WO2014097665A1

WO2014097665A1 - Master station, controller, slave station, optical communication system and failure monitoring method

Info

Publication number: WO2014097665A1
Application number: PCT/JP2013/065062
Authority: WO
Inventors: 隆司菊澤; 竜介川手; 向井　宏明
Original assignee: 三菱電機株式会社
Priority date: 2012-12-21
Filing date: 2013-05-30
Publication date: 2014-06-26
Also published as: WO2014097491A1

Abstract

An optical line terminal (OLT) (20), which is connected to a higher-level network, is provided with: a passive optical network (PON) control unit (110) that acquires information indicating the state of an optical network unit (ONU) on the basis of a PON protocol; an ONU state management unit (111) that acquires the information indicating the state of the ONU from the PON control unit (110), and retains said information as state information; an Ethernet Operations, Administration, and Maintenance (EOAM) processing unit (113) that communicates with the higher-level network on the basis of EOAM; and a protocol conversion unit (112) that sets, for the EOAM processing unit (113), an alternate point, which responds in an equivalent manner to the case in which a monitoring point has been set in EOAM in the ONU on the basis of the state information.

Description

Master station device, control device, slave station device, optical communication system, and fault monitoring method

The present invention relates to a master station device, a control device, a slave station device, an optical communication system, and a failure monitoring method.

As one of the layer 2 network monitoring protocols, IEEE (Institut of Electrical and Electronic Engineers) 802.1ag or Y. There is Ethernet (registered trademark) OAM (Operation Administration and Maintenance) standardized in 1731. GE-PON (Gigabit Ethernet (registered trademark)-Passive Optical Network) and G-PON (Gigabit PON) and other PON systems are monitored by applying Ethernet (registered trademark) OAM (hereinafter abbreviated as EOAM). In this case, the OLT (Optical Line Terminal) that operates as a master station device and the ONU (Optical Network Unit) that operates as a slave station device need to be equipped with a function for performing protocol processing. For example, a method for supporting EOAM by realizing such protocol processing with S / W (SoftWare) installed in the ONU has also been proposed (see, for example, Patent Document 1).

On the other hand, in each PON system, the state of the ONU is managed by a protocol corresponding to the EOAM or PON system, and the conduction state to the user interface is monitored by the OLT.

Special table 2010-527205 gazette

In the conventional PON system, in order to apply EOAM to the ONU, the IEEE 802.1ag or Y. 1731 functions need to be implemented. For this reason, IEEE 802.1ag or Y.I. There is a problem that ONUs not supporting EOAM that do not have the 1731 function cannot be monitored by the EOAM protocol.

The present invention has been made in view of the above, and it is possible to manage from the network side to the slave station device by the EOAM without changing the slave station device (ONU) or with a small change amount. An object is to obtain a station apparatus, a control apparatus, a slave station apparatus, an optical communication system, and a failure monitoring method.

In order to solve the above-mentioned problems and achieve the object, the present invention is connected to a slave station device through an optical communication path, communicates with the slave station device using a first protocol, and is connected to a host network. A first protocol control unit that obtains information indicating a status of the slave station device based on the first protocol, and indicates the status of the slave station device from the first protocol control unit A second protocol for acquiring information and holding communication between the state management unit for storing the state of each slave station device as state information and the upper network based on a second protocol different from the first protocol Based on the status information, the control unit sets a proxy point for performing a response equivalent to a case where a monitoring point in the second protocol is set in the slave station device. Characterized in that it comprises a protocol conversion unit that performed on le control unit.

A master station device, a control device, a slave station device, an optical communication system, and a failure monitoring method according to the present invention can be performed without changing the slave station device (ONU) or with a small change amount from the network side by the EOAM. There is an effect that even the device can be managed.

