KR20000015183A - Electric saving type subscriber line interface apparatus of asymmetric digital subscriber line access multiplexer - Google Patents

Abstract

PURPOSE: A subscriber line interface apparatus is provided to detect whether each subscriber line is used and cut off power in a subscriber line which is not in service. CONSTITUTION: The apparatus comprises an analog treating part and an off-hook detecting part (10) for detecting whether a line matching part is in service, an off-hook interface and a switch controlling part (9) which receive a signal detected by the analog treating part and the off-hook detecting part and provide the signal to a power-down control part (15), and a control and digital signal treating part (5) which set the analog treating part and the off-hook detecting part, a DMT (discrete multi-tone) framer/interface part (4), and a DMT treating part (7) into a power down mode. Thereby, since the other device in the subscriber line interface apparatus which is connected with the subscriber line matching part is powered down responding to a power supplying state of the subscriber line matching part, the power is saved.

Description

Power-saving subscriber line interface device of asymmetric digital subscriber line network access device

The present invention relates to a Digital Subscriber Line Access Multiplexer (DSLAM) of an Asymmetric Digital Subscriber Line System (ADSL), and particularly to an off-hook in a subscriber line interface device of a DSLAM. The channel which does not perform the ADSL service by detecting a signal is related to a power-saving subscriber line interface device of an asymmetric digital subscriber line network access device configured to reduce power consumption by setting a power down mode.

In general, ADSL systems provide both telephone service and Video On Demand (VOD) over existing telephone lines, 1.5 Mbps (or 6 Mbps) in the direction from the telephone company to the user, from the user to the telephone company. In the up direction, the transmission speed between the down and the up direction is realized asymmetrically with a transmission rate of 16Kbps.

The DSLAM performs the function of connecting the asynchronous transfer mode (ATM) network with the ADSL system and the public switched telephone network.

Therefore, DSLAM converts ATM cells transmitted from ATM network into DMT (Discrete Multi-Tone) demodulation, converts them into DMT signals, interfaces these DMT signals for each ADSL line, and then transfers these DMT signals from the public switched telephone network. Multiplex the call signals and transmit them to the ADSL modem. DSLAM also demultiplexes ADSL data from ADSL modems into DMT and call signals. Thus, the call signal is transmitted to the public switched telephone network, and the DMT signal is transmitted to the subscriber line interface device.

The subscriber line interface device adopts a Discrete Multi-Tone (DMT) demodulation method and an ATM transmission method, which are one of MCM (Multicarrier Modulation) methods, and digital off by dial-up signaling. It is implemented to service up to 24 subscriber lines with one ADSL modem using digital off-hook technology.

However, this DSLAM subscriber line interface device is continuously powered even when ADSL service is not provided, which consumes a lot of power.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to detect whether or not each subscriber line is used in a subscriber line interface device of a DSLAM, and to turn down the power of a subscriber line that is not used. Power-saving subscriber line of an asymmetric digital subscriber line network connection device capable of reducing power consumption in the subscriber line interface device by DOWN and powering down the subscriber line interface device to which the subscriber line is connected according to the power down state of the subscriber line. An interface device is provided.

In order to achieve the above object, the power-saving subscriber line interface device of the asymmetric digital subscriber line network connection device according to the present invention,

An analog processor and an off hook detector for detecting whether the line matcher is performing a service;

An off hook interface and a switch controller for providing service state information of each line matching unit to a power down controller based on a service performance signal detected by the analog processor and the off hook detector;

A power down controller for controlling a corresponding device to be set to a power down mode in order according to state information of each line matching unit transmitted from the off hook interface and the switch controller;

According to an aspect of the present invention, the present invention includes an analog processor, an off hook detector, a DMT framer / interface unit, and a control and DSP unit for setting the DMT processor in a power down mode according to the control of the power down controller.

1 is a block diagram of a power-saving subscriber line interface device of a DSLAM according to the present invention;

FIG. 2 is a block diagram illustrating the power down controller of FIG. 1. FIG.

