KR20150003602A - Apparatus and method for optical cable status supervision - Google Patents

Apparatus and method for optical cable status supervision Download PDF

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Publication number
KR20150003602A
KR20150003602A KR20130076681A KR20130076681A KR20150003602A KR 20150003602 A KR20150003602 A KR 20150003602A KR 20130076681 A KR20130076681 A KR 20130076681A KR 20130076681 A KR20130076681 A KR 20130076681A KR 20150003602 A KR20150003602 A KR 20150003602A
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optical
information
unit
optical line
subscriber
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KR20130076681A
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Korean (ko)
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손의승
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주식회사 케이티
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Priority to KR20130076681A priority Critical patent/KR20150003602A/en
Priority to PCT/KR2014/005873 priority patent/WO2015002445A1/en
Publication of KR20150003602A publication Critical patent/KR20150003602A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0775—Performance monitoring and measurement of transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

In order to monitor the optical line, the optical line status monitoring device, which is interworked with the subscriber device and the network management system, collects diagnostic information of the subscriber device diagnostic information and the optical line status monitoring device itself from the subscriber device, Calculate optical path loss between state monitoring devices. The calculated loss of light ray value is compared with the light ray loss value calculated at the previous time point to check whether the change of the light ray loss is out of a predetermined reference value and if the light ray loss value is out of a preset reference value, The optical line loss between the subscriber unit and the optical line condition monitoring apparatus is checked, and the change of the optical line condition is analyzed.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical cable status supervision apparatus,

The present invention relates to an apparatus and method for monitoring a light path condition.

Recently, as the demand for various data services and multimedia services such as the Internet has increased rapidly, there has been a need for increasing the transmission capacity in the subscriber network. As a solution to this demand, optical access network technology applying optical communication technology to a subscriber network is widely used at home and abroad.

Particularly, a passive optical network (PON), which is a passive optical network, accommodates a large number of subscribers by using a passive optical splitter located at a local node, thereby achieving low cost and high performance. In addition, since only passive optical fiber is installed outside the country, it is the most widely used optical network technology in the world because it is easy to operate and manage.

When the optical path loss increases or a failure occurs in the PON, the communication quality between the optical line terminal (OLT) and the optical network unit (ONU) or optical network terminal (ONT) A serious situation may occur in which the service is interrupted due to deterioration or communication interruption. Therefore, it is very important for PON service quality to determine the loss, loss, optical loss, loss occurrence, failure occurrence, and failure occurrence period of the optical line.

In particular, when a phenomenon occurs in which the optical path is tightened or bent, the light beam loss gradually deteriorates and the PON service becomes unstable. Therefore, it is very important to detect the optical loss loss size and loss change in advance in order to provide stable PON service. However, conventionally, there is a problem that it is not possible to accurately determine the loss and loss changes occurring in the PON and the loss occurrence period.

Accordingly, the present invention provides an apparatus and method for monitoring the optical line status of a passive optical network using an optical module diagnostic function.

According to another aspect of the present invention, there is provided a method of monitoring an optical line in an optical line status monitoring apparatus interlocked with a subscriber unit and a network management system,

Collecting diagnostic information of the subscriber unit from the subscriber unit and diagnostic information of the national apparatus for the optical line status monitoring apparatus itself; Determining whether any one of the subscriber unit or the optical line condition monitoring apparatus has failed and calculating the optical line loss between the subscriber unit and the optical line condition monitoring apparatus if the failure has not occurred; Comparing the calculated light ray loss value with the light ray loss value calculated at the previous time point to confirm whether the light ray loss change is out of a preset reference value; And when the loss value of the optical path deviates from a preset reference value, it is checked whether a loss occurs in any section between the subscriber unit adjacent to the subscriber unit and the optical line condition monitoring apparatus, .

The step of analyzing the change of the optical line state includes the steps of requesting and receiving the subscriber unit diagnostic information from all adjacent subscriber units and checking whether there is a loss change on the optical line for all the adjacent subscriber units based on the received subscriber unit diagnostic information ; If there is no loss change on the optical line for all subscriber devices, checking if there is a loss change on the optical line for all subscriber devices connected to any local node; And determining that there has been a change in the optical path state at the lead-in line if there is no loss change in the optical line for all subscriber units connected to any local node.

