KR20130072793A - Method for dynamic managing of onu and wdm-pon system for the same - Google Patents

Abstract

PURPOSE: A dynamic management method of an optical network unit (ONU) and a wavelength division multiplexing-passive optical network (WDM-PON) system for the same are provided to dynamically manage an ONU. CONSTITUTION: In an inter process communication (IPC) between an optical line termination (OLT) (100) and an ONU (200), a signal is transmitted using a unicast MAC address. An IPC route to the ONU is determined by ONU alarm information including state information about a link failure and IPC failure to the IPC route. The ONU replays IPC data including the MAC address of a destination, which is not the same with the MAC address of the ONU, to a management port that is the opposite of a management port receiving the IPC data. [Reference numerals] (110) Main control unit; (121) Open link server; (210) Open link client

Description

OND dynamic management method and WMD-PON system for the same method {METHOD FOR DYNAMIC MANAGING OF ONU AND WDM-PON SYSTEM FOR THE SAME}

The present invention relates to a WDM-PON system, and more particularly, to a method capable of dynamically managing an optical network unit (ONU) and a WDM-PON system therefor.

An optical communication system using a wavelength division multiplexing access (WDMA) is a method of transmitting and receiving optical signals of different wavelengths output from a plurality of optical transceivers through a single optical fiber using a wavelength division multiplexing device. The wavelength division multiple access can transmit a large amount of data at the same time, thereby increasing the bandwidth between the transmission intervals, and the rental cost of the optical line by transmitting data using one optical fiber instead of using multiple optical fibers And there is an advantage to save the maintenance cost.

Wavelength division multiplexing passive optical networks (WDM-PON) offer the benefits of greater bandwidth, higher security, easier scalability, and higher transmission speeds and protocol transparency. It is recognized as a net.

The wavelength division multiplex passive optical subscriber network, which can extend the transmission capacity by using several wavelengths simultaneously in one optical fiber, has a central office (CO) and optical subscribers, a central office (CO) and each optical subscriber. It consists of an optical distribution network (optical distribution network) connecting. The central management office (CO) corresponds to the bureau within the telephone office or the operating station of the MSO (Multi System Operator), and provides the necessary information to subscribers through interworking with external wired and wireless networks through OLT (Optical Line Termination), and maintains the entire subscriber network. It plays an overall role in maintenance, surveillance control and operation. The optical distribution network is composed of a remote node (RN) and an optical cable, which are composed of passive optical elements such as a wavelength division optical multiplexer / demultiplexer and an optical splitter for splitting an optical signal without power supply. The remote node is located outside of the subscriber (electric pole, outdoor terminal box) or in a manhole or building. The ONU (Optical Network Unit) is located in the subscriber's home, and the subscriber terminal is connected to the ONU. The wavelength division multiplexed optical signal is transmitted through a single optical cable between the central office and the remote node, and a specific wavelength per optical subscriber is assigned by the remote node. Wavelength division multiplexing passive optical subscriber networks require multiple light sources of different wavelengths to allocate one or more wavelengths per subscriber.

ONU manages the upper level by letting the equipment recognize specific value such as H / W dip switch or by giving IP (internet protocol) value through console connection when deploying. However, if the ONU is managed from a higher level, problems due to configuration errors may occur. In addition, multicast destination MAC is used for L2 Management Inter Process Communication (IPC) .In order to relay wire-speed from OLT to ONU, it recognizes specific ID value of each ONU and restarts the CPU. Redirection must be made. In case of using the standard Multicast destination MAC, there is a problem that the values can be overlapped even if the reserve area is used. In the case of a low-end chipset, the corresponding field cannot be specified. have.

Korean Patent Publication No. 2011-0063034 (June 10, 2011)

The present invention provides a method capable of dynamically managing an optical network unit (ONU) and a WDM-PON system therefor.

The WDM-PON system of the present invention transmits a signal using a unicast Mac address in IPC (inter process communication) communication between an optical line termination (OLT) and an optical network unit (ONU).

In addition, the ONU dynamic management method of the present invention, a) exchanging unicast MAC address (unicast MAC address) information between the optical line termination (OLT) and optical network unit (ONU); And b) forming a topology based on ONT registration and registration data using the unicast MAC address information; And c) performing inter process communication (IPC) communication between the OLT and ONU using the topology.

According to the present invention, a signal can be transmitted at wire speed in communication between an OLT and an ONU. In addition, it is possible to define a protocol for sharing the necessary information between the OLT and ONU.

