KR101546035B1 - Realtime optical network monitoring system based resource sharing - Google Patents

Abstract

The present invention relates to a real-time optical network monitoring system based on resource sharing, in which, in an environment in which a plurality of measurement modules for collecting and storing reflection light information for a plurality of monitoring unit groups in an OTDR system are installed on an optical network, Wherein the control module controls the metering module through communication with the plurality of metering modules, receives the reflected light information stored by the metering module, and uses the provided reflected light information to determine the area covered by the plurality of metering modules And a monitoring server for monitoring the plurality of monitoring unit groups.

Description

REALTIME OPTICAL NETWORK MONITORING SYSTEM BASED RESOURCE SHARING [0002]

The present invention relates to a resource sharing based optical network monitoring system.

An important communication medium in optical communication is an optical cable. Even if it is a good equipment, if only one of hundreds of kilometers is cut off, billions of equipment is completely useless. Therefore, there is a need for an operation monitoring technique for an optical cable in order to maintain a normal communication state. At present, OTDR is mainly used as an optical cable monitoring technology. The OTDR (Optical Time Domain Reflectometer) inputs the test light to the measured fiber and detects fresnel reflections at the break point or rayleigh scattering in the optical fiber, And a method of measuring a failure point or loss characteristics. The OTDR method is most widely used to monitor optical fiber cables because it can find the presence or absence of an optical fiber and the distance to an abnormal point.

In this regard, Korean Patent Publication No. 2011-0061254 (filed by Keitai Co., Ltd., name of the invention: optical line monitoring apparatus and monitoring method in a passive optical network) is applied to a passive optical network (PON) Discloses an optical line monitoring apparatus and a monitoring method for detecting a fault location. Specifically, Korean Patent Laid-Open Publication No. 2011-0061254 discloses a state information extraction unit for extracting state information of units and an MAC (Media Access Control) address as an identifier of the light unit, A network management unit for extracting a MAC address of the optical network unit estimated to have failed by using the status information of the optical network units, and a control unit for receiving the MAC address of the optical network unit extracted from the network management unit and connected to the optical network unit A monitoring section for generating a monitoring light according to a measurement command of a control section and a control section for generating a failure point measurement command of an optical line and for inputting a monitoring light to a downward optical line port of the optical line terminating device and receiving the reflected light reflected by the failure point of the optical line; And an optical line monitoring apparatus including the optical line monitoring unit.

Korean Patent Laid-Open No. 2011-0061254, however, disadvantageously reduces the monitoring speed and wastes the resources required for the monitoring because the data for monitoring the status of the optical fiber unit and the data used for measuring the failure point are biased there was.

In addition, Korean Patent Laid-Open Publication No. 2011-0061254 can not perform a maintenance operation even after an abnormal state occurs, and thus the communication state of the corresponding optical line is inevitably maintained from the detection of the abnormal state to the completion of the repair. Therefore, the optical network monitoring system according to Korean Patent Publication No. 2011-0061254 has a problem that the optical network reliability is degraded.

Accordingly, it is an object of the present invention to provide a real-time optical network surveillance system based on a resource sharing which can improve a monitoring speed of an optical network and minimize a waste of resources required for monitoring.

It is another object of the present invention to provide a real-time optical network surveillance system based on resource sharing in which an abnormality of an optical path can be predicted even before an abnormal state occurs.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided a real-time optical network monitoring system based on resource sharing, comprising: a plurality of measurement modules for collecting and storing reflection light information for a plurality of monitoring unit groups in an OTDR system; A system for monitoring a real-time optical network in an environment installed on a network, the system comprising: a control unit for controlling the measurement module through communication with the plurality of measurement modules, receiving reflected light information stored by the measurement module, And a monitoring server for monitoring a plurality of monitoring unit groups for each of the plurality of measurement modules using information.

Here, the surveillance server can perform the determination of whether or not an event exists in the monitoring unit group and the abnormality determination in the monitoring unit group using the reflected light information provided from the measurement module.

The monitoring server searches for a library matched to the first measurement module among a plurality of libraries when controlling the first measurement module among the plurality of measurement modules and controls the first measurement module using the searched library, The library may include a control function having a standardized name compatible with the metrology module.

The monitoring server may record an error with respect to the reference waveform for each interval using the reflected light information at each monitoring period, and predict the abnormality of the plurality of monitoring unit groups using the recorded error over time.

