KR20090132730A - System and method for determining optical fiber failure section - Google Patents

Abstract

PURPOSE: A system and a method for judging a fault of an optical cable relay section are provided to determine the fault of the optical cable relay section on the basis of state change information of ONT(Optical Network Terminals) in FTTH(Fiber To The Home) OLT(Optical Line Termination) equipment. CONSTITUTION: A primary RN(Remote Node) interval fault judging unit(126) receives an abnormal state signal from a PON(Passive Optical Network) port. The primary RN interval fault judging unit judges a primary RN interval fault in an abnormal state when ONTs of the first predetermined reference number and more do not transmit response signals within the first predetermined time. A second RN interval fault judging unit(128) judges a second RN interval fault in the abnormal state when the ONTs of the second predetermined reference number and more do not transmit the response signals within the second predetermined time.

Description

Optical cable relay section failure determination device and method thereof {System and Method for Determining Optical Fiber Failure Section}

The present invention relates to an apparatus and method for determining an optical cable relay section failure, and in particular, in an optical communication equipment (Fiber To The Home, FTTH) optical line terminal (OLT) equipment. The present invention relates to an optical cable relay section failure determining apparatus and method for determining a failure of an optical cable relay section based on state change information of an optical subscriber terminal (hereinafter referred to as 'ONT').

Passive Optical Network (hereinafter referred to as 'PON') is a subscriber network structure that forms a distributed topology of tree structure as a passive distributor of several ONTs in one optical cable port of FTTH OLT equipment.

PON reduces the length of the entire optical path, builds a reliable and inexpensive access network using only passive optical components, and combines and multiplexes signals between multiple subscribers and delivers them to high-speed backbone networks.

The PON broadcasts the downlink transmission flow from the external network to the subscriber due to the tree-shaped physical connection to all ONTs in the PON port of the FTTH OLT in a point-to-multipoint manner.

1 is a diagram schematically illustrating a network configuration of a passive optical communication network.

The optical cable from one PON port 110 of the FTTH OLT equipment 100 in the telephone company is branched to 1: M in the primary passive optical splitter (Remote Node, hereinafter referred to as 'RN') 200 outside M It is divided into two optical cables and again branched 1: N in the secondary RN (300), each divided into N optical cables and enters the subscriber premises. That is, one optical cable from physical port # 1 (110) of the FTTH OLT device 100 is branched into up to (M * N) optical cables (32 at current technology level), so that up to (M * N) subscribers It is connected to the ONT (400) of the home.

The FTTH OLT equipment 100 can know the communication status with the ONT 400 up to the maximum (M * N) branched from each PON port 110, but the primary RN optical cable monitoring section 210 and the secondary RN optical cable monitoring The actual configuration environment of the optical cable relay section of the section 310 is not known.

The RN is a passive device for branching / matching fiber signals and cannot provide fiber status information at all. Therefore, the FTTH OLT equipment 100 may not know which section of the optical cable section has a failure, and if there is a problem on the secondary RN optical cable monitoring section 310 instead of the first RN optical cable monitoring section 210, the second secondary RN It is unknown whether a failure occurs in the optical cable monitoring section 310.

In order to solve such a problem, the present invention is to provide an optical cable relay section failure determination apparatus and method for determining the failure of the optical cable relay section based on the state change information of the ONT in the FTTH OLT equipment.

According to an aspect of the present invention, there is provided a method for determining an obstacle of an optical cable relay section, the method comprising: collecting abnormal state information of individual optical subscriber connection devices from an optical line terminal device; And (b) using the collected abnormal state information to determine whether an abnormal state occurs in the individual optical subscriber connection device having a predetermined reference number or more within a predetermined time period among a plurality of optical subscriber connection devices connected to the optical cable from the passive optical communication network port. And determining a failure of the first passive optical splitter optical cable monitoring section or the second passive optical splitter optical cable monitoring section.

An apparatus for determining an optical cable relay section failure in accordance with a feature of the present invention receives an abnormal state signal of a passive optical network port and a steady state signal of the passive optical network port from an optical line terminal device to determine state information of the passive optical network port. A passive optical network port state determination unit; When the abnormal state signal is received from the passive optical network port, the optical subscriber connection devices belonging to different secondary passive optical splitters connected to the primary passive optical splitter in the same passive optical network port are preset within a preset first time. A primary section failure determining unit determining that the first passive optical splitter section is in an abnormal state when the individual optical subscriber connection device having the first reference number or more does not transmit a response signal; And the individual optical subscriber connection device having a predetermined number of second reference values or more within a predetermined second time period among the optical subscriber connection devices belonging to the same second passive optical splitter when receiving the steady state signal from the passive optical communication network port. In the abnormal state in which the response signal does not transmit, the secondary section failure determination unit for determining the passive optical splitter section failure.

