KR100880334B1 - ADSL modem apparatus and method of initiating the apparatus - Google Patents

Abstract

The present invention relates to an ADSL modem apparatus and an initialization method thereof, and more particularly, to an ADSL modem apparatus and a method of initializing the same using a DMT (Discrete Multi Tone) modulation / demodulation scheme including a network interface unit, a plurality of demodulation / demodulation units, At least one initialization unit capable of performing an initialization process for the number of input ports and controlling the initialization unit to perform an initialization process for a subscriber channel in response to a driving signal received from ADSL terminal apparatuses installed on a subscriber side, And an initialization scheduler for not performing two or more initialization processes at the same time. Upon receipt of a first drive signal of an ADSL terminal installed on the subscriber side, it is checked whether there is an initialization process being performed. If there is an initialization process Determines a priority of the first drive signal, and determines a priority of the first drive signal The initialization process for the subscriber channel corresponding to the first driving signal is performed at the starting point of the Nth step from the initialization step being performed when the Nth order is being performed, Demodulates the data received from the initialized subscriber channel and outputs the modulated or demodulated data to the outside.

ADSL modem, initialization, initialization schedule, subscriber channel

Description

ADSL modem apparatus and method of initiating the same

1 is a block diagram showing a structure of a general ADSL modem apparatus;

2 is a block diagram illustrating the structure of an ADSL modem apparatus according to an embodiment of the present invention;

3 is a diagram illustrating an initialization process of an ADSL modem according to an exemplary embodiment of the present invention.

4 is a view for explaining the operation of the initialization scheduler unit according to the embodiment of the present invention.

5A and 5B are flowcharts illustrating an operation when an initialization process is not performed on another channel based on the driving signal S ₁ according to the embodiment of the present invention.

6A is a flowchart illustrating an overall operation of an initialization scheduler unit according to an embodiment of the present invention.

6B to 6I are flowcharts of an initialization scheduler unit for each step of the initialization process according to an embodiment of the present invention.

The present invention relates to an asymmetric digital subscriber line (ADSL) modem apparatus, and more particularly to an ADSL modem apparatus and an initialization method thereof for reducing a processing power required for initializing a subscriber channel for providing an ADSL service will be.
In general, ADSL communication is used to enable high-speed digital communication of several megabits / second by using a conventional copper wire cable installed as a wire-based digital transmission method. The ADSL communication method used therefor is ANSI T1.413, etc. Standardized DMT (Discrete Multi Tone) modulation and demodulation method is used.
The DMT modulation and demodulation scheme has a strong immunity to noise by using a low symbol transmission rate compared to other modulation and demodulation schemes. However, since the frequency band to be used is cut in 4KHz units and composed of 256 channels, There is a disadvantage that a large amount of processing power is required.
Here, the processing power refers to a degree indicating the degree of MIPS (Million Instruction Per Second), that is, a degree indicating how much the operation can be performed within one second.

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The DMT modulation and demodulation scheme requires relatively more processing power than the other modulation and demodulation schemes can be found in the structure of the conventional ADSL modem apparatus implemented according to the DMT modulation and demodulation scheme shown in FIG. 1 and the initialization method thereof.
As shown in FIG. 1, the conventional ADSL modem apparatus includes a network interface 1 for processing a frame of an ADSL link layer with respect to voice, image or general data applied through a subscriber channel, a DMT modulation / An input / output interface unit 3 for inputting / outputting DSP processed data to / from an AFE (Analog Front End) device, and an initialization unit 21 and a modulation / demodulation unit 22 as an ADSL modem function, As shown in FIG.

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The provision of the DSP unit 2 for the number of subscriber channels corresponds to 1: 1 for each of the subscriber channels, and thus the initialization unit 22 also operates in a one-to-one correspondence with each of the subscriber channels.

However, the ADSL device requires an initialization process consisting of seven steps for the ADSL service, and the processing power required for this initialization process is about several hundreds of MIPS, which is more than that of other modulation and demodulation devices.

In addition, the conventional method of initializing an ADSL apparatus drives an initialization unit in charge of a corresponding subscriber channel in the order of the subscriber channels to be connected to perform an initialization operation. As a result, the initialization unit 21 of each DSP unit 2 performs an initialization process for different subscriber channels independently of each other.

As a result of the conventional method of initializing the ADSL apparatus, the conventional ADSL apparatus has a processing power equal to the result of (the processing power of one initialization process) x (the number of simultaneously connected channels) when a plurality of channels are concurrently connected Therefore, there is a problem that the processing power is increased according to the number of connection channels, and accordingly, the device is overloaded.

However, the problem of imposing a load on the apparatus due to the increased processing power depending on the number of connection channels can be solved to some extent by installing a high performance DSP core in units of giga MIPS.

However, since the cost of the high-performance DSP core is high, the cost of the device is burdensome, and when the initialization process for a plurality of subscriber channels is simultaneously performed, the ADSL modem initialized once is sufficiently initialized There is a problem in that the connected subscriber line goes into the reinitialization process and is disconnected.