In addition, if the error between the reference waveform and the reference waveform exceeds the reference error over the monitoring period, and the error continuously increases during the predetermined period after the monitoring period, An alarm can be provided to the outside.

As described above, the present invention mounts the measurement function and the monitoring function in separate modules, the measurement module performs only the measurement operation, and the monitoring module performs only the monitoring function using the measurement data of the measurement module. In such a structure, the monitoring module can unify the data used by determining whether there is an event in the monitoring unit group and determining whether there is an abnormality in the monitoring unit group using the reflected light information provided by the measurement module. Thereby, it is possible to improve the optical network monitoring speed and to minimize the waste of resources required for monitoring.

Further, the present invention can predict an abnormality using an aged change of reflected light. Therefore, it is possible to prevent the optical communication from being paralyzed until the system is recovered after the occurrence of the optical cable abnormality.

In addition, the present invention minimizes the cost of constructing a surveillance system through a structure in which a plurality of measurement modules share a diagnostic module on a server.

In addition, the present invention can minimize the system construction cost by constructing a surveillance system using idle optical fiber lines on an optical network in a ring topology optical network surveillance system.

1 shows a schematic diagram of an optical network monitoring system of the present invention.
Fig. 2 shows a functional block diagram of the monitoring device of Fig. 1. Fig.
Figure 3 shows information stored on the metrology module.
Figure 4 shows a functional block diagram of the monitoring module of Figure 2;
5 is a schematic diagram of an optical network monitoring system according to another embodiment of the present invention.
6 is a schematic diagram of an optical network monitoring system according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, a real-time optical network monitoring system according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 4 attached hereto.

1 shows a schematic diagram of an optical network monitoring system of the present invention. Fig. 2 shows a functional block diagram of the monitoring device of Fig. 1. Fig. Figure 3 shows information stored on the metrology module. Figure 4 shows a functional block diagram of the monitoring module of Figure 2; For the sake of convenience of explanation, the description of the conventionally known matters will be omitted or simplified.

Referring to FIG. 1, an optical network monitoring system includes an optical network of a tree topology. More specifically, the optical network monitoring system includes a communication optical line 110 for transmitting a communication optical signal including a plurality of wavelengths according to a WDM (Wavelength Division Multiplexing) scheme, a plurality of remote nodes (primary RN, ..., Splitters 120 and 130 installed in the respective upper nodes and distributing the light received from the upper node to a plurality of lower nodes and optical network terminals (hereinafter referred to as " ONTs ") for performing optical communication through optical paths .

In the present invention, the optical network to be monitored can be divided into monitoring unit groups G1, ..., Gn. The present invention can simultaneously monitor a plurality of optical lines included in each of the monitoring unit groups.

To this end, the optical network monitoring system may include a WDM module 2100 on the communication optical path 110. The WDM module 2100 may be installed on the appropriate top node on the tri-topology. The present invention does not limit the installation position of the WDM module 2100. [ The WDM module 2100 can multiplex the test light and the communication light to be irradiated on the optical line for monitoring according to the OTDR method. If the test light propagates to the lower node and is expressed differently, the reflected light can be separated from the communication light and transmitted to the monitoring apparatus side. A plurality of WDM modules 2100 may be included in one monitoring unit group. The monitoring system may include a test light splitter 2200 for distributing the test light to a plurality of WDM modules 2100 included in the monitoring unit group to be monitored. The test light splitter 2200 may be provided for each monitoring unit group. The optical switch module 2300 may be optically connected to the test light splitter 2200 provided for each monitoring unit group. Also, any one of the monitoring device 2400 and the test light splitter 2200 provided for each monitoring unit group can be selectively optically connected through the switching operation according to the control signal. That is, the optical switch module 2300 can serve to identify the monitoring target monitoring unit group.

The monitoring device 2400 can monitor the optical network using the test light.

Referring to FIG. 2, the monitoring apparatus 2400 may include a measurement module 2410 and a monitoring module 2420. The monitoring apparatus 2400 can be installed at a plurality of locations on the monitored optical network. The measurement module 2410 and the monitoring module 2420 may be independent modules. The measurement module 2410 may be manufactured separately from the monitoring module 2420. The measurement module 2410 may have an interface for interfacing with the monitoring module 2420. Through the interface, the metrology module 2410 may operate in response to a command from the monitoring module 2420. The measurement module 2410 and the monitoring module 2420 can communicate with each other via a LAN or USB. The communication protocol between the measurement module 2410 and the monitoring module 2420 can be easily changed according to the designer.