If there is a loss change in the optical line for all the adjacent subscriber units, determining that a change in the optical line state occurs in the sub-line; And determining that a change in the state of the optical line has occurred in the power distribution line if there is a loss change in the optical line for all the subscriber devices connected to the certain local node.

Checking whether the power state of the subscriber unit is off before collecting the national apparatus diagnosis information; And stopping the optical line status monitoring if the power state of the subscriber unit is off.

The step of collecting the national apparatus diagnosis information may include receiving the reception power information of the subscriber unit and the transmission power information of the optical path condition monitoring apparatus.

The step of collecting the national apparatus diagnosis information may include receiving the transmission power information of the subscriber unit and the reception power information of the optical line condition monitoring apparatus.

The step of collecting the national apparatus diagnosis information may include receiving the reception power information and the transmission power information of the subscriber unit and the optical line condition monitoring apparatus, respectively.

According to another aspect of the present invention, there is provided an apparatus for monitoring a state of a light path in cooperation with a network management system and a subscriber apparatus,

And transmits and receives a message to and from the subscriber unit to receive the power status information and the subscriber unit diagnosis information of the subscriber unit, converts the electric signal into an optical signal and transmits the signal to the outside, An optical module for converting the signal into a signal and obtaining diagnosis information of the national apparatus; An optical network unit for extracting diagnostic information including the power status information, the subscriber unit diagnostic information, and the national apparatus diagnostic information from the message received by the optical module; And a controller configured to calculate a loss value for the optical line based on the diagnostic information extracted by the optical network unit, generate monitoring information indicating whether a failure occurs in a section of the optical line connected to the optical line, and transmit the generated monitoring information to the network management system And a monitoring unit.

The optical module includes: a transmitter for receiving an electrical signal from the optical network unit and converting the electrical signal into an optical signal; A receiver for converting an optical signal input from the outside into an electric signal and providing the converted electric signal to the optical network unit; A multiplexer for transmitting the optical signal converted by the transmitter to the outside of the optical module and transmitting the optical signal received from outside the optical module to the receiver; And a diagnostic unit for acquiring the electric signal intensity and the optical signal transmission intensity from the transmitter and the receiver to generate the diagnostic apparatus information for the optical module and providing the generated diagnosis apparatus diagnostic information to the optical network unit .

The subscriber unit comprising: an optical module connected to the optical line condition monitoring apparatus via a lead line and transmitting the subscriber unit diagnostic information to the optical line condition monitoring apparatus; An optical network unit for generating power status information and transmitting the power status information to the optical line status monitoring apparatus through the optical module when the power status of the subscriber unit changes from an on state to an off state; An interface unit for providing an interface for allowing a terminal to access a subscriber unit; And a control unit for controlling the optical module, the optical network unit, and the interface unit.

Wherein the network management system comprises: a communication unit connected to the optical line condition monitoring apparatus and receiving monitoring information from the optical line condition monitoring apparatus; Upon receiving the optical line status monitoring apparatus and the optical line status information and the subscriber unit diagnostic information, the optical line status information including the loss and loss change of the optical line, the loss occurrence period, the occurrence of the failure and the failure occurrence period information An optical line monitoring unit for providing information; A network manager for receiving the optical line status information from the optical line monitoring unit and providing the optical line status information to the terminal of the network manager; And a control unit for controlling the communication unit, the optical line monitoring unit, and the network management unit.

According to the present invention, loss information of an optical line connecting an OLT and an ONT or an OLT and an ONT is provided without a separate external device, loss information is provided when loss variation is large by monitoring loss change, It is possible to quickly identify the cause of the loss change before the occurrence and provide a before service.

In addition, in the case where a failure in which the optical line is disconnected occurs, it is possible to quickly recover from the failure by providing information on the occurrence of the failure and information on the failure occurrence region in real time.

1 is a diagram illustrating a structure of a general passive optical network.
FIG. 2 is a structural view of an earth moving apparatus according to an embodiment of the present invention.
3 is a structural diagram of a subscriber unit according to an embodiment of the present invention.
4 is a structural view of an optical module unit according to an embodiment of the present invention.
5 is a structural diagram of a network management system according to an embodiment of the present invention.
6 is a flowchart of a method of monitoring the state of an optical line according to an embodiment of the present invention.
FIG. 7 is an exemplary view illustrating information received for monitoring the state of an optical line according to the first embodiment of the present invention. FIG.
FIG. 8 is an exemplary view illustrating information received for monitoring the state of an optical line according to the second embodiment of the present invention.
FIG. 9 is an exemplary view illustrating information received for monitoring the state of an optical line according to the third embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) An access terminal (AT), and the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, and the like.

