KR20180006991A - Ethernet passive optical network system and optical communication apparatus of passive optical network - Google Patents

Abstract

According to an embodiment of the present invention, disclosed is an Ethernet passive optical network (EPON) system which comprises: an optical line terminal apparatus for interconnecting a backbone network and a subscriber network, and terminating an optical signal; an optical switch connected to the optical line terminal apparatus through an optical line; an optical communication apparatus connected to the optical switch, and receiving the optical signal from the optical line terminal apparatus; an optical multiplexing apparatus receiving the optical signal from the optical communication apparatus, and diverging the received optical signal, and transferring the received optical signal to a plurality of subscriber apparatuses; and a management server for remotely managing the optical communication apparatus.

Description

[0001] The present invention relates to an EPON system and an optical communication apparatus based on a PON (hereinafter, referred to as " PON system &

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

As the Internet traffic continues to grow rapidly and the wired / wireless integrated network becomes visible, the development of optical subscriber technology represented by fiber-to-the-home (FTTH) is accelerating. PON (Passive Optical Network) technology, which is leading the FTTH market, is a point-to-multipoint optical subscriber technology that uses a passive branching device that does not require power supply as a remote node (RN).

PON technology not only provides high bandwidth to subscribers but also uses OSP (Outside Plant) because it is composed of passive devices, which can greatly reduce network operation cost.

PON technology is classified into two types according to difference of multiplexing and multiple access schemes. First, time division multiplexing-based TDM (Time Division Multiplexing) -PON is used. The second is wavelength division multiplexing based WDM (Wavelength Division Multiplexing) -PON. Here, the TDM-PON includes a B-PON (Broadband PON), a G-PON (Gigabit-capable PON) standardized by ITU-T, and an 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 requirement and have completed related standard.

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

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

In addition, the EPON system and the PON-based optical communication apparatus according to an embodiment of the present invention aim at efficiently managing a plurality of optical communication devices.

An EPON system according to an embodiment of the present invention includes:

An optical line termination device connecting the backbone network to the subscriber network and terminating optical signals; An optical switch connected to the optical line terminal by an optical line; An optical communication device connected to the optical switch for receiving an optical signal from the optical line terminating device; An optical multiplexer for receiving an optical signal from the optical communication device, for branching the received optical signal and transmitting the branched optical signal to a plurality of subscriber devices; And a management server for remotely managing the optical communication device.

The optical line terminating apparatus includes: a switch subscriber unit for providing a switch interface with downlink equipment; And a switch controller for performing routing of an optical signal to be connected through switching at the switch subscriber unit.

The optical line terminating device is located in the national office, 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 IP (Internet Protocol) network.

The optical communication device converts the received IP packet into an Ethernet packet and transmits the converted Ethernet packet to the optical multiplexer. When the Ethernet packet is received from the optical multiplexer, the optical communication device converts the received Ethernet packet into an IP packet Packet to the management server.

The IP packet received from the management server is a control packet for the plurality of subscriber devices, and the Ethernet packet received from the optical multiplexer may be a response packet of the plurality of subscriber devices.

The management server includes 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, a protocol setting for the optical communication device and the plurality of subscriber devices, A control packet for checking the traffic statistics of each of the plurality of subscriber devices, a control packet for diagnosing a communication state between the optical communication device and the plurality of subscriber devices, a control packet for checking the communication statistics between the optical communication device and the plurality of subscriber devices And transmit at least one of control packets for software upgrade to the optical communication device.

The optical communication device and the optical multiplexing device may be plurally arranged, and the optical multiplexing device may be arranged to correspond to each of the plurality of optical communication devices.

The EPON system can 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 the degree of load of each of the plurality of management servers .

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

According to another aspect of the present invention, there is provided an optical communication apparatus comprising:

And an optical line terminating device for connecting the backbone network and the subscriber network, and an optical switch connected to the optical line. When the optical signal is received from the optical line terminating device, the received optical signal is transmitted to the optical multiplexing device, So that an optical signal that branches due to the optical signal can be transmitted to a plurality of subscriber units.

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

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

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

ii) FTTH networks can be constructed at low cost.

iii) Multiple optical communication devices can be efficiently managed.

However, the effects that the EPON system and the PON-based optical communication device according to the embodiment of the present invention can achieve are not limited to those mentioned above, and other effects not mentioned can be obtained from the following description. And will be apparent to one of ordinary skill in the art.