The measurement module 2410 transmits the test light to the plurality of communication light beams 231 in the selected monitoring target monitoring unit group G1, ..., Gn through the optical switch 2300, the test light splitter 2200, The test light can be irradiated to the furnace 110. The measurement module 2410 can control the switching of the optical switch panel 2300 in order to selectively irradiate the test light to any of the monitoring target monitoring unit groups G1, ..., Gn. The measurement module 2410 can irradiate test light to a plurality of monitoring unit groups at a predetermined cycle and collect the reflected light information for each monitoring unit group. Alternatively, the reflected light information collecting operation (or the measuring operation) may be performed according to an instruction from the monitoring module 2420. [ Here, the test light may be a single wavelength (Branch Length Trimming method) or may be a multiple wavelength (wavelength routing method). The measurement module 2410 may have only functions of measurement and storage.

The reflected light for each monitoring unit group may differ depending on the state of the optical line in the monitoring unit group. As is well known, the reflected light may have the form of an excessive signal decrease or an excessive signal increase in the fault section.

3, the measurement module 2410 scans the collected reflected light to determine whether there is an event corresponding to the optical line in each of the monitoring unit groups (here, the event indicates an abnormal symptom) (Event information) can be recorded, and waveform information (reflected wave information) for each monitoring unit group can be stored. In some cases, the measurement module 2410 may store only waveform information for each module to be monitored, and may not determine whether there is an event. The method of determining the presence or absence of an event may differ depending on the measurement module manufacturer. For example, if there is an interval in which the signal reduction rate of the reference waveform is greater than a preset value, it can be determined that an event has occurred.

Referring to FIG. 4, the monitoring module 2420 may include a monitoring unit 2421, a library unit 2422, and a setting unit 2423. The monitoring unit 2421 can execute a function included in the library unit 2422 to perform a monitoring operation. The library unit 2422 may include a plurality of functions having a plurality of standardized function names used for the monitoring operation of the monitoring module 2420, as shown in Table 1 below.

function Function name Start measurement StartTest End of measurement EndTest Read Event ReadEvent Read Waveform ReadTrace

The manufacturer of the monitoring apparatus of the present invention provides a library having the standardized function name as described above, for example, Expo.dll, RTdll, and Ando.dll for each measurement module manufacturer, The library unit 2422 can be set as a library. In this manner, the manufacturer of the monitoring device may be able to produce a monitoring module that is compatible with the metrology module manufactured by various manufacturers through standardized function names. Variables and commands included in the function name may have different forms depending on the manufacturer.

The monitoring unit 2421 can use the measurement start function (StartTest) to command the start of measurement of the measurement module. At this time, the measurement module 2410 can obtain the reflected wave information for a plurality of monitoring unit groups as described above. The reflected wave information may be a distance / signal magnitude graph.

The monitoring unit 2421 can terminate the measurement operation of the measurement module 2410 using the measurement end function (EndTest).

The monitoring unit 2421 can use the Event Read function (ReadEvent) to read the event information for each optical line stored in the measurement module 2410 from the measurement module 2410.

The monitoring unit 2421 can read the reflected wave information for each monitoring unit group from the measurement module 2410 using a waveform read function (Read Trace).

As a result of reading the event information for each optical line, the monitoring module 2421 can read the waveform information in which the event exists, and perform detailed diagnosis. The detailed diagnosis can be performed by comparing a previously stored reference waveform with a waveform in which an event exists, specifying an interval exceeding a predetermined error, and calculating a distance from the monitoring apparatus to an interval exceeding the error.

In parallel with this method or in place of this method, the monitoring module 2421 can predict the occurrence of an abnormality of the optical path by utilizing the aging of the waveform. To this end, the monitoring module 2421 reads the waveform from the measurement module 2410 regardless of the presence or absence of an event, compares the waveform with the reference waveform, and calculates the error between the waveform read by the measurement module 2410 and the reference waveform Can be recorded for each section. Then, the change of the error can be recorded by the monitoring period. At this time, the monitoring module 2421 can predict an abnormality of the monitoring unit group by using the variation pattern of the interval error according to the recorded monitoring period. For example, if the monitoring module 2421 detects an error over a predetermined period of time after exceeding a reference error by a monitoring period, An external alarm can be provided. In this manner, reliability of the optical network monitoring can be improved by predicting an abnormal symptom using an aging pattern of a waveform that is not an instantaneous waveform. Of course, the monitoring module 2421 may display the aging of the error in the interval when the operator observes the waveform acquired through the current monitoring operation and selects a point at which the abnormality symptom is predicted.

