JP5220656B2 - Network system - Google Patents

Description

  In the present invention, an in-home device connected to a user network and a station device connected to a relay network are managed by the same administrator, and an access network with a different administrator is interposed between the in-home device and the station device. The present invention relates to a network system, and more particularly, to a network system that enables a station device to monitor power-off of a home device via an access network.

  Conventionally, the access network for FTTH (Fiber To The Home), which is a broadband service, has been constructed based on ATM technology, but the access network for FTTH (Fiber To The Home) is also an Ethernet (registered trademark) Technology is beginning to be used. As a result, it has become possible to provide higher-speed services at lower cost by applying Ethernet technology widely used for LAN (Local Area Network) to the access network. Note that the notation that Ethernet is a registered trademark is omitted in the following description.

  In addition, since this type of network system always provides stable services, the maintenance, operation, and management (OAM: Operation Administration) of the line in the end-to-end section from the station device connected to the user network to the in-home device. and management), and in-house devices are maintained and monitored remotely from the station device.

  The maintenance, operation, and management of the track described above require information on the power state of the home device as maintenance information for the home device. The reason why the power status information of the home device is required as the maintenance information of the home device for the maintenance, operation and management of the track will be described below.

  Generally, when the user turns off the power of the home device, the data transmitted from the home device does not reach the station device, and the station device detects a reception signal disconnection alarm as an alarm indicating that no data is received. This reception signal disconnection alarm is also detected in the same manner when a transmission path failure from the in-home apparatus to the station apparatus, for example, a disconnection of an optical fiber constituting the transmission path occurs.

  When the cause of the reception signal disconnection alarm detected by the station device is due to a transmission path failure between the devices, it is a serious failure for the network, and thus a recovery measure is required immediately. On the other hand, when the power of the home device is turned off, it is not a failure and no recovery measures are required. That is, when the station device receives the reception signal disconnection alarm, it is necessary to determine whether a transmission path failure has occurred or whether the power supply of the home device is turned off.

  As a method for the above-described determination, a method of notifying the station apparatus of power state management information indicating that the power of the in-home apparatus has been turned off is usually used.

  In TTC (Telecommunication Technology Committee), 100 Mbit / s point-to-point Ethernet TTC TS-1000 (Non-Patent Document 1) for FTTH is standardized, and maintenance information transmitted and received between a station device and a home device is: It is specified to use a 12-byte maintenance short frame. In this short frame for maintenance, maintenance / monitoring information such as an identifier indicating a maintenance signal frame, a power supply state, a link state, etc. is embedded.

  IEEE 802.3ah (Non-patent Document 2) describes the physical layer and control protocol specifications of Ethernet PON (E-PON) that realizes point-to-multipoint Ethernet connection using PON (Passive Optical Network). The maintenance frame is defined as maintenance / monitoring between the station apparatus and the home apparatus located at both ends of the PON section.

  The maintenance frame uses a frame format compatible with the Ethernet frame and is multiplexed between the user frame and the user frame. A DA (Destination Address) indicating the destination is a multicast address (hexadecimal number: 01-80-C2-00-00-02) assigned to the link control protocol, and SA ( Source Address) is set to the MAC address of the device itself. In the type area indicating the frame type, a value (hexadecimal: 88-09) indicating the Slow protocol used in the link control protocol is set. Sets a value (hexadecimal number: 03) indicating OAM, and the power state and link state are assigned to the flag field.

  Next, transmission of maintenance information of a home device using a maintenance frame defined by IEEE 802.3ah in a conventional E-PON system will be described.

  The subscriber side device of the access network connected to the in-home device via the transmission line, from the Ethernet frame received from the in-home device, DA indicating the destination of the frame is the Slow protocol multicast address (hexadecimal number: 01-80-C2 -00-00-02) and that the type area represents the Slow protocol (hexadecimal number: 88-09), it is determined that the frame is a maintenance frame. Maintenance information such as the power status of the home device is analyzed from the flag area of the maintenance frame, and the power-off status of the home device and the link status with the user terminal are transferred from the subscriber side device of the access network to the access network monitoring control system. Be notified.

