KR102211854B1 - Apparatus for Passive Optical Networks and system having the same - Google Patents

Abstract

The present application relates to a PON-based optical communication device and an EPON system including the same, and the PON-based optical communication device according to an embodiment of the present invention includes an optical line terminal (OLT) of EPON (Ethernet Passive Optical Network) and , A PON-based optical communication device connected through an optical cable, comprising: a signal receiver configured to receive an optical signal from the optical path termination device; And a subscriber unit for controlling connection and maintenance to a plurality of optical network terminals (ONTs) according to a control signal included in the optical signal.

Description

PON-based optical communication device and EPON system including the same {Apparatus for Passive Optical Networks and system having the same}

The present application relates to a PON-based optical communication device and an EPON system including the same, and in particular, to a PON-based optical communication device capable of optimizing a national office and reducing the cost of building a line, and an EPON system including the same.

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

Accordingly, PON technology is spreading due to the advantage of not only being able to provide high bandwidth to subscribers, but also of greatly reducing the operating cost of the network since the OSP (Outside Plant) is composed of only passive devices.

PON technology is classified into two broad categories according to the difference in multiplexing and multiple access methods.The first is Time Division Multiplexing-based TDM (Time Division Multiplexing)-PON, and the second is Wavelength Division Multiplexing (WDM)-PON based on Wavelength Division Multiplexing. to be. At this time, 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 the bandwidth requirements of users, and ITU-T is XG-PON1 (10 Gigabit PON) connecting G-PON, and IEEE is The 10G-EPON standard connecting E-PON has been completed.

Korean Patent Application Publication 10-2012-0074964 (2012.07.06)

The present application is to provide a PON-based optical communication device capable of optimizing a national office and reducing the cost of building a line and an EPON system including the same.

A PON-based optical communication device according to an embodiment of the present invention relates to a PON-based optical communication device that is connected to an optical line terminal (OLT) of an EPON (Ethernet Passive Optical Network) system through an optical cable, and the optical path termination A signal receiver for receiving an optical signal transmitted from the device; And a PON subscriber unit for controlling connection and maintenance of a plurality of optical network terminals (ONTs) according to a control signal included in the optical signal.

Here, the PON-based optical communication device according to an embodiment of the present invention may be installed in a main distribution frame (MDF) or a communication box (BBx) in an area where a plurality of optical subscriber devices are located.

Here, the signal receiver includes a plurality of channels for distinguishing and transmitting the traffic of the optical signal, and may designate a service level agreement (SLA) according to each channel.

Here, the signal receiver may set a predetermined bandwidth and priority respectively set to the channel, and transmit optical signals differentiated according to the traffic through respective corresponding channels.

Here, the signal receiver may receive the optical signal from a first PON-based optical communication device connected to the optical path termination device in a ring structure.

Here, the PON-based optical communication device according to an embodiment of the present invention may further include a signal transmitter for transmitting the received optical signal to a second PON-based optical communication device connected in the ring structure.

Here, in the PON-based optical communication device according to an embodiment of the present invention, when the signal transmission unit is directly connected to the optical line termination device, the direct connection is designated as RPL (Ring Protection Link), and the loop formation of the optical signal is performed. Can be prevented.

Here, in the PON-based optical communication device according to an embodiment of the present invention, when a reception abnormality is detected in at least one of a CFM OAM reception state, an Ethernet OAM reception state, and an optical signal reception state, the occurrence of an abnormality may be notified to the optical path termination device. have.

Here, the PON-based optical communication device according to an embodiment of the present invention, when notifying the occurrence of an abnormality in the optical path termination device, replaces the functions of the signal transmitter and the signal receiver according to the control of the optical path termination device, The direction of signal transmission can be switched.

Here, in the PON-based optical communication device according to an embodiment of the present invention, when a reception abnormality is detected in at least one of the CFM OAM reception state, the Ethernet OAM reception state, and the optical signal reception state, the ring structure is The direction of signal transmission can be switched.

Here, the signal receiver may receive a control signal including an Operation and Maintenance (OAM) message.

Here, the OAM message is generated according to IEEE 802.3, clause 57, and may further include an item indicating the OAM protocol data unit in the Ethernet header area.