It goes without saying that the monitoring apparatus of Fig. 1 can also be applied to a ring topology optical network. At this time, a monitoring apparatus is provided for each communication link unit section on the ring topology, and each of the monitoring apparatuses can monitor at least one of unidirectional and bidirectional. The operation of the monitoring device installed on the ring topology may be the same as that of the monitoring device of FIG.

Hereinafter, a real-time optical network monitoring system according to another embodiment of the present invention will be described with reference to FIG. 1 to FIG. Hereinafter, the description of the duplicated matters will be omitted or simplified. 5 is a schematic diagram of an optical network monitoring system according to another embodiment of the present invention.

Referring to FIG. 5, the optical network monitoring system may include a plurality of measurement modules 2400a and a monitoring server 3000. Each of the plurality of measurement modules 2400a may be installed on the optical network in the same manner as in FIG. 1, an optical switch module, a test light splitter, and a WDM module may be disposed between each of the measurement modules 2400a and the optical network.

Each of the plurality of measurement modules 2400a is independently provided at a proper position of the optical network, and as shown in FIG. 1, it is possible to obtain the reflected wave information for a plurality of monitoring unit groups to be monitored. The reflected wave information may be a reflected light intensity along the distance. The operation of the plurality of measurement modules 2400a may be the same as that of the measurement module of FIG.

The monitoring server 3000 can communicate with the measuring module 2400a via the communication network 4000 and obtain event information, reflected wave information, and the like from the measuring module 2400a. Here, the protocol of the communication network is not limited, and TCP / IP may be used as the communication protocol.

The monitoring server 3000 may include a monitoring module 3100.

The monitoring module 3100 can perform a monitoring operation on the optical network using the event information and the reflected wave information from the plurality of measurement modules 2400a. The event information and the reflected wave information may be transmitted from the plurality of measurement modules 2400a to the monitoring module 3100 at a predetermined timing. Alternatively, in the case where the measurement module 2400a acquires the reflected wave information according to an instruction from the monitoring module 3100 and transmits the reflected wave information and the event information to the monitoring module 3100, Each of the measurement modules can be controlled according to a function included in the library. Expo.dll, RTdll, and Ando.dll are provided on the monitoring module 3100, and each library is composed of a function having a standardized function name as shown in Table 1 . To this end, the monitoring module includes library identification information for each of the plurality of measurement modules 2400a. When it is desired to control any one of the plurality of measurement modules 2400a, the monitoring module selects a library of the measurement module, The selected library can be used to control the measurement module that is the control target.

According to this method, if a plurality of measurement modules are provided at appropriate positions in the optical network and only a library corresponding to the identification information of each measurement module is provided, the optical network monitoring The system can be constructed. In addition, since the plurality of measurement modules share a monitoring module connected through a communication network, the construction cost of the optical network monitoring system can be minimized.

Except for the case where the monitoring module selects a plurality of libraries, control of the measurement module using the functions on the selected library is as described above. Specifically, the monitoring module 3100 can use the measurement start function (StartTest) to command the start of measurement of the measurement module. At this time, the measurement module 2400a can obtain the reflected wave information for a plurality of monitoring unit groups as described above. The reflected wave information may be a distance / signal magnitude graph.

The monitoring module 3100 can terminate the measurement operation of the measurement module 2400a using the measurement end function (EndTest).

The monitoring module 3100 can read event information for each optical line stored in the measuring module 2400a from the measuring module 2400a using an event reading function (ReadEvent).

Also, the monitoring module 3100 can read the reflected wave information for each monitoring unit group from the measuring module 2400a using a waveform read function (Read Trace).

As a result of reading the event information for each optical line, the monitoring module 3100 can read the waveform information in which the event is present from the measurement module 2400a to perform detailed diagnosis. The detailed diagnosis can be performed by comparing a previously stored reference waveform with a waveform in which an event exists, specifying an interval exceeding a predetermined error, and calculating a distance from the diagnostic apparatus to an interval exceeding the error.