JP 2008-11287 A

TTC TS-1000 IEEE 802.3ah Annex 43B Chapter 9 of ITU-T Recommendation Y.1731 OAM PDU TYPES

  With the spread of the Internet, it is indispensable for recent networks to be interconnected on a global scale. For this reason, a technology for connecting networks provided by a plurality of carriers (communication carriers) around the world is required, and the station device connected to the relay network and the in-home device connected to the user network are connected by the same carrier. It is considered that the number of systems that are managed and configure a network by interposing an access network having different carriers (hereinafter referred to as managers) between the station device and the in-home device will increase.

  In such a system configuration, in order to ensure the quality up to the home device that is the end point of the network, it is necessary to provide a system in which the station device can monitor the home device via the access network as described above. .

  The station device connected to the relay network and the in-home device connected to the user network are managed by the same administrator, and an access network of a different administrator is interposed between the station device and the in-home device. In the network system, maintenance and monitoring of the network are performed in units of managers, and monitoring of the relay network and the access network is performed by each monitoring control system.

  As described above, the system in which the monitoring control system for the relay network and the monitoring control system for the access network independently manage the respective networks does not transmit information between the monitoring control systems.

  The maintenance frame defined by IEEE 802.3ah in the E-PON system described as the prior art is managed by the same administrator in the home device connected to the user network and the station device connected to the relay network. When applied to a network system in which an access network provided by a different administrator is interposed between a device and the station device, the maintenance frame including the power state management information is between the home device and the device that directly accommodates the home device. And is not transferred to the relay network side. Therefore, the device on the relay network side cannot obtain maintenance / monitoring information of the home device.

  As a result of the foregoing, an in-house device connected to the user network and a station device connected to the relay network are managed by the same administrator, and an access network provided by a different administrator is provided between the in-home device and the station device. The conventional technology of the intervening network system cannot send and receive maintenance / monitoring information between the monitoring and control systems of the relay network and the access network, and the relay network device obtains the maintenance / monitoring information of the home device. Therefore, the monitoring and control system of the relay network cannot monitor the home device that is the end point of the network, and there is a problem that the communication quality cannot be ensured.

  An object of the present invention is to solve the problems of the prior art as described above, and in a network system in which an administrator has a different access network between a station device and a home device, maintenance of power-off information and the like of the home device It is an object of the present invention to provide a network system in which monitoring information is notified to a station device across an access network so that the station device can detect a power interruption of the in-home device and determine a power recovery.

According to the present invention, the object is that the in-home device connected to the user network and the station device connected to the relay network are managed by the same administrator, and the in-home device is between the in-home device and the station device. In the network system including an access network provided by an administrator different from the administrator of the station apparatus, the station apparatus and the in-home apparatus are ITU-T Recommendation Y. It has a function to terminate and insert Ethernet OAM frames conforming to 1731,
The station apparatus, an Ethernet frame transceiver interface, the discrimination-multiplexing portion of the Ethernet OAM frame, and the Ethernet OAM processing unit, which has a status monitoring unit, the optical network unit to confirm the successful connection of said home apparatus A means for transmitting a periodic monitoring frame, a power-off information detecting means for detecting that the in-home device has been turned off by analyzing the power-off information received from the in-home device, and the in-home device Means for canceling the power-off state of the in-home device by detecting a periodic monitoring response frame to be received,
The home device includes an Ethernet frame transceiver interface, the discrimination-multiplexing portion of the Ethernet OAM frame, and the Ethernet OAM processing unit, the status monitoring unit, which has a power supply voltage monitoring unit, the drop in the power supply voltage of the in-home apparatus A circuit for monitoring and detecting power-off, a transmission means for notifying the station device of power-off information when power-off is detected, and charging a power-supply voltage to secure time for transmitting the power-off information An internal power supply for holding, and means for transmitting a periodic monitoring response frame to the station apparatus after receiving and analyzing the periodic monitoring frame transmitted from the station apparatus,
Further, when the power supply in the home device occurs, the in-home device transmits a plurality of the power-off information to the station device while the internal power source holds a power supply voltage at which the home device can operate. Sent once,
The power-off information, the cycle monitoring frame, and the cycle monitoring response frame are achieved by being transmitted using an Ethernet OAM frame in ITU-T recommendation Y.1731.