<Explanation of symbols for main parts of the drawings>

1: Cellbus interface unit 2: Multiplexing / demultiplexing unit

3: ATM handler 4: DMT framer / interface

5: Control and DSP section 6: Flash memory

7: DMT processing section 8: Switch section

9: off-hook interface and switch control unit

10: analog processing unit and off hook detection unit

11: Line driver / receiver 12: Hybrid converter

13: Separator

Hereinafter, the power-saving subscriber line interface device of the asymmetric digital subscriber line network connection device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a power-saving subscriber line interface device of a DSLAM according to the present invention.

As shown here, the cell bus interface unit 1 interfaces the cell bus and the subscriber multiplexer which multiplexes subscriber-specific data. The multiplexer / demultiplexer 2 demultiplexes the ATM data transmitted from the cell bus interface unit 1 for each subscriber and transmits the same to the ATM handler 3, and multiplexes data from the ATM handler 3 to the cell. Transfer to bus interface unit 1. The ATM handler 3 performs a bidirectional ATM interface for ADSL modems of various data rates. The DMT framer / interface unit 4 configures the data transmitted from the ATM handler 3 into an ADSL superframe and transmits the data to the DMT processor 7, and transmits the ADSL superframe transmitted from the DMT processor 7. Convert to ATM data.

The control and digital signal processing unit 5 interfaces with the central processing unit 14 to control the DMT framer / interface unit 4, the DMT processing unit 7, and the analog processing unit (AFE) 10, and controls the digital signal processing ( digital signal process) and sets the DMT framer / interface unit 4, the DMT processing unit 7, and the analog processing unit 10 to the power down mode under the control of the power down controller 15. . The flash memory 6 downloads and stores a program memory. The DMT processing unit 7 processes the ADSL superframe transmitted from the DMT framer / interface unit 4 to Discrete Multitone coprocess and transmits the signal to the analog processing unit 10, and transmits the signal transmitted from the analog processing unit 10 to the DMT framer / interface unit. Transfer to (4). The switch unit 8 switches the line matching unit 30 with respect to one line of the signal transmitted from the DMT processing unit 7. The off-hook interface and the switch control unit 9 detect the state of the subscriber line to control the switch unit 8, and transmit the off-hook signal detected by the analog processing unit and the off hook detection unit 10 to the power down mode control unit 15. To send).

The line matching unit 30 interfaces the signal switched by the switch unit 8 to the corresponding subscriber line. The POTS splitter 13 multiplexes the DMT signal transmitted from the line matching unit 30 and the call signal from the public switched telephone network to the ADSL modem.

The line matcher 30 includes an analog processor and an off hook detector 10, a line driver / receiver 11, and a hybrid converter 12. The analog processor and the off hook detector 10 convert the digital signal switched by the switch unit 8 into an analog signal and detect a digital hook off state of each line. The line driver / receiver 11 amplifies the analog signal transmitted from the analog signal processor and the off hook detector 10. The hybrid converter 12 converts the 4-wire signal transmitted from the line driver / receiver 11 into a 2-wire signal, and converts the 2-wire signal transmitted from the separator 13 into a 4-wire signal.

The central processing unit 14 controls each device of the power-saving subscriber line interface device of the DSLAM. The power down controller 15 controls power down of the corresponding device according to the collected line state information.

The general line interface operation of the power-saving subscriber line interface device of the DSLAM is described as follows.

First, when ATM cell data transmitted from an internet server or a video server is transmitted to the cell bus interface unit 1 through the subscriber multiplexing unit, the cell bus interface unit 1 multiplexes this ATM cell data. / To the demultiplexer (2). The multiplexer / demultiplexer 2 demultiplexes ATM cell data of four subscribers transmitted from the cell bus interface unit 1 for each subscriber and transmits it to the ATM handler 3.

