KR100564747B1 - Optical Line Terminal for reconstructing a channel in passive optical network and method therefor - Google Patents

Abstract

A mother station apparatus and channel setting method for establishing a channel in a passive optical network are disclosed. The command receiving unit receives a channel setting command including an address of the ONU and an address of a port connected to the ONU from the outside. The frame generation unit generates a frame including the ONU and a port address in correspondence with a predetermined communication protocol set for communication with the ONU. The frame transmitter transmits the generated frame to the ONU using a communication protocol. The channel setting unit sets the communication channel with the ONU based on the ONU address and the port address. This eliminates the inconvenience that the operator must change the channel information of the ONU directly at the location where the ONU is installed, when the ONU connected to a specific port of the OLT is changed to another port in the OLT.

Description

Optical Line Terminal for reconstructing a channel in passive optical network and method therefor}

1 is a view showing an embodiment of a conventional Ethernet passive optical network,

FIG. 2A illustrates an example of changing a connection of a local station ONU connected to a specific port of a mother station apparatus OLT to another port in the mother station apparatus; FIG.

2B is a view showing another example of changing a connection of a local station connected to a specific port of a mother station to another port in the mother station;

3A illustrates an example of a passive optical network that performs a channel resetting function according to the present invention;

3B is a diagram illustrating a configuration of a mother station apparatus performing a channel reset function according to the present invention;

4 is a flowchart illustrating a flow of a channel reset method according to the present invention;

5A and 5B show the structure of a frame according to the present invention, and

6 is a diagram illustrating an example of channel information before and after channel reset according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical line terminal and an optical network unit of a passive optical network. More particularly, the present invention relates to a network between a mother station (OLT) and a local station (ONU). A method and apparatus for resetting a channel when reconfigured.

1 is a view showing the configuration of a conventional Ethernet passive optical network.

Referring to Fig. 1, a passive optical network is composed of a mother station apparatus (OLT) 102, a local station apparatus (ONU) 110 to 120, and splitters 104, 106 and 108. The master station 102 is connected to an audio / video network 130, an IP network 132, an ATM / Sonet network 134, a TDM / PSTN network 136, etc., and the local station 110-120 is one or more subscriber stations. It is connected to the device (150 to 164) to provide a service. The mother station 102 and the host devices 110-120 are multiplexed by the splitters 104, 106, 108 and are generally multiplexed at a ratio of 1:16 or 1:32. The mother station 102 includes a plurality of PON Cards, one PON Card includes a plurality of ports, and splitters 104, 106, and 108 are connected to each port.

In the conventional passive optical network, when a number of local devices connected to a specific port of a mother device is changed to another port in the mother device during network operation, the management channel established for the operation management of the mother devices is lost and the mother device is no longer used. Management and control of the own station is not possible.

Conventionally, if the existing management channel is lost during network operation, the operator goes to the remote site where the own station device is installed to set the management channel between the host station device and the own station device for management and control of the own station device. Change the information to new management channel information. However, if a large number of local devices are required to perform this series of operations in different locations at remote locations, significant economic cost loss occurs in terms of network operation management and maintenance.

The technical problem to be achieved by the present invention is that the operator does not directly change the channel information at the installation location of the own station apparatus when the local station apparatus ONU connected to a specific port of the master station apparatus OLT changes its connection to another port in the mother station apparatus. In addition, the present invention provides a mother station apparatus and a channel resetting method for resetting a channel of the own station apparatus in the mother station apparatus.

Another technical problem to be solved by the present invention is that the operator directly changes the channel information at the installation location of the own station device when the local station device ONU connected to a specific port of the own station device OLT changes its connection to another port in the own station device. Instead, the present invention provides a computer-readable recording medium having a program for executing a channel resetting method for resetting a channel of a local device in a mother station.

