KR20000003027A - Device for controlling re-operation of asymmetric digital subscriber line system - Google Patents

Abstract

PURPOSE: A device for controlling a re-operation of an asymmetric digital subscriber line system is provided to selectively enable a manual re-operation of a whole system, an automatic re-operation of a whole system, a re-operation of each line, and a re-operation of a certain hardware block. CONSTITUTION: A device for controlling a re-operation of an asymmetric digital subscriber line system comprises: a manual re-operation unit(16a) of the whole generating a re-operation signal of the whole; a cell bus interfacing unit(1) receiving ATM cell data from an internet server or a video server through a cell bus for transferring to an ATM multiplex/reverse multiplex unit(2); and the ATM multiplex/reverse multiplex unit multiplying ATM data of four subscribers from an ATM handler for transferring to the cell bus interfacing unit.

Description

Reactivation Control System of Asymmetric Digital Subscriber Line System

The present invention relates to reactivation control of an Asymmetric Digital Subscriber Line System (ADSL System), in particular, manual reactivation of the entire system, automatic reactivation, reactivation of each line only, and rework of some hardware blocks. A reoperation control device for an asymmetric subscriber line system in which operation is selectively enabled.

In general, an asymmetric digital subscriber line system is a system that enables not only telephone service but also video-on-demand (VOD), data, and the Internet using a telephone line installed as a transmission medium.

This asymmetric digital subscriber line system adopts Discrete Multi-Tone (DMT) modulation and ATM transmission, which is one of MCM (Multi-Carrier Modulation) methods, and digital off-hook (Dial Up) signaling. Off-hook technology is implemented to service up to 24 subscriber lines with modem devices.

In such an asymmetric digital subscriber line system, if some of the 24 channels malfunction or some hardware block malfunctions, the entire system or the hardware block to which the six line matching units are conventionally reactivated.

That is, even if a malfunction occurs in one line of 24 channels or a malfunction occurs in a hardware block of any part, the whole system is restarted, which affects the entire system and causes the service of the service channel to be interrupted. .

Accordingly, the present invention has been proposed to solve various problems occurring during the reoperation of the conventional asymmetric digital subscriber line system.

It is an object of the present invention to provide a reactivation control apparatus for an asymmetric subscriber line system in which manual reactivation of the entire system, automatic reactivation, reactivation of each line only, and reactivation of some hardware blocks are selectively possible.

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

Asymmetric digital subscriber line consisting of cell bus interface, ATM multiple / demultiplexer, ATM handler, framer / interface, control and digital signal processing, DMT processing, off hook interface and switch control, AFE and off hook detection and control In the system,

A reactivation control signal connected to the control unit and outputting a manual reactivation of the entire system, an automatic reactivation, a reactivation of each line only, and a reactivation of some hardware blocks according to the reactivation control signal outputted from the control unit. Buses connected to the cell bus interface unit, ATM multiplex / demultiplexer, ATM handler, framer / interface unit, control and digital signal processing unit, DMT processing unit, off hook interface and switch control unit, AFE and off hook detection unit, respectively. And a reoperation control unit for outputting.

In the above description, the reactivation control unit includes: a manual full reactivation unit for receiving a signal input by an administrator to reactivate the entire device arbitrarily and generating a manual full reactivation signal;

An automatic total reactivation unit for generating a signal for automatically reactivating the entire apparatus according to the control signal generated by the control unit;

A system monitoring and control unit for monitoring the entire operation of the system and generating a system-wide reactivation or a partial system reactivation signal according to a state signal of each block;

And a partial reactivation signal interface unit for generating a reactivation control signal for reactivating only the corresponding block according to a partial reactivation signal output from the automatic whole reactivation unit or the system monitoring / control unit.

1 is a block diagram of an asymmetric digital subscriber line system according to the present invention;

FIG. 2 is a detailed block diagram of the reoperation control unit in FIG. 1; FIG.