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SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to stably initialize a subscriber channel while reducing the processing power of the initialization process for a plurality of subscribers connected at the same time.

According to an aspect of the present invention, there is provided a method for performing a handshake (HS) step, a time domain equalizer (TEQ) step, an echo canceler (EC) step, a frequency domain equalizer (FEQ) the start time of the initialization process for sequentially performing the seventh step of the show time is controlled differently for each subscriber channel.
If the starting point of the initialization process for each subscriber channel is different, the redundancy of the initialization process for each subscriber channel is reduced.

The present invention proposes two methods as follows to differentiate the starting point of the initialization process for each subscriber channel as follows.
As a first method, there is a method of preventing the start time of the initialization process from being duplicated. This method requires only that the starting points of the initialization process for two or more subscriber channels are different from each other. Therefore, an initialization start point for a plurality of subscriber channels may exist in one of the seven steps of the initialization process. As a second method, there is a method of preventing duplication of steps of the same initialization process. In this method, since the initialization start time is set at different stages among the 7 stages of the initialization process, only one initialization start time for one subscriber channel exists in one initialization step.

In order to achieve the above-described features, the ADSL modem apparatus of the present invention unifies a plurality of initialization units corresponding to each subscriber channel into one initialization unit so that initialization processes for each subscriber channel do not independently perform, The initialization process of the subscriber channel is performed. At this time, the unified initialization unit can independently perform the initialization step 7, and can perform the initialization process consisting of 7 steps in duplicate.
The ADSL modem apparatus of the present invention includes an initialization scheduler unit for controlling an initialization operation of the initialization unit in addition to the initialization unit to achieve the above-described feature. The initialization scheduler unit controls the initialization unit so that initialization processes for a plurality of subscriber channels are not started at the same time. When receiving an ADSL service request from an ADSL terminal installed on the subscriber side, the initialization scheduler unit confirms a channel of a subscriber requested for the service, So that it is not started at the same time as the initialization process.

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In more detail, an initialization method of an ADSL modem for achieving the object of the present invention is a method for initializing an initialization step of an HS-DSCH step, a TEQ step, an EC step, an FEQ step, a channel analysis step, And an initialization scheduler for controlling an initialization operation of the initialization unit and connected to a terminal of the subscriber, and a plurality of demodulators / demodulators, the method comprising the steps of:

A first step of sequentially selecting subscriber channels connected to the initialization scheduler by the initialization scheduler, selecting one subscriber channel, determining whether the selected subscriber channel is in an idle state, If the selected subscriber channel is idle and there is no other subscriber channel performing the HS step as a result of the second process, it is checked whether an ADSL service request signal is received from the subscriber, If it is determined in step 3 that the selected subscriber channel is performing one of the six steps excluding the show time step and the current step is completed and there is no other subscriber channel performing the next initialization step to perform After the initialization step to be performed next is started, the process returns to the first step If the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber side as a result of the second step, after completing the initialization process for the corresponding subscriber channel and returning to the first process And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel that has been subjected to the initialization process of step 7, and outputting the data.

Hereinafter, an ADSL modem apparatus and an initialization method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the structure of an ADSL modem apparatus according to an embodiment of the present invention. 2, the ADSL modem apparatus according to an exemplary embodiment of the present invention receives voice, video, or general data transmitted from a plurality of subscriber channels that have been initialized, An input / output interface unit 50 having an interface unit 10 and performing an intermediate interface function to input / output the demodulated / demodulated data to / from the AFE apparatus is provided.

Also, the ADSL modem apparatus of the present invention modifies / demodulates data transmitted from each subscriber channel transmitted through the network interface unit 10 and transmits the data to the input / output interface unit 50, Demodulator 40 for transmitting / demodulating data to / from the corresponding subscriber channel and a demodulator / demodulator 41, 42, 43, ... for the number of subscriber channels in the demodulator / demodulator 40. ..).

The ADSL modem apparatus of the present invention includes an interface unit 10 and 50 and a demodulator unit 40 and an initialization unit 30 and an initialization scheduler unit 20, .

The initialization unit 30 performs an initialization operation performed by the initialization unit of the conventional DSP unit. However, the initialization unit 30 is designed to perform a plurality of initialization processes, thereby performing initialization processes for multiple subscriber channels in a redundant manner. At this time, the initialization unit 30 is provided with a device (or a device) that functions as a buffer internally so that the initialization start time of the overlapping initialization process is not simultaneously performed.

The initialization scheduler unit 20 controls the initialization operation of the initialization unit 30. [ That is, the initialization scheduler unit 20 causes the initialization unit 30 to start the initialization operation for the corresponding subscriber channel if there is a subscriber channel to be connected to the initialization scheduler unit 20, And controls the initialization unit 30. [

Here, the initialization operation of the initialization unit 30 will be described with reference to FIG.