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

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the intention is not to limit the invention to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

In addition, components referred to in this specification as 'units', 'modules', and the like refer to hardware components such as software, FPGA, or ASIC, and these components perform certain roles. However, the components are not limited to software or hardware. The component may be configured to reside on an addressable storage medium. Further, two or more components may be merged into one component, or one component may be divided into two or more functions according to a more refined function. In addition, each of the components to be described below may additionally perform some or all of the functions of the other components in addition to the main functions of the component itself, and some of the main functions And may be performed entirely by components.

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

1 is a diagram showing a typical EPON system.

1, a general EPON system includes an Optical Line Terminal (OLT) 10, a Main Distribution Frame (MDF) or a communication box (BBx, Broadcast Cabinet, An optical multiplexer 20 and a plurality of ONTs (Optical Network Terminals or ONUs) 30 located in a Broadcast Cast Shelter (BBS).

The optical line terminating device 10 serves to terminate the optical signal within the national history. As shown in Fig. 1, the optical line terminator 10 includes a plurality of PON subscriber units 11. As shown in Fig. Each of the plurality of PON subscriber units 11 may provide a PON subscriber interface and performs a connection with the subscriber unit 30, which is a downlink equipment.

Each of the PON subscriber units 11 is connected to the optical multiplexing apparatus 20 and the optical multiplexing apparatus 20 is connected to the plurality of subscriber apparatuses 30. Each subscriber device 30 can utilize the optical service through the optical signal received from the optical line terminating device 10 via the optical multiplexer 20. [

At present, an access network using a high-capacity optical line terminating device 10 capable of supporting a 10 Gbps transmission speed has been proposed according to the evolution of the network structure and the like. In order to accommodate the capacity of the large-capacity optical line terminating device 10, The facility is being built mainly. Here, when a large-capacity optical line terminal 10 is installed in a wide-area national office, there may be a further demand for a long-distance optical core extending to each main distribution board or communication box. That is, in the case of using the scheme shown in FIG. 1, there may arise a problem that an excessive amount of optical cores should be newly installed.

In order to solve this problem, it is possible to consider arranging the large-capacity optical line termination device 10 forward, but excessive investment cost may be a problem considering the cost compared with the capacity. That is, the large-capacity optical line terminal 10 can accommodate up to 5000 subscribers. However, since the proper capacity is about 500 subscribers in the case of forward placement, the cost required for the forward placement of the large-capacity optical line terminal 10 The effect that can be obtained can be insufficient.

2 is a diagram illustrating an EPON system 200 in accordance with one embodiment of the present invention.

2, an EPON system 200 according to an exemplary embodiment of the present invention includes an optical line terminator 210, an optical switch 220, a plurality of optical communication devices 230, a plurality of optical multiplexers 250, A plurality of subscriber devices 270, and a management server 290.

The optical line terminal 210 connects the backbone network and the subscriber network and terminates the optical signal. The optical line termination device 210 may include a switch control unit 212 and a switch subscriber unit 214. The optical line terminating device 210 is located within the national flag.

The switch control unit 212 manages the operation of the switch subscriber unit 214 and can designate routing and security of each optical signal connected through switching in the switch subscriber unit 214. [ The switch subscriber unit 214 provides a switch interface with downstream equipment.

Although not shown in the drawing, the optical line terminating device 210 may further include a switch network unit for providing an interface for connection with uplink equipment.

The optical switch 220 is an aggregation purpose switch that distributes an optical signal transmitted from the optical line terminating device 210 to each of the plurality of optical communication devices 230 or transmits optical signals transmitted from the plurality of optical communication devices 230 And transmits it to the optical line termination device 210. The optical switch 220 and the optical line terminating device 210 may be connected by one optical line. Although the optical switch 220 is shown in FIG. 2 as being disposed in the main distribution box or the communication box, the optical switch 220 may be disposed outside the main distribution box or communication box.

The optical communication device 230 is connected to the optical switch 220 to provide a PON subscriber interface and can perform the connection with the subscriber device 270 as a downstream device in a 1: N ratio. The optical communication device 230 may be implemented as a stick type or a card type and may be connected to the optical switch 220.

The optical communication device 230 can perform the same function as the PON subscriber unit 11 of FIG. In other words, in the EPON system 200 according to the embodiment of the present invention, the conventional PON subscriber unit 11 is removed from the optical line termination unit 210, and the optical communication apparatus 100, in which the function of the PON subscriber unit 11 is implemented, (230) is located outside of the optical line terminator (210), for example, in a main distribution box or a communication box. The number of optical cores is reduced compared to the EPON system 200 shown in FIG. 1 by arranging the optical communication device 230 in advance and connecting the optical line terminal device 210 to the optical switch 220 with a large-bandwidth optical line .