  According to the present invention, an in-house device connected to a user network and a station device connected to a relay network are managed by the same administrator, and access provided by different administrators between the in-home device and the station device. In a network system that includes a network, if the external power supply is turned off during operation of the home device, the station device can receive the power-off information of the home device, and the home device is in the power off state. For this reason, it is possible to determine whether the reception signal is interrupted or the reception signal is interrupted due to a transmission line failure.

  As a result, the network system administrator determines that a transmission line that requires maintenance operation is normal, a transmission line that does not require maintenance operation is normal, and that the home device is in a power-off state. This makes it possible to prevent frequent maintenance.

It is a block diagram which shows the structural example of the network system by one Embodiment of this invention. It is a block diagram which shows the structural example of a household device. It is a block diagram which shows the detailed structural example of the Ethernet OAM process part of a subscriber | terminal apparatus. It is a block diagram which shows the structural example of a station apparatus. It is a block diagram which shows the detailed structural example of the Ethernet OAM process part of a station apparatus. It is a figure which shows the structural example of the frame format of the power supply state management frame transmitted / received between a station apparatus and a subscriber | terminal apparatus. It is a figure explaining until the power supply state management flame | frame which the in-home apparatus sent passes through the access networks from which an administrator differs, and arrives at a station apparatus. 5 is a sequence chart for explaining a process from when the in-home device detects the power-off of the in-home device, notifies the station device of power-off information, and until the station device detects the power-off of the home device. It is a sequence chart explaining the example of a process until a station apparatus detects the power supply recovery | restoration of a household device, and cancels | releases power-off information.

  Embodiments of a network system according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration example of a network system according to an embodiment of the present invention.

  A network system according to an embodiment of the present invention shown in FIG. 1 includes a user terminal 107, a user network 102 that accommodates the user terminal 107, a home device 100 connected to the user network 102, a relay network 103, and a relay network. 103, a station apparatus 101 connected to 103, and an access network 104 that connects the station apparatus 101 and the in-home apparatus 100. The relay network 103 and the station apparatus 101 are connected to the supervisory control system 1 (106), and the access network 104 is connected to the supervisory control system 2 (105). The in-home device 100 includes a user network IF unit 108, a frame processing unit 109, a power supply monitoring unit 110, and an access network IF unit 111. The station device 101 includes an access network IF unit 112, a frame processing unit 113, The relay network IF unit 114 is provided.

  In the above description, the station apparatus 101 connected to the relay network 103 and monitored and controlled by the monitoring control system 1 (106) and the in-home apparatus 100 connected to the user network 102 and monitored by the station apparatus 101 have the same management. The access network 104 managed by the administrator and interposed between the station apparatus 101 and the in-home apparatus 100 is managed by an administrator different from the above. Then, the station apparatus 101 monitors the power-off information of the in-home apparatus 100 via the access network 104 with different managers.

  The management range 120 targeted by the present invention is from the relay network 103 to the in-home device 100 that is the end point of the network, and the monitoring control system 1 (106), the relay network 103, and the station device 101 connected to the relay network 103. A user network 102 and a home device 100 connected to the user network 102. A relay network IF unit 114 that is a higher-order interface that configures the station apparatus 101 is connected to the relay network 103, and a user network IF section 108 that is a lower-order interface that configures the in-home apparatus 100 is connected to a customer premises equipment CPE (Customer Premises Equipment). The user terminal 107 possessed by the user is connected. The user terminal 107 is out of the management range targeted by the present invention.

  In the access network 104 with different managers in the network system described above, devices 140-1 and 140-2 (hereinafter referred to as access network devices) provided in the access network 104, which are monitored and controlled by the monitoring control system 2 (105). Is installed). The management range 130 of the access network with different managers includes the monitoring control system 2 (105), the access network 104 with different managers, and the access network devices 140-1 and 140-2.

  The station apparatus 101 and the in-home apparatus 100 described above are ITU-T Recommendation Y. The station apparatus 101 monitors whether the home apparatus 100 is in a controllable state using the OAM frame.

  FIG. 2 is a block diagram illustrating a configuration example of the home device 100. As described with reference to FIG. 1, the in-home device 100 includes a user network IF unit 108, a frame processing unit 109, a power supply monitoring unit 110, and an access network IF unit 111, to which an external power supply 200 is connected.