3 is a diagram illustrating an initialization process of an ADSL modem according to an exemplary embodiment of the present invention. 3, the initialization process of the initialization unit 30 includes an HS (Handshake) process SI1, a TEQ (Time domain EQualizer) training process SI2, an EC (echo canceler) training process SI3, (Frequency Domain Equalizer) training process (SI4), channel analysis process (SI5), exchange process (SI6), and show time process (S &

In the HS process (SI1), it checks the preparation for signal transmission. It detects the connection to the other station, pre-exchanges necessary elements for line connection, and identifies the chipset or product name of the other station in this process.

The TEQ training process (SI2), the EC process (SI3) and the FEQ process (SI4) are timing recovery, synchronization and transceiver training processes. (SI2) analyzes the distortion characteristic of the line in the frequency domain and determines the coefficient of the TEQ which is a filter for compensating the distortion. The EC process (SI3) removes the echo signal and the EFQ process (SI4) To the time domain and determines the coefficient of the FEQ, which is a filter for compensating the time domain.

The channel analysis process (SI5) calculates the signal-to-noise ratio (SNR) of the corresponding band by sending a reverb signal corresponding to the band occupied by each multi-tone on the line. The exchange process SI6 exchanges information on the bit allocation amount calculated based on the SNR of each multi-tone bands and the various parameters determined in the processes SI1 to SI5 with the partner station, and the show time process SI7 And transmits the actual data.

Hereinafter, the operation of the initialization scheduler unit 20 will be described with reference to FIG.

The initialization scheduler unit 20 receives the driving signal SI of the ADSL terminal apparatus when the ADSL terminal apparatus installed in the other station is driven by the subscriber. At this time, the driving signal SI of the ADSL terminal is of the same type as a pilot signal used in wireless communication or an incoming call signal of a wired telephone, and is a sine wave signal.

Upon receiving the driving signal SI, the initialization scheduler unit 20 transmits a signal for asking subscriber channel information to the ADSL terminal apparatus that has transmitted the driving signal SI, to know the subscriber channel information owned by the ADSL terminal apparatus, When the information of the channel is known, the basic operation is to control the initialization unit 30 so that the subscriber channel is initialized.

The operation of the initialization scheduler unit 20 for achieving the object of the present invention is such that even if a plurality of driving signals are simultaneously received, the initialization process of the subscriber channels corresponding to the respective reception signals is not performed at the same time, The initialization process is performed in random order so that the same initialization process (one of SI1 to SI7) is not overlapped.

Here, the simultaneous reception means that the data is received during the execution of one initialization process (one of SI1 to SI7), and furthermore, when it is divided into several tens, hundreds, It is almost impossible for the signal to be received. If at least two drive signals are received at exactly the same time, the initialization scheduler unit 20 arbitrarily determines the order.

An example of the operation of the initialization scheduler unit 20 will be described with reference to FIG. 4 is a view for explaining the operation of the initialization scheduler unit according to the embodiment of the present invention. In the worst case, five drive signals S ₁ , S ₂ , S ₃ , S ₄ , and S ₅ are simultaneously received It is about the case.

The initialization scheduler unit 20 preferentially responds to the drive signal S ₁ received first when the _five drive signals S ₁ , S ₂ , S ₃ , S ₄ , and S ₅ are simultaneously received, So that the initialization process (SI1 to SI7) is performed. At this time, it is assumed that the received order is S ₁ , S ₂ , S ₃ , S ₄ , S ₅ . The term " response " refers to enabling an operation corresponding to a received signal, and refers to requesting and checking subscriber channel information from a partner station.

When the HS process SI1 is performed during the initialization process corresponding to the driving signal S ₁ and the other driving signals S ₂ , S ₃ , S ₄ and S ₅ are received, S ₂ , S ₃ , S ₄ , and S ₅ during the execution of the driving signal S ₁ . Accordingly, the drive signals S ₁ , S ₂ , S ₃ , S ₄ , and S ₅ are continuously received by the initialization scheduler unit 20 as shown in FIG.

On the other hand, the end of the HS process (SI1) to respond to the drive signal (S _1), the initialization scheduler section 20 subscriber channel information from the other station in response to a drive signal (S ₂₎ receiving the next drive signal (S ₁₎ the service receiving process allows the HS (SI1) to meet the TEQ process at the time of driving (SI2) the start signal (S ₂₎ to meet the driving signal (S ₁₎ starts. At this time, the initialization scheduler unit 20 does not respond to the other drive signals S ₃ , S ₄ , and S ₅ .

At the point of time when the HS process SI1 corresponding to the drive signal S ₂ ends, the time point at which the FEQ process SI ₂ corresponding to the drive signal S ₂ starts, which reacts only with the drive signal S ₃ At this time, the HS process SI1 corresponding to the drive signal S ₃ is started at the EC process SI3 for the drive signal S ₁ ).

Accordingly, by repeating this process, the initialization scheduler unit 20 causes the initialization process to be performed for multiple simultaneously received driving signals S ₁ to S ₅ without overlapping as shown in FIG.

Here, the sequential initialization process controlled by the initialization scheduler unit 20 depends on the number of input ports, that is, the number of input ports receiving the driving signal. That is, when five input ports, the number of subscriber channels in which the initialization process is sequentially performed in one initialization process (SI1 to SI7) is five, and the maximum number of input ports is seven. Through this fact, it can be seen that the number of input ports of the initialization scheduler unit 20 is 7 because the initialization process is 7 steps.

