KR20210120417A - Measuring apparatus for subscriber, and control method thereof - Google Patents

Abstract

The present invention relates to a device for detecting a subscriber that distinguishes whether a subscriber modem connected to an optical line exists or not by analyzing an optical signal scattered from a bending connection section of the optical line in an IPTV service environment in which a fiber to the home (FTTH)-based optical subscriber network is configured; and an operating method thereof. The device for detecting the subscriber comprises: a detection part; an extraction part; and a distinguishing part. Therefore, the present invention is capable of allowing a stable IPTV service environment to be provided.

Description

SUBSCRIBER, AND CONTROL METHOD THEREOF

The present invention analyzes the optical signal scattered from the bending connection section of the optical line in the IPTV service environment in which the FTTH (Fiber To The Home)-based optical subscriber network is configured to determine whether there is a subscriber modem connected to the optical line. is to determine

Currently, as optical communication technology is developed in relation to IPTV service and subscriber traffic is increased at a high speed, FTTC (Fiber To The Curb) or FTTH (Fiber To The Home), in which optical lines are installed to the subscriber's home, is being distributed. Optical cables are gradually expanding to subscriber modems in homes.

For reference, in the IPTV service environment in which optical communication technology is grafted, there is an Optical Line Terminal (OLT) that terminates the subscriber's optical signal at the office side. The optical subscriber network can be formed by connecting the subscriber network and the subscriber network.

However, in the case of an IPTV service environment, subscriber changes may occur frequently due to various reasons including, for example, new service subscription, service cancellation, and service area movement.

Therefore, in order to quickly respond to such a subscriber change characteristic in terms of maintenance for a stable IPTV service environment, it is necessary to prepare a method for detecting a subscriber modem connected to an optical line.

The present invention was created in consideration of the above circumstances, and the object of the present invention is to achieve a bending connection section of an optical line in an IPTV service environment in which an FTTH (Fiber To The Home)-based optical subscriber network is configured. It analyzes the optical signal scattered from the optical signal to determine the presence or absence of a subscriber modem connected to the optical line.

A subscriber detection apparatus according to an embodiment of the present invention for achieving the above object, the detection unit for detecting the optical signal scattered in the bending connection section of the optical line through the bending (Bending) connection to the optical line; an extractor for sampling the optical signal and extracting a data signal transmitted through the optical signal; and a judging unit that determines whether a subscriber modem connected to the optical line exists or not based on the extracted value of the data signal.

Specifically, the detection unit includes a first detection path for detecting any one of an upstream signal and a downstream signal with respect to a bending connection section of the optical line, and the first detection path The optical signal may be detected by forming a second detection path for detecting signals other than the detected signal.

Specifically, the extractor may select any one of the first detection path and the second detection path to perform sampling on only the optical signal detected through the selected detection path.

Specifically, the extractor may extract a data signal transmitted through the optical signal through time-division sampling of the optical signal as a signal waveform in which a level change is observed with respect to a time axis.

Specifically, when the period of the signal waveform at which the level change is observed with respect to the time axis matches the period of the upstream signal transmitted from the subscriber side, the determining unit is configured to include a subscriber modem connected to the optical line. It can be determined by

Specifically, the extractor converts a signal waveform in which a level change is observed with respect to the time axis into a signal waveform in which a level change is observed with respect to the frequency axis, and from the converted signal waveform, the existence of a subscriber modem connected to the optical line. presence or absence can be determined.

Specifically, the extractor may convert a signal waveform in which a level change is observed with respect to the frequency axis to a signal waveform in which a level change is observed with respect to the frequency axis when a noise level carried in the signal waveform in which the level change is observed with respect to the time axis exceeds a threshold value.

Specifically, when the frequency distribution of the signal waveform in which the level change is observed with respect to the frequency axis matches the frequency distribution of the upstream signal transmitted from the subscriber side, the determining unit is configured to include a subscriber modem connected to the optical line. can be determined to exist.

Specifically, the frequency distribution diagram may include a level summation value of a signal waveform in which a change is observed on the frequency axis.

