JP2012010271A - Pon system and station side communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a fault independent of an instruction from an operator based on user declaration to shorten a maintenance time.SOLUTION: A PON (Passive Optical Network) system has: a registration information database 14 that holds registration information of a terminal side communication apparatus 2, which is transmitted from a monitoring control system 3; a registered/unregistered determination part 15 that determines whether or not the terminal side communication apparatus 2 connected to the self equipment 1 is registered, based on the registration information of the terminal side communication apparatus 2, which is held in the registration information database 14; a station side communication state monitoring part 17 that monitors the communication state between the self equipment 1 and a plurality of terminal side communication apparatuses 2; and a PON controller 12 that executes a test for confirming conduction with the self equipment 1 autonomously to the terminal side communication apparatus 2 determined as registered by the registered/unregistered determination part 15, and notifies the monitoring control system 3 when the station side communication state monitoring part 17 determines that the self equipment 1 and the plurality of terminal side communication apparatuses 2 do not communicate with each other.

Description

  The present invention relates to an optical access system, particularly a PON (Passive Optical Network), which connects one station side communication device (OLT: Optical Line Terminal) and a plurality of terminal side communication devices (ONU: Optical Network Unit) via an optical fiber. ) System and station side communication device.

  In the PON system, one OLT and a plurality of ONUs are connected using a passive optical branching device such as an optical fiber and an optical splitter. In this PON system, an ONU is connected to a branch optical fiber installed in a user's house or outdoors, thereby enabling communication with an OLT installed in a station building.

  In general, a service provider that provides a telephone service, Internet data service, video distribution service, etc. to a user via a PON system, after receiving a contract application from the user, a construction worker visits the user's home, Install the ONU.

In installing this ONU, an operator who operates a monitoring control system (OPS: Operation System) of the PON system registers information on the installed ONU in the OLT in advance. Then, when the ONU is connected by a construction worker, the OLT confirms whether the connected ONU is a registered ONU.
Here, when the OLT determines that the connected ONU is a registered ONU, the OLT then performs a continuity check test to check whether the ONU can communicate with the OLT correctly. If the continuity confirmation can be confirmed in this continuity confirmation test, the user can enjoy the service.

Next, one method for starting the continuity confirmation test and confirming the test result will be described below.
First, when the OLT can confirm that the ONU connected by the construction worker is a registered ONU, the OLT notifies the connection information of the registered ONU to the OPS. In OPS, the operator can confirm the connection information of the notified registered ONU on the screen.
On the other hand, if the person in charge of the construction can confirm that the ONU has been connected to the OLT, for example, by a lamp display function provided in the ONU, a telephone etc. confirms that the ONU has been correctly connected to the operator who operates the OPS. Contact by.

Next, the operator who has received a notification from the construction person in charge that the ONU has been successfully connected confirms that the ONU has been correctly connected to the OLT by operating the OPS screen, and then confirms the continuity with the ONU. Perform screen operations to perform the test.
By this operation by the operator, an ONU continuity confirmation test execution instruction is issued from the OPS to the OLT, and the OLT that has received this instruction performs a continuity confirmation test for the ONU. After conducting the continuity confirmation test, the OLT notifies the OPS of the test result.
Next, the OPS displays the test result notified from the OLT on the screen, and the operator confirms the test result by viewing the screen display (see, for example, Patent Document 1).

JP 2006-352327 A JP 2007-142529 A

IEEE Std 802.3TM-2005

In the conventional PON system, when the ONU is installed, a continuity check test between the ONU and the OLT is performed by an operator's operation.
On the other hand, when a failure such as a transmission path occurs in a state where the user after the completion of the construction can enjoy the service, that is, in the state of the service, the user cannot enjoy the service. In this case, the service provider who provides the service knows the occurrence of a failure such as a transmission path for the first time when receiving a report that the service cannot be used from the user, and then starts to identify the location of the failure. Therefore, there is a problem that it takes time for the obstacle identification work time.
In addition, a continuity confirmation test may be performed to specify the location of the failure, but this continuity confirmation test is manually performed. For this reason, there is a problem that it takes time to restore the service.