If a plurality of driving signals are not received at the same time, the initialization scheduler 20 waits until the initialization process (one of SI1 to SI7) in progress is completed for the received driving signal, SI1 to SI7) is started.

 Hereinafter, a method of initializing an ADSL modem apparatus according to an embodiment of the present invention will be described with reference to FIGS. 5A and 5B. FIG.

5A and 5B are operation flowcharts when the initialization process in the other channel is not performed based on the driving signal S ₁ according to the embodiment of the present invention.

First, the initialization scheduler according to the embodiment of the present invention has seven input ports and is responsible for seven subscriber channels.

A driving signal is generated from at least one of the ADSL terminal apparatuses of the other station to which the N subscriber channels are allocated and the driving signal S ₁ transmitted from one of the ADSL terminal apparatuses is received by the initialization scheduler unit 20 ).

Upon receiving the drive signal S ₁ , the initialization scheduler unit 20 determines whether the initialization process for another subscriber channel is currently being performed by reading the corresponding information from the initialization unit 30 (S511).

Initialization scheduler section 20 is the target station for the subscriber channel information of the subscriber sends a drive signal (S ₁₎ when it is determined that the subscriber channel is performing the initializing process in the determination (S511) in response to the driving signal (S ₁₎ And controls the initialization unit 30 so that the corresponding subscriber channel is initialized. As a result, the initialization of the HS step (SI1) is performed on subscriber channel for the subscriber generated a drive signal (S ₁₎ (S512).

The fact that the initialization process is not performed in the other channel at the time when the driving signal S ₁ is received means that the initialization process of any channel at the time of starting the HS step SI ₁ for the driving signal S ₁ at the present time Is not being started.

In this state, the initialization scheduler unit 20 checks whether the drive signal S _n is received regardless of the initialization process of the drive signal S ₁ (S 513). If another driving signal S _n is received in this checking process, the driving signal Sn received at this time is the first received driving signal during the initialization process for the subscriber channel corresponding to the driving signal S ₁ , Accordingly, the initialization scheduler unit 20 determines the sequence N as the first drive signal S _n (S514).

Referring to FIG. 5A, the description of S _n = S _{n + 1} in step S514 is made to understand the following process more easily, and is not related to the operation of the present invention. Here, the driving signal having the first order is S ₂ .

The initialization scheduler unit 20 continues to perform the HS step SI1 for the driving signal S ₁ while performing the step S514 to check whether another driving signal is received at steps S515 and S516.

If another drive signal is received, this drive signal becomes the second order and becomes S ₃ (S514), and the above steps (S515, S516) are repeated continuously. This repetition is performed until the HS step SIl for the subscriber channel corresponding to the driving signal S ₁ is completed (S517).

During the HS step, there may be no drive signal received through the repetition of steps S513 through S516, or at least one.

If there is no received drive signal during the repetition of the above steps (SA; S513 to S516), the initialization scheduler unit 20 performs the TEQ step SI2 only for the drive signal S ₁ , If there is more than at least one is to start the HS step (SI1) for the subscriber channel corresponding to the drive signal (S ₁₎ TEQ step in the sequence is first driven at the time of (SI2) the start signal (S ₂₎ of the ( S518).

The initialization scheduler unit 20 continuously performs the steps S513 to S516 regardless of whether the TEQ step SI2 for the drive signal S ₁ is performed (and the HS step for the drive signal S ₂ ) A process of determining a sequence for a newly received drive signal and a process of confirming a received drive signal are repeated (S519).

This repetition (S519) is performed until the completion of the TEQ step for the drive signal S1 (and completion of the HS step for the drive signal S2) is completed (S520).

The subscriber channel corresponding to when the step (S520) is performed, the initialization scheduler unit 20 (if the case) in the current determined sequence the second drive signal (S ₃₎ reaction, and the driving signal (S ₁₎ with respect to the makes for start for the at the time of starting the phase EC (SI3) for the drive signal (S ₂₎ TEQ step (SI2), a drive signal (S ₃₎ HS step (SI1) (S521).

Here, it can be seen that the driving signal for starting the HS step SI1 is the first one among those that have not been subjected to the initialization process.

Initializing the scheduler unit 20 will continue the process until it is complete, the EC step (SI3) of the subscriber channels that corresponds to the driving signal (S _1): and to repeat the process and (SB S513 to S517), the driving The next initialization step for the subscriber channel corresponding to the driving signal S ₂ , S ₃ being currently being initialized is started at the time when the FEQ step SI 4 for the subscriber channel corresponding to the signal S ₁ starts, If the initialization process still allows a drive signal has not been performed the driving sinhojung sequence that is not the initialization process is performed in this case be done by a HS step (SI1) on the first drive signal (S _4). Hereinafter, the channel analysis step SI5, the exchange step SI6, and the show time step SI7 for the drive signal S ₁ are also performed. If there is a subscriber channel corresponding to the drive signal that is not yet initialized, SB) are continuously repeated (S522).