Herein, the OAM protocol data unit may be a structure in which a plurality of PON-based optical communication devices are interconnected by forming a ring structure with an optical path termination device, and the optical path termination device may be used to control each PON-based optical communication device.

Here, the OAM protocol data unit is "SourcePU ID#" including an identifier indicating a PON-based optical communication device that transmits the OAM message in the ring structure connection, and the number of PON-based optical communication devices that receive the OAM message. It may include "PU ID List count" indicating "Destination PU ID#" indicating an identifier list of the PON-based optical communication device receiving the OAM message.

Here, the subscriber unit is the same as the identifier of the PON-based optical communication device received by the "SourcePU ID#", or if the identifier of the received PON-based optical communication device is not included in the "Destination PU ID List", the received OAM You can drop the message.

Here, the OAM protocol data unit includes a "flag" indicating whether the OAM message is set for a PON-based optical communication device and an optical subscriber device, a "LLID List count" indicating the number of optical subscriber devices to receive, and receiving It may further include "Destination LLID" indicating a list of identifiers of optical subscribers.

The EPON system according to an embodiment of the present invention relates to an EPON (Ethernet Passive Optical Network) system, which is installed in a national office and connects optical signals transmitted and received from a subscriber network to a backbone network. (OLT: Optical Line Terminal); It is installed in a main distribution frame (MDF) in an area where a plurality of optical network terminals (ONTs) are located, and transmits and receives the optical signal to a plurality of optical subscriber devices under the control of the optical line termination device. PON-based optical communication device; And an optical cable connecting the optical path termination device and the PON-based optical communication device.

In addition, the solution to the above-described problem does not enumerate all the features of the present invention. Various features of the present invention and advantages and effects thereof may be understood in more detail with reference to the following specific embodiments.

According to the PON-based optical communication device and the EPON system including the same according to an embodiment of the present invention, it is possible to optimize the office and reduce the cost of building a line.

According to the PON-based optical communication device and the EPON system including the same according to an embodiment of the present invention, in an access network using a large-capacity optical line termination device capable of supporting 10 Gbps transmission rate, optical communication efficiently by optimizing the redundant wide area office facilities A network can be formed, and FTTH coverage of 70 km or more can be secured.

According to the PON-based optical communication device and the EPON system including the same according to an embodiment of the present invention, it is possible to reduce the optical core that may occur when installing a wide area office.

1 is a block diagram showing an EPON system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional EPON system.
3 is a schematic diagram showing a connection form of a ring structure of an EPON system according to an embodiment of the present invention.
4 is a flow chart showing a method for detecting a line abnormality in an EPON system according to an embodiment of the present invention.
5 and 6 are tables showing the OAM structure of a PON-based optical communication device according to an embodiment of the present invention.
7 and 8 are tables showing the OAM structure during operation control for an optical subscriber device in a PON-based optical communication device according to an embodiment of the present invention.
9 is a table showing operation control for an optical subscriber device of a PON-based optical communication device according to an embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for portions having similar functions and functions.

In addition, throughout the specification, when a part is said to be'connected' to another part, it is not only'directly connected', but also'indirectly connected' with another element in the middle. Include. In addition, "including" a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

1 is a block diagram showing an EPON system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional EPON system.

Referring to FIG. 1, an EPON system according to an embodiment of the present invention may include an optical path termination device 100, a PON-based optical communication device 200, and an optical cable 300.

Hereinafter, an EPON system according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Conventionally, as shown in Fig. 2, when an optical line terminal (OLT) located at a national office transmits an optical signal through an optical cable, the splitter s diverges the optical signal to a plurality of Of optical subscriber devices (ONT: Optical Network Terminal or ONU: Optical Network Unit, 400). The splitter (s) is a main distribution frame (MDF) or communication box (BBx, ex. BBC: Broad Cast Cabinet, BBS: Broad Cast Shelter, BBH) in an area where a plurality of optical subscriber devices 400 are densely located. : It is installed in Broad Cast House), etc., and can be connected between the splitter (s) and the optical path termination device 10 by an optical cable. That is, by the splitter s, it is possible for a plurality of optical subscriber devices 400 to share one optical cable.

Here, the conventional optical fiber termination device 10 may include a switch control unit 11, a switch subscriber unit 12, a PON control unit 13, and a PON subscriber unit 14, as shown in FIG. 2. . The optical path termination device 10 performs a function of connecting a subscriber network and a back-bone network to each other, and terminates an optical signal so that each optical signal can be transmitted to the corresponding optical subscriber device 400. You can play a role.