Hereinafter, an optical line condition monitoring apparatus and method according to an embodiment of the present invention will be described with reference to the drawings.

1 is a view illustrating an exemplary structure of a passive optical network according to an exemplary embodiment of the present invention.

1, an optical line terminal (OLT) 100 located at a national office is connected to a first local node (RN) 400 through a feeder line 300, . The first area node 400 is connected to the second area node 400 'through a distribution line 500 and the second area node 400' is connected to the subscriber line 400 ' And is connected to the apparatus 700.

Here, the subscriber unit 700 refers to any one of an optical network unit (ONU) or an optical network terminal (ONT). In the embodiment of the present invention, (700). The subscriber unit 700 is located at the subscriber terminal and only one of the first area node 400 and the second area node 400 'is installed according to the PON service environment.

The national office apparatus 100 collects and stores status information of the subscriber apparatus 700 and transmits operation / management information related to the status and the failure of the PON to the network management system (NMS) 200. The subscriber unit 700 transmits an OAM message to the home server 100 in a periodic manner according to a predetermined period or transmits an OAM message to the home server 100 at the request of the home server 100 And transmits it to the national station apparatus 100.

The network management system 200 analyzes the operation / management information of the PON received from the national device 100, and notifies the network operation / manager when an abnormal state is detected.

The optical network unit 100 and the subscriber unit 700 transmit and receive data or OAM messages through optical lines of the branch line 300, the distribution line 500 and the drop line 600, respectively, by using an optical transceiver do.

In the above environment, the structure of the national land apparatus 100 having the light path condition monitoring function will be described in detail with reference to FIG. In the embodiment of the present invention, the national office apparatus 100 is also referred to as a light-line state monitoring apparatus for convenience of explanation. In the embodiment of the present invention, the light path status is monitored by the national apparatus 100, but the network management system 200 can also monitor the light path status, but the present invention is not limited thereto.

FIG. 2 is a structural view of an earth moving apparatus according to an embodiment of the present invention.

2, the optical path switching device 100 includes an optical module 110, an optical network unit 120, a light path monitoring unit 130, and a control unit 140.

The optical module 110 is connected to the branch wiring 300 and transmits and receives data or OAM messages to and from the subscriber device 700. At this time, the OAM message includes power status information of the subscriber device 700 and subscriber device diagnostic information of the subscriber device 700. The power status information of the subscriber unit 700 and the subscriber unit diagnostic information are referred to as status information.

The optical module 110 converts an electrical signal into an optical signal and transmits the optical signal to the outside of the apparatus 100 or converts an optical signal received from the outside into an electrical signal. . Here, the power status information is information indicating whether the power of the subscriber unit 700 is ON or OFF, and the subscriber unit diagnostic information is information indicating the transmission power information and the reception power information of the subscriber unit 700 And the national office device diagnostic information includes transmission power information and received power information of the national apparatus 100. [

In addition to the connected subscriber device 700, it also receives subscriber device diagnostic information for neighboring subscriber devices. This is to confirm at what point the change of the optical path state occurs when the optical path loss between the subscriber unit 700 and the national apparatus 100 deviates from a preset reference value in comparison with the previous optical path loss.

The optical network unit 120 controls the point-to-multipoint structure of the PON and processes the transmission of data received through the optical module 110 and the OAM message. The OAM message is processed and provided to the optical line monitoring unit 130 by extracting the power status information of the subscriber unit 700, the subscriber unit diagnostic information, and the diagnosis apparatus information of the national apparatus 100. In the embodiment of the present invention, the power status information, the national apparatus diagnostic information, and the subscriber apparatus diagnostic information are referred to as diagnostic information for convenience of explanation.

Based on the diagnostic information received from the optical network unit 120, the optical line monitoring unit 130 generates and stores monitoring information on the loss of the optical line, loss change, loss occurrence period, failure occurrence occurrence, and failure occurrence period, Management. The monitoring information is transmitted to the network management system 200.