<Explanation of symbols for main parts of the drawings>

5: control and digital signal processing unit 14: control unit

16: reactivation control unit 16a: manual full reactivation unit

16b: automatic full reactivation unit 16c: system operation monitoring and control unit

16d: partial reactivation interface

Hereinafter, with reference to the accompanying drawings, preferred embodiments according to the spirit of the present invention as described above in detail as follows.

1 is a block diagram of an asymmetric digital subscriber line system to which the present invention is applied.

As shown therein, the DMT and the control unit 100, the line matching unit 200, and the POTS splitter 300.

Here, the DMT and control unit 100 includes a cell bus interface unit 1, an ATM multiplexing / demultiplexing unit 2, an ATM handler 3, a DMT framer / interface unit 4, control and digital Signal processor 5, flash memory 6, DMT processor 7, switching unit 8, off-hook interface and switch controller 9, controller (CPU) 14, power The down control part 15 and the reoperation control part 16 are comprised.

The line matching unit 200 includes an AFE and off-hook detection unit 10, a line driver / receiver 11, and a hybrid conversion unit 12.

In addition, the reactivation control unit 16, as shown in Figure 2, the manual full reactivation unit (16a) for receiving a signal input by the administrator arbitrarily to reactivate the entire device to generate a manual total reactivation signal; An automatic total reactivation unit (16b) for generating a signal for automatically reactivating the entire apparatus according to the control signal generated by the control unit (14); A system monitoring and control unit (16c) for monitoring the entire system operation and generating a system-wide reactivation or a partial system reactivation signal in accordance with the status signal of each block; Partial reactivation signal interface unit 16d for generating a reactivation control signal for reactivating only the corresponding block according to a partial system reactivation signal output from the automatic full reactivation unit 16b or the system monitoring / control unit 16c. It is composed.

Referring to the operation of the asymmetric digital subscriber line system to which the present invention configured as described above is applied as follows.

First, the cell bus interface unit 1 interfaces with a subscriber multiplexer and a cell bus, and receives ATM cell data from an upper Internet server or video server through a cell bus to provide an ATM multiplexer / demultiplexer ( 2) to pass.

The ATM multiplexer / demultiplexer 2 demultiplexes the ATM data coming from the cell bus interface unit 1 or multiplexes the ATM data coming from the ATM handler 3 and quadruple subscribers from the cell bus interface unit 1. ATM multiplexed signals are demultiplexed and transmitted to four ATM handlers. ATM data of four subscribers from the ATM handler is multiplexed and transmitted to the cell bus interface unit 1.

The ATM handler 3 supports a bidirectional ATM interface for ADSL modems of various data rates, and analyzes headers from data from the ATM multiplexer / demultiplexer 2 to interleave fast signals with interleaved data. The signal is separated and transmitted to the DMT framer / interface unit 4 by performing head error correction and scrambling. In addition, the fast data and interleaved data signals from the DMT framer / interface unit 4 are respectively received to perform cell delineation, descrambling, header analysis, etc. to multiplex the fast data and the interleaved data. Transfer to the ATM multiplexer / demultiplexer (2).

In addition, the DMT framer / interface unit 4 may interface with the ATM handler 3, configure an ADSL superframe, and receive data from the ATM handler 3 to configure an ADSL frame. It performs bit stuffing / robbing and elastic storage so as to configure an ADSL frame and an ADSL superframe, and then performs CRC, forward error correction, interleaving, etc., and transmits them to the DMT processing unit 7. 7) It receives the data signal from and performs the reverse function.

In addition, the control and digital signal processing unit 5 interfaces with the control unit 14, which is a central processing unit, controls the DMT framer / interface unit 4, the DMT processing unit 7, and the analog front end unit to process digital signals. Perform the function. That is, the DMT framer / interface unit 4, the DMT processing unit 7, and the analog front end unit are controlled by the control of the control unit 14 while interfacing with the control unit 14 as an operating entity and communicating in a message protocol format. The digital signal processing function removes the data echo of the front-end part, receives the power-down signal of the power-down control unit 15, and receives the DMT framer / interface unit 4, the DMT processing unit 7, the APE, and the off-hook detection unit 10. ) To power down mode.