Specifically, the switch control unit 11 performs operation and management of the switch subscriber unit 12, and performs path designation and security setting of each optical signal connected through switching in the switch subscriber unit 12. I can. Here, the switch subscriber unit 12 provides a switch interface for connection to a downstream device, and although not illustrated, a switch network unit providing an interface for connection with an upstream device may be further included.

The PON control unit 13 operates and manages the PON function, and can control the operation of the PON subscriber unit 14. Here, the PON subscriber unit 14 may provide a PON subscriber interface, and may perform connection with the optical subscriber device 400, which is a downstream device.

However, nowadays, according to the evolution of the network structure, an access network using a large-capacity fiber optic end device capable of supporting 10 Gbps transmission speed is being proposed, and facilities are built around a large-scale government office to suit the capacity of a large-capacity fiber optic end device. Has become. Here, when a large-capacity optical path termination device is installed in a national office in a wide area, demand for a long-distance optical core extending to each main distribution board or communication box may additionally occur. That is, when the conventional method as shown in FIG. 2 is used, a problem such as having to newly install an excessive amount of optical cables may occur.

On the other hand, in order to solve this problem, a method of arranging a large-capacity optical fiber end device forward may be considered, but excessive investment cost may be a problem when considering the cost compared to capacity. In other words, in the case of a large-capacity optical line termination device, up to 5000 subscribers can be accommodated, but in the case of forward arrangement, the appropriate scale of acceptance is around 500 subscribers. May be insufficient.

In order to solve the above-described problems and the like, in one embodiment of the present invention, a method of forward-arranging some of the functions of the optical path termination device 10 to the main distribution board or communication box is proposed.

That is, as shown in Fig. 1, in the EPON system according to an embodiment of the present invention, the function of the PON subscriber unit 14 is performed by the PON-based optical communication device 200 provided in the main distribution panel or communication box. can do. In this case, when the optical path termination device 100 transmits an optical signal, the PON-based optical communication device 200 arranged forward may perform the function of the PON subscriber unit 14, and the optical path termination device 100 According to the control of, each optical subscriber device 400 to which an optical signal is to be transmitted can be distinguished. Thereafter, each of the discriminated optical signals may be branched through a plurality of splitters s and transmitted to a corresponding optical subscriber device 400. In particular, since optical communication at a speed of 10 Gbps is supported between the optical path termination device 100 and the PON-based optical communication device 200, it is possible for the PON-based optical communication device 200 to transmit an optical signal to a plurality of splitters (s). . Here, the optical path termination device 100 and the PON-based optical communication device 200 may be connected to an access network supporting a 10 Gbps transmission rate, and an optical cable connecting the optical path termination device 100 and the PON-based optical communication device 200 ( 300) may support a transmission rate of 10 Gbps. However, the transmission rate of the EPON system according to an embodiment of the present invention is not limited to 10 Gbps, and various transmission rates including 2.5 Gbps, 40 Gbps, and 100 Gbps may be supported according to the embodiment.

Here, the PON-based optical communication device 200 according to an embodiment of the present invention may include a signal receiving unit 210 and a PON subscriber unit 220 as shown in FIG. 1. The PON-based optical communication device 200 may be controlled from the optical path termination device 100 through Ethernet, and transmit the optical signals to a plurality of optical subscriber devices 400 under the control of the optical path termination device 100. You can send and receive.

Specifically, the signal receiver 210 may receive an optical signal transmitted from the optical path termination device 100 at a speed of 10 Gbps. In this case, the signal receiver 210 may include a plurality of channels for receiving the optical signal, and the channels may include a control channel for receiving a control signal and a data channel for receiving a data signal. In addition, the channels may be classified and operated for each traffic of optical signals, and a service level agreement (SLA) may be designated according to each channel. Accordingly, the signal receiver 210 may set a preset designated bandwidth and priority for each channel, and transmit optical signals differentiated according to the traffic through respective corresponding channels. For example, after the priority is classified into high, medium, and low, traffic of each optical signal may be transmitted through channels having different bandwidths according to the priority.