1 is an exemplary view showing the configuration of a WDM-PON system according to an embodiment of the present invention.
Figure 2 is an exemplary view showing a command for setting the ONU environment in accordance with an embodiment of the present invention.
3 is an exemplary view showing the configuration of an annular optical transmission network according to an embodiment of the present invention.
4 illustrates an EFM OAM information PDU format according to an embodiment of the present invention.
5 is an exemplary view showing a structure of an annular optical transmission network and a processing method when a link is down according to an embodiment of the present invention.
6 is an exemplary diagram showing a data structure and a procedure for managing information of the interface unit 120 according to an embodiment of the present invention.
7 is an exemplary view showing the configuration of a WDM-PON system according to an embodiment of the present invention.
8 is a flow chart showing a procedure of a communication protocol registration process triggered in the ONU according to an embodiment of the present invention.
9 is a flowchart illustrating a procedure of a registration data processing procedure in an OLT interface unit according to an embodiment of the present invention.
10 is an exemplary view showing a port down of the WDM-PON system according to an embodiment of the present invention.
11 is a flow chart showing a processing procedure in the ONU and OLT at the time of port down according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail if they obscure the subject matter of the present invention.

In this embodiment, a method for setting an ONU in an optical line termination (OLT) and an OLT as a component for managing an optical network unit (ONU) in a ring or daisy chain structure. Define protocol to share necessary information between ONU and ONU.

1 is an exemplary view showing the configuration of a wavelength division multiplexing passive optical network (WDM-PON) system according to an embodiment of the present invention.

As shown in FIG. 1, the OLT 100 includes a main control unit (MC) 110 for setting and executing a command and an interface unit (PI) for performing an interface with the ONU 200 (PI). 120). The interface unit 120 includes an open link server 121 and an EFM OAM (Ethernet in the First Mile Operation, Administration, and Maintenance) 122. The EFM OAM 122 is a device for point-to-point protocol between adjacent devices, and the signal using the EFM OAM protocol is terminated by one hop. In one embodiment, one OLT 100 may mount up to eight interface units 120. The ONU 200 also includes an open link client 210 for communication with the open link server 121 of the OLT 100 and an EFM OAM 220 for EFM OAM communication.

The configuration performed in the OLT 100 main controller 110 should be composed of a complete annular structure or a serial connection structure in the step of actually applying the command. 2 is an exemplary view showing a command for setting an ONU environment according to an embodiment of the present invention.

The OLT 100 uses an ONU ID of a string data type as a method of identifying at least two ONUs 200, and an interface adjacent to each management interface with configuration information of each ONU (eg, For example, an OLT interface ID is specified when neighboring an OLT and a corresponding neighbor ONU ID when neighboring another ONU. Each ONU 200 may include two management interfaces.

In this embodiment, the communication between the OLT 100 and the ONU 200 does not use a multicast destination Mac address, but transmits a signal using a unicast Mac address. In each ONU on the path for confirmation, the process of redirecting and relaying to the CPU can be omitted, thereby improving transmission speed.

3 is an exemplary view showing the configuration of an annular optical transmission network according to an embodiment of the present invention.

Referring to FIG. 3, an IPC path (inter process communication path) for the ONU 200 is determined by ONU alarm information. For convenience, the lower slot or lower interface number of the interface unit 120 is referred to as the east path, and the higher slot or higher interface number is westward. Called the west path. If both west and east routes are in a normal state, the default setting is to perform the IPC using the east route, and if one of the west and east routes is abnormal, set IPC to use the other route in the normal state. Can be. The ONU alarm information includes status information about the IPC path, such as link failure and IPC failure for each path.

In this embodiment, the IPC between the OLT 100 and the ONU 200 designates a unicast destination MAC address as a destination MAC address, and thus a procedure for exchanging and registering MAC addresses between each other is required. . The OLT 100 and the ONU 200 form a topology based on ONT registration and registration data using unicast MAC address information, and the OLT 100 using the formed topology. And the inter process communication (IPC) communication between the ONU 200.

The ONU 200 sets QoS rules so that only the IPC data that matches its MAC address is redirected to the CPU so that the IPC data is transmitted at the line speed in the path of the annular or serial connection structure. In the ONU 200, IPC data including a destination MAC address that does not match its MAC address is relayed to a management port opposite to the management port that received the data, and in the OLT 100, an IPC having an annular structure is relayed. Because this is the end of the route, IPC data containing a destination MAC address that does not match its MAC address can be set to drop.