Therefore, even when no more driving signals are received until the initialization process of step 7 is completed for the subscriber channel corresponding to the driving signal S ₁ , as shown in FIG. 4, only the subscriber channels for the driving signals of the seventh system Initialization is performed.

On the other hand, in the initialization process for the driving signal S ₁ , when one driving signal is received during the HS step SI 1 and the next driving signal is received in the FEQ step SI 4,

The first drive signal is initiated at the start of the TEQ step SI2 for the drive signal S _{1 and} the second drive signal is initiated at the point in time at which the channel analysis step SI 5 for the drive signal S ₁ begins The initialization is started.

The subscriber channels when the initialization process of step 7 is complete for a subscriber channel corresponding to the drive signal (S _1), corresponding to, as illustrated in Figure 5b, the network interface unit 10 is provided with a drive signal (S ₁₎ (S523).

Then, the network interface unit 10 performs a frame process of the link layer with respect to the received data, and then transmits the frame to the demodulator / demodulator 40. The demodulator / demodulator 40 modulates or demodulates the data, And outputs it to the interface unit 50 (S524).

The input / output interface unit 50 outputs the modulated or demodulated data to the AFE apparatus (S525).                     

As described above, according to the present invention, the same initialization process is not duplicated, and initialization for all subscriber channels can be performed sufficiently with only the processing power required by one initialization unit.

Hereinafter, an ADSL modem apparatus and an initialization method thereof according to the present invention will be described with reference to FIGS. 5A and 5B, with reference to FIGS. 6A to 6I. FIG. 6A to 6I, it is assumed that the number of input ports of the initialization scheduler unit 20 is five.

6A, in the ADSL modem initialization method of the present invention, power is applied to the apparatus of the present invention (S610), parameters related to all channels are initialized (S611), and the initialization scheduler unit (20) and the initialization unit (30).

Here, the initialization scheduler 20 sequentially selects five input ports when the parameters are initialized, and performs the following steps S614-S623, respectively. The sequential selection is continuously performed as shown in step S613 Continue.
Since the operation of the initialization scheduler unit 20 and the initialization unit 30 is the same for each input port, only the first input port (i = 1) will be described below.

The initialization scheduler unit 20 selects one set of input ports I = 1 in step S612 and sets a subscriber channel corresponding to the input port I = (S614), or if one of the initialization 7 steps (one of S615 to S621) is being performed.