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

The management server 290 manages the optical communication device 230 remotely. Specifically, the management server 290 performs setting, management, and diagnosis of the optical communication device 230 and the subscriber device 270 based on the cloud. The optical line terminal 210 and the optical communication device 230 are connected to each other via Ethernet while the management server 290 is connected to the optical communication device 230 through an IP network.

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

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

When the optical line terminal 210 and the optical communication device 230 are connected to each other via Ethernet and the management server 290 and the optical communication device 230 are connected to each other through an IP protocol network, the management server 290, 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, the control IP packet and the response IP packet refer to a control packet and response packet transmitted and received in the IP network, and the control Ethernet packet and the response Ethernet packet refer to a control packet and a 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 the optical communication device 230 has information to be answered, the optical communication device 230 transmits the information to the management server 290 in the response IP packet. (3) The optical communication device 230 converts the control IP packet into a control Ethernet packet, and (4) transmits the control Ethernet packet to the subscriber device 270 through the optical multiplexer 250. (5) The subscriber unit 270 includes information to be answered by the subscriber unit 270 in the response Ethernet packet, and transmits the response Ethernet packet to the optical communication device 230 through the optical multiplexer 250. (6) 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 can collect the load degree of each of the plurality of management servers 290 and adjust the number of the optical communication devices 230 to be managed by the respective management servers 290 based on the collected load degree. The control server can collect at least one of the number of optical communication devices 230, the degree of CPU usage, and the memory occupancy rate, which are managed by each of the management servers 290, 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 manages one optical communication device 230 at present, When the degree of load of the server 290 is larger than the load of the second management server 290, the control server allows the first management server 290 to manage one optical communication device 230, 290 can manage the three optical communication devices 230. The control server may provide a web-based management UI (user interface) 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 can share the degree of load with each other, and can adjust the number of the optical communication devices 230 to be managed by each management server 290 in collaboration.

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

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

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

The optical communication device 230 according to an embodiment of the present invention may be implemented as a stick type as shown in Fig. 5 (a), or may be implemented as a card type Lt; / RTI > The stick type or card type optical communication device 230 can be mounted on an L2 (layer 2) switch or the like.

The EPON system and the PON-based optical communication apparatus 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 apparatus according to an embodiment of the present invention can efficiently manage a plurality of optical communication devices.

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

The medium may be a storage such as a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g. CD ROM, DVD, etc.) and a carrier wave Media, but is not limited thereto.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

200: EPON system
210: Optical line terminator
212:
214: Switch subscriber unit
220: Optical switch
230: Optical communication device
250: Optical multiplexing device
270: Subscriber unit
290: management server

Claims (6)

An optical line termination device connecting the backbone network to the subscriber network and terminating optical signals;
An optical switch connected to the optical line termination device through one optical line;
A plurality of optical communication devices connected to the optical switches for receiving optical signals from the optical line terminators through the optical switches;
A plurality of optical multiplexers connected to each of the plurality of optical communication devices, for receiving optical signals transmitted from corresponding optical communication devices, for branching the received optical signals and transmitting the branched optical signals to a plurality of subscriber devices; And
And a management server for remotely managing each of the plurality of optical communication devices,
Wherein the optical line terminator is located within an interior of the branch office, the optical switch is located in a main distribution box or a communication box which is spaced apart from the national office,
Wherein each of the plurality of optical communication devices converts an IP packet received from the management server into an Ethernet packet when the management server and the plurality of optical communication devices are connected through an internet protocol (IP) network, Passive Optical Network) system. The method according to claim 1,
Wherein each of the plurality of optical communication apparatuses generates a response packet as a response to the control packet from the management server and transmits the response packet to the management server. The method according to claim 1,
The optical line terminating device includes:
A switch subscriber unit providing a switch interface with downlink equipment; And
And a switch controller for performing routing of an optical signal connected through switching at the switch subscriber unit. The method according to claim 1,
The optical line terminating device includes:
Further comprising a switch network unit for providing an interface for connection with uplink equipment. The method according to claim 1,
The management server includes:
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, a control packet for allocating a bandwidth for each of the plurality of optical communication devices, A control packet for confirming traffic statistics of each of the plurality of subscriber devices, a control packet for diagnosing communication state between each of the plurality of optical communication devices and the plurality of subscriber devices, Wherein at least one of the optical communication apparatus and the control packet for software upgrade of the plurality of subscriber apparatuses is transmitted to each of the plurality of optical communication apparatuses. The method according to claim 1,
The management server includes a plurality of management servers,
The EPON system comprises:
Further comprising a control server for determining 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 the degree of load of each of the plurality of management servers.

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