An apparatus for determining an optical cable relay section failure in accordance with a feature of the present invention receives an abnormal state signal of a passive optical network port and a steady state signal of the passive optical network port from an optical line terminal device to determine state information of the passive optical network port. A passive optical network port state determination unit; And when the abnormal state signal is received from the passive optical communication network port, individual optical subscribers having a predetermined first reference number or more within a predetermined first time period among the optical subscriber connection devices connected to the primary passive optical splitter at the same passive optical communication network port. And a primary section failure determining unit determining that the primary passive optical splitter section has a failure in an abnormal state in which the access device does not transmit a response signal.

According to the above-described configuration, the present invention is to determine the failure of the optical cable relay section without the establishment of a facility for monitoring the failure of a separate optical cable relay section in the absence of a method for recognizing the failure on the optical cable relay section outside the national office when accepting the FTTH subscriber You can expect the effect.

The present invention can be expected to effect in real time to monitor the failure occurs due to the optical cable disconnection or RN problem on the primary RN optical cable monitoring interval.

The present invention can be expected to effect in real time to monitor the failure occurs due to the optical cable disconnection or RN problem on the secondary RN optical cable monitoring interval.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “block”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

2 is a diagram schematically illustrating a network configuration of a passive optical communication network according to an embodiment of the present invention.

The FTTH OLT device 100 recognizes state change information of individual ONTs 400 by exchanging state change signals with respective ONTs 400.

The monitoring system 120 according to an embodiment of the present invention receives the state change information of the individual ONTs 400 from the FTTH OLT device 100 in a polling manner or an event when the FTTH OLT device 100 receives the state change information. May be received in a manner.

The monitoring system 120 has a maximum of (M * N) ONTs 400 from the OLT PON port 110 through the primary RN optical cable monitoring section 210 and the secondary RN optical cable monitoring section 310 of the optical cable relay section. The configuration information related to the primary RN optical cable monitoring section 210, the secondary RN optical cable monitoring section 310, and the ONTs 400 is stored.

The individual ONTs 400 may transmit a power off signal to the FTTH OLT device 100 when the power ON signal has a function of generating a power off signal indicating the power off.

The terms used in the embodiments of the present invention are defined as follows.

Individual ONT states include steady state signals, power off state signals, and abnormal state signals.

The steady state signal is a state in which the state change signal is normally exchanged with the ONT 400, and the power off state signal is a state in which no response signal is received after receiving a power off signal from the ONT 400, and is in an abnormal state. The signal is a state in which the ONT 400 does not transmit a power off signal and suddenly does not transmit a response signal.

OLT PON port status includes a PON port abnormal status signal and a PON port steady status signal.

The PON port abnormal state signal is a state in which there is no signal at all from all ONTs 400 connected on the optical cable to the PON port 110 and includes an ONT 400 having no signal due to power off.

The PON port steady state signal refers to a state in which at least one ONT 400 is recognized as a normal state by receiving a state change signal from at least one ONT 400.

Next, an apparatus for determining an optical cable relay section failure will be described in detail with reference to FIG. 3. The apparatus for determining an optical cable relay section failure according to an embodiment of the present invention refers to the monitoring system 120. However, in another embodiment of the present invention, the optical cable relay section failure determining device may be configured in the FTTH OLT equipment 100.

3 is a block diagram schematically showing the internal configuration of the optical cable relay section failure determination apparatus 120 according to an embodiment of the present invention.

Optical cable relay section failure determination apparatus 120 according to an embodiment of the present invention is a state information receiver 122, OLT PON port state determination unit 124, primary RN section failure determination unit 126 and secondary RN section failure The determination unit 128 is included.

The state information receiving unit 122 receives the steady state signal, the power off state signal, and the abnormal state signal of the individual ONT 400 from the FTTH OLT equipment to collect state information for each ONT 400.

The OLT PON port state determination unit 124 receives the PON port abnormal state signal and the PON port normal state signal from the FTTH OLT device 100 to determine OLT PON port state information.

When the OLT PON port state information is a PON port abnormal state signal, the primary RN section failure determining unit 126 may use the abnormal RN signal of the individual ONTs 400 to belong to the same OLT PON port 110. Among the ONTs 400 belonging to different secondary RNs 300 connected to the 200, when the individual ONTs 400 of the first reference number or more preset within a predetermined first time are abnormal, the primary RN section failure occurs. To judge.

In addition, when the first RN section failure determination unit 126 receives a steady state signal from any one of up to 32 ONT 400 on the OLT PON port 110, the primary RN section failure determination unit 126 To judge.