FIG. 1 is a diagram illustrating a configuration example of a communication system according to the first embodiment. FIG. 2 is a diagram illustrating a setting example of MEP and MIP in EOAM. FIG. 3 is a diagram illustrating an arrangement example of MEPs and MIPs according to the first embodiment. FIG. 4 is a diagram illustrating a configuration example of the OLT according to the first embodiment. FIG. 5 is a diagram illustrating a configuration example of the ONU according to the first embodiment. FIG. 6 is a flowchart illustrating an example of a failure monitoring procedure using the proxy monitoring point according to the first embodiment. FIG. 7 is a diagram illustrating a configuration example of a communication system according to the second embodiment. FIG. 8 is a diagram illustrating a configuration example of the OLT according to the fourth embodiment. FIG. 9 is a flowchart illustrating an example of a processing procedure of determination processing for determining whether or not to set a proxy monitoring point according to the fourth embodiment. FIG. 10 is a diagram illustrating a configuration example of a communication system when a proxy setting necessity determination unit is provided in a device external to the OLT.

Hereinafter, embodiments of a master station device, a control device, a slave station device, an optical communication system, and a fault monitoring method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a first embodiment of a communication system including a PON system (optical communication system) according to the present invention. As shown in FIG. 1, the communication system of the present embodiment includes a station side optical communication device (also referred to as “Optical Line Terminal”, hereinafter referred to as “OLT”) 20 that operates as a master station device, and a slave station device. A plurality of user-side optical communication devices (also referred to as “Optical Network Unit”, hereinafter referred to as “ONU”) 21-1 to 21-3, and Ethernet (registered trademark) switches arranged on the user side 10 and an Ethernet (registered trademark) switch 11 on the upper side (connected to the upper network). Although FIG. 1 shows an example with three ONUs, the number of ONUs is not limited to this.

The OLT 20 and the ONUs 21-1 to 21-3 are connected via an optical coupler 22 and an optical fiber to constitute a PON system. This PON system may be a GE-PON system based on IEEE 802.3ah. 983.1 G-PON system or the like may be used as long as the OLT can manage the states of the ONUs 21-1 to 21-3. The OLT 20 and the Ethernet

switches

10 and 11 include IEEE 802.1ag, Y. Ethernet (registered trademark) OAM (hereinafter abbreviated as “EOAM”) described in J. 1731. The Ethernet switches 10 and 11 may be gateways or routers.

The Ethernet switch 10 includes an I / F (interface) 12 that performs interface processing on the lower side and an I / F 13 that performs interface processing on the upper side. The ONU 21-1 includes an I / F 23 that performs lower-level interface processing and an I / F 24 that performs higher-level interface processing. The ONU 21-2 and ONU 21-3 may have the same configuration as the ONU 21-1, or may be different. The OLT 20 includes an I / F 25 that performs lower-level interface processing and an I / F 26 that performs higher-level interface processing. The Ethernet switch 11 includes an I / F (interface) 14 that performs interface processing on the lower side and an I / F 15 that performs interface processing on the upper side.

The OLT 20 has a function of managing the state of the ONU for each ONU. The ONU state includes, for example, a UNI (User Network Interface) link state, a conduction state, and a test state. The OLT 20 manages the ONU status by, for example, management using operation management maintenance (OAM) or the like, and link status monitoring defined by IEEE 802.3ah. You may manage the state of.

Here, when an ONU is used as an EOAM monitoring point, a maintenance end point (MEP) or a maintenance intermediate point (MIP) defined in the EOAM standard is set in the ONU, and an ETH-CC (Ethernet (registered trademark) Continuity) is set. Check) A connectivity check is performed using a frame or the like, and a network state between MEPs is monitored. The MEP has a function of generating and terminating an OAM frame for fault monitoring and the like. The MIP has a function of notifying information from a lower level MEP to an MEP that is an upper monitoring point.

EOAM monitoring points have a monitoring level, and are used separately for customer management, provider, network operator, physical layer, and the like. Although monitoring is performed between MEPs at the same level, a MIP is defined at a corresponding higher level in order to notify a higher level to a certain level of MEP.

FIG. 2 is a diagram showing a setting example of MEP and MIP in EOAM. FIG. 2 shows an example in which MEP and MIP in EOAM are set by a conventional method in the communication system shown in FIG.

MEPs

30, 32, 33, 34, 35, 36, and 38 are management endpoints that monitor the devices. For example, the

MEPs

32 and 33 monitor between the Ethernet switch 11 and the OLT 20.

MEPs

31 and 37 are management endpoints that monitor the intermediate network (between the Ethernet switch 11 and the I / F 23 of the ONU 21-1). The MEP 39 is a management endpoint set by the user.

