KR102052598B1 - Ethernet passive optical network system and optical communication apparatus of passive optical network - Google Patents

Abstract

An optical fiber terminator connecting the backbone network and the subscriber network to each other and terminating an optical signal; An optical switch connected to the optical path terminator and the optical path; An optical communication device connected to the optical switch to receive an optical signal from an optical fiber terminator; An optical multiplexing device for receiving an optical signal from an optical communication device, for branching the received optical signal and transferring the received optical signal to a plurality of subscriber devices; And an Ethernet Passive Optical Network (EPON) system according to an embodiment of the present invention, comprising a management server for remotely managing an optical communication device.

Description

EPOON system and POON-based optical communication device {ETHERNET PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL COMMUNICATION APPARATUS OF PASSIVE OPTICAL NETWORK}

The present invention relates to the field of wired networks. More specifically, the present invention relates to an EPON system and a PON based optical communication device in the wired network field.

With the rapid increase in Internet traffic and the establishment of integrated wired and wireless networks, the development of optical subscriber technology represented by fiber-to-the-home (FTTH) is accelerating. PON (Passive Optical Network) technology, which leads the FTTH market, is a point-to-multipoint-based optical subscriber technology that uses passive branch devices that do not require power supply as remote nodes (RN).

In addition to providing high bandwidth to subscribers, PON technology is widely used due to the advantage that the OSP (Outside Plant) consists only of passive components, which can greatly reduce the operation cost of the network.

The PON technology is classified into two types according to the difference of multiplexing and multiple access methods. The first is Time Division Multiplexing (TDM) -PON based on time division multiplexing, and the second is Wavelength Division Multiplexing (WDM) based on wavelength division multiplexing. -PON. Here, the TDM-PON includes B-PON (Broadband PON) standardized by ITU-T, Gigabit-capable PON (G-PON), and E-PON (Etherent PON) standardized by IEEE.

Recently, ITU-T and IEEE have evolved each PON standard to 10G speed class to meet user's bandwidth requirements and completed the relevant standard.

An EPON system and a PON-based optical communication apparatus according to an embodiment of the present invention aim to reduce the number of optical cores in constructing an FTTH network.

In addition, the EPON system and the PON-based optical communication apparatus according to an embodiment of the present invention aims to build an FTTH network at low cost.

In addition, the EPON system and the PON-based optical communication device according to an embodiment of the present invention aims to efficiently manage a plurality of optical communication devices.

EPON system according to an embodiment of the present invention,

An optical fiber terminator connecting the backbone network and the subscriber network to each other and terminating an optical signal; An optical switch connected to the optical path terminator and the optical path; An optical communication device connected to the optical switch to receive an optical signal from the optical path terminator; An optical multiplexing device for receiving an optical signal from the optical communication device, for branching the received optical signal and transferring the received optical signal to a plurality of subscriber devices; And it may include a management server for remotely managing the optical communication device.

The optical fiber termination device includes: a switch subscriber unit providing a switch interface with downlink equipment; And a switch controller configured to route an optical signal connected through switching at the switch subscriber unit.

The optical fiber termination device is located in a national company, and the optical communication device may be located in a main distribution frame (MDF) or a communication box (BBx).

The management server may be connected to the optical communication device through an internet protocol (IP) network.

When the IP packet is received from the management server, the optical communication device converts the received IP packet into an Ethernet packet and transmits the received IP packet to the optical multiplexing device. When the Ethernet packet is received from the optical multiplexing device, the optical packet receives the IP packet. The packet can be converted into a packet and transmitted to the management server.

The IP packet received from the management server may be a control packet for the plurality of subscriber apparatuses, and the Ethernet packet received from the optical multiplexing apparatus may be response packets of the plurality of subscriber apparatuses.