The ATM handler 3 then performs header translation on the demultiplexed ATM cell data to separate Fast and Interleaved signals, and performs header error correction and scrambling, respectively. After that, it transmits to the DMT framer / interface unit 4. The DMT framer / interface section 4 is configured for bit stuffing / robbing according to the control of the control section and the DSP section 5 so that the data transmitted from the ATM handler 3 can form an ADSL frame. And elastic store operation. Therefore, when the ADSL frame and the ADSL superframe are configured, CRC, Forward Error Correction, and Interleaving are performed, and then the data is transmitted to the DMT processor 7.

Then, the DMT processor 7 transmits the ADSL superframe transmitted from the DMT framer / interface unit 4 to the switch unit 8 by performing Quadrature Amplitude Modulation (QAM), Inverse Fast Fourier Transform (IFFT), and Digital Filter functions. do. The switch unit 8 then switches six line matching units per line of data signal from the DMT processing unit 7 under the control of the off hook interface and the switch control unit 9. Thus, the digital signal switched to the analog processor and the off hook detector 10 of the line matching unit 30 is converted into an analog signal, and then 99 Khz high pass filtering and 4 Mhz low pass filtering are performed.

The line driver / receiver 11 amplifies and transmits the analog signal transmitted from the analog processor and the off hook detector 10 to the hybrid converter 12 to transmit the twisted pair line.

Then, the hybrid converter 12 converts the 4-wire signal transmitted from the line driver / receiver 11 into a 2-wire signal and transmits the 2-wire signal to the splitter 13. The separator 13 performs frequency division multiplexing on the call signal from the public switched telephone network and the DMT signal from the hybrid converter 12, converts the signal into an ADSL signal, and transmits the signal to the ADSL modem. In this way, the line interface is implemented so that the ATM cell from the video server is transmitted to the subscriber.

The power-saving subscriber line interface device of the DSLAM is powered and operated when it is in use, but according to the present invention, the device or the subscriber line interface device is operated in a power-down mode when the service is not performed, thereby allowing the subscriber line interface to operate. Try to reduce the power consumption of the device.

The power down control unit 15 is provided to reduce the power consumption.

As shown in FIG. 2, the power down control unit 15 includes line state information and a control unit 40 for collecting line state information and controlling power down according to the state; And a power down control interface unit 41 for generating a power down control signal according to the line state information and the control of the controller 40.

The control and DSP unit 5, by the power down control signal generated by the power down control interface unit 41 of the power down control unit 15, the DMT framer / interface unit 4, the DMT processing unit ( 7) a control clock controller 42 for controlling generation of a control clock for controlling the analog processor and the off hook detector 10; Under the control of the control clock control unit 42, the generation of the clocks required for the DMT framer / interface unit 4, the DMT processing unit 7, the analog processing unit, and the off-hook detection unit 10 are stopped and the power down mode is turned off. The clock signal generator 43 is set.

The off hook interface and the switch control unit 9, the off hook and line state information interface unit for transmitting the off hook and line status signals detected by the analog processing unit and the off hook detection unit 10 to the power down control unit 15. And 44.

The power saving operation of the power saving subscriber line interface device of the DSLAM is as follows.

First, the analog processor and the off hook detector 10 detect a digital off hook from each line and transmit the digital off hook to the off hook interface and the switch controller 9. Then, the off-hook interface and the switch control unit 9 connect the off-hook detected line to the network, and when the subscriber line is not in use, the protocol session is kept live but the physical connection is idle. transition to idle). When a service request is received, it becomes active immediately.If there is no traffic for a certain period of time even if it is in use, when it transitions to an idle state or switches to service another line, the power down controller Report to (15). This provides information so that devices that do not service can be set to power-down mode.

The line state information of the power down control unit 15 and the control unit 40 collects information such as service state, idle state, and other operation state of each line from the off hook and line state information interface unit 44. When information on the subscriber line not being used is transmitted from the line state information interface unit 44, the power down control interface unit 41 instructs generation of a power down control signal.