MIPs

40 and 43 are management intermediate points set in the monitoring section of the user. The MIP 41 is a management intermediate point that manages the intermediate network. FIG. 2 is an example, and the setting positions of MEP and MIP are not limited to those in FIG.

On the other hand, the OLT 20 and the ONUs 21-1 to 21-3 have already been monitored using, for example, an IEEE 802.3ah OAM, and the OLT 20 is connected to the ONUs 21-1 to 21-3 and the ONUs 21-1 to 21-3. The state 21-3 is managed. There is also a PON system in which the OLT 20 can know the UNI link status (link status between the I / F 23 and the I / F 13) of the ONUs 21-1 to 21-3.

Therefore, even if the EOAM monitoring point is not set to the ONU, the OLT 20 grasps the connection state from the ONUs 21-1 to 21-3 to some extent using the information obtained in the PON system. The OLT 20 can notify the upper monitoring point of the state of the ONU obtained in the PON system.

Therefore, in this embodiment, the OLT 20 reflects the states of the ONUs 21-1 to 21-3 obtained in the PON system in the response in the EOAM. In other words, MEPs and MIPs that should originally be set in the ONUs 21-1 to 21-3 are arranged in the OLT 20 as a proxy. This eliminates the need to set MEPs and MIPs to be set in the ONUs 21-1 to 21-3 in the ONUs 21-1 to 21-3.

FIG. 3 is a diagram showing an arrangement example of MEPs and MIPs according to the present embodiment. In FIG. 2, a proxy MIP 50 is set in the OLT 20 instead of the MIP 43 set in the ONU 21-1, and a proxy MEP 51 is set in the OLT 20 instead of the MEP 37 and MIP 42 set in the ONU 21-1. , Instead of the MEP 38 set in the ONU 21-1, a proxy MEP 52 is set in the OLT 20. The MIP 42 performs a response process to the alarm of the MEP 35, and in the case of using the virtual MEP, the MEP 35 for detecting an abnormality in the PON section at the I / F 24 of the ONU 21-1 has no meaning to define. , MIP42 becomes unnecessary.

FIG. 4 is a diagram illustrating a configuration example of the OLT 20 according to the present embodiment. The I / F 100 in FIG. 4 corresponds to the I / F 25 in FIG. 1, and the I / F 101 corresponds to the I / F 26 in FIG. The I / F 100 includes a PON control unit (first protocol processing unit) 110 that performs processing on the OLT side based on the PON protocol (first protocol), an ONU state management unit (state management unit) 111, a protocol, A conversion unit 112, an EOAM processing unit (second protocol processing unit) 113 that performs processing based on EOAM (second protocol), and an optical transceiver 115 that performs optical signal transmission / reception processing are provided.

Note that the PON protocol is a control protocol used in a MAC (Media Access Control) layer, which is a sublayer of Layer 2, and for example, MPCP (Multi-point Control Protocol) defined by IEEE, OAM and so on.

The PON control unit 110 manages the ONUs 21-1 to 21-3 based on the PON protocol, generates a control frame of the PON protocol, and transmits it to the ONUs 21-1 to 21-3 via the optical transceiver 115. To do. Further, the PON control unit 110 receives control frames of the PON protocol received from the ONUs 21-1 to 21-3 via the optical transceiver 115, and changes the states of the ONUs 21-1 to 21-3 based on the received control frames. Grasp and pass to the ONU state management unit 111. The PON control unit 110 grasps the link connection status and the like using control frames transmitted / received to / from the ONUs 21-1 to 21-3, and controls uplink user traffic. The ONU state management unit 111 holds the states of the ONUs 21-1 to 21-3 as state information for each ONU. The ONU state management unit 111 holds state information for ONUs that do not support EOAM, but does not have to hold state information for ONUs that do not support EOAM.