  The present invention has been made to solve the above-described problems, and monitors the communication state between the OLT and the ONU after starting the service, and autonomously conducts a continuity confirmation test in a state where communication is not performed. As a result, it is possible to detect a failure in the transmission line in advance, and it is possible to deal with the failure without depending on the instruction from the operator based on the user declaration, and to shorten the maintenance time. An object of the present invention is to provide a PON system and a station side communication device.

  The PON system according to the present invention is based on the registration information database that holds the registration information of the terminal side communication device transmitted from the monitoring control system, and the registration information of the terminal side communication device that is held in the registration information database. A registration / unregistration determination unit that determines whether a terminal-side communication device connected to the device is registered, a station-side communication state monitoring unit that monitors communication states between the own device and a plurality of terminal-side communication devices, When the communication status monitoring unit determines that there is no communication between the own device and the plurality of terminal side communication devices, it is autonomous with respect to the terminal side communication device determined to be registered by the registered / unregistered determination unit. And a PON control unit that conducts a continuity confirmation test with itself and notifies the monitoring control system.

  According to this invention, since it is configured as described above, the registration information database that holds the registration information of the terminal side communication device transmitted from the monitoring control system, and the registration information of the terminal side communication device that is held in the registration information database A registration / unregistration determination unit that determines whether or not a terminal-side communication device connected to the own device is registered, and a station-side communication state that monitors communication states between the own device and a plurality of terminal-side communication devices The terminal-side communication determined to be registered by the registered / unregistered determining unit when it is determined by the monitoring unit and the station-side communication state monitoring unit that there is no communication between the own device and the plurality of terminal-side communication devices The device is equipped with a PON control unit that autonomously conducts a continuity confirmation test with its own device and notifies the monitoring control system, thereby monitoring the communication status between the OLT and the ONU after the service is started. Conductive By performing a certification test, it is possible to detect transmission path failures in advance, and it is possible to contribute to improvement of user convenience by reducing maintenance costs by shortening the failure identification work time and early recovery from service unusable state Become. In addition, since it is possible to cope with the trouble before the operator receives a service unavailability report from the user, the service use stop time can be shortened, which contributes to improvement of user convenience.

It is a figure which shows the structure of the PON system which concerns on Embodiment 1 of this invention. It is a figure which shows the data which the ONU registration information database in Embodiment 1 of this invention hold | maintains. It is a sequence which shows the automatic continuity confirmation test process by the PON system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the PON system which concerns on Embodiment 2 of this invention. It is a sequence which shows the automatic continuity confirmation test process by the PON system which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing a configuration of a PON system according to Embodiment 1 of the present invention.
As shown in FIG. 1, the PON system includes an OLT 1, a plurality of ONUs 2, an OPS 3, and an optical splitter 4.

  The OLT 1 transmits and receives optical signals to and from each ONU 2. The OLT 1 includes an NNI (Network Node Interface) unit 11, a PON control unit 12, an optical transceiver 13, an ONU registration information database (DB) 14, an ONU registration / unregistration determination unit 15, an ONU automatic continuity confirmation test control unit 16, The station side communication state monitoring unit 17 and the OPS interface unit 18 are configured.

  The NNI unit 11 is connected to a host device (not shown) and functions as an interface that transmits and receives electrical or optical signals to and from the host device. The NNI unit 11 transmits an electrical or optical signal from the host device to the PON control unit 12, and transmits an electrical or optical signal from the PON control unit 12 to the host device.

The PON control unit 12 controls the PON interface on a link that is a communication path established between each ONU 2 and a PON control unit 21 described later. The PON control unit 12 transmits an electrical or optical signal from the NNI unit 11 to the optical transceiver 13 and transmits an optical signal from the optical transceiver 13 to the NNI unit 11.
The PON control unit 12 acquires the MAC address of the ONU 2 when establishing a link with the PON control unit 21. Data indicating the MAC address acquired by the PON control unit 12 is notified to the ONU registration / unregistration determination unit 15. The PON control unit 12 notifies the OPS 3 via the OPS interface unit 18 when a link with the ONU 2 is established.
Further, when the PON control unit 12 receives information indicating the continuity check test execution instruction for all the registered ONUs 2 from the ONU automatic continuity check test control unit 16, the PON control unit 12 returns a response to the test frame to the corresponding ONU 2. And a test frame is transmitted. Further, when the continuity confirmation test is completed, the PON control unit 12 issues a return path cancellation instruction to the ONU 2 to be tested. Data indicating the result of the continuity confirmation test by the PON control unit 12 is notified to the OPS 3 via the OPS interface unit 18.