The flash memory 6 downloads and stores a program memory, and downloads and stores an instruction opcode and a data value from the program memory of the controller 14 clock.

In addition, the DMT processing unit 7 receives an ADSL superframe signal from the DMT framer / interface unit 4 and performs a quadrature amplitude modulation (QAM) and inverse fast fourier transform (IFFT) digital filter function to perform an analog front end part. Transmits to the off-hook interface and the switch controller 9, and receives a data signal from the off-hook interface and the switch controller 9 to perform a digital filter, fast fourier transform (FFT), and QAM demodulation function to perform the DMT framer / To the interface unit 4.

In addition, the switching unit 8 is an N * M switch unit for switching the line matching unit 200, and for each line of data signal coming from the DMT processing unit 7 by the off-hook interface and the control of the switch control unit 9. The six line matching units 200 are switched.

In addition, the off-hook interface and switch control unit 9 which detects the state of the subscriber line and controls the switching unit 8 can be digitally turned off when the subscriber wants to connect, i.e. by dial-up signaling from a remote ADSL modem. When a hook is detected, the corresponding subscriber line is connected to the network. When the subscriber line is not used, the protocol session is kept live, but the physical connection is idle, and the service is immediately activated when a service request comes in. Switch. In addition, even when in use, when there is no traffic for a certain period of time, it switches back to the idle state or switches to service another line, and also reports the state of each line to the controller 14 and powers down a block that does not perform service. It provides information so that you can do it.

In addition, the AFE and off-hook detection unit 9, which converts a DMT digital signal into an analog signal and detects a digital off-hook state of each line, converts the DMT signal from the DMT processing unit 7 into an analog signal. After the conversion, 99khz low pass filtering and 4Mhz high pass filtering are performed to the line driver / receiver 11, and the analog DMT signal from the line driver / receiver 11 is low-pass filtered and then converted into a digital signal for the switching unit 8 ), Digital off-hook is detected from each line, and transmitted to the off-hook interface and the switch control unit 9, and the function operation except for off-hook detection is stopped in the power-down mode.

In addition, the line driver / receiver 11, which amplifies the signal for transmission over a twisted pair line, amplifies and transmits the analog DMT signal from the analog front end to the hybrid converter 12, and the hybrid converter 12 Receives an analog DMT signal from) and performs 99khz low pass filtering and 34khz low pass filtering to the DMT processing unit 7.

In addition, the hybrid converter 12 performs a function of converting 4 wires into 2 wires. That is, a function of converting a 4-wire signal coming from the line driver / receiver 11 into a 2-wire signal, and converting a 2-wire signal coming from the POTS splitter 300 into a 4-wire signal and transmitting it to the line driver / receiver 11. It also performs line impedance matching function.

The POTS splitter 300 performs a function of multiplexing a DMT signal and a plain old service (POTS) signal. That is, the ADSL signal obtained by frequency division multiplexing the DMT signal from the hybrid converter 12 and the analog telephone signal from the public switched telephone network (PSTN) is transmitted to the ADSL modem. The signal is received, the DMT signal is separated from the POTS signal, and the DMT signal is transmitted to the hybrid converter 12, and the POTS signal is transmitted to the public telephone network switch.

In addition, the control unit 14, which is a central processing unit, performs a function of controlling the entire system. That is, it initializes and controls each line, monitors status and manages status information, and functions to interface with the operation unit of the network.

In addition, the power down control unit 15 provides a power down function of hardware which is not used depending on the state of the line. That is, the ATM handler 3 is set to the power-down mode according to the state information of the line collected by the off-hook interface and the switch control unit 9, and the DMT framer / interface is passed through the control and digital signal processing unit 5. The unit 4, the DMT processor 7, the APE and the off-hook detector 10 are operated in a power down mode.