The protocol conversion unit 112 acquires ONU state information from the ONU state management unit 111, converts this state information into state information of a monitoring point in EOAM, and sets it in the ONU monitoring point 114 arranged in the EOAM processing unit 113. This conversion may be performed, for example, by managing the correspondence between the type of the ONU state and the state of the monitoring point in the EOAM in a table or the like, or may be performed by other methods. Note that the protocol conversion unit 112 may be configured by hardware, S / W, may be included in S / W that manages a higher-level PON system, or a combination thereof. Good. Further, the I / F 100 may be configured as one control unit (control device). When the ONU monitoring point 114 receives an EOAM frame from the MEP facing the proxy monitoring point set to itself, the ONU monitoring point 114 performs processing of the frame, and for those that require a response, the ONU monitoring point 114 is originally set to the ONU. Responds instead of points. The response here includes a case where the proxy monitoring point transmits an EOAM frame and a case where the proxy monitoring point becomes invalid and does not transmit a frame, as will be described later.

FIG. 5 is a diagram illustrating a configuration example of the ONU 21-1 according to the present embodiment. As shown in FIG. 5, the ONU 21-1 includes an I / F (corresponding to the I / F 23 in FIG. 1) 200 and an I / F (corresponding to the I / F 24 in FIG. 1) 201. The I / F 201 includes a PON control unit 211 that performs processing on the ONU side based on the PON protocol, and an optical transceiver 210 that performs transmission / reception processing of an optical signal. The PON control unit 211 processes the control frame received from the OLT 20 via the optical transceiver 210, generates a response frame for the control frame that requires a response, and transmits the response frame to the OLT 20 via the optical transceiver 210. In the present embodiment, it is assumed that ONU 21-1 does not have a function corresponding to EOAM.

For example, it is assumed that the PON control unit 110 of the OLT 20 detects that the UNI link of the ONU 21-1 is in a broken link state. The ONU state management unit 111 holds state information from the PON control unit 110 that the UNI link of the ONU 21-1 is broken. Since the UNI link of the ONU 21-1 is broken, the protocol conversion unit 112 should not be able to respond to the MIP 43 in the configuration shown in FIG. Therefore, the same processing as when the MIP 43 does not respond is performed. In this case, the protocol conversion unit 112 invalidates the MIP 50 (a proxy monitoring point corresponding to the MIP 43) of the ONU monitoring point 114 (converts it to a state that does not respond as state information in EOAM), and the ONU monitoring point does not respond. A similar state is assumed. Thereby, it is possible to detect the same link abnormality as when the MIP 43 does not respond at the opposing MEP point. It should be noted that it is possible to limit the output of the ETH-CC frame for connectivity check that is always transmitted without invalidating the monitoring point.

If the PON control unit 110 detects that the PON link (optical line) with the ONU 21-1 is down, the MEP 37 and MIP 42 should not be able to respond in the case of the configuration shown in FIG. is there. Therefore, by disabling the proxy MEP 51 in the OLT 20, it is possible to grasp that the monitoring points MEP 37 and MIP 42 are not responding in the opposing MEP 31. For example, as an indication of the ONU state in the PON control unit 110, there is an MPCP timeout in the GE-PON system. The MPCP timeout indicates a state in which the report from the ONU is not received by the OLT until the specified time in the Gate-Report control necessary for uplink data communication with the ONU. When the MPCP timeout occurs, the ONU is disconnected. It becomes a state.

FIG. 6 is a flowchart showing an example of a failure monitoring procedure using the proxy monitoring point of the present embodiment. First, the OLT 20 sets a proxy monitoring point instead of the monitoring point set in the ONU 21-1 as the ONU monitoring point 114 (step S1). Specifically, frame parameters and the like in EOAM are set so that the ONU monitoring point 114 can make a response similar to the monitoring point originally set to ONU. Next, in the OLT 20, the protocol conversion unit 112 acquires ONU status information from the ONU status management unit 111 (step S2). The protocol conversion unit 112 determines whether there is a change in the status information of the ONU, and when there is a change (Yes in Step S3), reflects it in the ONU monitoring point 114 (Step S4). Specifically, the ONU monitoring point 114 is set not to transmit a frame, or a failure requiring notification is set to be transmitted using an EOAM frame. The ONU monitoring point 114 performs a response in EOAM. If there is no change in the status information of the ONU (No at Step S3), the process returns to Step S2.