  The optical transmitter / receiver 13 transmits / receives an optical signal to / from each ONU 2. The optical transceiver 13 transmits an optical signal from the PON control unit 12 to each ONU 2 via the optical splitter 4, and transmits an optical signal from each ONU 2 via the optical splitter 4 to the PON control unit 12.

  The ONU registration information database 14 holds ONU 2 registration information transmitted from the monitoring control system 2. For example, as shown in FIG. 2, the ONU registration information database 14 stores registration information (MAC address) of each ONU 2 in association with the line card number. The registration information of each ONU 2 held in the ONU registration information database 14 is referred to by the ONU registration / unregistration determination unit 15.

When the ONU registration / unregistration determination unit 15 is notified of the MAC address of the ONU 2 to which the link has been established from the PON control unit 12, whether the MAC address that matches the MAC address is stored in the ONU registration information database 14 To determine whether or not the connected ONU 2 is registered.
Here, if the ONU registration / unregistration determination unit 15 determines that a MAC address that matches the MAC address exists in the ONU registration information database 14 (ONU2 is registered), the automatic continuity confirmation test start preparation is performed. A completion notification is transmitted to the ONU automatic continuity confirmation test control unit 16 to enter a service start state.
On the other hand, if the ONU registration / unregistration determination unit 15 determines that the MAC address that matches the MAC address does not exist in the ONU registration information database 14 (ONU2 is not registered), the automatic continuity confirmation test preparation is not completed. The notification is transmitted to the ONU automatic continuity confirmation test control unit 16.

  The ONU automatic continuity confirmation test control unit 16 manages the continuity confirmation test between the OLT 1 and each ONU 2. The ONU automatic continuity confirmation test control unit 16 transmits the automatic continuity confirmation test start preparation completion notification or the automatic continuity confirmation test preparation incomplete notification received from the ONU registration / unregistration determination unit 15 to the station-side communication state monitoring unit 17. . Further, the ONU automatic continuity confirmation test control unit 16 transmits the continuity confirmation test execution instruction received from the station side communication state monitoring unit 17 to the PON control unit 12.

The station-side communication status monitoring unit 17 is arranged between the NNI unit 11 and the PON control unit 12, and counts the number of Ethernet frames (Ethernet is a registered trademark / hereinafter, omitted from description) passing through the device at regular intervals. It is to be measured.
Further, the station-side communication status monitoring unit 17 monitors the communication status by determining whether or not there is data continuity between the OLT 1 and the plurality of ONUs 2 based on the measured number of Ethernet frames. Here, when the station-side communication state monitoring unit 17 determines that there is no data continuity and receives an automatic continuity confirmation test preparation completion notification from the ONU automatic continuity confirmation test control unit 16, this automatic continuity confirmation is performed. The continuity confirmation test execution instruction for all ONUs 2 corresponding to the test preparation completion notification, that is, all registered ONUs 2 is transmitted to the ONU automatic continuity confirmation test control unit 16.
On the other hand, when the station-side communication state monitoring unit 17 receives the automatic continuity confirmation test preparation incomplete notification from the ONU automatic continuity confirmation test control unit 16, the ONU 2 corresponding to the automatic continuity confirmation test preparation incomplete notification is under construction or the like. Based on the above, it is determined that the service is not in progress, and is excluded from the automatic continuity confirmation test.

  The OPS interface unit 18 communicates with the OPS 3. The OPS interface unit 18 notifies the continuity confirmation test result from the PON control unit 12 to the OPS 3 and transmits the ONU 2 registration information from the OPS 3 to the ONU registration information database 14.

  The OPS 3 monitors and controls the conduction state between the OLT 1 and each ONU 2. The OPS 3 confirms whether or not a failure has occurred between the transmission lines based on the ONU automatic continuity confirmation test result received from the PON control unit 12 via the OPS interface unit 18. Also, registration information of the ONU 2 to be newly installed is transmitted to the OPS interface unit 18.

  The ONU 2 transmits and receives optical signals to and from the OLT 1. The ONU 2 includes an optical transmitter / receiver 20, a PON control unit 21, a UNI (User Network Interface) unit 22, and a MAC (Media Access Control) bridge unit 23.