The following is a QoS rule that should be set in the ONU 200 and the OLT 100 to perform IPC. Rule 1 has a higher priority than Rule 2, and Rule 2 has a higher priority than Rule 3.

QoS rules set in the ONU

Rule 1. 802.3ah EFM-> redirect to CPU

Rule 2. If the unicast destination MAC address matches the ONU (200) MAC address (Unicast DMAC (byte 1: 6) matching this ONU MAC) and the ethertype is 0x8809 (byte 13:14) appointed

Rule 3. Extra rule to avoid VLAN 1 reservation: The unicast destination MAC address does not match the ONU (200) MAC address. If it is 0x8809, it redirects to the management port opposite the management port that received the data.

QoS rules set in the OLT

Rule 1. Redirect to 802.3ah EFM-> CPU

Rule 2. Unicast destination MAC address matches OLT (100) interface 120 port MAC address (Unicast DMAC (byte 1: 6) matching this PI port MAC), and Ethertype is 0x8809 (byte 13:14) Redirect to CPU

Rule 3. If the unicast destination MAC address is inconsistent with the interface part 120 port MAC address (Unicast DMAC (byte 1: 6) not matching this PI port MAC), and the ether type is 0x8809 (byte 13:14), the corresponding data Drop.

The OLT 100 uses a registration process of Openlink, which is a specific communication protocol, to grasp the configuration of the ONU 200 that is actually deployed. During the registration process, each ONU 200 reports its MAC address and information about the neighbor ONU 200 to the OLT 100, and the OLT 100 uses the reported information to identify the ONU topology. Configure

The ONU 200 uses the protocol data unit (PDU) of the IEEE 802.3ah EFM OAM to register the MAC address of the OLT 100 and to obtain information about the neighbor ONU 200. 4 is an exemplary diagram illustrating an EFM OAM PDU format according to an embodiment of the present invention.

Each ONU 200 periodically checks the port MAC address of the OLT 100 interface 120 of the corresponding path and the MAC address information of the adjacent ONU 200 to the EFM OAM 122 of the interface 120. In the Organization Specific TLV field (F) of the EFM OAM PDU, the EFM OAM 220 has its own port MAC address and the server MAC address of the server side (interface part 120). Port MAC address of the OLT 100 received from the OAM 122). Since the EFM OAM is a point-to-point protocol between adjacent devices, it is terminated by one hop, so the port MAC address of the OLT 100 interface 120 is propagated through the section-specific EFM OAM. I use it.

The data received from the ONU 200 adjacent to the OLT 100 has the same port MAC address of the EFM OAM 122 and the port MAC address of the server. The port MAC address on the server side is clear before receiving the value (00: 00: 00: 00: 00: 00) and if the link is down, the MAC address of the neighbor ONU received on the link The server side port MAC address value is cleared.

5 is an exemplary view showing a structure of an annular optical transmission network and a processing method when a link is down according to an embodiment of the present invention, and FIG. 6 is data for managing information of the interface unit 120 according to an embodiment of the present invention. An illustration showing the structure and procedure.

The OLT 100 interface unit 120 may determine an alarm state by comparing an operator configuration configuration received from the main controller 110 with information on the actual configured ONU topology received from the ONU 200. The information received from the ONU 200 is configured through the registration process of the open link, and the registration process of the open link is triggered by the OLT 100 interface unit 120 and when triggered by the ONU 200. Is present. The triggering in the ONU 200 and the triggering in the interface unit 120 will be described with reference to FIG. 7.

-When triggered from ONU

8 is a flowchart showing a procedure of a communication protocol registration process triggered in the ONU 200 according to an embodiment of the present invention. When the MAC address of the neighbor ONU 200 or the MAC address of the server side is changed, the corresponding ONU 200 transmits registration data to the OLT 100. However, when the MAC address of the ONU 200 is cleared or the MAC address of the server is cleared, since the link is down or there is no destination to send registration data, the registration data is not transmitted. If the OLT 100 receives the registration data, it determines whether to permit registration based on the configuration data, and transmits a registration acknowledgment or disapproval message to the ONU 200 and the registration process is terminated.