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Here, the idle state refers to a state in which no initializing operation is performed on the subscriber channel. Therefore, the fact that the first subscriber channel is in the idle state means that the subscriber channel should be checked, and not the idle state means that one of the initialization step 7 is being performed.
(If idle)
If the first subscriber channel is in the idle state (S614), the initialization scheduler unit 20 starts the process S1 to check if an ADSL service request signal has been generated from the subscriber.
Hereinafter, the process S1 will be described with reference to FIG. 6B.
The process S1 is the operation of the initialization scheduler when the first subscriber channel is idle. As shown in FIG. 6B, the initialization scheduler 20 determines whether the HS step SI1 is performed on another subscriber channel to avoid overlap with another subscriber channel (S631). Therefore, if the HS step is performed in another subscriber channel, the next input port is incremented by one (S623) after inserting the HS step for the first subscriber channel, and then the input port (I = 2) is checked. On the other hand, if the HS step is not performed in another subscriber channel, the first subscriber channel is set to the HS step (S632).
Here, if the corresponding subscriber channel is delayed without performing the corresponding operation, the corresponding operation can be performed again after the examination for all of the other subscriber channels is completed.
(When in the HS state)
If the first subscriber channel is not in the idle state, the initialization scheduler unit 20 checks whether it is in the HS state (S615). If it is determined that the HS state is in the HS state, the initialization scheduler unit 20 performs the process S2 in accordance therewith.
Hereinafter, the process (S2) will be described with reference to FIG. 6C.
The process S2 is the operation of the initialization scheduler when the first subscriber channel is in the HS state.
As shown in Fig. 6C, the initialization scheduler unit 20 determines whether it is monitoring the other station (i.e., the subscriber side terminal apparatus) (S641).
Monitoring the other station is to determine whether a driving signal (that is, a pilot signal) is received from the ADSL terminal of the other station and perform an initialization process.
If it is determined in step S641 that the target station is being monitored, it is determined whether a pilot signal is detected from the target station in step S642. If no pilot tone is detected in step S642, the first subscriber channel is idle S643). If the pilot tone is detected, the HS subscriber station is performed in step S644.
On the other hand, if it is determined in step S641 that the target station is not being monitored, the initialization scheduler unit 20 determines that the HS step is being performed and determines whether the HS step is completed (step S645). If the HS step is not completed in step S645, the next subscriber channel is checked (step S623). If the HS step is completed, a TEQ step is performed in another subscriber channel (S646).
The checking process (S646) is performed to avoid duplication of steps.
If it is determined in step S646 that the TEQ step is not performed on another subscriber channel, the TEQ step is performed on the first subscriber channel (S647). If the TEQ step is performed on another subscriber channel, The initialization process for the next subscriber channel is performed (S623).
(In the TEQ state)
If the first subscriber channel is not in the HS state, the scheduler unit 20 checks whether it is in the TEQ state (S616). If it is determined that the TEQ state is in the TEQ state, the scheduler unit 20 performs step S3 according to the TEQ state.
Hereinafter, the process (S3) will be described with reference to FIG. 6D.
Step S3 is the operation of the initialization scheduler when the first subscriber channel is in the TEQ state. 6D, the initialization scheduler unit 20 determines whether the TEQ step has been completed (S651). If the TEQ step has not been completed by the determination in step S651, the initial scheduler unit 20 performs a check (S623) on the next subscriber channel do.
If the TEQ step has been completed in step S651, it is determined whether the EC step is being performed in another subscriber channel to avoid duplication of the initialization step in step S652. In step S652, (S623), and if the TEQ step is not performed in another subscriber channel, the EC step is performed (S653).
(When in the EC state)
If the first subscriber channel is not in the TEQ state, the scheduler unit 20 checks whether it is in the EC state (S617). If it is determined to be in the EC state, the scheduler unit 20 performs a process S4 according to the EC state.
Hereinafter, step S4 will be described with reference to FIG. 6E.
Step S4 is the operation of the initialization scheduler when the first subscriber channel is in the EC state.
6E, when the first subscriber channel is in the EC state, the initialization scheduler unit 20 determines whether the EC step is completed (S661). If the EC step is not completed, the initialization scheduler unit 20 sets the next input port I = 2 (S623). If the EC step is completed, it is determined whether the FEQ step is being performed on another subscriber channel (S662).
If it is determined in step S662 that the FEQ step is not being performed on another subscriber channel, the BS performs the FEQ step on the first subscriber channel (step S663). If the FEQ step is performed on another subscriber channel, the step 623 is performed .
(In the FEQ state)
If the first subscriber channel is not in the EC state, the scheduler unit 20 checks whether the FEQ state is present (S618). If it is determined that the FEQ state is satisfied, the scheduler unit 20 performs the process S5 according to the FEQ state.
Hereinafter, the process S5 will be described with reference to FIG. 6F.
The process S5 is the operation of the initialization scheduler when the first subscriber channel is in the FEQ state. 6F, when the first subscriber channel is in the FEQ state, the initialization scheduler unit 20 determines whether the FEQ step is completed (S671). If the FEQ step is not completed, the initial scheduler unit 20 sets the next input port I = 2 (S623). If the FEQ step is completed, it is determined whether the channel analysis step is being performed in another subscriber channel (S672).
If it is determined in step S672 that the channel analysis step is not being performed in the other subscriber channels, step S673 is performed for the first subscriber channel. If the channel analysis step is performed in the other subscriber channels, .
(If channel analysis is in progress)
If the first subscriber channel is not in the FEQ state, the scheduler unit 20 checks whether it is in the channel analysis state (S619). If it is determined that the channel analysis state is the state, the process S6 is performed.
Hereinafter, the process (S6) will be described with reference to FIG. 6G.
The process S6 is the operation of the initialization scheduler when the first subscriber channel is in a channel analysis state. 6G, when the first subscriber channel is in the channel analysis state, the initialization scheduler unit 20 determines whether the channel analysis step is completed (S681). If the channel analysis step is not completed, the initialization scheduler unit 20 I = 2) (S623). If the channel analysis step is completed, it is determined whether the exchange step is being performed on another subscriber channel (S682).
If it is determined in step S682 that the exchange step is not being performed on another subscriber channel, the exchange step is performed on the first subscriber channel (step S683). If the channel analysis step is performed on another subscriber channel, step 623 is performed do.
(When exchanged)
If the first subscriber channel is not in the channel analysis state, the initialization scheduler unit 20 checks whether it is in the exchange step state (S620). If it is determined that the channel analysis state is the state, the process S7 is performed.
Hereinafter, the process (S7) will be described with reference to FIG. 6H.
The process S7 is the operation of the initialization scheduler when the first subscriber channel is in the exchange phase state. 6H, the initialization scheduler 20 determines whether or not the exchange step has been completed (S691). If the exchange step has not been completed, the initial scheduler unit 20 proceeds to step S623 to check the next input port (I = 21) When the exchange step is completed, the show time step is performed (S692).
(In the case of the show time state)
If the first subscriber channel is not in the switched state, the initialization scheduler unit 20 checks whether it is in the show time step (S621). If it is determined that the show time is in the show time state, the initialization scheduler unit 20 performs step S8.
Hereinafter, the process (S8) will be described with reference to FIG. 6I.
If the first subscriber channel is a show time step, the initialization scheduler unit 20 determines whether or not a signal with the other station is synchronized in order to determine whether a show time step for transmitting actual data is in progress (S601) If it is determined that data is being transmitted, the next input port (I = 2) is checked (S623). If the signal is not synchronized, the first subscriber channel is idle (S602).
After the show time step is completed, the subscriber channel modulates or demodulates the data of the other station to the network interface unit 10, and the data / demodulation unit 22 modulates or demodulates the data, .
Here, the initialization scheduler unit 20 sequentially examines the input ports sequentially so that the corresponding operations of the input ports in the standby state are performed.