A method of operating a subscriber detection apparatus according to an embodiment of the present invention for achieving the above object is a detection step of detecting an optical signal scattered in a bending connection section of the optical line through a bending connection to the optical line. ; an extraction step of sampling the optical signal and extracting a data signal transmitted through the optical signal; and determining whether or not there is a subscriber modem connected to the optical line based on the extracted value of the data signal.

Specifically, the detecting step includes a first detection path for detecting any one of an upstream signal and a downstream signal with respect to the bending connection section of the optical line, and the first detection The optical signal may be detected by forming a second detection path for detecting signals other than the signal detected in the path.

Specifically, in the extraction step, any one of the first detection path and the second detection path may be selected, and only the optical signal detected through the selected detection path may be sampled.

Specifically, in the extraction step, the data signal transmitted through the optical signal through time-division sampling of the optical signal may be extracted as a signal waveform in which a level change is observed with respect to a time axis.

Specifically, in the determining step, when the period of the signal waveform in which the level change is observed on the time axis matches the period of the upstream signal transmitted from the subscriber side, the subscriber modem connected to the optical line can be determined to exist.

Specifically, in the extraction step, the signal waveform in which the level change is observed with respect to the time axis is converted into a signal waveform in which the level change is observed with respect to the frequency axis, and from the converted signal waveform to the subscriber modem connected to the optical line. existence can be determined.

Specifically, in the extracting step, when the noise level carried in the signal waveform in which the level change is observed with respect to the time axis exceeds a threshold, it may be converted into a signal waveform in which the level change is observed with respect to the frequency axis.

Specifically, in the determining step, when the frequency distribution of the signal waveform in which the level change is observed on the frequency axis matches the frequency distribution of the upstream signal transmitted from the subscriber side, the subscriber connected to the optical line It can be determined that the modem exists.

Specifically, the frequency distribution diagram may include a level summation value of a signal waveform in which a change is observed on the frequency axis.

Accordingly, according to the subscriber detection apparatus and the operation method of the present invention, the optical signal scattered from the bending connection section of the optical line is analyzed in the IPTV service environment in which the FTTH (Fiber To The Home)-based optical subscriber network is configured. Through this method, it is possible to determine the presence or absence of a subscriber modem connected to an optical line without service interruption to subscribers, and thus, it is possible to provide a stable IPTV service environment through rapid maintenance for the characteristics of subscriber changes.

1 is an exemplary diagram illustrating a subscriber detection environment according to an embodiment of the present invention.
2 is an exemplary external view of a subscriber detection apparatus according to an embodiment of the present invention.
3 is an exemplary view for explaining a bending method according to an embodiment of the present invention.
4 is a schematic configuration diagram of a subscriber detection apparatus according to an embodiment of the present invention;
5 is an exemplary diagram for explaining a detection path according to an embodiment of the present invention.
6 is an exemplary diagram for explaining a waveform of a data signal according to an embodiment of the present invention;
7 is a flowchart for explaining a method of operating a subscriber detection apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In one embodiment of the present invention, an IPTV service environment in which a Fiber To The Home (FTTH)-based optical subscriber network is configured is handled.

In the IPTV service environment in which optical communication technology is grafted, there is an Optical Line Terminal (OLT) that terminates the subscriber's optical signal at the office side. Networks can be interconnected to form an optical subscriber network.

However, in the case of an IPTV service environment, subscriber changes may occur frequently due to various reasons including, for example, new service subscription, service cancellation, and service area movement.

Therefore, in order to quickly respond to such a subscriber change characteristic in terms of maintenance for a stable IPTV service environment, it is necessary to prepare a method for detecting a subscriber modem connected to an optical line.

Accordingly, in one embodiment of the present invention, it is intended to propose a method for determining whether a subscriber modem is connected to an optical line by analyzing an optical signal scattered from a bending connection section of an optical line in an IPTV service environment.

In this regard, FIG. 1 exemplarily shows a subscriber detection environment according to an embodiment of the present invention.

As shown in FIG. 1 , the subscriber detection environment according to an embodiment of the present invention is provided from the optical line between the optical fiber terminating device 10 and the subscriber modem 30 in the IPTV service environment in which the FTTH-based optical subscriber network is configured. It may have a configuration including a subscriber detection device 20 that analyzes the detected optical signal to determine whether or not the subscriber modem 30 is connected to the optical line.