Accordingly, the power down control interface 41 is controlled and controlled by the line state information and the control unit 40, and the control clock control unit 42 of the DSP unit 5, which is not in service of the subscriber line, that is, the analog processing unit and off. The hook detector 10 generates a power down control signal to operate in a power down mode. Then, the control clock controller 42 stops the generation of the clock and the control clock required by the analog processor and the off hook detector 10 and sets the power down mode. At this time, the analog processing unit and the off-hook detection unit 10 set to the power-down mode are stopped except for the off-hook detection function.

If 6 line matching units are accommodated in one DMT processing unit, and all 6 line matching units connected to the DMT processing unit 7 operate in the power down mode, the power down control unit 15 may control the ATM handler 3 and the DMT framer / interface. The unit 4, the control and DSP unit 5, and the DMT processing unit 7 are all set to the power down mode.

When each device is operated in the power down mode in this manner, and all 24 line matching units operate in the power down mode, the power down control unit 15 is the cellbus interface unit 1 and the multiplexing / demultiplexing unit ( 2) also set to operate in power-down mode. Thus, when the service is not being performed, by operating in the power down mode, the power consumption of the subscriber line interface device can be reduced.

As described above, the DSLAM power-saving subscriber line interface device according to the present invention detects whether each subscriber line is used or not, and powers down the subscriber line matching unit that is not in use, thereby reducing the subscriber line matching unit. According to the power-down state, other devices in the subscriber line interface device to which the subscriber line matching unit is connected are sequentially powered down, thereby reducing the power consumption of the subscriber line interface device.

Claims (5)

A subscriber line interface device of a network access device in an asymmetric digital subscriber line system, An analog processor and an off hook detector for detecting whether the line matcher is performing a service; An off hook interface and a switch controller for providing service state information of each line matching unit to a power down controller based on a service performance signal detected by the analog processor and the off hook detector; A power down controller for controlling a corresponding device to be set to a power down mode in order according to state information of each line matching unit transmitted from the off hook interface and the switch controller; Power saving of the asymmetric digital subscriber line network connection device comprising an analog processing unit, an off hook detection unit, a DMT framer / interface unit, and a control unit and a DSP unit for setting the DMT processing unit to a power down mode under the control of the power down controller. Subscriber line interface device. The method of claim 1, wherein the power down control unit, When the service state information of the line matching unit collected from the off-hook interface and the switch control unit indicates that the line matching unit is in an idle state, a control signal is generated to set the line matching unit to the power down mode, and all the lines connected to the DMT processing unit When the matching unit is operated in the power down mode, a control signal is generated to set the corresponding DMT processing unit, the control unit, and the DSP unit and the DMT framer / interface unit in the power down mode, and all line matching units of the subscriber line interface device connected to one ADSL modem are When operating in the power down mode, the cell-bus interface bus, multiplexing / demultiplexing unit generates a control signal to be set to the power down mode, the power-saving subscriber line interface device of the asymmetric digital subscriber line network connection device. The method of claim 1, wherein the off-hook interface and the switch control unit, Power saving subscriber of the asymmetric digital subscriber line network connection device comprising an off hook and line state information interface for transmitting the off hook and line service status signals detected by the analog processor and the off hook detector to the power down controller. Line interface device. The power down control unit of claim 1 or 2, Line state information and a control unit which collects line state information from the analog processor and the off hook detector, and controls power down according to the state; And a power down control interface unit configured to generate a power down control signal according to the line state information and the control of the controller. The method of claim 1, wherein the control and DSP unit, A control clock control unit controlling generation of a control clock for controlling the DMT framer / interface unit, the DMT processing unit, the analog processing unit, and the off hook detection unit by the power down control signal generated by the power down control interface unit of the power down control unit; ; And a clock signal generator configured to stop generation of a clock necessary for the DMT framer / interface unit, the DMT processor, the analog processor, and the off hook detector according to the control of the control clock controller and set the power down mode. A power-saving subscriber line interface device of an asymmetric digital subscriber line network connection device.