And, when the other subscriber channels do not perform the same initialization step, the corresponding initialization step is performed, thereby preventing the processing power from being increased.

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Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

 The present invention is capable of supporting the maximum number of subscribers by appropriately adjusting the initialization time with only the processing power capable of handling initialization of a single subscriber channel.

In addition, the present invention appropriately controls the operation timing of the initialization function that requires the most processing power, thereby efficiently using the processing power without wasting processing power, thereby achieving high performance DSP function and comparable performance without using an expensive high performance DSP core Thereby contributing to a reduction in manufacturing cost.

Claims (16)

delete An ADSL modem apparatus using a DMT (Discrete Multi Tone) modulation / demodulation scheme including a network interface unit, a plurality of demodulation / demodulation units, and an input / output interface unit, An initialization step 7 for a plurality of subscriber channels, which is a handshake (HS) step, a time domain equalizer (TEQ) step, an echo canceler (EC) step, a frequency domain equalizer (FEQ) step, a channel analysis step, An initialization unit for sequentially performing the operation; And The initialization unit controls the initialization unit to perform an initialization process for a corresponding subscriber channel according to a driving signal received from the ADSL terminal apparatuses on the subscriber side, and when the initialization process for two or more subscriber channels is performed in duplication And an initialization scheduler unit adapted to correspond initialization start times of respective subscriber channels to different initialization steps, The initialization unit Wherein the one hardware device commonly corresponds to the plurality of demodulation / demodulation units, and the initialization process can be performed up to seven times at a maximum. 3. The method of claim 2, Wherein the initialization scheduler comprises: Wherein the input port is provided for the number of subscriber channels that the subscriber is responsible for and the sequence number of the initialization process is determined as a time difference even when a plurality of drive signals are simultaneously received by monitoring the input port sequentially . The method of claim 3, Wherein the initialization scheduler comprises: If the initialization process for the second subscriber channel is started, the starting point of the initialization process for the first subscriber channel is set to a point at which the corresponding step ends and the new step is started To the ADSL modem device. delete In the DTM (Discrete Multi Tone) modulation / demodulation scheme, an initialization process is performed to sequentially perform the seven steps of the HS step, TEQ step, EC step, FEQ step, channel analysis step, exchange step and show time step, In the ADSL modem initialization method, A first step of identifying a first subscriber channel requesting an ADSL service; And And a second step of performing an initialization process so that each of the seven steps of the initialization process for the first subscriber channel is not overlapped with each of the seven steps of the initialization process for another subscriber channel, The redundancy is overlapped with the same initialization step, In the first step, Sequentially selecting a plurality of subscriber channels one by one and checking whether an ADSL service request signal is received from a selected subscriber channel. In the DTM (Discrete Multi Tone) modulation / demodulation scheme, an initialization process is performed to sequentially perform the seven steps of the HS step, TEQ step, EC step, FEQ step, channel analysis step, exchange step and show time step, In the ADSL modem initialization method, A first step of identifying a first subscriber channel requesting an ADSL service; And And a second step of performing an initialization process so that each of the seven steps of the initialization process for the first subscriber channel is not overlapped with each of the seven steps of the initialization process for another subscriber channel, The redundancy is overlapped with the same initialization step, In the second process, If the initialization process is performed for one or more subscriber channels, And initializing the initialization time of each of the initialization step (7). delete At least one initialization unit sequentially performing an initialization step of an HS channel step, a TEQ step, an EC step, an FE step, a channel analysis step, an exchange step and a show time step with respect to a subscriber channel, (DMT) modulation / demodulation scheme including a plurality of demodulators and a plurality of demodulators, the method comprising the steps of: A first step of sequentially selecting subscriber channels connected to the initialization scheduler; A second step of determining whether the selected subscriber channel is in an idle state or a step of initializing step 7 when one subscriber channel is selected; As a result of the second process, if the selected subscriber channel is idle and there is no other subscriber channel performing the HS step, a third step of determining whether the ADSL service request signal is received from the subscriber and then determining whether to start the HS step ; As a result of the second step, if the selected subscriber channel is one of the six steps except for the showtime and the current step is completed and there is no other subscriber channel performing the next initialization step to perform, And then returning to the first step; A fifth step of returning to the first step after completing the initialization process for the subscriber channel if the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber as a result of the second step; And And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel having completed the initialization process of step 7, The second step For the currently selected subscriber channel, proceed to the checking step in the order of idle state → HS step → TEQ step → EC step → FEQ step → channel analysis step → exchange step → show time step → idle state The ADSL modem apparatus comprising: At least one initialization unit sequentially performing an initialization step of an HS channel step, a TEQ step, an EC step, an FE step, a channel analysis step, an exchange step and a show time step with respect to a subscriber channel, (DMT) modulation / demodulation scheme including a plurality of demodulators and a plurality of demodulators, the method comprising the steps of: A first step of sequentially selecting subscriber channels connected to the initialization scheduler; A second step of determining whether the selected subscriber channel is in an idle state or a step of initializing step 7 when one subscriber channel is selected; As a result of the second process, if the selected