  The optical transceiver 20 transmits and receives optical signals to and from the OLT 1. The optical transceiver 20 transmits an optical signal from the PON control unit 21 to the OLT 1 through the optical splitter 4, and transmits an optical signal from the OLT 1 through the optical splitter 4 to the PON control unit 21.

The PON control unit 21 establishes a link as a communication path with the PON control unit 12, and controls the PON interface. The PON control unit 21 transmits an electrical or optical signal from the UNI unit 22 to the optical transceiver 20 and transmits an optical signal from the optical transceiver 20 to the UNI unit 22.
Further, the PON control unit 21 sets a return path for returning the test frame received from the OLT 1 inside the ONU 2 and returning it to the OLT 1 in accordance with the return path setting instruction from the PON control unit 12. Thereafter, the test frame received from the OLT is returned to the OLT 1 via the return path. Further, when a return path cancellation instruction is received from the PON control unit 21, the return path setting is canceled.

The UNI unit 22 is connected to a user terminal device (not shown), and functions as an interface that transmits and receives electrical or optical signals to and from the user terminal device. The UNI unit 22 transmits an electric or optical signal from the user terminal device to the PON control unit 21 and transmits an electric or optical signal from the PON control unit 21 to the user terminal device.
The MAC bridge unit 23 performs a bridge process between the PON control unit 21 and the UNI unit 22.

  The optical splitter 4 connects the OLT 1 and each ONU 2. The optical splitter 4 and the OLT 1 are connected by a trunk optical fiber 41, and the optical splitter 4 and each ONU 2 are connected by a branch optical fiber 42.

Next, the operation of the automatic continuity confirmation test after the start of service by the PON system configured as described above will be described.
FIG. 3 is a sequence showing an automatic continuity confirmation test process by the PON system according to the first embodiment of the present invention.
When the ONU 2 is newly installed, the branch line optical fiber 42 laid in the user's house or outdoors is connected to the ONU 2 by a construction worker.

In the automatic continuity confirmation test process by the PON system, first, when the ONU 2 is activated, the PON control unit 12 establishes a link as a communication path with the PON control unit 21 of the ONU 2 (step ST31). As the link establishment procedure in the PON control unit 12, for example, in the case of an Ethernet PON system, there is a Discovery procedure disclosed in Chapter 64 of Non-Patent Document 1.
The PON control unit 12 acquires the MAC address of the ONU 2 when establishing a link with the PON control unit 21. Data indicating the MAC address acquired by the PON control unit 12 is notified to the ONU registration / unregistration determination unit 15. The PON control unit 12 notifies the OPS 3 via the OPS interface unit 18 that a link with the ONU 2 has been established.

  Next, the ONU registration / unregistration determination unit 15 confirms whether the ONU 2 with which the link has been established is registered (step ST32). That is, the ONU registration / unregistration determination unit 15 searches the ONU registration information database 14 for a MAC address that matches the MAC address of the ONU 2 with which the link notified from the PON control unit 12 is established. Then, it is determined whether or not this ONU 2 is registered.

  If the ONU registration / unregistration determination unit 15 determines in step ST32 that the MAC address that matches the MAC address does not exist in the ONU registration information database 14 (ONU2 is not registered), the automatic continuity confirmation test A preparation incomplete notification is transmitted to the ONU automatic continuity confirmation test control unit 16, and the sequence ends.

  On the other hand, if the ONU registration / unregistration determination unit 15 determines in step ST32 that the MAC address that matches the MAC address exists in the ONU registration information database 14 (ONU2 is registered), the automatic continuity confirmation is performed. A test start preparation completion notification is transmitted to the ONU automatic continuity confirmation test control unit 16 to enter a service start state (step ST33).

Next, the station-side communication state monitoring unit 17 measures the number A of Ethernet frames that pass through the own device in a certain time (step ST34).
Next, after measuring the Ethernet frame number A, the station-side communication state monitoring unit 17 measures the Ethernet frame number B passing through the own device after a predetermined time has elapsed (step ST35).
Next, the station-side communication status monitoring unit 17 determines the presence / absence of data conduction between the OLT 1 and the plurality of ONUs 2 based on the Ethernet frame numbers A and B (step ST36). That is, when the Ethernet frame number A is the same as the Ethernet frame number B, the station-side communication state monitoring unit 17 determines that there is no data continuity between the OLT 1 and the plurality of ONUs 2.
In step ST36, when the station-side communication state monitoring unit 17 determines that there is data continuity between the OLT 1 and the plurality of ONUs 2, the sequence ends.