When the OLT PON port state information is a PON port steady state signal, the secondary RN section failure determination unit 128 uses ONTs belonging to the same secondary RN 300 by using an abnormal state signal of the individual ONTs 400. In the case where the individual ONT 400 or more of the preset second reference number is abnormal within the preset second time, it is determined that the second RN section is a failure.

In addition, when the second RN section failure determination unit 128 receives a steady state signal even if one ONT 400 of the ONTs 400 accommodated in the secondary RN 300 that is determined to be a failure, the secondary RN section It is judged that the obstacle is released.

When the optical cable failure of the primary RN optical cable monitoring section 210 and the secondary RN optical cable monitoring section 310 occurs at the same time, the abnormal state of the corresponding subscriber ONT 400 occurs, while the second RN end (subscriber optical cable section and ONT) The occurrence of failure of the terminal 400 is an independent event between subscribers, and the probability of occurrence of abnormalities in several ONT 400 at the same time is practically low.

Therefore, in the optical cable section failure determination method according to an embodiment of the present invention, by determining the concurrency of the state abnormal events of the N ONT (400) by judging it as a state change by the same event probablely determines the section failure. .

Here, the meaning of the concurrency judgment means that the causes of the state abnormality events of the N ONTs 400 are not independent of each other but are caused by the same cause (the corresponding optical cable failure).

The time difference or monitoring system 120 from the first ONT 400 to the N until the FTTH OLT device 100 recognizes all abnormalities from the first ONT 400 to the Nth ONT 400 in the case of an actual optical cable failure. Time difference until all of the abnormal state information is received until the first ONT (400) may occur.

Therefore, the monitoring system 120 determines that all of the abnormal state information of the N ONTs 400 has been delivered within an appropriate time for the determination of concurrency, and thus, the abnormal state is caused by the same relay optical fiber failure.

As the number of the first reference number and the second reference number, which are the number of the above-mentioned ONT 400, increases, the probability of incorrectly determining a failure of the individual ONTs 400 is proportionally lowered.

When the individual ONT 400 does not have a function of generating a power-off state signal among the ONT functions, a failure determination error may be reduced by increasing the number of the ONT 400 in an abnormal state to determine concurrency.

The monitoring system 120 determines both an abnormal state when an individual ONT generates a power off state signal and an abnormal state of both individual power off states and an abnormal state when the power on state signal fails to generate a power off state signal. Done.

The monitoring system 120 may receive the steady state signal, the power off signal, and the abnormal state signal of the individual ONT 400 from the FTTH OLT device 100, and filter the power off signal from the FTTH OLT device 100 to separate the individual signals. Only the steady state signal and the abnormal state signal of the ONT 400 may be received.

The primary RN section failure determination unit 126 according to the second embodiment of the present invention may be configured to connect only to the individual ONT 400 by configuring only the primary RN 200 without the secondary RN 300.

In this case, when the primary RN section failure determination unit 126 receives an abnormal state signal from the OLT PON port 110, among the ONTs 400 connected to the primary RN 200 at the same OLT PON port 110. If an abnormal state in which the individual ONT 400 or more than the predetermined first reference number does not transmit the response signal within the preset first time is determined as the first passive optical splitter section failure.

Referring to Figure 4 will be described in detail the optical cable relay section failure determination method.

4 is a view for explaining a failure determination method of the optical cable relay section according to an embodiment of the present invention.

The state information receiver 122 collects abnormal state information of the individual ONTs 400 from the FTTH OLT device 100 and determines whether the corresponding ONT 400 is in a power off state (S100 and S102).

The passive optical communication network port state determination unit determines whether the OLT PON port 110 is in an abnormal state when the corresponding ONT 400 is not powered off (S104).

When the OLT PON port 110 is in an abnormal state, the primary RN section failure determination unit 126 uses the abnormal state information of the individual ONTs 400 collected to belong to the primary RN belonging to the same OLT PON port 110. From among ONTs 400 belonging to different secondary RNs 300 connected to 200, it is determined whether an abnormal state occurs in an individual ONT 400 that is greater than or equal to a first predetermined reference number M within a preset first time. (S106).

Subsequently, the primary RN section failure determination unit 126 is abnormal in an individual ONT 400 having a predetermined first reference number or more within a predetermined first time period among the ONTs 400 belonging to different secondary RNs 300. Is generated, it is determined that the failure of the primary RN optical cable monitoring section 210 (S108).

For example, among the ONTs 400 belonging to different secondary RNs 300 connected to the same primary RN 200, three (preset reference times) of three individual ONTs (within a preset time) within 3 seconds. If an abnormal state occurs in 400, it is determined that the failure of the primary RN optical cable monitoring section 210.

When the OLT PON port 110 is not in an abnormal state, the secondary RN section failure determination unit 128 uses ONTs belonging to the same secondary RN 300 by using abnormal state information of individual ONTs 400 collected. If an abnormal state occurs in the individual ONT 400 or more within a preset second time period within the preset second time, it is determined as a failure of the secondary RN optical cable monitoring section 310 (S110, S112).