That is, the optical network unit 120 confirms the power status information among the diagnostic information and confirms that the current power status of the national apparatus 100 or the subscriber unit 700 is off, thereby ending the optical line status monitoring. Based on the diagnosis information of the national apparatus and the diagnosis information of the subscriber unit among the diagnosis information, it is monitored whether there is an abnormality in the optical path.

For this, the optical line monitoring unit 130 analyzes diagnosis information with respect to the subscriber apparatus 700 as well as neighboring subscriber apparatuses, and detects loss, loss, loss occurrence, failure occurrence, and failure occurrence period information of the optical line, And provides the confirmation result to the network management system 200. The method by which the optical line monitoring unit 130 analyzes the diagnostic information to calculate the optical line loss will be described in detail later.

The control unit 140 controls the national apparatus 100 including the optical module 110, the optical network unit 120, and the optical line monitoring unit 130.

The structure of the subscriber unit 700 connected to the national office apparatus 100 through the branch wiring, the distribution line, and the lead line will be described with reference to FIG. The subscriber device 700 according to the embodiment of the present invention may be any one of an ONU and an ONT, and is not described in detail.

3 is a structural diagram of a subscriber unit according to an embodiment of the present invention.

3, the subscriber device 700 includes an optical module 710, an optical network unit 720, an interface unit 730, and a control unit 740. [

The optical module 710 is connected to the home apparatus 100 through the lead line 600 and transmits and receives data or OAM messages to and from the home server 100. The state information of the optical module 710 is provided to the optical network unit 720 and the optical module 110 of the national device 100. The optical module 710 converts the electrical signal into an optical signal and transmits the optical signal to the outside or converts an optical signal received from the outside into an electrical signal. At this time, the optical module 710 transmits subscriber device diagnostic information of the subscriber device 700, 700 can be obtained.

The optical network unit 720 controls the point-to-multipoint structure of the PON and processes the transmission of data received through the optical module 710 and the OAM message. In addition, when the subscriber unit 700 itself checks optical line status or optical module status information, it provides status information on the optical module 710 to the control unit 740. When the power state of the subscriber unit 700 is changed from the ON state to the OFF state, the optical network unit 720 transmits an OAM message including the power state information of the subscriber unit to the home server 100 through the optical module 710 ).

The interface unit 730 provides an interface such that a terminal having an Internet connection function such as a PC can access the subscriber apparatus 700. The interface unit 730 may be Ethernet, xDSL, G.hn, WiFi, or the like, and is not limited to any one technology.

The control unit 740 controls the optical module 710, the optical network unit 720, and the interface unit 730.

Next, the structure of the optical module 110 included in the domestic apparatus 100 shown in FIGS. 2 and 3 and the optical module 710 included in the subscriber apparatus 700 will be described with reference to FIG. The structure of the optical module 110 included in the home server apparatus 100 and the structure of the optical module 710 included in the subscriber apparatus 700 will be described by taking an example having the same structure. Quot; 800 ".

4 is a structural view of an optical module according to an embodiment of the present invention.

4, the optical module 800 includes a multiplexer 810, a transmitter 820 receiver 830, and a diagnostic device 840.

The multiplexer 810 separates or combines optical signals having different wavelengths. For this purpose, the multiplexer 810 is implemented as a WDM (Wavelength Division Multiplexer).

The multiplexer 810 transmits the optical signal received through the transmitter 820 to the outside of the optical module 800 and transmits the optical signal received from the outside of the optical module 800 to the receiver 830. At this time, it is preferable that the optical signal generated by the transmitter 820 and the optical signal received by the receiver 840 have different wavelengths.

For example, in the case of a 1G-EPON domestic apparatus, the wavelength of the optical signal generated by the transmitter in the national apparatus is located between 1480 and 1500 nm, and the wavelength of the optical signal received by the receiver is located between 1260 and 1360 nm. In the case of the 1G-EPON subscriber unit, the optical signal generated by the transmitter generates a signal having a wavelength between 1260 and 1360 nm, and the optical signal received by the receiver has a wavelength between 1480 and 1500 nm.

In the case of a 10G-EPON domestic apparatus, the wavelength of the optical signal generated by the transmitter is located between 1575 and 1580 nm, and the wavelength of the optical signal received by the receiver is located between 1260 and 1280 nm. In the case of a 10G-EPON subscriber unit, the transmitter generates an optical signal having a wavelength between 1260 and 1280 nm, and a receiver receives an optical signal having a wavelength between 1575 and 1580 nm.