  The frame processing unit 109 includes an upstream frame discrimination / multiplexing unit 208, a VLAN table 206, an Ethernet OAM processing unit 207, a state monitoring unit 205, and a downstream frame discrimination / multiplexing unit 209. The power supply monitoring unit 110 includes a power supply voltage monitoring unit. 201 and an internal power supply 202 for power-off notification.

  In the above description, when the in-home device 100 is operating normally, the power-off notification internal power source 202 notifies the station device 101 of the power-off information of the in-home device 100. I am charging. When the power supply voltage of the external power supply 200 decreases, the in-home device 100 operates using the power charged in the power supply interruption notification internal power supply 202.

  The power supply voltage monitoring unit 201 monitors the power supply voltage supplied from the external power supply 200. When the power supply voltage supplied from the external power supply 200 decreases, the power supply voltage monitoring unit 201 notifies the state monitoring unit 205 of power-off information, and the device operates. When the power supply voltage becomes possible, power recovery information is notified to the state monitoring unit 205. The power-off notification internal power supply 202 holds the power-supply voltage for a time required to transmit the power-supply state management frame, and is turned off by natural discharge. The power-off notification internal power source 202 can be realized by a capacitor, for example.

  The access network IF unit 111 is an interface for transmitting and receiving signals to and from the access network 104 with different managers, and transmits and receives user frames and OAM frames. The downlink frame discriminating / multiplexing unit 209 determines whether the downlink frame is a user frame or an OAM frame, and if it is a user frame, sends the frame to the user network IF unit 108, and if it is an OAM frame, the Ethernet OAM. The frame is sent to the processing unit 207. Further, the downlink frame discriminating / multiplexing unit 209 sends the OAM frame sent from the Ethernet OAM processing unit 207 to the user network IF unit 108.

  The user network IF unit 108 is an interface for transmitting and receiving signals to and from the user terminal 107 owned by the user, and transmits and receives user frames and OAM frames. The uplink frame discriminating / multiplexing unit 208 discriminates whether the uplink frame is a user frame or an OAM frame, and if it is a user frame, sends the frame to the access network IF unit 111, and if it is an OAM frame, the Ethernet OAM. The frame is sent to the processing unit 207. Further, the upstream frame discrimination / multiplexing unit 208 sends the OAM frame sent from the Ethernet OAM processing unit 207 to the access network IF unit 111.

  The Ethernet OAM processing unit 207 receives the OAM frame transmitted from the downlink frame discriminating / multiplexing unit 209 or the uplink frame discriminating / multiplexing unit 208, reads the MEG level of the OAM frame, and determines the transparency or termination of the OAM frame. To do. That is, when the MEG level of the OAM frame is higher than the termination MEG level held by the own Ethernet OAM processing unit 207, the Ethernet OAM processing unit 207 performs transparent processing on the OAM frame. Here, in the case of an OAM frame sent from the downlink frame discriminating / multiplexing unit 209, the transmission processing returns the OAM frame as it is to the downlink frame discriminating / multiplexing unit 209 and sent from the upstream frame discriminating / multiplexing unit 208. In the case of an OAM frame, the OAM frame is returned to the upstream frame discrimination / multiplexing unit 208 as it is. On the other hand, when the MEG level of the OAM frame is equal to or lower than the termination MEG level held by the own Ethernet OAM processing unit 207, the Ethernet OAM processing unit 207 terminates the OAM frame and performs Ethernet OAM processing. The Ethernet OAM processing unit 207 has a function of generating an OAM frame and transmitting it to the downlink frame discrimination / multiplexing unit 209 or the uplink frame discrimination / multiplexing unit 208. The VLAN table 206 stores VLAN information accommodated in the in-home device 100 and VLAN information used for monitoring control.

  FIG. 3 is a block diagram illustrating a detailed configuration example of the Ethernet OAM processing unit 207 of the home device 100. As shown in FIG. 3, the Ethernet OAM processing unit 207 includes an OAM type determination unit 303, a cycle monitoring response frame generation unit 304, a cycle monitoring frame reception processing unit 305, another OAM frame processing unit 306, and a power supply state management frame generation. Section 307 and an OAM frame multiplexing section 308.