The subscriber detection apparatus 20 refers to a portable device for detecting the subscriber modem 30 connected to the optical line for each subscriber, and may be implemented in the form shown in FIG. 2 , for example.

This, the subscriber detection device 20 is a primary splitter (Splitter) provided to establish an optical line for each subscriber between the optical path termination device (10) and the subscriber modem (30), and a secondary splitter among the secondary splitters (Splitter) An optical signal can be detected through a bending connection to an optical line branched from the (Splitter) end.

Here, in the case of an optical signal detected from an optical line branching from the secondary splitter end, a downstream signal that is a CW (Continuous Wave) transmitted from the optical path termination device 10 to the subscriber modem 30 (Downstream Signal) Conversely, an upstream signal that is a burst signal transmitted from the subscriber modem 30 to the optical fiber termination device 10 may be included.

For reference, a bending connection to an optical line made in an embodiment of the present invention may be performed, for example, through the same procedure as in FIG. 3 .

The subscriber modem 30 refers to an optical network unit (ONU, Optical Network Unit/ONT, Optical Network Terminal) located in a subscriber's home in a Fiber To The Home (FTTH)-based optical subscriber network.

As described above, in the subscriber detection environment according to an embodiment of the present invention, the subscriber modem 30 connected to the optical line can be detected through the above configuration. It will be described in more detail.

4 exemplarily shows the configuration of the subscriber detection apparatus 20 according to an embodiment of the present invention.

4, the subscriber detection apparatus 20 according to an embodiment of the present invention includes a detector 21 for detecting an optical signal, an extractor 22 for extracting a data signal from the optical signal, and a subscriber modem. It may have a configuration including a determining unit 23 for determining the presence or absence of (30).

All or at least a part of the configuration of the subscriber detection apparatus 20 including the abnormal detection unit 21, the extraction unit 22, and the determination unit 23 is implemented in the form of a hardware module or a software module, or a hardware module and a software module It can also be implemented in a combined form.

In particular, the extracting unit 22 and the determining unit 23 may be implemented in the form of instructions that are software modules that are executed by a processor that controls operations in the subscriber detecting apparatus 20, and these instructions are 20) It may have a form mounted in my memory.

On the other hand, the subscriber detection apparatus 20 according to an embodiment of the present invention, in addition to the above-described configuration, for an interface with a user who possesses the subscriber detection apparatus 20, for example, a UI configuration such as a display and a key pad further Of course, it can be included.

As described above, the subscriber detection apparatus 20 according to an embodiment of the present invention can detect the subscriber modem 30 connected to the optical line through the above-described configuration. Hereinafter, the subscriber detection apparatus 20 for realizing this I will continue with a more detailed explanation of each of my components.

The detection unit 21 performs a function of detecting an optical signal from the optical line.

More specifically, the detector 21 detects the optical signal scattered in the bending connection section of the optical line through a bending connection to the optical line.

At this time, the detection unit 21 detects a first detection path for detecting any one of an upstream signal and a downstream signal with respect to the bending connection section of the optical line, and the first detection path. The optical signal may be detected through each detection path formed by forming a second detection path for detecting the remaining signals except for the detected signal.

For example, referring to FIG. 5 , in the bending connection section of the optical line, the upstream signal is received through the first photodiode PD1 at a position opposite to the transmission direction of the upstream signal. The optical signal by forming the path (a) and the second detection path (b) through which the downstream signal is received through the second photodiode PD2 at a position opposite to the transmission direction of the downstream signal can be detected.

If, according to the bending connection direction of the optical line, the position opposite to the transmission direction of the upstream signal and the downstream signal is opposite to the above example, the first photodiode PD1 is Of course, it is possible to form a first detection path (a) through which a downstream signal is received and a second detection path (b) through which an upstream signal is received through the second photodiode (PD2).

The extractor 22 extracts a data signal from the optical signal.

More specifically, when an optical signal is detected in the bending connection section of the optical line, the extraction unit 22 samples the detected optical signal to extract a data signal transmitted through the optical signal.