The management server may include a control packet for topology management between the optical communication device and the plurality of subscriber devices, a control packet for bandwidth allocation of the optical communication device, and protocol settings for the optical communication device and the plurality of subscriber devices. A control packet for a control packet, a control packet for checking traffic statistics of each of the plurality of subscriber apparatuses, a control packet for diagnosing a communication state between the optical communication apparatus and the plurality of subscriber apparatuses, and a control packet for the optical communication apparatus and the plurality of subscriber apparatuses. At least one of control packets for software upgrade may be transmitted to the optical communication device.

The optical communication apparatus and the optical multiplexing apparatus may be provided in plural, and the optical multiplexing apparatus may be arranged to correspond to each of the plurality of optical communication apparatuses.

There are a plurality of management servers, and the EPON system may determine the number of optical communication devices that each of the plurality of management servers should be remotely managed from among the plurality of optical communication devices based on the load degree of each of the plurality of management servers. .

The optical communication device may be implemented in a stick type or a card type.

An optical communication apparatus according to another embodiment of the present invention,

It is connected to the optical fiber terminator and the optical switch connected by the optical path connected to the backbone network and the subscriber network, and when the optical signal is received from the optical fiber terminal device, the received optical signal is transmitted to the optical multiplexing device, The optical signal branched by can be transmitted to a plurality of subscriber devices.

The optical communication device may be remotely managed by a management server.

Some effects that can be achieved by the EPON system and the PON-based optical communication device according to an embodiment of the present invention are as follows.

i) It is possible to reduce the number of optical cores in building the FTTH network.

ii) FTTH network can be built at low cost.

iii) It is possible to efficiently manage several optical communication devices.

However, the effects that can be achieved by the EPON system and the PON-based optical communication device according to an embodiment of the present invention are not limited to those mentioned above, and other effects that are not mentioned are included in the following description. It will be clearly understood by those skilled in the art.

1 is a diagram illustrating a general EPON system.
2 is a diagram illustrating an EPON system according to an embodiment of the present invention.
3 is a diagram illustrating a process of transmitting and receiving a packet between a management server, an optical communication device, and a subscriber device.
4 is a diagram illustrating a hierarchical structure of each of a plurality of management servers.
5 (a) and 5 (b) are diagrams showing an embodiment of an optical communication device according to an embodiment of the present invention.

The present invention may be variously modified and have various embodiments, and specific embodiments are illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the numbers (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, the components represented by '~ unit (unit)', 'module', etc. in the present specification means a hardware component, such as software, FPGA or ASIC, this component plays a role. However, components are not meant to be limited to software or hardware. The component may be configured to be in an addressable storage medium. In addition, two or more components may be combined into one component, or one component may be divided into two or more for each of the more granular functions. In addition, each component to be described below may additionally perform some or all of the functions of other components in addition to the main functions of which they are responsible, and some of the main functions of each of the components may be different. Of course, it may be carried out exclusively by the component.

Hereinafter, exemplary embodiments according to the spirit of the present invention will be described with reference to the drawings.

1 is a diagram illustrating a general EPON system.

1, a typical EPON system includes an optical line terminal (OLT: 10), a main distribution frame (MDF) or a communication box (BBx, ex. BBC: Broad Cast Cabinet, An optical multiplexing device 20 and a plurality of subscriber units (ONT: Optical Network Terminal or ONU: Optical Network unit, 30) located in BBS: Broad Cast Shelter and BBH: Broad Cast House.

The optical fiber terminal 10 serves to terminate the optical signal in the national office. As shown in FIG. 1, the optical fiber terminator 10 includes a plurality of PON subscriber units 11. Each of the plurality of PON subscriber units 11 may provide a PON subscriber interface, and performs connection with a subscriber device 30 which is a downlink device.

Each of the PON subscriber units 11 is connected to the optical multiplexing device 20, and the optical multiplexing device 20 is connected to the plurality of subscriber devices 30. Each subscriber device 30 may use an optical service through an optical signal received from the optical fiber terminator 10 via the optical multiplexing device 20.