  In the above description, the OAM type determination unit 303 reads the OpCode of the OAM frame transferred from the uplink frame determination / multiplexing unit 208 or the downlink frame determination / multiplexing unit 209, and determines whether the received OAM frame is a periodic monitoring frame. It is determined whether the frame is an OAM frame other than the monitoring frame. The period monitoring frame is an OAM frame for connectivity verification transmitted from the station apparatus 101 to the in-home apparatus 100. When receiving the periodic monitoring frame, the in-home device 100 transmits the periodic monitoring response frame to the station apparatus 101 as the response. When the received OAM frame is a period monitoring frame, the OAM type determination unit 303 transfers the received OAM frame to the period monitoring frame reception processing unit 305 and generates a period monitoring response frame in the period monitoring response frame generation unit 304 Let Further, when the received OAM frame is another OAM frame, the OAM type determination unit 303 transfers the received other OAM frame to the other OAM frame processing unit 306 to perform processing such as an alarm. For example, if the other OAM frame is an alarm, the other OAM frame processing unit 306 generates an alarm frame to be transferred to the station apparatus 101 or the user terminal 107. The power state management frame generation unit 307 receives a power state management frame generation instruction from the state monitoring unit 205 and generates a power state management frame. The OAM frame multiplexing unit 308 multiplexes the OAM frames from the period monitoring response frame generation unit 304, the other OAM frame processing unit 306, and the power supply state management frame generation unit 307, and performs the uplink frame discrimination / multiplexing unit 208 or the downlink frame discrimination / multiplexing. To the unit 209.

  FIG. 4 is a block diagram illustrating a configuration example of the station apparatus 101. As described with reference to FIG. 1, the station apparatus 101 includes an access network IF unit 112, a frame processing unit 113, and a relay network IF unit 114. The frame processing unit 113 includes an upstream frame discrimination / multiplexing unit 404, a VLAN table 402, an Ethernet OAM processing unit 405, a state monitoring unit 403, and a downstream frame discrimination / multiplexing unit 406.

  In the above description, the relay network IF unit 114 is an interface for transmitting and receiving signals to and from the relay network 103, and transmits and receives user frames and OAM frames. The downlink frame discrimination / multiplexing unit 406 determines whether the downlink frame is a user frame or an OAM frame. If the downlink frame is a user frame, the downlink frame discrimination / multiplexing unit 406 transmits the user frame to the access network IF unit 112. When the frame is an OAM frame, the OAM frame is transmitted to the Ethernet OAM processing unit 405. Further, the downstream frame discrimination / multiplexing unit 406 sends the OAM frame sent from the Ethernet OAM processing unit 405 to the access network IF unit 112.

  The access network IF unit 112 is an interface for transmitting and receiving signals to and from the access network 104 with different managers, and transmits and receives user frames and OAM frames. The uplink frame discriminating / multiplexing unit 404 determines whether the uplink frame is a user frame or an OAM frame, and when the uplink frame is a user frame, transmits the user frame to the relay network IF unit 114, When the frame is an OAM frame, the OAM frame is transmitted to the Ethernet OAM processing unit 405. Further, the uplink frame discriminating / multiplexing unit 404 transmits the OAM frame transmitted from the Ethernet OAM processing unit 405 to the relay network IF unit 114.

  The Ethernet OAM processing unit 405 reads the MEG level of the received OAM frame and determines whether the OAM frame is transparent or terminated. That is, when the MEG level of the received OAM frame is higher than the termination MEG level held by the own Ethernet OAM processing unit 405, the Ethernet OAM processing unit 405 performs transparent processing on the OAM frame. Here, in the case of an OAM frame sent from the downlink frame discriminating / multiplexing unit 406, the transmission process is the same as the OAM frame that is returned to the downlink frame discriminating / multiplexing unit 406 and sent from the uplink frame discriminating / multiplexing unit 404. In the case of the received OAM frame, the OAM frame is returned to the upstream frame discrimination / multiplexing unit 404 as it is. On the other hand, when the MEG level of the received OAM frame is equal to or lower than the termination MEG level held by the own Ethernet OAM processing unit 405, the Ethernet OAM processing unit 405 terminates the received OAM frame and performs Ethernet OAM processing. The Ethernet OAM processing unit 405 has a function of generating an OAM frame and transmitting the generated OAM frame to the downlink frame discrimination / multiplexing unit 406 or the uplink frame discrimination / multiplexing unit 404. The VLAN table 402 stores VLAN information accommodated in the station apparatus 101 and VLAN information used for monitoring control.

