KHz low pass filtering and 34KHz high pass filtering (Performance) after performing the corresponding analog front-end 300 It serves to transmit.

On the other hand, the 16-channel hybrid transformer 500 receives a 4-wire analog DMT signal from the line driver / receiver 400 connected thereto, and then converts it into a 2-wire signal. While transmitting to a modem (not shown), when receiving a two-wire analog DMT signal from the modem, respectively, converts into a 4-wire analog DMT signal and transmits to the line driver / receiver unit 400. Do it.

In addition, the 16-channel hybrid transformer 500 is a surge voltage generated by directly connecting a telephone without a split old telephone service (POTS) in a remote terminal (POTS) splitter (Surge Voltage) It removes the high voltage such as).

Meanwhile, the CPU 600 includes an ATM mux and cellbus interface unit 100, a 4-channel universal digital interface unit 200, a 16-channel analog front-end unit 300, and a 16-channel line driver / receiver unit. And control all operations of the 400, the 16-channel hybrid transformer 500, and the 4-channel ADSL transceiver 700, while the alarm signal processing unit 800 controls the board state and line state alarm signals for each block. When receiving the control function to output the corresponding display control signal to the board status display unit 900.

In addition, the four-channel ADSL transceiver 700 receives a control signal from the CPU 600, one universal digital interface unit 200 and conforms to the ANSI T1.413 Issue1, 2 or G992.2 standard and It controls the operation of the four-channel analog front-end unit 300, respectively.

On the other hand, the alarm signal processing unit 800 checks the board state and line state for each block, the alarm of various power supply, and the state of hernia of the splitter board, and transmits the corresponding alarm signal to the CPU 600. Do it.

In addition, when the board status display unit 900 receives a board status and line status alarm signal for each block from the CPU 600, the board status display unit 900 displays a corresponding result value to the operator.

Next, an operation process of the 16-port asymmetric digital subscriber interface device having the above configuration will be described with reference to FIG. 2.

First, a description will be given of a forward operation process in which AMT cell data transmitted from an upper Internet or video server is transmitted to a subscriber through the present invention.

Initially, the ATM mux and cell bus interface unit 100 receives multiplexed 16-channel ATM cell data transmitted from a higher-level Internet or video server through an ATM cell bus, and then demultiplexes and distributes each of the four channels simultaneously. Each of the four channels is transmitted to the universal digital interface unit 200.

Then, the four-channel universal digital interface unit 200 receives four channels of ATM cell data from the ATM mux and cellbus interface unit 100, respectively, and then performs ANSI T1.413 Issue1, 2 or splitterless ADSL. The analog front-end unit 300 of the 16 channels after converting into a DMT signal of an ADSL super frame conforming to the supported G992.1 standard and performing a forward error correction function and various filtering / coding functions To each.

Subsequently, the 16-channel analog front-end unit 300 receives one DTM signal from the corresponding universal digital interface unit 200, performs low pass filtering, simultaneously converts the analog signal into an analog signal, and connects with itself. To the line driver / receiver unit 400, respectively.

Then, the 16-channel line driver / receiver unit 400 receives one analog DMT signal from the corresponding analog front-end unit 300, amplifies the signal to a predetermined level, and then connects the hybrid transformer unit connected to itself ( 500) respectively.

Subsequently, the 16-channel hybrid transformer 500 receives a 4-wire analog DMT signal from the line driver / receiver 400 connected thereto, converts the signal into a 2-wire signal, and simultaneously converts the modem into a 2-wire signal. Send to each subscriber through. In this case, the 16-channel hybrid transformer 500 removes a function of removing a high voltage such as a surge voltage generated by directly connecting a telephone to a remote terminal without a POTS splitter. Perform.

In the following description, a reverse operation process in which ATM cell data transmitted from a subscriber side is transmitted to a higher Internet or a video server through the present invention will be described.