Currently, according to the evolution of the network structure, an access network using a large-capacity optical fiber terminator 10 capable of supporting a 10 Gbps transmission rate has been proposed, and a wide range of national affairs is suitable to accommodate the capacity of the large-capacity optical fiber terminator 10. The facility is mainly built. Here, in the case where the large-capacity optical fiber terminator 10 is installed in the wide-area company, the demand of a long-distance optical core extending to each main distribution board or communication box may additionally occur. That is, in the case of using the method as shown in FIG. 1, a problem may occur such that an excessive amount of optical cores must be newly installed.

In order to solve this problem, it is also possible to consider a method of forwardly arranging the large-capacity optical fiber termination device 10, but considering the cost compared to the capacity, excessive investment cost may be a problem. That is, in the case of the large-capacity optical fiber terminator 10, up to 5000 subscribers can be accommodated, but in the case of the forward arrangement, since the appropriate capacity is about 500 subscribers, the cost required for the forward arrangement of the large-capacity optical fiber terminator 10 is sufficient. Compared with the effect that can be obtained may be insignificant.

2 is a diagram illustrating an EPON system 200 according to an embodiment of the present invention.

Referring to FIG. 2, the EPON system 200 according to an embodiment of the present invention may include an optical fiber terminal 210, an optical switch 220, a plurality of optical communication devices 230, and a plurality of optical multiplexing devices 250. And a plurality of subscriber devices 270 and a management server 290.

The optical fiber terminal 210 connects a backbone network and a subscriber network to each other and terminates an optical signal. The optical fiber terminator 210 may include a switch controller 212 and a switch subscriber unit 214. The optical fiber terminal 210 is located in the national company.

The switch control unit 212 may perform operation management of the switch subscriber unit 214, and may route and secure each optical signal connected through switching at the switch subscriber unit 214. The switch subscriber unit 214 provides a switch interface with the downstream equipment.

Although not shown in the figure, the optical fiber terminal 210 may further include a switch network unit that provides an interface for connection with upstream equipment.

The optical switch 220 is a switch for converging purposes, and distributes an optical signal transmitted from the optical path terminator 210 to each of the plurality of optical communication devices 230 or receives the optical signals transmitted from the plurality of optical communication devices 230. The light is collected and transmitted to the optical path terminator 210. The optical switch 220 and the optical path terminator 210 may be connected by one optical path. In FIG. 2, the optical switch 220 is illustrated as being disposed in the main cabinet or the communication box, but the optical switch 220 may be disposed outside the main cabinet or the communication box.

The optical communication device 230 may be connected to the optical switch 220 to provide a PON subscriber interface, and may perform one-to-many (1: N) connection with a subscriber device 270 which is a downlink device. The optical communication device 230 may be implemented as a stick type or a card type and connected to the optical switch 220.

The optical communication device 230 may perform the same function performed by the PON subscriber unit 11 of FIG. 1. In other words, in the EPON system 200 according to an embodiment of the present invention, the conventional PON subscriber unit 11 is removed from the optical ray terminator 210, and the optical communication device in which the function of the PON subscriber unit 11 is implemented. 230 is disposed outside of the optical path terminator 210, for example, a main wiring board or a communication box. By arranging the optical communication device 230 forward and connecting the optical communication device 230 to the optical switch 220 in a large bandwidth optical path, the number of optical cores is reduced compared to the EPON system 200 shown in FIG. You can.

The optical multiplexing device 250 receives an optical signal from the corresponding optical communication device 230, and branches the received optical signal to the plurality of subscriber devices 270.

The management server 290 remotely manages the optical communication device 230. In detail, the management server 290 performs setting, management, and diagnosis of the optical communication device 230 and the subscriber device 270 on a cloud basis. While the optical fiber terminal device 210 and the optical communication device 230 are connected by Ethernet, the management server 290 is connected to the optical communication device 230 through an IP (internet protocol) network.