  FIG. 5 is a block diagram illustrating a detailed configuration example of the Ethernet OAM processing unit 405 of the station apparatus 101. The Ethernet OAM processing unit 405 includes an OAM type determination unit 503, a power state management frame reception processing unit 504, a cycle monitoring response frame reception processing unit 505, another OAM processing unit 506, a cycle monitoring frame generation unit 507, and an OAM frame multiplexing unit 508. Composed.

  In the above description, the OAM type determination unit 503 receives the OAM frame transferred from the uplink frame determination / multiplexing unit 404 or the downlink frame determination / multiplexing unit 406, reads the OpCode of the OAM frame, and the received OAM frame is a power source. It is determined whether the frame is a state management frame, a periodic monitoring response frame, or another OAM frame, and is transferred to the corresponding processing units 504, 505, and 506 according to the determined result. If it is a power state management frame, the power state management frame reception processing unit 504 reads the maintenance information of the in-home device 100. Regardless of whether or not the in-home device 100 is powered off, the periodic monitoring frame generation unit 507 generates a periodic monitoring frame, and periodically determines and multiplexes the generated periodic monitoring frame with respect to the in-home device 100. The data is transmitted from the unit 406.

  When the OAM frame transferred from the uplink frame discriminating / multiplexing unit 404 is a periodic monitoring response frame, the periodic monitoring response frame reception processing unit 505 monitors the connection with the in-home device 100, and the connection line and in-home device 100. Is determined to be normal. Even after checking the normality of the connection with the in-home device 100, the periodic monitoring frame generation unit 507 generates a periodic monitoring frame in order to periodically monitor the connection with the in-home device 100. The periodic monitoring response frame reception processing unit 505 determines that the connection with the home device 100 is disconnected when the reception of the periodic monitoring response frame is not confirmed for a certain period of time, generates an alarm frame, and generates the generated alarm frame as an OAM. The data is transmitted to the frame multiplexing unit 508.

  The OAM frame multiplexing unit 508 multiplexes various frames from the cycle monitoring response frame reception processing unit 505, the other OAM frame processing unit 506, and the cycle monitoring frame generation unit 507, and performs uplink frame discrimination / multiplexing unit 404 or downlink frame discrimination / multiplexing. To the unit 406.

  FIG. 6 is a diagram illustrating a configuration example of a frame format of a power state management frame transmitted and received between the station apparatus 101 and the in-home device 100. Next, a configuration example of a frame format of the power state management frame will be described. The power supply status management frame includes IEEE 802.1ag, ITU-T recommendation Y. It is created using an OAM frame specified in 1731.

  As shown in FIG. 6, the power supply state management frame includes a destination MAC address 600, a transmission source MAC address 601, a VLAN tag 602, a type 603, and a payload 604. The OAM frame type 603 is hexadecimal: 89-02.

  The payload 604 includes an MEG level 605, a version 606, an OpCode 607, a flag 608, a TLV offset 609, and OAM data 610. The MEG level 605 indicates the management level of the OAM frame. OpCode 607 is based on IEEE 802.1ag, ITU-T recommendation Y. This is an identifier for identifying the Ethernet OAM function defined by 1731. In the case of a power supply state management frame, OpCode 607 uses a hexadecimal number: 33, that is, a VSM (Vendor Specific OAM Message) frame. Further, in the case of the VSM frame, the OAM data 610 that can be used uniquely by the vendor stores information for notifying the power-off of the home device 100 that is transmitted and received between the home device 100 and the station device 101. Is done.

  FIG. 7 is a diagram for explaining the process until the power supply state management frame sent out by the in-home device 100 passes through the access network 104 with a different manager and reaches the station device 101. Next, referring to FIG. A process in which the power state management frame transmitted from the in-home device 100 passes through the access network 104 with different managers and reaches the station device 101 will be described.