At this time, the extraction unit 22 selects any one of the first detection path and the second detection path, and performs sampling only on the optical signal detected through the selected detection path, which is the first detection path or It may be understood to extract an upstream signal that can be detected through the second detection path.

That is, the extraction unit 22 extracts only the upstream signal transmitted from the subscriber modem 30 among the upstream signal and the downstream signal transmitted through the optical line, for example, a user selection or a first detection path and a second detection path. Any one of the first detection path and the second detection path is selected according to the frequency characteristic of the optical signal detected through , and only the optical signal detected through the selected detection path is sampled.

On the other hand, in extracting the data signal, the extraction unit 22 changes the level of the data signal transmitted through the optical signal through time-division sampling of the optical signal, for example, as shown in FIG. is extracted as an observed signal waveform, so that the presence or absence of the subscriber modem 30 can be determined from the extracted signal waveform.

Furthermore, when it is impossible to determine the existence of the subscriber modem 30 from the signal waveform in which the level change is observed with respect to the time axis, the extracting unit 22 determines the presence or absence of the subscriber modem 30 on the time axis, for example, as shown in FIG. 6(c). The signal waveform in which the level change is observed is converted into a signal waveform in which the level change is observed on the frequency axis, so that the presence or absence of the subscriber modem 30 connected to the optical line can be determined from the converted signal waveform.

Here, the case where it is impossible to determine the presence or absence of the subscriber modem 30 from the signal waveform in which the level change is observed on the time axis is the result of extracting the signal waveform in which the level change is observed on the time axis, for example, FIG. 6 (b) It may be understood as a case in which the magnitude of noise N carried in the corresponding signal waveform exceeds a threshold as in FIG.

The determining unit 23 performs a function of determining whether the subscriber modem 30 is present.

More specifically, when the data signal is extracted from the optical signal detected in the bending connection section of the line, the determining unit 23 determines whether or not the subscriber modem 30 is connected to the optical line based on the extracted value of the data signal. will determine

At this time, when a signal waveform whose level change is observed on the time axis is extracted from the detected optical signal, the determining unit 23 determines that the period T of the signal waveform is the period of the upstream signal transmitted from the subscriber side and the period T of the signal waveform. It is checked whether or not it matches, and when it is confirmed that the period of the upstream signal is matched as a result of the check, it can be determined that the subscriber modem 30 connected to the optical line exists.

In addition, when the signal waveform in which the level change is observed with respect to the time axis is converted into the signal waveform in which the level change is observed with respect to the frequency axis, the determination unit 23 determines the signal waveform in which the level change is observed with respect to the frequency axis. It is checked whether the frequency distribution diagram matches the frequency distribution diagram of the upstream signal transmitted from the subscriber side. can be discerned.

Here, the frequency distribution diagram, which is a reference for determining whether the subscriber modem 30 is present, may be understood as, for example, a level summation value of a signal waveform in which a change is observed on a frequency axis.

As described above, according to the configuration of the subscriber detection apparatus 20 according to an embodiment of the present invention, bending of an optical line in an IPTV service environment in which an FTTH (Fiber To The Home)-based optical subscriber network is configured. Through the method of analyzing the optical signal scattered from the access section, it is possible to determine the existence of a subscriber modem connected to the optical line without stopping the service to the subscriber. environment can be provided.

Hereinafter, an operation flow in the subscriber detection apparatus 20 according to an embodiment of the present invention will be described with reference to FIG. 7 .

First, the detector 21 detects an optical signal scattered in a bending connection section of the optical line through a bending connection to the optical line ( S10 - S20 ).

At this time, the detection unit 21 detects a first detection path for detecting any one of an upstream signal and a downstream signal with respect to the bending connection section of the optical line, and the first detection path. The optical signal may be detected through each detection path formed by forming a second detection path for detecting the remaining signals except for the detected signal.

Referring to FIG. 3 as illustrated above, in the bending connection section of the optical line, the upstream signal is received through the first photodiode PD1 at a position opposite to the transmission direction of the upstream signal. The optical signal by forming the path (a) and the second detection path (b) through which the downstream signal is received through the second photodiode PD2 at a position opposite to the transmission direction of the downstream signal can be detected.