The management server 290 may transmit a control packet to the optical communication device 230, which is a control packet for topology management between the optical communication device 230 and the plurality of subscriber devices 270, the optical communication device A control packet for bandwidth allocation of 230, a control packet for protocol setting for the optical communication device 230 and the plurality of subscriber devices 270, a control packet for checking traffic statistics of each of the plurality of subscriber devices 270, A control packet for diagnosing a communication state between the optical communication device 230 and the plurality of subscriber devices 270 and a control packet for software upgrade of the optical communication device 230 and the plurality of subscriber devices 270. Here, topology management is management of a connection relationship between the optical communication device 230 and the plurality of subscriber devices 270. When a plurality of subscriber devices 270 are connected to a specific optical communication device 230, Grouping the subscriber devices 270 into at least one group. The management server 290 may set common profile settings, bandwidth settings, and the like for subscriber devices 270 belonging to each group. In addition, the profile setting includes an uplink rate setting, a downlink rate setting, a quality of service (QoS) setting, a virtual local area network (VLAN) setting, and the like. The diagnosis of the communication state also includes diagnosis of the light output, the light signal state, and the like. In addition, the management server 290 may further perform a dynamic bandwidth allocation (DBA) operation.

The optical communication device 230 may transmit a response packet to the management server 290 with respect to the control packet from the management server 290. The response packet may be generated by the optical communication device 230 itself or generated by the subscriber device 270 and transmitted to the optical communication device 230.

When the optical fiber terminal 210 and the optical communication device 230 are connected by Ethernet, and the management server 290 and the optical communication device 230 are connected through an IP (internet protocol) network, the management server 290, optical communication A process of transmitting and receiving a packet between the device 230 and the subscriber device 270 will be described with reference to FIG. 3. In FIG. 3, the control IP packet and the response IP packet mean a control packet and a response packet transmitted and received in the IP network, and the control Ethernet packet and the response Ethernet packet mean a control packet and response packet transmitted and received in the Ethernet network.

① The management server 290 transmits the control IP packet to the optical communication device 230. ② If there is information to be answered, the optical communication device 230 includes the information in the response IP packet and transmits it to the management server 290. The optical communication device 230 converts the control IP packet into a control Ethernet packet, and transmits the control Ethernet packet to the subscriber device 270 through the optical multiplexing device 250. ⑤ The subscriber device 270 includes information to be responded to in the response Ethernet packet and transmits it to the optical communication device 230 through the optical multiplexing device 250. ⑥ The optical communication device 230 transmits the response Ethernet packet to the response IP. Convert to a packet. ⑦ The optical communication device 230 transmits the response IP packet to the management server 290.

Meanwhile, when there are a plurality of management servers 290 in the EPON system 200 according to an embodiment of the present invention, the EPON system 200 may further include a control server.

The control server may collect the degree of load of each of the plurality of management servers 290 and adjust the number of optical communication devices 230 to be managed by each management server 290 based on the collected load degree. The control server may collect at least one of the number of the optical communication devices 230 currently managed by each of the management servers 290, the degree of CPU usage, and the memory occupancy rate as the load of each management server 290. For example, when the first management server 290 currently manages three optical communication devices 230, and the second management server 290 currently manages one optical communication device 230, the first management When the load degree of the server 290 is greater than the load degree of the second management server 290, the control server causes the first management server 290 to manage one optical communication device 230, and the second management server ( 290 may manage three optical communication devices 230. The control server may provide a web-based operation management user interface (UI) to the administrator.

In some implementations, the control server may be omitted in a situation where a plurality of management servers 290 exist. In this case, each of the plurality of management servers 290 may share the load of each other and cooperate to adjust the number of optical communication devices 230 to be managed by each management server 290.

4 is a diagram illustrating a hierarchical structure of each of the plurality of management servers 290-1 to 290-n.

As shown in FIG. 4, each of the plurality of management servers 290-1 to 290-n may be divided into a hardware layer, a virtualization layer, and a service layer. Among the virtualization layers, Orchestrator makes efficient use of the management server's hardware resources. The Orchestrator shares the degree of load of other management servers to determine which management server manages how many optical communication devices 230.