  Each of the in-home device 100 and the station device 101 is provided with MEP points 701-1 and 701-2 for terminating the OAM frame. In addition, each of the access network devices 140-1 and 140-2 provided in the access network 104 with different managers has a MEP point for terminating an OAM frame transmitted / received in the access network 104 with different managers. 702-1 and 702-2 are provided.

  The MEG level can arbitrarily set the monitoring section, such as an access line or end / end, and the MEG at the MEP point 701-1 set in the in-home device 100 serving as the end point and the station device 101 connected to the relay network 103. The level is set to 3, and the MEG levels of the MEP points 702-1 and 702-2 set in the access network devices 140-1 and 140-2 are set to 2 to 0 which is 3 or less. The operation of the OAM filter according to the MEG level in MEP is described in the YUT Recommendation Y. It conforms to the provisions of 1731.

  In the power supply state management frame to which the power supply state management information of the home device 100 is added, the MEG level 3 set at the MEP point 701-1 of the home device 100 is set in the MEG level 605 area.

  When the access network devices 140-1 and 140-2 receive the power supply state management frame transmitted from the home device 100, the access network devices 140-1 and 140-2 recognize that the received power supply state management frame is an OAM frame, and then the MEG level 605 of the frame. Read. The MEG level 605 of the power state management frame is set to 3 as described above, whereas the MEG level set to the devices 140-1 and 140-2 of the access network is 2. For this reason, the devices 140-1 and 140-2 of the access network determine that the MEG level 605 of the power supply state management frame is higher than the MEG level of the own device and that the OAM frame exceeds the MEG level is received, and the power supply state management Make the frame transparent. As a result, the power state management frame passes through the access network devices 140-1 and 140-2 and is transmitted to the station device 101.

  FIG. 8 is a sequence chart illustrating a process from when the in-home device 100 detects the power-off of the home device, notifies the station device 101 of the power-off information, and until the station device 101 detects the power-off of the home device 100. Next, this will be described.

  The power-off notification internal power supply 202 starts discharging electric charges from its own power supply due to a decrease in the input voltage (808). Usually, the in-home device 100 becomes inoperable when the power supply voltage from the external power supply 200 decreases and the voltage becomes zero, and it becomes impossible to notify the station device 101 of the power-off information. For this reason, when the power supply voltage from the external power supply 200 decreases, the internal power supply 202 for notifying the power supply provided in the in-home device 100 is charged for a certain time after the start of discharge due to the charge charged when the power supply voltage of the device is normal By holding the voltage (809), the in-home device 100 can notify the power-off information. The power-off notification internal power supply 202 is turned off by natural discharge after the power-off information is sent (810).

  The sequence described below is a process in which the in-home device 100 detects a decrease 820 in the input voltage from the external power source 200 to the device and notifies the station device 101 of a power state management frame to which power-off information is added. This process is performed while the internal power supply 202 for power-off notification is held (809) for a certain period of time by the charge charged when the power supply voltage of the apparatus is normal.

(1) The power supply voltage monitoring unit 201 of the in-home device 100 detects that the power supply voltage supplied from the external power supply 200 has decreased 820, and detects a power interruption. The detected power-off information is notified to the state monitoring unit 205 (steps 800 and 801).

(2) Upon receiving the power-off information, the state monitoring unit 205 transfers the power-off information to the Ethernet OAM processing unit 207 and instructs generation of a power-off state management frame. The Ethernet OAM processing unit 207 includes power-off information as a pre-process for notifying the station apparatus 101 of power-off information, because when the power-off information is received, the voltage holding time of the power-off notification internal power supply 202 is limited. Priority is given to the transmission of the power state management frame, and the operation of the processing not related to the generation and transmission of the power state management frame in the Ethernet OAM processing unit 207 is suppressed. Specifically, the OAM frame multiplexing unit 308 stops transmission of the period monitoring response frame from the period monitoring frame reception processing unit 305 and the OAM frame from the other OAM frame processing unit 306 (step 812).

(3) The power-off state management frame is generated by the power-state management frame generation unit 307 that has received an instruction to generate a power-off state management frame from the state monitoring unit 205, and is transmitted from the OAM frame multiplexing unit 308. The power-off state management frame passes through the access network IF unit 111 through the access network IF unit 111 via the uplink frame discrimination / multiplexing unit 208 and reaches the station apparatus 101 (steps 802 and 803).