The embodiments of the present invention described above are not implemented only by the apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention, a recording medium on which the program is recorded, and the like. Such implementations may be readily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram schematically illustrating a network configuration of a passive optical communication network.

2 is a diagram schematically illustrating a network configuration of a passive optical communication network according to an embodiment of the present invention.

3 is a block diagram schematically illustrating an internal configuration of an apparatus for determining a failure of an optical cable relay section according to an exemplary embodiment of the present invention.

4 is a view for explaining a failure determination method of the optical cable relay section according to an embodiment of the present invention.

Claims (9)

(a) collecting abnormal state information of individual optical subscriber connection devices from the optical line terminal equipment; And (b) using the collected abnormal state information to determine whether an abnormal state has occurred in an individual optical subscriber connection device having a predetermined reference number or more within a preset time period among a plurality of optical subscriber connection devices connected to the optical cable from the passive optical communication network port; Determining the failure of the primary passive optical splitter optical cable monitoring section or the secondary passive optical splitter optical cable monitoring section Optical cable relay section failure determination method comprising a. According to claim 1, Between step (a) and step (b), (a-1) determining whether an abnormal state signal of the passive optical network port indicating the absence of any signal is received from all the optical subscriber connection devices connected on the optical cable from the optical line terminal equipment; Optical cable relay section failure determination method further comprising. The method of claim 2, In step (b), When an abnormal state signal of the passive optical network port is received, light belonging to different secondary passive optical splitters connected to the primary passive optical splitter in the same passive optical network port using abnormal state information of the individual optical subscriber connection devices. Determining the failure of the first passive optical splitter optical cable monitoring interval when an abnormal state occurs in the individual optical subscriber connection device of the first access number or more than the first reference number within a predetermined first time of the subscriber access devices; Optical cable relay section failure determination method comprising a. The method of claim 2, In step (b), When the abnormal state signal of the passive optical network port is not received, within the second predetermined time period among the optical subscriber connection devices belonging to the same second passive optical splitter using the abnormal state information of the individual optical subscriber connection devices. Determining an abnormality in the second passive optical splitter optical cable monitoring section when an abnormal state occurs in the individual optical subscriber connection device having a preset second reference number or more; Optical cable relay section failure determination method comprising a. A passive optical network port state determination unit for receiving an abnormal state signal of the passive optical network port and a steady state signal of the passive optical network port from the optical line terminal equipment to determine state information of the passive optical network port; When the abnormal state signal is received from the passive optical network port, the optical subscriber connection devices belonging to different secondary passive optical splitters connected to the primary passive optical splitter in the same passive optical network port are preset within a preset first time. A first section failure determining unit determining that the first passive optical splitter section is in an abnormal state when the individual optical subscriber connection device having the first reference number or more does not transmit a response signal; And The individual optical subscriber connection device having a predetermined second reference number or more within a predetermined second time period among the optical subscriber connection devices belonging to the same secondary passive optical splitter when the abnormal state signal is not received from the passive optical network port; In the abnormal state that does not transmit the response signal, the secondary section failure determination unit for determining the secondary passive optical splitter section failure Optical cable relay section failure determination device comprising a. The method of claim 5, A normal state signal, a power off state signal, and an abnormal state signal of the individual optical subscriber connection device are received from the optical line terminal equipment, wherein the abnormal state signal is a state in which there is no response signal without transmitting the power off state signal. Status information receiver to collect status information for each optical subscriber connection device Optical cable relay section failure determination device further comprising. The method of claim 6, When the individual optical subscriber connection device does not have a function of generating the power off state signal, the first optical device failure determining unit and the second optical device failure determining unit are both powered off and abnormal. Device for determining the optical cable relay section failure, characterized in that determined by the abnormal state signal of the individual optical subscriber connection device. The method of claim 6, The first section failure determining unit and the second section failure determining unit have the function of generating the power-off state signal when the individual optical subscriber connection device does not have a function to generate the predetermined first reference number and the predetermined second reference number. Device for determining an optical cable relay section failure by reducing the error determination error by increasing the. A passive optical network port state determination unit for receiving an abnormal state signal of the passive optical network port and a steady state signal of the passive optical network port from the optical line terminal equipment to determine state information of the passive optical network port; And When receiving the abnormal state signal from the passive optical network port, the individual optical subscriber connection more than a predetermined first reference number within a predetermined first time period among the optical subscriber connection devices connected to the primary passive optical splitter in the same passive optical network port. Primary section failure determination unit that determines that the first passive optical splitter section failure when the device does not transmit a response signal Optical cable relay section failure determination device comprising a.

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