In addition, when the ONU power-off can be detected by the PON control unit 110 of the OLT 20, the protocol conversion unit 112 uses the ONU power-off information obtained from the ONU state management unit 111 to define a vendor defined in advance. A frame of a format may be generated according to a unique OAM and transmitted from the ONU monitoring point 114 to the opposite MEP. As a result, the link disconnection state due to the power supply disconnection can be notified separately from the abnormal state.

As described above, in the present embodiment, the OLT 20 returns a response similar to the monitoring point in the EOAM of the ONU 21-1 based on the EOAM based on the status information of the ONU 21-1 obtained from the PON control unit 110. I made it happen. For this reason, a proxy monitoring point is set in the OLT 20 without setting a monitoring point in the ONU 21-1. From the network side to the slave station device by the EOAM without changing the ONU or with a small change amount. There is an effect that can be managed.

Note that the strict user traffic state cannot be reflected at the proxy monitoring point of the OLT 20. For this reason, in order to notify the user traffic state, only a part of the functions (for example, the function indicating the traffic state such as loopback control which is one of the functions of Ethernet OAM) is limited to the ONU 21-1. You may make it mount by.

Embodiment 2. FIG.
FIG. 7 is a diagram showing a configuration example of a second embodiment of a communication system including a PON system according to the present invention. In the present embodiment, an example in which the ONU 21-1 has a plurality of ports and the UNI is defined for each port will be described. The ONU 21-1 includes I / Fs 23-1 to 23-n (n is an integer of 2 or more), and each I / F corresponds to a different port. The I / Fs 23-1 to 23-n execute UNI processing corresponding to the port to be connected. The configuration of the communication system of the present embodiment is the same as that of the first embodiment except for the ONU 21-1. Hereinafter, a different part from Embodiment 1 is demonstrated.

When the ONU has a plurality of UNIs (lower interfaces), in EOAM, generally, monitoring points such as MEPs and MIPs of ONUs are set for each UNI (for each port). In FIG. 7, the proxy monitoring point for each UNI is set as the ONU monitoring point 114 of the OLT 20 (for the I / F 23-1, the proxy MIP 50 of the MIP 43, the proxy MEP 51 of the MEP 37 are set, ..., I / F 23- For n, an example is shown in which a proxy MIP60 of MIP63 and a proxy MEP61 of MEP64 are set). On the other hand, in the same device, for example, F / W (firmware) update control, continuity state by loopback test, ONU 21-1 link state, etc. are common to the same ONU, not for each UNI. Therefore, there is a part that can share response operations such as MEP and MIP in EOAM.

Therefore, as described in the first embodiment, when the OLT 20 has a monitoring point acting as an ONU, for example, the management ID is assigned to the monitoring point that has the same influence on the same ONU or the same link. Treat as one group. In this group, the management point itself in the OLT 20 is defined as one, and the MEP or MIP response processing for a plurality of UNIs is performed collectively. And about the item which needs to respond for every UNI, the response process for every UNI is implemented.

As described above, an EOAM response process is performed with a monitoring point that commonly affects the same ONU or the same link as one proxy management point in the OLT 20. Therefore, it is possible to save device resources related to EOAM in the OLT 20 and simplify control.

Embodiment 3 FIG.
Next, the communication system of Embodiment 3 concerning this invention is demonstrated. The configuration of the communication system of the present embodiment is the same as that of the first embodiment. Hereinafter, a different part from Embodiment 1 is demonstrated.

In some cases, the OLT 20 may contain both EOAM-compliant ONUs and non-compliant ONUs. Whether EOAM is supported or not can be determined by the type of ONU, the version of S / W, and the like. For this reason, in the present embodiment, the OLT 20 acquires and manages the information indicating the EOAM support status for each ONU from the PON control unit 110 by the ONU state management unit 111. Whether the protocol conversion unit 112 sets a monitoring point in the ONU or a proxy monitoring point in place of the ONU in the OLT 20 based on information managed by the ONU state management unit 111 , Determine. Based on the determination result, the protocol conversion unit 112 determines whether or not the protocol conversion unit 112 reflects the ONU status information on the proxy monitoring point for each ONU, and determines the PON control unit for an ONU that does not support EOAM. Information obtained from 110 is set in the ONU monitoring point 114 arranged in the EOAM processing unit 113. By such processing, management by EOAM is enabled without the administrator being aware of whether or not each ONU supports EOAM. However, since the ONU monitoring point 114 defined in the OLT 20 as a proxy may have a function that cannot be realized in the EOAM, it is desirable that the administrator has a means for knowing the ONU's EOAM support status. Alternatively, the OLT 20 may not check the information indicating the correspondence status, but may check the ONUs 21-1 to 21-3 as necessary.