If, according to the bending connection direction of the optical line, the position opposite to the transmission direction of the upstream signal and the downstream signal is opposite to the above example, the first photodiode PD1 is Of course, it is possible to form a first detection path (a) through which a downstream signal is received and a second detection path (b) through which an upstream signal is received through the second photodiode (PD2).

Furthermore, when the optical signal is detected in the bending connection section of the optical line, the extraction unit 22 samples the detected optical signal and extracts the data signal transmitted through the optical signal (S30-S40).

At this time, the extraction unit 22 selects any one of the first detection path and the second detection path, and performs sampling only on the optical signal detected through the selected detection path, which is the first detection path or It may be understood to extract an upstream signal that can be detected through the second detection path.

That is, the extraction unit 22 extracts only the upstream signal transmitted from the subscriber modem 30 among the upstream signal and the downstream signal transmitted through the optical line, for example, a user selection or a first detection path and a second detection path. Any one of the first detection path and the second detection path is selected according to the frequency characteristic of the optical signal detected through , and only the optical signal detected through the selected detection path is sampled.

On the other hand, in extracting the data signal, the extractor 22 applies the data signal transmitted through the optical signal to the time axis as shown in FIG. By extracting the signal waveform from which the level change is observed, the presence or absence of the subscriber modem 30 can be determined from the extracted signal waveform.

Then, when the signal waveform in which the level change is observed with respect to the time axis is extracted, the extraction unit 22 checks whether the existence of the subscriber modem 30 can be determined from the extraction result (S50).

At this time, the extraction unit 22 extracts the signal waveform in which the level change is observed with respect to the time axis, and as a result of extracting the signal waveform, as in FIG. When the magnitude of the noise N is greater than or equal to the threshold, it can be confirmed that the presence or absence of the subscriber modem 30 cannot be determined from the signal waveform in which the level change is observed with respect to the time axis.

In contrast, when it is impossible to determine the existence of the subscriber modem 30 from the signal waveform in which the level change is observed with respect to the time axis, the extracting unit 22 performs time The signal waveform in which the level change is observed on the axis is converted into the signal waveform in which the level change is observed in the frequency axis, so that the presence or absence of the subscriber modem 30 connected to the optical line can be determined from the converted signal waveform. (S60-S70).

Furthermore, when the data signal is extracted from the optical signal detected in the bending connection section of the line, the determining unit 23 determines whether or not the subscriber modem 30 is connected to the optical line based on the extracted value of the data signal. do (S80).

At this time, when a signal waveform whose level change is observed on the time axis is extracted from the detected optical signal, the determining unit 23 determines that the period T of the signal waveform is the period of the upstream signal transmitted from the subscriber side and the period T of the signal waveform. It is checked whether or not it matches, and when it is confirmed that the period of the upstream signal is matched as a result of the check, it can be determined that the subscriber modem 30 connected to the optical line exists.

On the other hand, in the case where the signal waveform in which the level change is observed with respect to the time axis is converted into the signal waveform in which the level change is observed with respect to the frequency axis, the determining unit 23 determines the level of the signal waveform in which the level change is observed with respect to the frequency axis. It is checked whether the frequency distribution diagram matches the frequency distribution diagram of the upstream signal transmitted from the subscriber side. can be discerned.

Here, the frequency distribution diagram, which is a reference for determining whether the subscriber modem 30 is present, may be understood as, for example, a level summation value of a signal waveform in which a change is observed on a frequency axis.

As described above, according to the operation method of the subscriber detection apparatus 20 according to an embodiment of the present invention, bending of an optical line in an IPTV service environment in which a Fiber To The Home (FTTH)-based optical subscriber network is configured ) Through the method of analyzing the optical signal scattered from the access section, it is possible to determine the existence of a subscriber modem connected to the optical line without stopping the service to the subscriber. A service environment can be provided.

On the other hand, the functional operations and implementations of the subject matter described in this specification are implemented as digital electronic circuits, computer software, firmware, or hardware including the structures disclosed in this specification and structural equivalents thereof, or at least one of these It can be implemented by combining. Implementations of the subject matter described herein are one or more computer program products, ie, one or more modules of computer program instructions encoded on a tangible program storage medium for controlling the operation of or for execution by a control system. can be implemented.