In order to achieve the above technical problem, an embodiment of a mother station apparatus in a passive optical network according to the present invention includes a command for receiving a channel setting command including an address of an ONU and an address of a port connected to the ONU from the outside. Receiving unit; A frame generation unit generating a frame including the addresses in response to a predetermined communication protocol set for communication with the ONU; A frame transmitter which transmits the generated frame to the ONU using the communication protocol; And a channel setting unit configured to set a communication channel with the ONU based on the address of the ONU and the address of the port.

According to an aspect of the present invention, there is provided a channel setting method comprising: (a) receiving a channel setting command including an address of an ONU and an address of a port connected to the ONU from the outside; (b) generating a frame comprising the addresses in correspondence with a predetermined communication protocol configured for communication with the ONU; (c) transmitting the generated frame to the ONU using the communication protocol; And (d) establishing a communication channel with the ONU based on the address of the ONU and the address of the port.

This eliminates the inconvenience that the operator must change the channel information of the ONU directly at the location where the ONU is installed, when the ONU connected to a specific port of the OLT is changed to another port in the OLT.

Hereinafter, a mother station apparatus (OLT) and a channel resetting method for performing a channel resetting function according to the present invention will be described in detail with reference to the accompanying drawings.

2A is a diagram illustrating an example of changing a connection of a local station ONU connected to a specific port of a mother station apparatus OLT to another port in the mother station apparatus.

Referring to FIG. 2A, the first local device (ONU) 220 is connected to the first port of the first PON card 204 through the first splitter 210. Transmission and reception of management information between the OLT 200 and the ONU 220 is performed by a User Datagram Protocol (UDP), and the management information is in the form of an IPC (Inter Process Communication) message.

IPC is a set of programming interfaces that allow programmers to create and manipulate individual programs that will run concurrently on one operating system, allowing one program to handle the needs of many users at the same time. In addition, since the needs of a single user can result in running multiple processes in the operating system, inter-process communication is required for these users, which the IPC interface enables.

For UDP communication, an IP address must be assigned to each device (ONU, OLT port, etc.) in advance. And, since these IP addresses are preferably not recognized by devices or users outside the passive optical network area, private IP addresses are generally used.

When the first slave device 220 connected to the first splitter 210 is moved to the second splitter 212, the IP addresses of the existing ONU and OLT ports cannot be used as they are. The first host device 220 transferred to the second splitter 212 has an IP address of 10.100.209.5 and is connected to the second port of the second PON card 206 having an IP address of 10.100.209.1.

FIG. 2B is a diagram illustrating another example of changing the connection of the local station ONU connected to a specific port of the mother station apparatus OLT to another port in the mother station apparatus.

FIG. 2B illustrates a case in which a splitter including a plurality of ONUs is changed to another port in the OLT without moving one ONU. Referring to FIG. 2B, the splitter connected to the first port of the first phone card 254 is changed to the first port of the second phone card 256.

2A and 2B, when the local station ONU is changed to another port in the mother station OLT, the transmitting / receiving IP address for communication between the ONU and the OLT should be changed. In this case, the operator can change the channel setting information including the IP address remotely by OLT in order to solve the inconvenience of having to change the IP address directly at the installation site of the ONU and the inefficiency of maintenance and management of the ONU. It is necessary.

3A illustrates an embodiment of a passive optical network that performs a channel reset function according to the present invention.

Referring to FIG. 3A, the passive optical network (EPON) is composed of a mother station unit (OLT) 302, a local station unit (ONU) 306, 308, 310) and a splitter 304, and each of the OLT 302 and the ONU 306, 308, 310 It includes a channel management unit. The OLT 302 is connected to an operator terminal device 312 configured separately from the passive optical network.

The operator terminal device 312 receives a command from the operator and transmits it to the channel manager 303 of the OLT. The input commands include the shutdown command and the channel setting command of ONU, and the input parameters are different according to each command.

For example, the parameters included in the shutdown command include ONU identification information and blocking information instructing to perform service interruption (shutdown setting) or service restart (shutdown shutdown) of the ONU. Parameters included in the channel setting command include ONU identification information, IP address of the new ONU for changing channel information, and IP address of the OLT.