In addition, the reoperation control unit 16 is a block for reactivation in the case of a malfunction, and monitors the operation state from each block to automatically reactivate the malfunction occurrence block or to automatically reactivate the whole when the control unit 14 malfunctions. It performs the function of unilaterally reactivating the whole as needed by the administrator.

Hereinafter, the operation of the reactivation control unit 16 will be described in more detail.

The reactivation control unit 16 includes a manual full reactivation unit 16a which receives a signal input by an administrator to reactivate the entire device arbitrarily as shown in FIG. 2 and generates a manual total reactivation signal; An automatic total reactivation unit (16b) for generating a signal for automatically reactivating the entire apparatus according to the control signal generated by the control unit (14); A system monitoring and control unit (16c) for monitoring the entire system operation and generating a system-wide reactivation or a partial system reactivation signal in accordance with the status signal of each block; Partial reactivation signal interface unit 16d for generating a reactivation control signal for reactivating only the corresponding block according to a partial system reactivation signal output from the automatic full reactivation unit 16b or the system monitoring / control unit 16c. It is composed.

The reactivation control unit 16 configured as described above first inputs a corresponding signal in order for the administrator to reactivate the entire system forcibly upon board mounting or other needs, and the manual reactivation unit 16a performs the system according to the signal. Generates a control signal for forcibly reactivating the whole.

In addition, the automatic full reactivation unit 16b generates a control signal for automatically reactivating the system when a malfunction of the control unit 14 is detected or a total reactivation is required. If the manual full reactivation signal is generated in 16a), the manual full reactivation is controlled in preference to the automatic reactivation signal.

In addition, the system monitoring and control unit 16c monitors the entire system operation, and if a malfunction occurs during the monitoring of the operating state of the control unit 14, automatically generates a control signal for reactivating the entire system. In addition, if a malfunction occurs in some blocks, a partial reactivation control signal for reactivating only some blocks is generated.

Accordingly, the partial reactivation signal interface unit 16d interfaces the system partial reoperation control signal generated by the system monitoring and control unit 16c, and transfers the control signal to the corresponding block that is malfunctioning, so that only the partial reactivation is performed. To be done.

As described above, the present invention has the effect of selectively reactivating the entire system when the administrator wants to reactivate the entire system manually or when the automatic reactivation is desired.

In addition, if a malfunction occurs only in some blocks during the monitoring of the system, only some blocks that cause the malfunction may be reactivated.

In addition, since a block which normally performs a service by reoperation of only a part of the system is not affected by the reoperation, there is an advantage that the service can be continuously performed.

Claims (2)

Asymmetric digital subscriber line consisting of cell bus interface, ATM multiple / demultiplexer, ATM handler, framer / interface, control and digital signal processing, DMT processing, off-hook interface and switch control, AFE and off-hook detection, and control In the system, A reactivation control signal connected to the control unit and outputting a manual reactivation of the entire system, an automatic reactivation, a reactivation of each line only, and a reactivation of some hardware blocks according to the reactivation control signal outputted from the control unit. A bus connected to the cell bus interface unit, ATM multiplex / demultiplexer, ATM handler, framer / interface unit, control and digital signal processing unit, DMT processing unit, off-hook interface and switch control unit, AFE and off-hook detection unit, respectively. Reactivation control device of the asymmetric digital subscriber line system comprising a reactivation control unit for outputting. The method of claim 1, wherein the reactivation control unit, A manual full reactivation unit for receiving a signal input by an administrator to reactivate the entire device arbitrarily and generating a manual full reactivation signal; An automatic total reactivation unit for generating a signal for automatically reactivating the entire apparatus according to the control signal generated by the control unit; A system monitoring and control unit for monitoring the entire operation of the system and generating a system-wide reactivation or a partial system reactivation signal according to a state signal of each block; A partial reactivation signal interface unit for generating a reactivation control signal for reactivating only the block in accordance with the partial reactivation signal output from the automatic whole reactivation unit or the system monitoring / control unit of the asymmetric subscriber line system Reaction Control.