The computer readable medium may be a machine readable storage device, a machine readable storage substrate, a memory device, a composition of matter that affects a machine readable radio wave signal, or a combination of one or more thereof.

As used herein, the term “system” or “device” encompasses all devices, devices and machines for controlling data, including, for example, a programmable processor, a computer, or multiple processors or computers. The control system may include, in addition to hardware, code forming an execution environment for a computer program upon request, such as, for example, code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more thereof. .

A computer program (also known as a program, software, software application, script or code) may be written in any form of a programming language, including compiled or interpreted language or a priori or procedural language, and may be written as a stand-alone program or module; It can be deployed in any form, including components, subroutines, or other units suitable for use in a computer environment. A computer program does not necessarily correspond to a file in a file system. A program may be in a single file provided to the requested program, or in multiple interacting files (eg, files that store one or more modules, subprograms, or portions of code), or portions of files that hold other programs or data. (eg, one or more scripts stored within a markup language document). The computer program may be deployed to be executed on a single computer or multiple computers located at one site or distributed over a plurality of sites and interconnected by a communication network.

On the other hand, computer-readable media suitable for storing computer program instructions and data include, for example, semiconductor memory devices such as EPROM, EEPROM and flash memory devices, such as magnetic disks such as internal hard disks or external disks, magneto-optical disks and CDs. -Can include all types of non-volatile memory, media and memory devices, including ROM and DVD-ROM disks. The processor and memory may be supplemented by, or integrated into, special purpose logic circuitry.

Implementations of the subject matter described herein may include a backend component, such as a data server, or a middleware component, such as an application server, such as a web browser or graphical user that allows a user to interact with an implementation of the subject matter described herein, for example. It may be implemented in a front-end component, such as a client computer having an interface, or in a computing system including any combination of one or more of such back-end, middleware, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication, such as, for example, a communication network.

While this specification contains numerous specific implementation details, they should not be construed as limitations on the scope of any invention or claim, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. should be understood Likewise, certain features that are described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Furthermore, although features operate in a particular combination and may be initially depicted as claimed as such, one or more features from a claimed combination may in some cases be excluded from the combination, the claimed combination being a sub-combination. or a variant of a sub-combination.

Also, although operations are depicted in the drawings in a specific order herein, it is not to be understood that such operations must be performed in the specific order or sequential order shown or that all illustrated operations must be performed in order to achieve desirable results. Can not be done. In certain cases, multitasking and parallel processing may be advantageous. Further, the separation of the various system components of the above-described embodiments should not be construed as requiring such separation in all embodiments, and the program components and systems described may generally be integrated together into a single software product or packaged into multiple software products. It should be understood that

As such, this specification is not intended to limit the invention to the specific terminology presented. Accordingly, although the present invention has been described in detail with reference to the above-described examples, those skilled in the art can make modifications, changes, and modifications to the examples without departing from the scope of the present invention. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

According to the subscriber detection apparatus and the operation method according to the present invention, the optical signal scattered from the bending connection section of the optical line is analyzed in the IPTV service environment in which the FTTH (Fiber To The Home)-based optical subscriber network is configured. In that it is possible to determine the presence or absence of a subscriber modem connected to an optical line, as it goes beyond the limits of existing technologies, the possibility of marketing or sales of the applied device, not just the use of the related technology, is sufficient as well as realistically and clearly. It is an invention with industrial applicability because it can be implemented.