In addition, several commands for channel management can be defined and used. The operator terminal device 312 receives a command from the operator through a command line interface (CLI).

The OLT channel manager 303 generates an Inter Process Communication (IPC) frame corresponding to the command received from the operator terminal device 312 and transmits it to the channel managers 307, 309 and 311 of the corresponding ONU by using UDP / IP communication. .

The channel managers 307, 309 and 311 of the ONU interpret the received frames to perform the commands requested by the frames and transmit the results to the channel manager 303 of the OLT.

The operator first inputs a shutdown command to the ONUs 306, 308 and 310 to reset the channel and then resets the channel with the ONUs 306, 308 and 310 by inputting a channel setting command. By resetting the channel and changing the physical connection of the ONUs 306, 308 and 310, the disadvantage of having to set channel information directly in the ONU 306, 308 and 310 after the conventional physical change is overcome.

3B is a block diagram showing the configuration of a mother station apparatus (OLT) that performs a channel reset function according to the present invention.

Referring to FIG. 3B, the OLT channel manager 303 of FIG. 3A includes a command receiver 350, a frame generator 352, a frame transmitter 354, and a channel setter 356.

The command receiving unit 350 receives a command from the operator terminal device 312. The command includes a shutdown command of ONU and a channel setting command of ONU. The ONU shutdown command is divided into a command for instructing service interruption of a specific ONU 306, 308, 310 and a command for instructing service restart of a specific ONU 306, 308, 310. The operator inputs a service interruption command through the operator terminal device 312 when it is necessary to interrupt the service of the ONU before resetting the channel of the ONU. In addition, after the operator establishes a communication channel with the ONU, the operator inputs a service resume command of the ONU through the operator terminal device 312.

The frame generator 352 generates an IPC frame corresponding to a command (shutdown command, channel setup command) received by the command receiver 350. In the case of a shutdown command, the frame includes identification information of the ONUs 306, 308, and 310 to be suspended or restarted. And the new IP address of the OLT 302. The frame generated by the frame generator will be described in detail with reference to FIGS. 5A and 5B.

The frame transmitter 354 transmits the generated frame to the corresponding ONUs 306, 308, and 310. Upon receiving the frame, the ONU interprets the frame to determine what type of command the frame contains. The ONU performs an operation according to the identified command and generates an execution result frame. The ONUs 306, 308 and 310 transmit the generated performance frames to the OLT 302. For example, in the case of a shutdown command requiring service interruption, the ONU channel management unit 307, 309, 311 shuts down the ONU, and in the case of a channel setting command, the ONU channel management unit 307, 309, 311 is in the case of a channel setting command. 302) Change the IP address information of the port.

The channel setting unit 356 sets the channel based on the IP address of the ONU and the IP address of the OLT included in the channel setting command when the command receiving unit receives the channel setting command from the operator terminal device. As a result, the channels of the OLT 302 and the ONUs 306, 308, 310 are reconfigured and can be transmitted and received on the channels after the physical reconnection of the ONUs.

The operator inputs a shutdown command requesting service interruption, a channel setup command, and a shutdown command requesting service restart in order to solve the inconvenience of having to set the ONU channel at the installation site of the ONU.

4 is a flowchart illustrating a flow of a channel setting method according to the present invention.

Referring to FIG. 4, the operator terminal device 312 transmits a shutdown command for requesting service termination of the ONU received from the operator to the OLT channel manager 303 (S400). The shutdown command may be for a particular subscriber port of the ONU or for all subscriber ports of the ONU. In the case of a specific subscriber port of the ONU, information on the specific subscriber port is input in the shutdown command. The OLT channel manager 303 generates an IPC frame corresponding to the shutdown command (S402), and transmits the generated IPC frame to the corresponding ONU channel managers 307, 309, and 311 (S404).