In the present embodiment, the EOAM support status is determined for each ONU in the communication system of the first embodiment, but the EOAM support status is determined for each ONU in the communication system of the second embodiment. You may make it perform operation | movement of embodiment.

As described above, in the present embodiment, the OLT 20 manages information that supports or does not support EOAM for each ONU based on the information obtained from the PON control unit 110, and monitors the ONU for each ONU. It is determined whether to set a point or to set a monitoring point for the ONU as a proxy in the OLT 20. For this reason, even when ONUs corresponding to EOAM and non-compatible ONUs coexist, management by EOAM can be performed without requiring complicated settings by the administrator.

Embodiment 4 FIG.
FIG. 8 is a diagram illustrating a configuration example of the fourth embodiment of the OLT according to the present invention. The OLT 20a of the present embodiment includes an I / F 100a, an I / F 101 similar to that of the first embodiment, a proxy setting necessity determination unit 102, and a monitoring control I / F 103. The I / F 100a is the same as the I / F 100 of the first embodiment except that the ONU setting control unit 116 is added to the I / F 100 of the first embodiment. Components having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant description is omitted. Hereinafter, a different part from Embodiment 1 is demonstrated.

In this embodiment, the OLT 20a inquires whether each ONU supports EOAM, and determines whether to set a proxy monitoring point of the ONU based on the result of the inquiry. FIG. 9 is a flowchart illustrating an example of a processing procedure of determination processing for determining whether or not proxy monitoring points need to be set according to the present embodiment. As illustrated in FIG. 9, the proxy setting necessity determination unit 102 of the OLT 20a inquires of the ONU about the status of support for EOAM (step S11). Specifically, the proxy setting necessity determination unit 102 instructs the ONU setting control unit 116 to inquire the ONU about the status of EOAM support. The ONU setting control unit 116 instructs the PON control unit 110 to generate a control frame that inquires of the ONU about the EOAM support status based on the PON protocol. The PON control unit 110 transmits a control frame generated based on the PON protocol to the ONU via the optical transceiver 115.

The proxy setting necessity determination unit 102 of the OLT 20a determines whether the response from the ONU is a result that does not support EOAM or whether the response from the ONU is Fail (a normal response to the control frame cannot be received from the ONU). (Step S12). Specifically, when receiving a response to the control frame transmitted in step S11, the PON control unit 110 transmits the response itself or the content of the response via the ONU setting control unit 116 as a proxy setting necessity determination unit 102. To notify. Based on this notification via the ONU setting control unit 116, the proxy setting necessity determination unit 102 determines that the response from the ONU is not compatible with EOAM, or the response from the ONU is Fail (a normal response within a certain time). Is not received). When the ONU is set so as to be able to analyze a control frame for inquiring about the status of support for EOAM, the ONU can respond normally to the control frame, and returns whether or not it is compatible with EOAM as a response frame. To do.

If the response from the ONU is not Fail and the response corresponds to EOAM (No in step S12), the proxy setting necessity determination unit 102 sends the ONU state management unit 111 the corresponding ONU. Is instructed to be set to be EOAM-compatible (information indicating whether or not EOAM is supported is set to Yes) (step S13). Note that the ONU status management unit 111 manages the EOAM response status for each ONU as information as in the third embodiment, and the ONU response status is determined based on an instruction from the proxy setting necessity determination unit 102. Update information.

After step S13, the proxy setting necessity determination unit 102 instructs the ONU to set a normal EOAM monitoring point (step S14), and ends the process. Based on this instruction, the ONU sets an EOAM monitoring point in itself.

When the response from the ONU is “Fail” or the response is not EOAM compliant (Yes in step S12), the proxy setting necessity determination unit 102 makes a response to the ONU state management unit 111. It is instructed to set ONU correspondence status information as not corresponding to EOAM (No indicating information indicating whether or not EOAM correspondence is supported) (step S15).