First, the 16-channel hybrid transformer 500 receives a 2-wire analog DMT signal from the modem, converts it into a 4-wire analog DMT signal, and then connects the line driver / receiver unit 400 to itself. To send).

Then, the 16-channel line driver / receiver unit 400 receives analog DMT signals from the hybrid transformer 500 connected thereto and performs 99KHz low pass filtering and 34KHz high pass filtering, respectively, and then performs the corresponding analog. Transmit to front-end unit 300.

Subsequently, the 16-channel analog front-end unit 300 receives the analog DMT signal from the line driver / receiver unit 400 connected thereto and simultaneously converts the analog DMT signal into a digital DMT signal, and then converts the corresponding universal digital interface unit ( 200).

Then, the four-channel universal digital interface unit 200 receives the four-channel DMT signal of the ADSL super frame from the analog front-end unit 300, respectively, and performs a reverse function of the forward after the ATM mux and Transmission to the cell bus interface unit 100.

Subsequently, the ATM mux and cellbus interface unit 100 receives the demultiplexed 16-channel ATM cell data from the four-channel universal digital interface unit 200 and multiplexes it, and then multiplexes it through the ATM cell bus. Send to the internet or video server.

At this time, the CPU 600 is the ATM mux and CellBus interface unit 100, four channels of digital digital interface 200, 16 channels of analog front-end 300 in the forward or reverse ATM cell data processing , All the operations of the 16-channel line driver / receiver unit 400, the 16-channel hybrid transformer unit 500, and the 4-channel ADSL transceiver 700 are controlled. In addition, the four-channel ADSL transceiver 700 includes one universal digital interface unit 200 and four channels of analog front-end unit 300 under the control of the CPU 600 during forward or reverse ATM cell data processing. Control the operation of each.

As described above, according to the 16-port asymmetric digital subscriber interface device according to the present invention, the number of subscriber lines per area is increased compared to the conventional 8-port asymmetric digital subscriber interface board, thereby reducing the cost per line, and thus, This has the effect of being able to improve price competitiveness and lower royalty.

Claims (3)

An ATM mux and cellbus interface unit configured to demultiplex and receive multiplexed 16 channel ATM cell data from an upper Internet or video server, and to multiplex and receive the demultiplexed 16 channel ATM cell data to the server; Receiving four channels of ATM cell data from the ATM mux and the Cellbus interface unit converts the DMT signal of the ADSL super frame conforming to the universal ADSL standard and performs various filtering and error correction functions. A four-channel universal digital interface configured to perform the inverse function described above and receive the four-channel DMT signal and transmit them to the ATM mux and cellbus interface; A 16-channel analog front-end unit for converting each DTM signal from the universal digital interface unit into an analog signal, converting the analog DMT signal into a digital DMT signal and transmitting the analog DMT signal to the corresponding universal digital interface unit; A 16-channel line driver / receiver unit for amplifying and transmitting the analog DMT signal from the analog front-end unit, respectively, and filtering the received analog DMT signal and transmitting the filtered analog DMT signal to the analog front-end unit; When 4-wire analog DMT signals are input from the corresponding line driver / receiver, they are converted to 2-wire signals, and when 2-wire signals are input, they are converted to 4-wire signals and transmitted to the corresponding line driver / receiver. 16-channel hybrid transformer unit; A CPU performing overall control of each of the blocks; And 32-channel asymmetric digital subscriber interface device comprising four ADSL transceivers for controlling the operation of one universal digital interface unit and four channels of analog front-end unit under the control of the CPU. The method of claim 1, 32-port asymmetric digital subscriber interface device characterized in that the physical interface specification between the four-channel universal digital interface unit and the ATM mux and Cellbus interface unit is a utopia level-2 standard. The method of claim 1, The four-channel ADSL transceiver controls one universal digital interface unit and four analog front-end units in accordance with ANSI T1.413 Issue1, 2 or G.992.2 standard. Asymmetric Digital Subscriber Interface Device.