The ONU channel managers 307, 309 and 311 stop the service of the ONU according to the shutdown command included in the frame (S406). The ONU channel managers 307, 309, and 311 generate a response frame including a result of performing the shutdown command (S408). The response frame includes fields indicating a case where the execution result is normal and an error case. The ONU channel manager 307, 309, 311 transmits the generated response frame to the OLT channel manager 303 (S410).

Frame transmission and reception between the ONU channel managers 307, 309 and 311 and the OLT channel manager 303 is performed using User Datagram Protocol (UDP), and each port of the ONU and OLT is assigned an IP (Internet Protocol) address for UDP communication. .

The OLT channel manager 303 analyzes the response message received from the ONU channel managers 307, 309, and 311 to determine the processing result of the shutdown command in the ONU (S412). When the shutdown command is normally performed, the OLT channel manager 303 records the ONU service stop state in the ONU management information (S412). When the shutdown command is not normally performed, the OLT channel manager 303 transmits the result of the abnormal operation to the operator terminal device 132.

The OLT channel manager 103 generates a report message for the execution result of the shutdown command (S414), and transmits the generated report message to the operator terminal device 132 (S416). The operator terminal device 132 displays the received report message to the operator through the display device (S418). The reporting message includes information that the execution result of the command is normal or an error has occurred.

When the operator inputs the channel setting command through the operator terminal device 132 after the shutdown command for the ONU is normally performed, the operator terminal device 132 transmits the input channel setting command to the OLT channel manager 303 ( S420). The channel setup command includes the new IP addresses of the OLT and ONU. The OLT IP address specifically represents an address of an OLT port.

The OLT channel manager 303 generates an IPC frame including the IP addresses (S422), and transmits the generated IPC frame to the corresponding ONU channel managers 307, 309, and 311 (S424). The ONU channel managers 307, 309 and 311 change the IP address of the ONU and the IP address of the OLT to which the ONU is connected according to the IP address included in the IPC frame (S426). The ONU channel managers 307, 309 and 311 generate a response frame for the new IP address setting result (S428), and transmit the generated response frame to the OLT channel manager 303 (S434).

The OLT channel manager 303 analyzes the received response frame to determine the result of performing the IP address change in the ONU (S432). In addition, the OLT channel manager 303 changes the channel information from the OLT and ONU IP addresses included in the channel setting command to the transceiver side address of the new communication channel (S432).

The OLT channel manager 303 generates a report message for the ONU and the OLT execution result for the channel setting command (S434), and transmits the generated report message to the operator terminal device 132 (S436). The operator terminal device 132 displays the received report message to the operator through the display device (S438).

Since the communication channel is set up according to the new IP address by the above method, after setting the communication channel of the ONU by OLT, change the port to which the ONU is physically connected and change the channel setting of the ONU directly at the location where the ONU is located. It solves the shortcomings.

The operator inputs a command for instructing service restart of the ONU through the operator terminal device 132 after channel setting. The service resume command is the same as that of the shutdown command described above, except that the command is changed from service stop to service resume.

5A and 5B illustrate a structure of a frame transmitted and received between an OLT and an ONU according to the present invention.

FIG. 5A illustrates the structure of the request frame 500 and the response frame 520 for the shutdown command, and FIG. 5B illustrates the structure of the request frame 540 and the response frame 560 for the channel change command.

Referring to FIG. 5A, the structure of the request frame 500 for the shutdown command is composed of the message ID 502, the ONU ID 504, and the blocking information 506, and the response frame 520 from the ONU for the shutdown command. ) Consists of a message ID 522, a result field 524, and an ONU ID 526.

The message IDs 502 and 522 are fields for discriminating the type of the frame and distinguish whether the frame relates to a shutdown command or a channel setup command. The ONU ID 504 indicates an ONU to which a frame is transmitted, and the blocking information 506 is information for instructing service interruption or service restart of the ONU corresponding to the ONU ID 504. For example, if the blocking information is set to 1, the service interruption of the ONU is instructed. If the blocking information is set to 0, the service resumption of the ONU is instructed.