After step S15, the proxy setting necessity determination unit 102 instructs the EOAM processing unit 113 to set a proxy monitoring point as a proxy for the ONU (step S16), and ends the process. The above processing is performed for each ONU, and for each ONU, it is determined whether to set a monitoring point in the ONU or to set a proxy monitoring point in the OLT 20a. The proxy setting necessity determination unit 102 notifies the higher level side via the monitoring control I / F 103 of the determination result as to whether or not to set a proxy monitoring point. The determination processing for determining whether or not the proxy monitoring point is set as described with reference to FIG. 9 may be performed when an ONU is newly connected, may be performed at regular intervals, or may be performed in any other communication system. This may be performed when a configuration change occurs, and there is no restriction on the execution timing of the determination process for determining whether a proxy monitoring point needs to be set.

In this embodiment, the ONU setting control unit 116 is provided. However, the proxy setting necessity determination unit 102 may communicate with the PON control unit 110 without providing the ONU setting control unit 116.

As described above, in this embodiment, the proxy setting necessity determination unit 102 of the OLT 20a sets a monitoring point in the ONU for each ONU based on the inquiry result as to whether or not the ONU supports EOAM. Whether to set a proxy monitoring point in the EOAM processing unit 113 is determined. Therefore, even when the ONU EOAM response status changes, it is possible to determine whether to set a monitoring point or a proxy monitoring point in the ONU appropriately based on the latest status.

In this embodiment, the proxy setting necessity determination unit 102 is provided in the OLT 20a. However, the proxy setting necessity determination unit 102 may be provided in an external device. FIG. 10 is a diagram illustrating a configuration example of a communication system when the proxy setting necessity determination unit 102 is provided in an external device. The communication system of FIG. 10 includes an OLT 20 similar to that of the first embodiment instead of the OLT 20a, and includes a control management device 70 having a proxy setting necessity determination unit 71. The proxy setting necessity determination unit 71 is the same as the proxy setting necessity determination unit 102 of the OLT 20a. Based on the instruction from the proxy setting necessity determination unit 71 of the control management device 70, the PON control unit 110 of the OLT 20 generates a control frame that inquires the ONU about the EOAM support status based on the PON protocol, It transmits via the optical transceiver 115. Further, the information on whether the response of the control frame is “Fail” and the contents of the response frame when the response is not “Fail” are notified to the proxy setting necessity determination unit 71 of the control management device 70. Based on the notification from the OLT 20, the proxy setting necessity determination unit 71 of the control management device 70 determines whether to set a monitoring point in the ONU for each ONU or to set a proxy monitoring point in place of the ONU in the OLT 20. Make a decision and notify the OLT 20 of the decision result. If the determination result is a result indicating that a proxy monitoring point instead of an ONU is set, the OLT 20 sets a proxy monitoring point in the EOAM processing unit 113 as a proxy for the ONU. On the other hand, when the determination result is a result indicating that a monitoring point is set in the ONU, the ONU is instructed to set the monitoring point.

As described above, the master station device, the control device, the slave station device, the optical communication system, and the fault monitoring method according to the present invention are suitable for a system that performs fault monitoring by EOAM.

10, 11 Ethernet switch, 20 OLT, 21-1 to 21-3 ONU, 12, 13, 14, 15, 23, 23-1 to 23-n, 24, 25, 26, 100, 101, 200, 201 I / F, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 51, 52, 61, 62, 64 MEP, 40, 41, 42, 43, 50, 60, 63 MIP, 70 Control management device, 71, 102 Proxy setting necessity determination unit, 103 Monitoring control I / F, 110, 211 PON control unit, 111 ONU state management unit, 112 Protocol conversion unit, 113 EOAM processing unit, 115, 210 Optical transceiver 116 ONU setting control unit.

