KR20050028460A - Optical line terminal in passive optical network and method for managing a fault - Google Patents

Abstract

An OLT(Optical Line Terminal) in a PON(Passive Optical Network) and a failure management method are provided to prevent an excessive traffic increase toward a network management system managing plural PONs as an OLT transmits fault contents over an appointed class to the network management system. An OLT(102) consists of a message receiving part(200), a message classification part(210), and a message management part(220). The OLT(102) is connected with an ONU(Optical Network Unit)(106) and a network management system(110). The message receiving part(200) receives fault messages from the ONU(106). The message classification part(210) classifies the received fault messages according to fault classes. The message management part(220) transmits the contents of a fault message to the network management system(110) in case that the fault class of the fault message is over an appointed class.

Description

Optical line terminal in passive optical network and method for managing a fault}

The present invention relates to an optical line terminal (OLT) and a failure management method of a passive optical network (PON), and more particularly, a mother device connected to a network management system for managing one or more passive optical networks. And a failure management method for managing a failure of an optical network unit (ONU) in a mother station device.

1 is a view showing an embodiment of a passive optical network having a conventional network management system.

Referring to FIG. 1, a passive optical network is a splitter for connecting one mother station device 102, which is a network side device, a plurality of local station devices 106, which are subscriber side devices, and a mother station device 102, and a plurality of local station devices 106. (Splitter) 104.

The splitter 104 distributes an optical signal between the mother station device 102 and the local station device 106, and uses time division multiplexing (TDM) and wavelength division multiplexing (WDM) for the transmission of the optical signal. Multiplexing methods such as Multiplexing and Supply Chain Management (SCM) are used.

The mother station 102 is connected to the broadcast service node, the video service node on demand and the Internet service node by STM-1 line. In addition, the mother station device 102 is connected to the network management system 110 for managing one or more passive optical networks. The network management system 110 investigates and manages the failure and performance of the mother station apparatus 102 and the local station 106 of the passive optical network, and provides the administrator with related information of the mother station 102 and the local station 106. Do this.

The own station apparatus 106 is connected to the mother station apparatus 102 in a tree structure, and the number of station apparatuses 106 connected to one mother station apparatus 102 is determined according to the branching ratio of the splitter 104. The local station 106 is connected to the subscriber station 130 through a VDSL modem or 10 / 100M Ethernet interface.

The conventional network management system 110 centrally manages a plurality of mother station devices 102. In addition, the network management system 110 directly manages the state of the plurality of local station devices 106 connected to each mother station device 102 through the mother station device 102. Therefore, a large amount of management data for network management generates a large amount of traffic in the network connected to the network management system 110 and increases the traffic burden of the network.

In addition, when the latest user network interface technologies such as Gigabit Ethernet and CATV are applied to the passive optical network, the necessity of managing the operation of the local device becomes higher and more management data is required. The increase puts a burden on the efficient management of the own home appliances.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a mother station apparatus and a failure management method for reducing the failure management burden of a manager system of a passive optical network and efficiently managing a failure of a local station.

Another technical problem to be solved by the present invention is to reduce the burden of burden management of a manager system of a passive optical network and to read a computer program for executing a fault management method for efficiently managing a fault of a local apparatus. To provide a recording medium.

One embodiment of a mother station apparatus in a passive optical network according to the present invention for achieving the above technical problem, the fault content of the hardware or software of the own station apparatus using a predetermined protocol from the optical network unit Message receiving unit for receiving a failure message comprising a; A message classification unit classifying the received failure message based on a predetermined failure level; And a message management unit outputting the failure message to a network management system managing one or more passive optical networks if the failure level of the classified failure messages is equal to or greater than a predetermined level.

In order to achieve the above technical problem, an embodiment of a failure management method according to the present invention includes: (a) setting a predetermined failure level; (b) receiving a failure message from the optical network unit, the failure message including the failure of the hardware or software of the local device; (c) classifying the fault message based on the fault level; And (d) outputting the failure message to a network management system managing one or more passive optical networks if the failure level of the classified failure message is equal to or greater than a predetermined failure level.

According to the present invention, the mother station apparatus prevents excessive traffic increase to the network management system managing one or more passive optical networks by transmitting the fault content of a certain level or more to the network management system.

Hereinafter, with reference to the accompanying drawings will be described in detail a mother station apparatus and a failure management method of a passive optical network according to the present invention.

2 is a block diagram showing an embodiment of a mother line apparatus (Optical Line Terminal) according to the present invention.

Referring to FIG. 2, the mother station apparatus 102 according to the present invention includes a message receiver 200, a message classifier 210, and a message manager 220. The message manager 220 includes a message generator 230 and a message transmitter 240. In addition, the mother station device 102 is connected to the optical network unit 106 and the network management system 110.