In parallel with or in lieu of this scheme, the monitoring module 3100 can predict the occurrence of anomalies in the optical path using the aging of the waveform. To this end, the monitoring module 3100 reads the waveform from the measurement module 2400a regardless of the presence or absence of an event, compares the waveform with the reference waveform, and calculates the error between the waveform read by the measurement module 2400a and the reference waveform Can be recorded for each section. Then, the change of the error can be recorded by the monitoring period. At this time, the monitoring module 3100 can predict an abnormality of the monitoring unit group using the variation pattern of the interval error according to the recorded monitoring period. For example, the monitoring module 3100 may be configured such that, if the interval error according to the monitoring period exceeds the reference error and the error continuously increases pattern over the predetermined period after the error, An external alarm can be provided. In this manner, reliability of the optical network monitoring can be improved by predicting an abnormal symptom using an aging pattern of a waveform that is not an instantaneous waveform. Of course, the monitoring module 3100 may display the aging of the error in the interval when the operator observes the waveform acquired through the current monitoring operation and selects a point at which the anomaly is predicted.

Hereinafter, a real-time optical network monitoring system according to another embodiment of the present invention will be described with reference to FIG. 6 is a schematic diagram of an optical network monitoring system according to another embodiment of the present invention. The description of the foregoing is omitted or simplified.

Referring to FIG. 6, the optical network to which the optical network monitoring system is applied may be a ring topology. The measurement module 2400b may be installed for each of the communication link unit sections S1, S2, S3, S4 partitioned by the optical transmission device 11. [ The number of communication link unit intervals S1, S2, S3, and S4 may be variable. The operation of each of the measurement modules 2400b may be the same as that of the measurement module of Fig. Each of the measurement modules 2400b can perform communication with the monitoring server 3000a. The monitoring server 3000a may include a monitoring module 3100a. The details of the monitoring module 3100a may be the same as that of the monitoring module of FIG. The optical network monitoring system of FIG. 6 may differ only in the optical network topology out of the applicable communication method. In FIG. 5, if the communication between the measurement module and the monitoring server is performed by the TCP / IP method, the communication between the monitoring server 3000a and the measurement module 2400b can be performed using a communication method in which optical communication and TCP / have. A media converter 15 may be provided between the measurement module 2400b and the optical network 1 and between the optical network 1 and the monitoring server 3000a. The media converter 15 can convert a packet transmitted and received between the measurement module 2400b and the monitoring server 3000a from the TCP / IP packet type to the optical signal type or from the optical signal type to the TCP / IP packet type. The media converter installed on the measurement module 2400b side and the media converter installed on the monitoring server side can perform communication using the idle optical fiber 13 on the ring topology optical network 1. [ This makes it possible to easily construct a LAN-type surveillance system using an optical network and a media converter without having to allocate a public IP when constructing a surveillance system.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

S1, S2, S3, S4: Communication link unit section
11: Optical transmission device
13: idle optical core wire
15: Media Converter
110: Communication light path
120, 130: splitter
140: Optical network terminal
2100: WDM module
2200: Test light splitter
2300: Optical switch half
2400: Monitoring device
2410, 2400a, 2400b: Measurement module
2420: Monitoring module
2421:
2422: library section
2423:
3000, 3000a: Surveillance Server
3100, 3100a: Monitoring module
4000: Network

Claims (5)

A system for monitoring a real-time optical network in an environment in which a plurality of measurement modules for collecting and storing reflection light information for a plurality of monitoring unit groups in an OTDR system are installed on an optical network,
Wherein the control unit controls the measurement module through communication with the plurality of measurement modules, receives the reflected light information stored in the measurement module, and uses the provided reflected light information to detect a plurality of monitoring units And a monitoring server for monitoring the group,
The monitoring server includes:
Wherein the control unit searches for a library matched to the first measurement module among a plurality of libraries when controlling the first measurement module among the plurality of measurement modules and controls the first measurement module using the searched library,
Wherein the plurality of libraries have a function name standardized for each measurement module manufacturer and the function name includes instructions for starting measurement, reading event information in the monitoring unit group, reading reflected wave information for each monitoring unit group,
The monitoring server includes:
An error with respect to a reference waveform for each interval is recorded using the reflected light information for each monitoring period by executing a command included in a matching library and the error between the reference waveform and the reference waveform for each interval exceeds the reference error, Wherein an alarm is provided to the outside about the possibility of an abnormality occurring in the section when the error increasing pattern continuously appears during the predetermined time. The method according to claim 1,
Wherein the monitoring server performs the determination of whether or not an event occurs in the monitoring unit group and the abnormality determination in the monitoring unit group using the reflected light information provided from the measurement module. delete delete delete

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