5 (a) and 5 (b) are diagrams showing an embodiment of the optical communication device 230 according to an embodiment of the present invention.

Optical communication device 230 according to an embodiment of the present invention is implemented as a stick (stick), as shown in Figure 5 (a), or as shown in Figure 5 (b), card (card) type It can be implemented as. The stick type or card type optical communication device 230 may be mounted and operated in a layer 2 (L2) switch or the like.

The EPON system and the PON-based optical communication device according to an embodiment of the present invention can reduce the number of optical cores in constructing the FTTH network and can construct the FTTH network at low cost. In addition, the EPON system and the PON-based optical communication device according to an embodiment of the present invention can efficiently manage a plurality of optical communication devices.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and the written program can be stored in a medium.

The media may be stored such as magnetic storage media (e.g., ROM, floppy disk, hard disk, etc.), optical reading media (e.g., CD-ROM, DVD, etc.) and carrier waves (e.g., transmission over the Internet). The medium may include, but is not limited to.

Although embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may realize that the present invention may be embodied in other specific forms without changing the technical spirit or essential features thereof. I can understand. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

200: EPON system
210: fiber termination
212: switch control unit
214: switch subscriber unit
220: light switch
230: optical communication device
250: optical multiplexing device
270: subscriber device
290: management server

Claims (6)

An optical fiber terminator connecting the backbone network and the subscriber network to each other and terminating an optical signal;
An optical switch connected to the optical path terminator in a single optical path;
A plurality of optical communication devices connected to the optical switch for receiving an optical signal from the optical fiber terminator through the optical switch and providing a PON subscriber interface;
A plurality of optical multiplexing devices connected to each of the plurality of optical communication devices one-to-one to receive an optical signal transmitted from a corresponding optical communication device, and branch the received optical signal to transfer the received optical signal to a plurality of subscriber devices; And
A management server connected to the plurality of optical communication devices to remotely manage each of the plurality of optical communication devices,
The optical fiber terminal device is located in the national company, the optical switch is located in the main wiring cabinet or the communication box spaced apart from the domestic company,
When the management server and the plurality of optical communication devices are connected through an IP (internet protocol) network, each of the plurality of optical communication devices converts an IP packet received from the management server into an Ethernet packet and converts the converted Ethernet packet. An Ethernet Passive Optical Network (EPON) system, characterized in that for transmitting to the subscriber device through the optical multiplexing device. The method of claim 1,
Each of the plurality of optical communication devices generates a response packet as a response to a control packet from the management server and transmits the response packet to the management server. The method of claim 1,
The optical fiber termination device,
A switch subscriber unit providing a switch interface with downlink equipment; And
And a switch controller for routing the optical signal connected through the switching at the switch subscriber unit. The method of claim 1,
The optical fiber termination device,
EPON system further comprises a switch network for providing an interface for connection with upstream equipment. The method of claim 1,
The management server transmits a control packet to each of the plurality of optical communication devices,
Each of the plurality of optical communication devices transmits a control packet received from the management server to the subscriber device through the optical multiplexing device,
The control packet may include a control packet for topology management between each of the plurality of optical communication devices and the plurality of subscriber devices, a control packet for bandwidth allocation of each of the plurality of optical communication devices, and each of the plurality of optical communication devices. A control packet for setting protocols for the plurality of subscriber devices, a control packet for checking traffic statistics of each of the plurality of subscriber devices, and a control for diagnosing a communication state between each of the plurality of optical communication devices and the plurality of subscriber devices. At least one of a packet and a control packet for software upgrade of each of the plurality of optical communication devices and the plurality of subscriber devices. The method of claim 1,
The management server is a plurality,
The EPON system,
And a control server configured to determine the number of optical communication devices to be remotely managed by each of the plurality of management servers among the plurality of optical communication devices, based on a load degree of each of the plurality of management servers.

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