-When triggered on the OLT interface

9 is a flowchart showing a procedure of a registration data processing procedure in the OLT 100 interface unit 120 according to an embodiment of the present invention. The ONU 200 ID or ONU 200 registration data corresponding to the same position in the cfg-topology list indicating the values for the ONU 200 set by the operator in the main control unit 110 of the OLT 100 is displayed. If changed, the register Init message is transmitted to the DMAC of the ONU 200 existing at the corresponding position of the reg-topology list indicating values for the ONU 200 reported from the ONU 200. . Upon receiving the registration request message, the ONU 200 transmits the registration data to the OLT 100, and when the registration data is received, the OLT 100 determines whether to permit registration based on the environment setting data to approve registration (Register Ack). Alternatively, the Nack message is transmitted to the ONU 200, and the registration process ends. When the location of the ONU 200 is changed, the registration process is triggered by the link down-up because the link topology needs to be changed in the actual topology. Two factors, serial number and ONU type, decide whether to allow registration.In case of auto registration, the serial number is fixed to the ONU serial number registered first. Before off, registration is allowed only with the ONU serial number registered first. If it is not automatic registration, registration is allowed only when the configuration value is null or when the configuration value and the reported value match. The ONU type requires registration only if the configuration value and the reported value match.

10 is an exemplary view showing a port down of the WDM-PON system according to an embodiment of the present invention, Figure 11 is a flow chart showing the processing procedure in the ONU and OLT when the port down according to an embodiment of the present invention.

 If port-x on the ONU-4 goes down, the ONU-4 reports the port down event to the OLT using the port-y path. Port down event reporting to the OLT 100 continues until an acknowledgment message is received from the OLT 100.

Even if NLT processing (PEC or serial mismatch) that rejects registration in the open link registration process is performed in the OLT 100, the management port of the ONU whose registration is rejected by providing a path to register the ONU connected to the lower portion of the ONU. As a management method for, process with ONU ID for the location.

While the above methods have been described through specific embodiments, the methods may also be implemented as computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily deduced by programmers of the present invention.

Although the present invention has been described in connection with some embodiments thereof, it should be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention as understood by those skilled in the art. something to do. It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

100: OLT 110: main fisherman
120: interface unit 121: open link server
122,220: EFM OAM 210: Open Link Client

Claims (14)

A wavelength division multiplexing passive optical network (WDM-PON) system,
WDM-PON system for transmitting signals using a unicast Mac address in IPC (inter process communication) communication between optical line termination (OLT) and optical network unit (ONU). The method of claim 1,
IPC path for the ONU,
WDM-PON system, determined by the ONU alarm information including the link failure for the IPC path and status information about IPC failure. The method of claim 1,
The ONU relays IPC data including a destination MAC address that does not match its MAC address to a management port opposite the management port that received the IPC data,
And the OLT is configured to drop IPC data including a destination MAC address that does not match its MAC address. The method of claim 1,
The OLT and the ONU,
WDM-PON system, connected in a ring or daisy chain structure. The method of claim 1,
The OLT is,
WDM-PON system using a registration process of the communication protocol (protocol) to grasp the topology configuration of the ONU. The method of claim 5,
The registration process of the communication protocol,
Triggered at the interface portion of the OLT or triggered at the ONU. The method of claim 1,
The ONU,
And register a MAC address of the OLT and use a protocol data unit (PDU) to obtain information about a neighboring ONU. As an optical network unit (ONU) management method,
a) exchanging unicast MAC address information between an optical line termination (OLT) and an optical network unit (ONU); And
b) forming a topology based on ONT registration and registration data using the unicast MAC address information; And
c) performing inter process communication (IPC) communication between the OLT and ONU using the topology. 9. The method of claim 8,
IPC path for the ONU,
And determined by ONU alarm information including link failure for the IPC path and status information about IPC failure. 9. The method of claim 8,
The step c)
The ONU relays IPC data including a destination MAC address that does not match its MAC address to a management port opposite the management port that received the IPC data,
Setting the OLT so that IPC data including a destination MAC address that does not match its MAC address is dropped. 9. The method of claim 8,
The OLT and the ONU,
ONU management method connected in a ring structure or daisy chain structure. 9. The method of claim 8,
The OLT is,
And a registration process of a communication protocol to grasp the topology configuration of the ONU. The method of claim 12,
The registration process of the communication protocol,
And triggered at the interface portion of the OLT or triggered at the ONU. 9. The method of claim 8,
The ONU,
Using a protocol data unit (PDU) to register the MAC address of the OLT and obtain information about a neighboring ONU.

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