  On the other hand, if the station-side communication state monitoring unit 17 determines in step ST36 that there is no data continuity between the OLT 1 and the plurality of ONUs 2, an ONU automatic continuity confirmation test control unit 16 to the PON control unit 12. Next, the PON control unit 12 starts a continuity confirmation test between the OLT 1 and the ONU 2 (step ST37). That is, the PON control unit 12 issues a return path setting instruction to all the registered ONUs 2 and transmits a test frame. Next, in accordance with the return path setting instruction from the PON control unit 12, the PON control unit 21 returns the test frame received from the OLT 1 inside the ONU 2 and sets a return path for sending it back to the OLT 1. Thereafter, the test frame received from the OLT 1 is returned to the OLT 1 through the return path.

Note that when conducting the automatic continuity confirmation test, a specific logical link or a plurality of logical links are targeted. When a specific logical link is targeted, it is possible to efficiently perform a test and shorten the test time. In addition, when a plurality of logical links are targeted, the test quality can be improved.
A single logical link or a plurality of logical links can be established for each OLT 1 and ONU 2 according to an embodiment of a service provider such as an Internet service or a telephone service. Here, when a plurality of logical links are established between the OLT 1 and the ONU 2, all of the plurality of logical links for each ONU 2 are set as test targets, or the test targets are limited from the plurality of logical links, that is, specified. This means that the logical link of is to be tested. As a method for specifying a test target from a plurality of logical links, a method for determining a test target logical link in advance, or a method for determining the number of test targets in advance and monitoring a communication state, and then There is a method to select the test object from the link.

Thereafter, when the continuity confirmation test is completed, the PON control unit 12 instructs the ONU 2 to be tested to release the return path, and the PON control unit 21 releases the return path setting.
Next, the PON control unit 12 notifies the OPS 3 of data indicating the result of the continuity confirmation test via the OPS interface unit 18.
As a return path setting / cancellation procedure, for example, in the case of an Ethernet PON system, there is an OAM Remote Loopback procedure disclosed in Chapter 57 of Non-Patent Document 1.

  As described above, according to the first embodiment, the number of Ethernet frames is measured by the station-side communication status monitoring unit 17 during service, and when there is no data continuity, the OLT 1 is set for all registered ONUs 2. Since the continuity confirmation test is conducted autonomously and the test result is notified to the operator, it is possible to detect the failure before the user unusable declaration, and the maintenance cost is reduced by shortening the failure identification work time. In addition, it is possible to contribute to improvement of user convenience by early recovery from the service unusable state.

Embodiment 2. FIG.
The station-side communication status monitoring unit 17 according to the first embodiment measures the number of Ethernet frames aggregated from each ONU 2, and if it is determined that the communication is not performed between the OLT 1 and the ONU 2 from the measurement result, Therefore, there is a demerit that the continuity check test time increases as the number of connected ONUs 2 increases. Therefore, the second embodiment shows a configuration in which the communication state between the OLT 1 and each ONU 2 is monitored and the continuity confirmation test is individually performed.
FIG. 4 is a diagram showing a configuration of a PON system according to Embodiment 2 of the present invention. The PON system according to the second embodiment shown in FIG. 4 deletes the station-side communication status monitoring unit 17 from the OLT 1 of the PON system according to the first embodiment shown in FIG. In addition, a terminal-side communication state monitoring unit 24 is added to the ONU 2. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

  The PON control unit 12 transmits data indicating the number of Ethernet frames from each terminal-side communication state monitoring unit 24 to the station-side communication state monitoring unit 19.

When the ONU registration / unregistration determination unit 15 determines that a MAC address that matches the MAC address of the ONU 2 from the PON control unit 12 exists in the ONU registration information database 14 (ONU 2 is registered). Then, an automatic continuity confirmation test start preparation completion notification is transmitted to the station-side communication state monitoring unit 19 to enter a service start state.
On the other hand, if the ONU registration / unregistration determination unit 15 determines that the MAC address that matches the MAC address does not exist in the ONU registration information database 14 (ONU2 is not registered), the automatic continuity confirmation test preparation is not completed. The notification is transmitted to the station side communication state monitoring unit 19.