Meanwhile, according to an embodiment, as shown in FIG. 3, a plurality of PON optical communication devices 200a, 200b, and 200c are connected to the optical path termination device 100 in a ring structure to form a 10G EPON system. That is, the signal receiving unit 210 is directly connected to the optical path terminating device 100 and instead of receiving an optical signal, another PON-based optical communication device connected in the ring structure, for example, a first PON-based optical communication device ( The optical signal may be received from 200a).

In addition, the PON optical communication device 200b receiving the optical signal from the first PON-based optical communication device 200a transmits the received optical signal to the neighboring second PON-based optical communication device 200c connected in the ring structure. can do. In this case, the PON-based optical communication device 200b may further include a configuration of a signal transmission unit 230 for transmitting the optical signal. Here, the plurality of PON optical communication devices 200a, 200b, and 200c connected in the ring structure may include a plurality of optical subscriber terminal devices 400 connected to each other. In this case, when the optical signal is transmitted to the neighboring PON optical communication devices 200a, 200b, 200c, each of the PON optical communication devices 200a, 200b, 200c It is possible to check whether an optical signal is included.

On the other hand, when the signal transmission unit 230 is directly connected to the optical path terminating device 100, the direct connection line may be designated as a Ring Protection Link (RPL), thereby preventing the formation of a loop of the optical signal. That is, the optical path termination device 100 may block an optical signal input through the RPL. Instead, since the optical path terminating device 100 and the PON optical communication devices 200a, 200b, and 200c form a ring structure, it is possible to switch to the opposite connection line if an abnormality occurs in any one connection line. That is, in the case of transmitting and receiving an optical signal in the form of the ring structure, when it is determined that a problem has occurred in the connection, the signal receiving unit 210 and the signal transmitting unit 230 reverse their respective functions. By making it operate, it can be prepared for line abnormalities and the like.

Specifically, as shown in FIG. 4, whether or not the line is abnormal is a condition of receiving a connection of a ring structure (S10), and then a connectivity fault management (CFM) operation, administration, maintenance (OAM) message, It can be determined by checking the Ethernet OAM reception status and optical signal reception status (S21, S22, S23). That is, when a reception abnormality is detected in at least one of a reception state of a CFM OAM message, an Ethernet OAM reception state, and an optical signal reception state, it may be determined that an abnormality has occurred in the optical path (S31, S32, S33). Here, when the reception abnormality is detected, the line may be switched in the opposite direction by switching the connection ports (a, b) of the optical path terminating device 100 (S40). However, in order to prevent the connection ports (a, b) from being continuously switched according to the detection result of each abnormality detection means, after a preset time (for example, 5 seconds) has elapsed, the ring It is possible to restrict the switching of the signal transmission direction of the structure (S40).

Meanwhile, the signal receiving unit 210 according to an embodiment of the present invention may receive a control signal including an OAM (Operation, Administration, Maintenance) message. Here, the signal receiving unit 210 may prevent the OAM from being omitted during transmission/reception by ensuring a separate bandwidth and high priority for the OAM message when receiving the OAM message. The OAM message may be generated according to IEEE 802.3, clause 57, and may be modified to further include an item indicating "OAM protocol data unit" in the Ethernet header area as shown in FIG. 5. Here, the "OAM protocol data unit" is a structure in which a plurality of PON-based optical communication devices 200a, 200b, 200c are interconnected by forming a ring structure with the optical path termination device 100, and the optical path termination device 100 It may be used to control each PON-based optical communication device (200a, 200b, 200c).

Specifically, the "OAM protocol data unit" may include a plurality of fields as shown in FIG. 6. That is, in the connection of the ring structure, "SourcePU ID#" including an identifier indicating the PON-based optical communication devices 200a, 200b, 200c transmitting the OAM message, a PON-based optical communication device receiving the OAM message ( 200a, 200b, 200c) "PU ID List count" indicating the number of), "Destination PU ID#" indicating the identifier list of the PON-based optical communication devices 200a, 200b, 200c receiving the OAM message, etc. Can be included.