The transmitter 820 converts an electric signal received from the optical network units 120 and 720 into an optical signal and transmits the optical signal to the multiplexer 810. The receiver 830 converts the optical signal received from the multiplexer 810 into an electrical signal and provides it to the optical network units 120 and 720.

The diagnosis unit 840 receives the temperature of the optical module, the optical module supply voltage, the bias current of the transmitter 820, the transmission power of the transmitter 820, and the reception power of the receiver 830 from the transmitter 820 and the receiver 830 And receives diagnostic information about the optical module 800 and provides the diagnostic information to the optical network units 120 and 720.

Next, the structure of the network management system 200 connected to the national office apparatus 100 shown in FIG. 1 will be described with reference to FIG.

5 is a structural diagram of a network management system according to an embodiment of the present invention.

5, the network management system 200 includes a communication unit 210, a network management unit 220, an optical line monitoring unit 230, and a control unit 240. [

The communication unit 210 provides a data transmission / reception function with the national device 100, such as receiving surveillance information generated by the optical line monitoring unit 130 of the national apparatus 100 connected to the national apparatus 100. [

The network management unit 220 analyzes the optical line status information received from the optical line monitoring unit 230 and analyzes the optical line status information. When there is a failure in the optical line or a change in the status, the terminal 220 (not shown) To inform the network status.

The optical line monitoring unit 230 analyzes the optical line terminal diagnostic information and the subscriber unit diagnostic information about the optical module of the domestic apparatus 100 and the subscriber unit 700 from the optical path switching apparatus 100 to analyze the loss, Loss change occurrence, loss occurrence occurrence, failure occurrence occurrence, and failure occurrence occurrence period information to the network management unit 220. The optical line monitoring unit 230 of the network management system 200 may calculate the optical line loss in the optical line monitoring unit 130 of the national apparatus 100. However, Can be calculated.

The control unit 240 controls the communication unit 210, the network management unit 220, and the optical line monitoring unit 230.

A method of monitoring the state of an optical line in a passive optical network including the above-described optical line condition monitoring apparatus will be described with reference to FIGS. 6 to 9. FIG.

6 is a flowchart of a method of monitoring the state of an optical line according to an embodiment of the present invention.

6, the optical network unit 120 of the national server 100 first determines whether the power of the subscriber unit 700 is on or off (S100). The optical network unit 720 of the subscriber unit 700 sends an OAM message indicating that power is turned off to the optical fiber network 100 when the power supply is turned on and off, The subscriber unit 720 can determine whether the subscriber unit 700 is powered on or off based on the OAM message.

If it is determined in step S100 that the subscriber unit 700 is in the off state as a result of the determination of the subscriber unit 700, the optical line monitoring unit 130 checks the current state of the subscriber unit 700 The post-light-line condition monitoring is terminated (S101).

However, if it is determined in step S100 that the power supply state of the subscriber unit 700 is on, the optical network unit 120 receives the power information of the domestic device 100 and the subscriber unit 700 from the optical module 110 do. Examples of received power information will be described first with reference to FIGS. 7 to 9. FIG.

FIG. 7 is an exemplary view of information for monitoring the state of an optical line according to the first embodiment of the present invention, and FIG. 8 is a view for explaining the state of the optical line according to the second embodiment of the present invention, Fig. And FIG. 9 is an exemplary view illustrating information that is received for monitoring the state of the optical line according to the third embodiment of the present invention.

7, the optical module 110 receives the reception power information of the national apparatus 100 and the transmission power information of the subscriber unit 700 (S200, S201). 8, the optical module 110 receives the transmission power information of the national apparatus 100 and the reception power information of the subscriber unit 700 (S300 and S301).

9, the optical module 110 receives the transmission power information and the reception power information of the internal apparatus 100, and the transmission power information and the reception power information of the subscriber unit 700 (S400, S401 ). The steps S200 and S201, S300 and S301, and S400 and S401 may be performed in order. And what information is to be received can be selected at the time of designing the system, and therefore, the description is not limited to any one method.