  Further, the ONU automatic continuity confirmation test control unit 16 transmits the continuity confirmation test execution instruction received from the station-side communication state monitoring unit 19 to the PON control unit 12.

The station-side communication status monitoring unit 19 monitors the communication status of each ONU 2. The station-side communication status monitoring unit 19 receives data indicating the number of Ethernet frames from the terminal-side communication status monitoring unit 24 of the ONU 2 corresponding to the automatic continuity confirmation test preparation completion notification from the ONU registration / unregistration determination unit 15 for a certain period of time. The data is collected every time and the presence / absence of data conduction between the OLT 1 and the ONU 2 is determined.
If the station-side communication state monitoring unit 19 determines that there is no data continuity between the OLT 1 and the ONU 2, the ONU automatic continuity confirmation test control unit 16 issues a continuity confirmation test execution instruction for the ONU 2. Send to.

  The terminal-side communication state monitoring unit 24 is arranged between the UNI unit 22 and the MAC bridge unit 23, and measures the number of Ethernet frames passing through the own device at regular intervals. Data indicating the number of Ethernet frames measured by the terminal-side communication state monitoring unit 24 is transmitted to the OLT 1.

Next, the operation of the automatic continuity confirmation test after the start of service by the PON system configured as described above will be described.
FIG. 5 is a sequence showing an automatic continuity confirmation test process by the PON system according to the second embodiment of the present invention. The operation of the PON system according to the second embodiment shown in FIG. 5 is the same as the operation of the PON system according to the first embodiment shown in FIG. 3 and the operations other than steps ST33 to ST36, and only different processes will be described. Do.

  When the ONU registration / unregistration determination unit 15 determines in step ST62 that the MAC address that matches the MAC address exists in the ONU registration information database 14 (ONU2 is registered), the automatic continuity confirmation test starts. A preparation completion notification is transmitted to the station side communication state monitoring unit 19 to enter a service start state (step ST63).

Next, the station-side communication status monitoring unit 19 receives, from the terminal-side communication status monitoring unit 24, the number of Ethernet frames A passing through the ONU 2 corresponding to the automatic communication confirmation test preparation completion notification at a certain time (step ST64).
Next, the station-side communication status monitoring unit 19 determines from the terminal-side communication status monitoring unit 24 the number of Ethernet frames B passing through the ONU 2 after a predetermined time has elapsed after the terminal-side communication status monitoring unit 24 measures the Ethernet frame number A. Receive (step ST65).
Next, the station-side communication state monitoring unit 19 determines the presence / absence of data conduction between the OLT 1 and the ONU 2 based on the Ethernet frame numbers A and B (step ST66). That is, when the Ethernet frame number A is the same as the Ethernet frame number B, the station-side communication state monitoring unit 19 determines that there is no data continuity between the OLT 1 and the ONU 2.
In step ST66, when the station-side communication state monitoring unit 19 determines that there is data continuity between the OLT 1 and the ONU 2, the sequence ends.

  On the other hand, when determining in step ST66 that there is no data continuity between the OLT 1 and the ONU 2, the station-side communication status monitoring unit 19 transmits a continuity confirmation test execution instruction to the PON control unit 12. Next, the PON control unit 12 starts a continuity confirmation test between the OLT 1 and the ONU 2 (step ST67).

  As described above, according to the second embodiment, the terminal side communication state monitoring unit 24 measures the number of Ethernet frames in each ONU 2 during service, and when there is no data continuity, the OLT 1 is connected to the ONU 2. Since the continuity confirmation test is conducted autonomously and the test result is notified to the operator, it is possible to detect the failure before the user unusable declaration, and the maintenance cost is reduced by shortening the failure identification work time. In addition, it is possible to contribute to improvement of user convenience by early recovery from the service unusable state.