Here, the PON subscriber unit 220 controls connection and maintenance of a plurality of optical subscriber devices 400 according to a control signal included in the optical signal, wherein the PON subscriber unit 220 comprises: The identifier of the PON-based optical communication device (200a, 200b, 200c) received by "SourcePU ID#" is the same, or the identifier of the PON-based optical communication device (200a, 200b, 200c) received is in the "Destination PU ID List" If not included, the received OAM message may be dropped. Here, when the "SourcePU ID#" is the same as the identifier of the received PON-based optical communication device (200a, 200b, 200c), the sender and receiver of the OAM message match, in order to prevent loop formation in the ring structure , It is possible to drop the OAM message. In addition, when the identifiers of the received PON-based optical communication devices 200a, 200b, and 200c are not included in the "Destination PU ID List", they may be dropped for processing the OAM message without delay. In this case, it is possible to increase the transmission efficiency of the OAM message.

On the other hand, the optical path termination device 100 may perform setting or control for the optical subscriber device 400 in addition to the PON-based optical communication device 200 by using the above-described OAM message. That is, the OAM protocol data unit may include a "flag" indicating which of the PON-based optical communication device 200 and the optical subscriber device 400 is set, and to receive the OAM message. A "LLID List count" representing the number of optical subscriber devices 400 and "Destination LLID" representing an identifier list of the optical subscriber devices 400 to be received may be further included.

Additionally, detailed operation control of the optical subscriber device 400 of the PON-based optical communication device 200 using the above-described OAM message will be described with reference to FIGS. 7 and 8. Specifically, there may be a case where the optical path termination device 100 requests the optical subscriber device 400 to confirm a specific value set in the optical subscriber device 400. For example, the optical line termination device 100 may request an inquiry about the "Media Access Channel (MAC) Limit" or "MAC Entry" of the optical subscriber device 400. In this case, the PON subscriber unit 220 may request the inquiry from each optical subscriber device 400 by using the OAM message received from the optical path termination device 100.

That is, the optical line termination device 100 may input an opcode indicating an inquiry for a specific value in the Ethernet header area of the OAM message, for example, Ox02, and the optical subscriber device having the specific value in the OAM protocol data unit area ( 400) can be entered. For example, a PON-based optical communication device 200 to which the optical subscriber device 400 having a specific value is connected, and an optical subscriber such as a branch and a leaf connected from the PON-based optical communication device 200 Information on the location of the device 400 may be displayed.

In addition, as shown in FIG. 8, in response to the inquiry request for the specific value, the PON subscriber unit 220 collects the specific values collected from a plurality of optical subscriber devices 400 and sends an OAM message to the optical path. It can be transmitted to the termination device 100. In this case, the PON subscriber unit 220 may input an opcode indicating a response to the specific value, for example, Ox03, and the specific value and the width of the specific value are in the OAM protocol data unit area. In addition to ), information on locations such as a branch and a leaf of the optical subscriber device 400 having the specific value may be included. Accordingly, the optical line terminating device 100 receiving the OAM message can inquire a specific value of the desired optical subscriber device 400.

In addition, the optical line termination device 100 may perform operation control such as inquiries and settings for various values on the optical subscriber device 400, as shown in FIG. 9.

The present invention is not limited by the above-described embodiments and the accompanying drawings. It will be apparent to those of ordinary skill in the art to which the present invention pertains, that components according to the present invention can be substituted, modified, and changed within the scope of the technical spirit of the present invention.

10, 100: optical path termination device 11, 110: switch control unit
12, 120: switch subscriber unit 13, 130: PON control unit
14: PON subscriber section
200, 200a, 200b, 200c: PON-based optical communication device 210: Signal receiver
220: PON subscriber unit 300: optical cable
400: optical subscriber device
S: splitter

Claims (17)