7 to 9, the optical line monitoring unit 130 monitors the optical network unit 120 in step S200 and step S201, step S300 and step S301, step S400 and step S401, (S102) whether the state of the national apparatus 100 and the subscriber apparatus 700 is in a normal state or not, based on the power information of the national server apparatus 100 and the subscriber apparatus 700 received by the local apparatus 100 and the subscriber apparatus 700, respectively.

If a fault occurs in the national office apparatus 100 and the subscriber apparatus 700 itself, the optical line monitoring unit 130 checks the current state of the national apparatus 100 and the subscriber apparatus 700. Then, the current status is analyzed and reported to the network management system 200, and then the optical line status monitoring is terminated (S101).

However, when it is determined that the failure has not occurred in the national office apparatus 100 or the subscriber apparatus 700 itself, the optical line monitoring unit 130 monitors the power information of the national server apparatus 100 received from the optical network unit 120, The optical path loss between the national apparatus 100 and the subscriber apparatus 700 is calculated based on the power information of the apparatus 700 (S103).

The optical path loss between the national office apparatus 100 and the subscriber apparatus 700 can be calculated using Equation 1 below. The subscriber unit 700 when using Equation (1) becomes an ONU, and the received power information is the reception power information of the subscriber unit 700 as shown in FIG.

Figure pat00001

Wherein L OLT - and ONU is lost as a beam between the ONU affairs device 100 and network terminal 700 in units of dB value, P OLT _ TX is a transmission power value for the National History device 100 in dBm, P And ONU_RX denotes the reception power value of the ONU which is the subscriber unit 700 in dBm unit.

The optical path loss between the national office apparatus 100 and the subscriber apparatus 700 may be calculated using the following equation (2). The subscriber device 700 when using Equation (2) becomes ONT, and the received power information is the received power information of the subscriber device 700. [

Figure pat00002

Wherein L OLT - ONT is the loss value to the beam between the affairs device 100 and the network terminal (700) in dB ONT, P OLT _ TX is a transmission power value for the National History device 100 in dBm, P ONT_RX denotes a reception power value of the ONT which is the subscriber unit 700 in dBm unit.

In step S103, the optical line units 120 and 720 and the optical line monitoring unit 130 calculate the optical path loss value between the optical line monitoring unit 130 and the subscriber unit 700 And periodically collects the power information of the national apparatus 100 and the power information of the subscriber unit 700 in a polling manner. The transmission power information of the national apparatus 100 and the reception power information of the subscriber unit 700 can be collected in an interruption manner when a specific event such as a change in the light path loss or a failure occurs.

If the power information of the national server 100 received from the optical network unit 120 by the optical line monitoring unit 130 is the received power information as shown in FIG. 8 and the power information of the subscriber unit 700 is the transmitted power information , The optical path loss value is calculated based on the following equations (3) and (4).

The subscriber device 700 when using Equation (3) becomes the ONU, and the power information becomes the transmission power information of the subscriber device 700. [

Figure pat00003

Wherein L OLT - ONU is the loss value to the beam between the ONU affairs device 100 and network terminal 700, in dB, P ONU _ TX is a transmission power value of the ONU network terminal 700 in dBm , P _ RX OLT refers to a reception power value of affairs device 100 in dBm.

The optical path loss between the national office apparatus 100 and the subscriber apparatus 700 may be calculated using the following equation (4). The subscriber device 700 when using Equation (4) becomes ONT.

Figure pat00004

Wherein L OLT - ONT is the loss value to the beam between the affairs device 100 and the network terminal (700) in dB ONT, P ONT _ TX is a transmission power value of the network unit 700 in dBm ONT , P _ RX OLT refers to a reception power value of affairs device 100 in dBm.

When the power line monitoring unit 130 receives the power information of the national server 100 and the power information of the subscriber unit 700 received from the optical network unit 120 as both the transmission power information and the reception power information In the case of reception, the optical path loss in the downward direction is calculated through Equations (1) and (2), and the optical path loss in the upward direction is calculated through Equations (3) and (4). If there is a difference in the calculated light beam loss, it is determined that a failure has occurred in the national apparatus 100 and the subscriber apparatus 700. [

After calculating the light ray loss value as described above, the light ray path monitoring unit 130 compares the light ray loss value calculated in step S103 with the previously calculated light ray loss value (S104). That is, it is checked whether the change of the current light ray loss is out of the preset reference value (S105). If the current light ray loss is not more than the reference value, it is determined that there is no abnormality in the light ray. .