  The station side communication state monitoring units 17 and 19 and the terminal side communication state monitoring unit 24 of the first and second embodiments have been described without limiting the communication state monitoring target. In order to carry out a relatively large amount of communication status monitoring in the units 17 and 19 and the terminal-side communication status monitoring unit 24, traffic having a high communication priority such as a telephone service may be set as a communication status monitoring target. . Here, for traffic having a high communication priority, it is necessary to determine in advance which logical link is to be used among a plurality of logical links.

  1 OLT (station side communication device), 2 ONU (terminal side communication device), 3 OPS (supervisory control system), 4 optical splitter, 11 NNI unit, 12 PON control unit, 13 optical transceiver, 14 ONU registration information database, 15 ONU registration / unregistration determination unit, 16 ONU automatic continuity confirmation test control unit, 17 station side communication state monitoring unit, 18 OPS interface unit, 19 station side communication state monitoring unit, 20 optical transceiver, 21 PON control unit, 22 UNI unit, 23 MAC bridge unit, 24 terminal side communication state monitoring unit, 41 trunk optical fiber, 42 branch optical fiber.

Claims (10)

A station-side communication device; a plurality of terminal-side communication devices that perform communication between the station-side communication device; and a monitoring control system that monitors and controls a conduction state between the station-side communication device and the terminal-side communication device. In the equipped PON system,
The station side communication device is:
A registration information database that holds registration information of the terminal-side communication device transmitted from the monitoring control system;
A registration / unregistration determination unit that determines whether a terminal-side communication device connected to the own device is registered based on registration information of the terminal-side communication device held in the registration information database;
A station side communication state monitoring unit for monitoring a communication state between the own device and the plurality of terminal side communication devices;
The terminal-side communication device that is determined to be registered by the registered / unregistered determination unit when it is determined by the station-side communication state monitoring unit that there is no communication between the own device and the plurality of terminal-side communication devices In contrast, a PON system comprising: a PON control unit that autonomously conducts a continuity confirmation test with itself and notifies the monitoring control system. A station-side communication device; a plurality of terminal-side communication devices that perform communication between the station-side communication device; and a monitoring control system that monitors and controls a conduction state between the station-side communication device and the terminal-side communication device. In the equipped PON system,
The terminal-side communication device is
A terminal-side communication state monitoring unit that monitors a communication state between the own device and the station-side communication device;
The station side communication device is:
A registration information database that holds registration information of the terminal-side communication device transmitted from the monitoring control system;
A registration / unregistration determination unit that determines whether a terminal-side communication device connected to the own device is registered based on registration information of the terminal-side communication device held in the registration information database;
The terminal side communication device that is determined to be registered by the registration / unregistration determination unit and that has been determined by the terminal side communication state monitoring unit to have no communication with itself is autonomously A PON control unit that performs a continuity confirmation test and notifies the monitoring control system of the PON system. The PON system according to claim 1, wherein the station-side communication status monitoring unit monitors a communication status of traffic with high priority. The PON system according to claim 2, wherein the terminal-side communication state monitoring unit monitors a communication state of traffic having a high priority. The PON system according to claim 1, wherein the PON control unit performs a continuity confirmation test for a specific logical link. The PON system according to claim 1, wherein the PON control unit performs a continuity confirmation test on a plurality of logical links. In the station-side communication device that performs communication between a plurality of terminal-side communication devices, and the monitoring control system monitors and controls the conduction state between the terminal device and the terminal-side communication device,
A registration information database that holds registration information of the terminal-side communication device transmitted from the monitoring control system;
A registration / unregistration determination unit that determines whether a terminal-side communication device connected to the own device is registered based on registration information of the terminal-side communication device held in the registration information database;
A station side communication state monitoring unit for monitoring a communication state between the own device and the plurality of terminal side communication devices;
The terminal-side communication device that is determined to be registered by the registered / unregistered determination unit when it is determined by the station-side communication state monitoring unit that there is no communication between the own device and the plurality of terminal-side communication devices In contrast, a station-side communication device comprising a PON control unit that autonomously conducts a continuity confirmation test with its own device and notifies the monitoring control system. 8. The station side communication apparatus according to claim 7, wherein the station side communication state monitoring unit monitors a communication state of traffic having a high priority. 8. The station side communication apparatus according to claim 7, wherein the PON control unit performs a continuity confirmation test for a specific logical link. The station-side communication device according to claim 7, wherein the PON control unit performs a continuity confirmation test on a plurality of logical links.

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