Claims

A master station device connected to a slave station device through an optical communication path, communicating with the slave station device using a first protocol, and connected to a higher-level network,
A first protocol control unit for obtaining information indicating a state of the slave station device based on the first protocol;
A state management unit that acquires information indicating the state of the slave station device from the first protocol control unit, and holds the state of each slave station device as state information;
A second protocol control unit that performs communication with the upper network based on a second protocol different from the first protocol;
A protocol conversion unit that performs setting of a proxy point for performing a response equivalent to the case where a monitoring point in the second protocol is set in the slave station device based on the state information to the second protocol control unit When,
A master station device comprising:
2. The master station apparatus according to claim 1, wherein, when the slave station apparatus includes a plurality of lower-order interfaces, a proxy point is set for each lower-order interface.
When the slave station device has a plurality of lower side interfaces, the monitoring points corresponding to the lower side interfaces in the same slave station device are set as one group, and a proxy point is set for each group. The master station device according to claim 1, wherein
Based on the first protocol, for each of the slave station devices, it is determined whether the slave station device is compatible with the second protocol, and the slave station is determined not to be in the second protocol 3. The master station device according to claim 1, wherein the proxy point is set for the device.
A control device in the master station device connected to the slave station device through an optical communication path, communicating with the slave station device using the first protocol, and connected to a higher-level network,
A first protocol control unit for obtaining information indicating a state of the slave station device based on the first protocol;
A state management unit that acquires information indicating the state of the slave station device from the first protocol control unit, and holds the state of each slave station device as state information;
A second protocol control unit that performs communication with the upper network based on a second protocol different from the first protocol;
A protocol conversion unit that performs setting of a proxy point for performing a response equivalent to the case where a monitoring point in the second protocol is set in the slave station device based on the state information to the second protocol control unit When,
A control device comprising:
The slave station device communicates with the first protocol, communicates with an upper network based on a second protocol different from the first protocol, and the slave station device acquired by the first protocol Information indicating a state is held as state information, and a master station device that makes a response equivalent to a case where a monitoring point in the second protocol is set in the slave station device based on the state information; The slave station device that performs communication according to a protocol,
A slave station apparatus that notifies a traffic state according to the second protocol.
An optical device comprising: a slave station device; and a master station device connected to the slave station device via an optical communication path and connected to an upper network, wherein the slave station device and the master station device communicate with each other according to a first protocol. A communication system,
The master station device is
A first protocol control unit for obtaining information indicating a state of the slave station device based on the first protocol;
A state management unit that acquires information indicating the state of the slave station device from the first protocol control unit, and holds the state of each slave station device as state information;
A second protocol control unit that performs communication with the upper network based on a second protocol different from the first protocol;
A protocol conversion unit that performs setting of a proxy point for performing a response equivalent to the case where a monitoring point in the second protocol is set in the slave station device based on the state information to the second protocol control unit When,
An optical communication system comprising:
An optical device comprising: a slave station device; and a master station device connected to the slave station device via an optical communication path and connected to an upper network, wherein the slave station device and the master station device communicate with each other according to a first protocol. A fault monitoring method in a communication system, comprising:
The master station device is
A first protocol processing step of acquiring information indicating a state of the slave station device based on the first protocol;
A state management step of holding information indicating the state of the slave station device acquired in the first protocol processing step as state information for each slave station device;
A second protocol processing step of performing communication with the upper network based on a second protocol different from the first protocol;
A protocol conversion step for setting, for the second processing step, a proxy point for performing a response equivalent to a case where a monitoring point in the second protocol is set in the slave station device based on the status information; ,
A failure monitoring method comprising:
Instructs the first protocol control unit to inquire to the slave station device whether or not it is compatible with the second protocol based on the first protocol, and in response to the inquiry The proxy setting necessity determination part which determines whether the said proxy point used as a proxy of the said slave station apparatus is set to a self-equipment based on this is provided, The Claim 1, 2, or 3 characterized by the above-mentioned. Master station device.
Whether or not the own device is compatible with the second protocol when receiving an inquiry from the master station device as to whether the second protocol is supported based on the first protocol The slave station apparatus according to claim 6, wherein
Instructing the slave station device to perform an inquiry as to whether the slave station device is compatible with the second protocol based on the first protocol, and based on a response to the inquiry, A control management device for determining whether or not to set the proxy point serving as a proxy for the slave station device in the master station device;
Further comprising
The master station device is
8. The optical communication according to claim 7, wherein the inquiry is executed based on the first protocol based on an instruction from the control management apparatus, and a response to the inquiry is notified to the control management apparatus. system.