The network management system 110 is a system for managing one or more passive optical networks. The network management system 110 receives and analyzes a failure message from the passive optical network and outputs it to an administrator to maintain and manage the passive optical network.

An Optical Network Unit (ONU) 106 is a device located at the end of a network that multiplexes a plurality of user traffics. Therefore, in the event of a system abnormality of the own station 106, an accurate report on it should be reported to the administrator promptly, and according to the present invention, it is possible to monitor the fault state of the system so that the own station always operates in a normal state. Disability management measures are needed.

The message receiving unit 200 receives a failure message from the local station 106. When the local station 106 detects a failure of the local station itself, the local station 106 transmits the failure details to the message receiving unit 200 in the form of an IPC message.

The failure message includes a transmission / reception failure or a switching failure due to a hardware or software error occurring in the local station 106. The local station 106 may generate and operate a process for detecting a failure of its own, and the process may detect an interrupt by detecting an interrupt caused by a failure of the local device.

The message classifier 210 classifies the received fault message based on the fault level. The fault level is classified according to the severity of the fault and is arbitrarily set according to the operation management criteria of the system. The failure level may be set by being received from the network management system 110 or directly inputted from the mother station apparatus 102.

For example, the fault monitoring unit of the local station 106 may have a PON link failure, a software failure, a user link failure, a bandwidth violation to transmit more traffic than the bandwidth set for the user network interface, and an instantaneous L2 at the time of data transmission in the PON interval. Detect non-critical link failures and non-critical computation failures of ONU management software. The message classification unit 210 classifies the PON link failure and the software failure among the above-described failures into one level, and classifies the user link failure into two grades and the remaining three grades. Then, the message management unit 220 transmits only the first and second level failure messages to the network management system (110).

Specifically, the criterion for dividing the disability level is whether the communication service provided to the user is possible or not. When the 1st and 2nd class failure occurs, the communication service between OLT-ONU is impossible, and the 3rd level means that the service is possible, but if this situation lasts for a certain time, it is an alarm that may affect the system later.

In the E-PON network manager system, if a failure such as PON link failure, ONU software failure or user link failure occurs, the operator can be reported to the operator promptly so that the operator can cope with it, and the status information between the network manager system and the actual system matches Should However, because the level 3 failure is not a serious impact on system operation or service provision, rather than reflecting the status to the network manager system in real time, the status of the link between ONU or OLT-ONU to be specifically monitored by the operator is not. An efficient way to manage this is to set it up to report only when you want to know more about it. Therefore, the E-PON network manager system can set the fault reporting level by ONU to the fault management agent of the home country device to receive the fault message for the 3rd level fault only when necessary.

The message manager 220 transmits the contents of the failure message to the network management system 110 when the failure level of the failure message is determined by the message classification unit 210 to be above a certain level. The message manager 220 includes a message generator 230 and a message transmitter 240.

The message generator 230 generates a simple network management protocol (SNMP) message based on the failure message when the failure level of the failure message is determined by the message classification unit 210 to be above a certain level. The message generating unit 230 may generate a message suitable for the protocol if a protocol previously agreed to transmit and receive the message between the mother station apparatus 102 and the network management system exists. Network Management Protocol (SNMP) is a protocol for monitoring network management and network devices and their operation. A detailed description of the network management protocol can be found in the IETF (www.ietf.org).

The message transmitter 240 transmits the generated network management protocol message to the network management system 110. As a result, the network management system 110 may reduce the increase of excessive traffic to the network management system 110 by receiving only a fault message of a certain level or higher.

3 is a block diagram showing another embodiment of a mother country apparatus according to the present invention.

Referring to FIG. 3, the mother station apparatus 102 includes a message receiver 300, a message classifier 310, a message processor 320, a message generator 330, and a message transmitter 340. 102 is connected to the failure detection unit of the network management system 110 and the local station 106.

The message receiving unit 300, the message classifying unit 310, the message generating unit 330, and the message transmitting unit 340 are the message receiving unit 200, the message classifying unit 210, and the message generating unit (described with reference to FIG. 2). 230 and the message transmission unit 240 and its function and configuration are the same, so a detailed description thereof will be omitted.

The failure detection unit of the local station 106 detects a failure occurring in the local station 106, generates a detected failure information as an IPC message, and transmits the detected failure information to the mother station 102.

The message processing unit 320 is responsible for transmitting and receiving messages between the components in the mother station apparatus 012. That is, message transfer between the message receiver 300, the message classifier 310, the message generator 330, and the message transmitter 340 is performed by the message processor 320. For example, the message processor 320 transmits the message classified by the message classifier 310 to the message generator 330, and sends the message transmitted by the message generator 330 to the message transmission unit 340. ) To transmit to.