subscriber channel is idle and there is no other subscriber channel performing the HS step, a third step of determining whether the ADSL service request signal is received from the subscriber and then determining whether to start the HS step ; As a result of the second step, if the selected subscriber channel is one of the six steps except for the showtime and the current step is completed and there is no other subscriber channel performing the next initialization step to perform, And then returning to the first step; A fifth step of returning to the first step after completing the initialization process for the subscriber channel if the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber as a result of the second step; And And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel having completed the initialization process of step 7, In the third step, When the selected subscriber channel is idle and there is no other subscriber channel performing the HS step and an ADSL service request signal is received from the subscriber side, the HS step is started for the subscriber channel, and then the next subscriber channel is selected To the ADSL modem apparatus. At least one initialization unit sequentially performing an initialization step of an HS channel step, a TEQ step, an EC step, an FE step, a channel analysis step, an exchange step and a show time step with respect to a subscriber channel, (DMT) modulation / demodulation scheme including a plurality of demodulators and a plurality of demodulators, the method comprising the steps of: A first step of sequentially selecting subscriber channels connected to the initialization scheduler; A second step of determining whether the selected subscriber channel is in an idle state or a step of initializing step 7 when one subscriber channel is selected; As a result of the second process, if the selected subscriber channel is idle and there is no other subscriber channel performing the HS step, a third step of determining whether the ADSL service request signal is received from the subscriber and then determining whether to start the HS step ; As a result of the second step, if the selected subscriber channel is one of the six steps except for the showtime and the current step is completed and there is no other subscriber channel performing the next initialization step to perform, And then returning to the first step; A fifth step of returning to the first step after completing the initialization process for the subscriber channel if the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber as a result of the second step; And And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel having completed the initialization process of step 7, In the third step, And if the selected subscriber channel is idle and no other subscriber channel is performing the HS step and the subscriber does not receive the ADSL service request signal, the idle state is established. At least one initialization unit sequentially performing an initialization step of an HS channel step, a TEQ step, an EC step, an FE step, a channel analysis step, an exchange step and a show time step with respect to a subscriber channel, (DMT) modulation / demodulation scheme including a plurality of demodulators and a plurality of demodulators, the method comprising the steps of: A first step of sequentially selecting subscriber channels connected to the initialization scheduler; A second step of determining whether the selected subscriber channel is in an idle state or a step of initializing step 7 when one subscriber channel is selected; As a result of the second process, if the selected subscriber channel is idle and there is no other subscriber channel performing the HS step, a third step of determining whether the ADSL service request signal is received from the subscriber and then determining whether to start the HS step ; As a result of the second step, if the selected subscriber channel is one of the six steps except for the showtime and the current step is completed and there is no other subscriber channel performing the next initialization step to perform, And then returning to the first step; A fifth step of returning to the first step after completing the initialization process for the subscriber channel if the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber as a result of the second step; And And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel having completed the initialization process of step 7, In the third step, And if the selected subscriber channel is idle and there is another subscriber channel performing the HS step, the method returns to the first step so that the next subscriber channel is selected after the standby state is maintained. At least one initialization unit sequentially performing an initialization step of an HS channel step, a TEQ step, an EC step, an FE step, a channel analysis step, an exchange step and a show time step with respect to a subscriber channel, (DMT) modulation / demodulation scheme including a plurality of demodulators and a plurality of demodulators, the method comprising the steps of: A first step of sequentially selecting subscriber channels connected to the initialization scheduler; A second step of determining whether the selected subscriber channel is in an idle state or a step of initializing step 7 when one subscriber channel is selected; As a result of the second process, if the selected subscriber channel is idle and there is no other subscriber channel performing the HS step, a third step of determining whether the ADSL service request signal is received from the subscriber and then determining whether to start the HS step ; As a result of the second step, if the selected subscriber channel is one of the six steps except for the showtime and the current step is completed and there is no other subscriber channel performing the next initialization step to perform, And then returning to the first step; A fifth step of returning to the first step after completing the initialization process for the subscriber channel if the selected subscriber channel is in the show time step and the signal is synchronized with the subscriber as a result of the second step; And And a sixth step of modulating or demodulating the received data when the data is received from the subscriber channel having completed the initialization process of step 7, The fourth step If the selected subscriber channel is one of the six steps except for the show time and the currently executing step is completed and there is another subscriber channel performing the next initialization step to be performed, 1 ". < / RTI > 14. The method of claim 13, In the fourth step, And if the selected subscriber channel is one of the six steps except for the show utterance and the current step is not completed, the method returns to the first step after maintaining the standby state. 14. The method of claim 13, The fifth step And returning to the first step after the selected subscriber channel is in the show time step and the signal is not synchronized with the subscriber side, and then returns to the first step. delete

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