The message ID 522 of the response frame for the shutdown command is the same as the contents of the shutdown command frame, the ONU ID 526 is identification information of the ONU transmitting the response frame, and the result field 524 is the result of performing the shutdown command. Is stored, 1 indicates normal performance and 0 indicates an error.

Referring to FIG. 5B, the request frame 540 for the channel change command includes a message ID 542, an ONU ID 544, a new IP address 546 of the ONU, and a new IP address 548 of the OLT. The response frame 560 for the channel change command is composed of a message ID 562, a result field 564, and an ONU ID 566.

The message IDs 542 and 562 identify which command the frame is for, and the ONU ID 544 indicates the ONU to which the frame is forwarded, and the new IP addresses 546 and 548 of the ONU and OLT indicate the new IP address for the channel change. . The ONU changes the channel information to the new IP address received by the frame.

Since the response frame 560 for the channel change command is the same as the response frame 520 for the shutdown command, a detailed description thereof will be omitted.

6 illustrates an example of channel information before and after channel change according to the present invention.

FIG. 6 illustrates an example of a change in channel information according to the channel change of FIG. 3B. The channel information 600 of the ONU included in the splitter and the ONU when the splitter is changed to another port in the OLT before the channel change are shown. Channel information 610 is shown.

Referring to FIG. 6, the ONU ID is identification information of the ONU, the Slot No is identification information of the PON Card in the OLT to which the ONU is connected, and the Port No is port identification information in the PON Card. The ONU IP address is the address assigned for communication with the OLT.

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, when a local station (ONU) connected to a specific port of the mother station apparatus (OLT) is changed to another port in the OLT, the operator must change channel information of the ONU directly at the location where the ONU is installed. To solve the problem. In addition, since the OLT remotely changes the channel information with the ONU, the operation management cost of the ONU is reduced and the channel information can be easily changed.

Claims (8)

A command receiving unit for receiving a channel setting command including an address of an own station (ONU) and an address of a port connected to the ONU from the outside; A frame generation unit generating a frame including the addresses in response to a predetermined communication protocol set for communication with the ONU; A frame transmitter which transmits the generated frame to the ONU using the communication protocol; And And a channel setting unit configured to set a communication channel with the ONU based on the address of the ONU and the address of the port. The method of claim 1, Wherein the address of the ONU and the address of the port are IP (Internet Protocol) addresses uniquely assigned to respective devices and ports in a passive optical network to which the ONU belongs. The method of claim 1, The frame generation unit generates a frame in the form of an IPC (Inter Process Communication) message that can be recognized in the process of the ONU, And the frame transmitting unit transmits the IPC frame using User Datagram Protocol (UDP). The method of claim 1, When the command receiving unit receives a shutdown command including blocking information indicating service termination or service resumption of the ONU, And the frame generation unit generates a frame including the blocking information. (a) receiving a channel setting command including an address of an ONU and an address of a port connected to the ONU from an external source; (b) generating a frame comprising the addresses in correspondence with a predetermined communication protocol configured for communication with the ONU; (c) transmitting the generated frame to the ONU using the communication protocol; And (d) establishing a communication channel with the ONU based on the address of the ONU and the address of the port. The method of claim 5, Before step (a), (h) receiving a command instructing service termination of the ONU; (i) generating a frame containing the service interruption command; And (j) transmitting the frame to the ONU. The method of claim 6, (k) receiving a command instructing to resume service of the ONU; (l) generating a frame containing the resume service command; And (m) transmitting the frame to the ONU via a communication channel set to the addresses. (a) receiving a channel setting command including an address of an ONU and an address of a port connected to the ONU from an external source; (b) generating a frame comprising the addresses in correspondence with a predetermined communication protocol configured for communication with the ONU; (c) transmitting the generated frame to the ONU using the communication protocol; And (d) establishing a communication channel with the ONU based on the address of the ONU and the address of the port; a computer-readable recording recording a program for executing the channel setting method on a computer. media.

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