4 is a flowchart illustrating a flow of a problem management method in the mother station apparatus according to the present invention.

Referring to FIG. 4, the message manager 220 receives a failure level setting message from the network management system 110 (S400). After classifying the failure level based on the failure level setting message (S405), when receiving a failure message from the local station 106 (S410), the message classification unit 210 classifies the received failure message according to the set failure level. (S415).

If the failure level of the failure messages classified by the message classification unit 210 is more than a predetermined failure level (S420), the message generator 230 generates a network management protocol (SNMP) message for failure reporting (S425). ). The message transmitter 240 transmits the generated network management protocol message to the network management system 110 (S430). As a result, only a failure message of a certain failure level is transmitted to the network management system, thereby preventing excessive traffic increase to the network management system.

5 is a flowchart illustrating a flow of a failure grade setting process in a failure management method according to the present invention.

Referring to FIG. 5, the message manager 220 receives a failure level setting message from the network management system 110 (S500). The message classification unit 210 sets a failure level based on the received failure level setting message (S505).

If an error occurs in the failure level setting process by the message classification unit 210 (S510), the message manager 220 generates a failure level setting error message (S515), and if the failure level setting is normally completed (S510), the message The management unit 220 generates a failure level setting success message (S520). Then, the message transmitter 240 transmits a failure level setting error message or failure level setting success message to the network management system 110 (S525).

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The foregoing descriptions are merely illustrative of preferred embodiments, and the present invention is not limited to the above-described embodiments and can be variously changed within the scope of the appended claims. For example, the shape and structure of each component specifically shown in the embodiment of the present invention may be modified.

According to the present invention, the mother station apparatus prevents excessive traffic increase to the network management system managing one or more passive optical networks by transmitting the fault content of a certain level or more to the network management system. The network management system can efficiently identify and manage the status of the mother station and the local station of the passive optical network by selectively receiving the fault contents required by the mother station.

1 is a view showing an embodiment of a passive optical network having a conventional network management system,

2 is a block diagram showing an embodiment of a mother line apparatus (Optical Line Terminal) according to the present invention,

3 is a block diagram showing another embodiment of a mother country apparatus according to the present invention;

4 is a flowchart illustrating a flow of a failure management method according to the present invention;

5 is a flowchart illustrating a flow of a failure level setting method according to the present invention.

Claims (9)

A message receiving unit which receives a fault message including a fault of hardware or software of the own station apparatus using a predetermined protocol from an own network unit; A message classification unit for assigning a predetermined failure level to the received failure message according to the failure contents; And And a message management unit for outputting the failure message to a network management system managing one or more passive optical networks, if the failure level of the classified failure messages is equal to or greater than a predetermined level. The method of claim 1, The failure level includes a first level indicating a PON link failure and a software failure of a local station, a second level indicating a user link failure, and a third level indicating a bandwidth violation and instantaneous link failure of data transmission and reception. And the message manager outputs the failure message to the network management system if the failure message corresponds to the first and second grades. The method of claim 1, The message receiving unit is matched with a Passive Optical Network (Passive Optical Network), and the mother station apparatus characterized in that to receive the failure information of the local device in the form of an InterProcess Communication (IPC) message that can be recognized in the process (process). The method of claim 1, The message management unit, A message generator for generating a network management protocol message, which is a network management and monitoring protocol, based on the failure message; And And a message transmitter for transmitting the generated network management protocol message to a network management system managing one or more passive optical networks. (a) setting a predetermined level of failure; (b) receiving a failure message from the optical network unit, the failure message including the failure of the hardware or software of the local device; (c) assigning the fault message to the fault level according to the fault content; And (d) outputting the failure message to a network management system managing one or more passive optical networks, if the failure level of the classified failure message is equal to or greater than a predetermined failure level. The method of claim 5, The failure level includes a first level indicating a PON link failure and a software failure of a local station, a second level indicating a user link failure, and a third level indicating a bandwidth violation and instantaneous link failure of data transmission and reception. And the message management unit outputs the failure message to the network management system if the failure message corresponds to the first and second grades. The method of claim 5, The step (b) comprises the step of receiving the failure information of the local device in the form of IPC (InterProcess Communication) message that can be recognized in the process (process). The method of claim 5, In step (d), (d1) generating a simple network management protocol message, which is a network management and monitoring protocol, based on the failure message; (d2) transmitting the generated network management protocol message to a network management system managing one or more passive optical networks. (a) setting a predetermined level of failure; (b) receiving a failure message from the optical network unit, the failure message including a failure content of the hardware or software of the local device; (c) classifying the fault message based on a predetermined fault level; And (d) outputting the failure message to a network management system managing at least one passive optical network if the failure level of the classified failure message is equal to or greater than a predetermined failure level. A computer-readable recording medium that records a program to run on a computer.