However, when the reference value is out of comparison with the previous light ray loss, the light ray path monitoring unit 130 judges that the light ray path is abnormal. Then, the optical line monitoring unit 130 confirms a change in the optical path loss between the other national apparatus and the subscriber apparatus connected to the optical network unit 120 (S106).

In the case of confirming the change in the light beam loss between the other national apparatus and the subscriber apparatus, the previously calculated value can be used as it is. However, in order to accurately analyze the loss interval and the failure interval, after detecting the change in the loss of the subscriber station device, the optical module diagnostic information is requested to all the other subscriber devices and then the information is collected and newly calculated As an example.

If the optical module diagnostic information newly requested to the subscriber unit can not be received within a predetermined time, the optical line monitoring unit 130 judges that the loss change in the optical line is very large. Accordingly, it can be judged that a failure such as a break in the corresponding optical line has occurred.

That is, it is checked whether the change of the light-ray loss is out of the reference value in all the national-service device-subscriber device sections (S107), and if the reference value is deviated from the all intervals, the light- (S108). Causes of increased optical path loss can be caused by tightening or bending of the optical line, or poor optical connector connection. In addition, when the optical line is disconnected, it is impossible to receive the received power information from the subscriber unit 700, so that it is possible to distinguish the optical line loss increase from the optical line disconnection.

However, if it is determined in step S107 that there is no loss change on the optical line for all the subscriber devices, it is checked whether the loss change is out of the reference value only in the optical line of all the subscriber devices connected to the specific second area node (S109).

If it is determined that the loss change is out of the reference value only in the optical line of all the subscriber units connected to the specific second area node, the optical line monitoring unit 130 determines that an error has occurred in the distribution line (S110). The loss of the power line may be caused by the optical line being tightened or bent, the optical connector connection failure, etc. In the case where the optical line is disconnected, the received power information can not be received from the subscriber terminals. It is possible to judge the disconnection separately.

However, as a result of checking in the step S109, if the loss change is out of the reference value only in the optical line of the specific DSLR and the subscriber unit, instead of the loss change in the optical line for all the subscriber units connected to the specific second area node, The controller 130 determines that an anomaly occurs in the lead line (S111). The reason for the change of the loss of the lead line is that the optical line may be tightened or bent, or the optical connector may be disconnected. In the case where the optical line is disconnected, the received power information can not be received from the subscriber terminals. It is possible to judge the disconnection separately.

According to the above-described procedure, when the optical line monitoring unit 130 analyzes the optical path loss between the national apparatus 100 and the subscriber apparatus 700, the analysis result is reported to the network management system 200 (S112 ).

When the state of the optical line is analyzed by such a method, since loss information is provided when the loss change is large by monitoring the loss change, the cause of the loss change is quickly detected before the service failure occurs, can do. In addition, in the case where a failure occurs in which the optical line is disconnected, it is possible to quickly recover from the failure by providing information on the occurrence of the failure and information on the failure occurrence region in real time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (13)