There is a PON-based optical communication device connected to an optical line terminal (OLT) of an EPON (Ethernet Passive Optical Network) through an optical cable,
A signal receiver for receiving an optical signal transmitted through the optical cable from the optical path termination device; And
In accordance with the control signal included in the optical signal, comprising a PON subscriber unit for controlling the connection and maintenance of a plurality of optical subscriber devices (ONT: Optical Network Terminal),
The PON-based optical communication device,
Compared to the optical path termination device, it is arranged forward toward the plurality of optical subscriber devices, and is connected to the optical path termination device through the optical cable,
The PON subscriber unit,
Transmitting the optical signal to the plurality of optical subscriber devices under the control of the optical path termination device,
According to the control of the optical path terminating device, to distinguish the optical subscriber device to transmit the optical signal
PON-based optical communication device. The method of claim 1,
The PON-based optical communication device,
A PON-based optical communication device, characterized in that it is installed in a main distribution frame (MDF) or a communication box (BBx) in an area where a plurality of optical subscriber devices are located. The method of claim 1,
The signal receiving unit,
Includes a plurality of channels for receiving the optical signal,
Each of the plurality of channels is designated with a service level agreement (SLA),
The optical signal is differentiated according to the traffic of the optical signal and passes through a corresponding channel.
PON-based optical communication device. The method of claim 3,
In the plurality of channels, different bandwidths and priorities are set
PON-based optical communication device. The method of claim 1, wherein the signal receiver
A PON-based optical communication device receiving the optical signal from a first PON-based optical communication device connected to the optical path termination device in a ring structure.
The method of claim 5,
PON-based optical communication device further comprising a signal transmission unit for transmitting the received optical signal to the second PON-based optical communication device connected in the ring structure.
The method of claim 6,
When the signal transmission unit is directly connected to the optical line terminating device, the PON-based optical communication device prevents the formation of a loop of the optical signal by designating the directly connected connection as a Ring Protection Link (RPL).
The method of claim 1,
When a reception error is detected in at least one of a CFM (connectivity fault management) OAM (operation, administration, maintenance) message reception state, an Ethernet OAM message reception state, and an optical signal reception state, PON-based optical communication notifies the occurrence of an error to the optical line termination device Device.
The method of claim 8,
When notifying the occurrence of an abnormality to the optical path termination device, the PON-based optical communication device switches the signal transmission direction of the ring structure by replacing the functions of the signal transmitting unit and the signal receiving unit according to the control of the optical path terminating device. The method of claim 9,
When a reception error is detected in at least one of the CFM OAM message reception state, the Ethernet OAM message reception state, and the optical signal reception state, the PON-based optical communication device switches the signal transmission direction of the ring structure after a preset time elapses. The method of claim 1, wherein the signal receiver
PON-based optical communication device that receives control signals including OAM (Operation, Administration, Maintenance) messages.
The method of claim 11, wherein the OAM message,
A PON-based optical communication device that is generated according to IEEE 802.3, clause 57, and further includes an item indicating an OAM protocol data unit in the Ethernet header area.
The method of claim 12, wherein the OAM protocol data unit
In a structure in which a plurality of PON-based optical communication devices are interconnected by forming a ring structure with the optical path termination device, the optical path termination device is used to control each PON-based optical communication device.
The method of claim 13, wherein the OAM protocol data unit
In the ring structure connection, "SourcePU ID#" including an identifier indicating a PON-based optical communication device that transmits the OAM message, and "PU ID List count" indicating the number of PON-based optical communication devices that receive the OAM message. , PON-based optical communication device comprising "Destination PU ID#" indicating an identifier list of the PON-based optical communication device receiving the OAM message.
The method of claim 14, wherein the subscriber unit
If the "SourcePU ID#" is the same as the identifier of the PON-based optical communication device received, or the identifier of the PON-based optical communication device received is not included in the "Destination PU ID List", the received OAM message is dropped. ) A PON-based optical communication device.
The method of claim 14, wherein the OAM protocol data unit
"Flag" indicating whether the OAM message is set for a PON-based optical communication device or an optical subscriber device, a "LLID List count" indicating the number of optical subscriber devices to receive, and a "LLID List count" indicating an identifier list of a receiving optical subscriber. PON-based optical communication device further including "Destination LLID".
In the EPON (Ethernet Passive Optical Network) system,
An optical line terminal (OLT) installed at a national office and connecting optical signals transmitted and received from a subscriber network to a backbone network;
An optical cable connected to the optical path termination device; And
A PON-based optical communication device installed in a main distribution frame (MDF) in an area where a plurality of optical subscriber devices (ONTs) are located, and receiving the optical signal from the optical line termination device through the optical cable; Including,
The PON-based optical communication device,
It is arranged forward toward the plurality of optical subscriber devices compared to the optical path termination device, and is connected to the optical path termination device through the optical cable,
Transmitting the optical signal to the plurality of optical subscriber devices under the control of the optical path termination device,
According to the control of the optical path terminating device, to distinguish an optical subscriber device to transmit the optical signal
EPON system.

Images