10: optical fiber termination device
20: subscriber detection device
21: detection unit 22: extraction unit
23: discrimination unit
30: subscriber modem

Claims (18)

a detection unit configured to detect an optical signal scattered in a bending connection section of the optical line through a bending connection to the optical line;
an extractor for sampling the optical signal and extracting a data signal transmitted through the optical signal; and
and a judging unit for judging whether or not there is a subscriber modem connected to the optical line based on the extracted value of the data signal. The method of claim 1,
The detection unit,
A first detection path for detecting any one of an upstream signal and a downstream signal with respect to the bending connection section of the optical line, and a signal detected in the first detection path A subscriber detection apparatus, characterized in that the optical signal is detected by forming a second detection path for detecting the signal. 3. The method of claim 2,
The extraction unit,
and selecting any one of the first detection path and the second detection path, and performing sampling only on the optical signal detected through the selected detection path. The method of claim 1,
The extraction unit,
A subscriber detection apparatus, characterized in that through time-division sampling of the optical signal, the data signal transmitted through the optical signal is extracted as a signal waveform in which a level change is observed with respect to a time axis. 5. The method of claim 4,
The determining unit,
When the period of the signal waveform at which the level change is observed with respect to the time axis matches the period of the upstream signal transmitted from the subscriber side, it is determined that there is a subscriber modem connected to the optical line. subscriber detection device. 5. The method of claim 4,
The extraction unit,
By converting the signal waveform in which the level change is observed on the time axis to the signal waveform in which the level change is observed on the frequency axis, the presence or absence of the subscriber modem connected to the optical line can be determined from the converted signal waveform. Subscriber detection device, characterized in that. 7. The method of claim 6,
The extraction unit,
The subscriber detection apparatus according to claim 1, wherein when the noise level carried on the signal waveform in which the level change is observed on the time axis exceeds a threshold, it is converted into a signal waveform in which the level change is observed on the frequency axis. 7. The method of claim 6,
The determining unit,
When the frequency distribution of the signal waveform in which the level change is observed on the frequency axis matches the frequency distribution of the upstream signal transmitted from the subscriber side, it is determined that there is a subscriber modem connected to the optical line. Subscriber detection device characterized by the. 9. The method of claim 8,
The frequency distribution diagram is
The subscriber detection device, characterized in that it includes the level summation value of the signal waveform observed to change with respect to the frequency axis. a detecting step of detecting an optical signal scattered in a bending connection section of the optical line through a bending connection to the optical line;
an extraction step of sampling the optical signal and extracting a data signal transmitted through the optical signal; and
and a determining step of determining whether a subscriber modem connected to the optical line exists or not based on the extracted value of the data signal. 11. The method of claim 10,
The detection step is
A first detection path for detecting any one of an upstream signal and a downstream signal with respect to the bending connection section of the optical line, and a signal detected in the first detection path A method of operating a subscriber detection apparatus, characterized in that the optical signal is detected by forming a second detection path for detecting the signal. 12. The method of claim 11,
The extraction step is
and selecting one of the first detection path and the second detection path, and performing sampling on only the optical signal detected through the selected detection path. 11. The method of claim 10,
The extraction step is
A method of operating a subscriber detection apparatus, characterized in that by time-division sampling of the optical signal, the data signal transmitted through the optical signal is extracted as a signal waveform in which a level change is observed with respect to a time axis. 14. The method of claim 13,
The determination step is
When the period of the signal waveform at which the level change is observed with respect to the time axis matches the period of the upstream signal transmitted from the subscriber side, it is determined that there is a subscriber modem connected to the optical line. operation method of the subscriber detection device. 14. The method of claim 13,
The extraction step is
By converting the signal waveform in which the level change is observed on the time axis to the signal waveform in which the level change is observed on the frequency axis, the presence or absence of the subscriber modem connected to the optical line can be determined from the converted signal waveform. A method of operating a subscriber detection device, characterized in that. 16. The method of claim 15,
The extraction step is
The method of operating a subscriber detection apparatus, characterized in that, when the noise level carried in the signal waveform in which the level change is observed with respect to the time axis exceeds a threshold, it is converted into a signal waveform in which the level change is observed with respect to the frequency axis. 16. The method of claim 15,
The determination step is
When the frequency distribution of the signal waveform in which the level change is observed on the frequency axis matches the frequency distribution of the upstream signal transmitted from the subscriber side, it is determined that there is a subscriber modem connected to the optical line. A method of operating a subscriber detection device, characterized in that. 18. The method of claim 17,
The frequency distribution diagram is
The method of operating a subscriber detection device, characterized in that it includes the level summation value of the signal waveform whose change is observed on the frequency axis.

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