A method of monitoring an optical line condition monitoring apparatus interworking with a subscriber unit and a network management system,
Collecting diagnostic information of the subscriber unit from the subscriber unit and diagnostic information of the national apparatus for the optical line status monitoring apparatus itself;
Determining whether any one of the subscriber unit or the optical line condition monitoring apparatus has failed and calculating the optical line loss between the subscriber unit and the optical line condition monitoring apparatus if the failure has not occurred;
Comparing the calculated light ray loss value with the light ray loss value calculated at the previous time point to confirm whether the light ray loss change is out of a preset reference value; And
When the loss value of the optical path deviates from a preset reference value, the loss of the optical path loss is checked in which section between the subscriber unit adjacent to the subscriber unit and the optical path condition monitoring apparatus, and the change of the optical path condition is analyzed step
Wherein the optical path condition monitoring method comprises: The method according to claim 1,
The step of analyzing the optical path state change may include:
Requesting and receiving subscriber unit diagnostic information from all adjacent subscriber units, and determining whether there is a loss change in the optical line for all the adjacent subscriber units based on the received subscriber unit diagnostic information;
If there is no loss change on the optical line for all subscriber devices, checking if there is a loss change on the optical line for all subscriber devices connected to any local node; And
If there is no loss change in the optical line for all subscriber units connected to an arbitrary local node, judging that a change in the optical line state has occurred in the lead line
Wherein the optical path condition monitoring method comprises: 3. The method of claim 2,
If there is a loss change in the optical line for all the adjacent subscriber units, determining that a change in the optical line state occurs in the sub-line; And
If there is a loss change in the optical line for all the subscriber units connected to the arbitrary local node, judging that the optical line state change has occurred in the distribution line
Wherein the optical path condition monitoring method comprises: The method according to claim 1,
Prior to the step of collecting the national station apparatus diagnostic information,
Determining whether the power state of the subscriber unit is off; And
Stopping the optical line status monitoring if the power state of the subscriber unit is off,
Wherein the optical path condition monitoring method comprises: The method according to claim 1,
The step of collecting the national apparatus diagnosis information includes:
Receiving the reception power information of the subscriber unit and the transmission power information of the optical line condition monitoring apparatus
Wherein the optical path condition monitoring method comprises: The method according to claim 1,
The step of collecting the national apparatus diagnosis information includes:
Receiving the transmission power information of the subscriber unit and the reception power information of the optical line condition monitoring apparatus
Wherein the optical path condition monitoring method comprises: The method according to claim 1,
The step of collecting the national apparatus diagnosis information includes:
Receiving the reception power information and the transmission power information of the subscriber unit and the optical line condition monitoring apparatus, respectively
Wherein the optical path condition monitoring method comprises: An apparatus for monitoring a state of a light path in cooperation with a network management system and a subscriber apparatus,
And transmits and receives a message to and from the subscriber unit to receive the power status information and the subscriber unit diagnosis information of the subscriber unit, converts the electric signal into an optical signal and transmits the signal to the outside, An optical module for converting the signal into a signal and obtaining diagnosis information of the national apparatus;
An optical network unit for extracting diagnostic information including the power status information, the subscriber unit diagnostic information, and the national apparatus diagnostic information from the message received by the optical module; And
A loss value for the optical line is calculated on the basis of the diagnostic information extracted by the optical network unit, and the monitoring information is generated in which section of the section where the optical line is connected and the generated monitoring information is transmitted to the network management system The monitoring section
The optical path status monitoring apparatus comprising: 9. The method of claim 8,
A control unit for controlling the optical module, the optical network unit,
The optical path status monitoring apparatus comprising: 9. The method of claim 8,
The optical module includes:
A transmitter for receiving an electrical signal from the optical network unit and converting the electrical signal into an optical signal;
A receiver for converting an optical signal input from the outside into an electric signal and providing the converted electric signal to the optical network unit;
A multiplexer for transmitting the optical signal converted by the transmitter to the outside of the optical module and transmitting the optical signal received from outside the optical module to the receiver; And
A diagnosis unit for generating diagnosis information on the optical module based on the electric signal intensity and the optical signal transmission intensity from the transmitter and the receiver,
The optical path status monitoring apparatus comprising: 11. The method of claim 10,
Wherein the diagnostic apparatus information includes transmission power information of the transmitter and reception power information of the receiver. 9. The method of claim 8,
The subscriber device,
An optical module connected to the optical line condition monitoring device through a lead line and transmitting subscriber device diagnostic information to the optical line status monitoring device;
An optical network unit for generating power status information and transmitting the power status information to the optical line status monitoring apparatus through the optical module when the power status of the subscriber unit changes from an on state to an off state;
An interface unit for providing an interface for allowing a terminal to access a subscriber unit; And
A control unit for controlling the optical module, the optical network unit,
The optical path status monitoring apparatus comprising: 9. The method of claim 8,
The network management system comprising:
A communication unit connected to the optical line condition monitoring apparatus and receiving monitoring information from the optical line condition monitoring apparatus;
Upon receiving the optical line status monitoring apparatus and the optical line status information and the subscriber unit diagnostic information, the optical line status information including the loss and loss change of the optical line, the loss occurrence period, the occurrence of the failure and the failure occurrence period information An optical line monitoring unit for providing information;
A network manager for receiving the optical line status information from the optical line monitoring unit and providing the optical line status information to the terminal of the network manager; And
A control unit for controlling the communication unit, the optical line monitoring unit, and the network management unit
The optical path status monitoring apparatus comprising:
KR20130076681A 2013-07-01 2013-07-01 Apparatus and method for optical cable status supervision KR20150003602A (en)

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