(4) The internal power supply 202 for power failure notification may discharge an abnormal frame when the charged charge is discharged and the voltage drops when the charge is exhausted. If an abnormal frame is sent out, the transmission line will be stopped during the normal power supply voltage because there is a possibility of affecting other lines in communication in the case of a 1-to-N connection. Let Specifically, the state monitoring unit 205 that instructs transmission of the power supply state management frame stops the operation of the apparatus including control of frame output (step 805).

(5) The station apparatus 101 receives the power supply state management frame indicating the reached power interruption. The received frame is transmitted from the access network IF unit 112 to the uplink frame discrimination / multiplexing unit 404. The uplink frame discriminating / multiplexing unit 404 discriminates that the received frame is an OAM frame because the area of the received frame type 603 is hexadecimal: 89-02, and transmits it to the OAM type discriminating unit 503. The OAM type determination unit 503 determines that the received frame is a power state management frame because the OpCode 607 of the frame is hexadecimal: 33, and transmits the frame to the power state management frame reception processing unit 504. . Then, the power state management frame reception processing unit 504 reads the power state management information 615 of the power state management frame and detects that the in-home device 100 is in a power-off state (step 807).

  FIG. 9 is a sequence chart for explaining an example of processing until the station apparatus 101 detects the power recovery of the in-home apparatus 100 and releases the power-off information. Next, this will be described.

(1) The station apparatus 101 periodically transmits a periodic monitoring frame in order to confirm the normality of connection with the in-home apparatus 100 (step 903-1).

  Here, as the periodic monitoring frame, ITU-T recommendation Y.I. The CCM frame defined in 1731 is used, and the MEG level similar to that set in the power supply state management frame is set in order to pass through the access network 104 with different managers.

  When the home device 100 is operating normally and the home device 100 receives the periodic monitoring frame, the received periodic monitoring frame is transmitted from the access network IF unit 111 to the downlink frame discrimination / multiplexing unit 209. The downlink frame discriminating / multiplexing unit 209 discriminates that the received frame is an OAM frame and transmits it to the OAM type discriminating unit 303 because the type 603 area of the received frame is a hexadecimal number: 89-02. The OAM type discriminating unit 303 discriminates that the received frame is a period monitoring frame when the OpCode 607 of the received frame is a hexadecimal number: 01.

  Then, after the cycle monitoring frame reception processing unit 305 confirms the normality of the cycle monitoring frame and recognizes it as a normal frame, the cycle monitoring response frame generation unit 304 generates a cycle monitoring response frame, and the generated cycle monitoring response The frame is transmitted via the OAM frame multiplexing unit 308, the uplink frame discrimination / multiplexing unit 208, and the access network IF unit 111, passes through the access network 104 with a different manager, and arrives at the station apparatus 101.

  The aforementioned periodic monitoring response frame includes ITU-T recommendation Y. The CCM frame defined in 1731 is used, and the same MEG level as that set in the power supply state management frame is set in order to pass through the access network 104 with different managers.

(2) When the station apparatus 101 transmits the periodic monitoring frame to the in-home apparatus 100 in step 903-1, if the in-home apparatus 100 is powered off (900), the in-home apparatus 100 transmits the periodic monitoring response frame. Since the transmission cannot be performed and the station apparatus 101 cannot receive the periodic monitoring response frame, the station apparatus 101 recognizes that the network connection with the in-home apparatus 100 is not normal.

(3) Since the station apparatus 101 cannot predict the power recovery timing of the in-home apparatus 100, the periodic monitoring frame is transmitted to the in-home apparatus 100 regardless of whether or not the periodic monitoring response frame is received from the in-home apparatus 100. Continuously (steps 903-2 and 903-3).

(4) When the home device 100 is recovered from the power-off state at the time when the station device 101 transmits the periodic monitoring frame to the home device 100 in Step 903-3, the home device 100 receives the information from the station device 101. When the transmitted periodic monitoring frame is received and a plurality of periodic monitoring frames are received, the periodic monitoring response frame is transmitted to the station apparatus 101 by the aforementioned periodic monitoring response frame transmission processing (steps 901 and 902).

(5) The station device 101 receives the periodic monitoring response frame from the in-home device 100, and the periodic monitoring response frame is transmitted from the access network IF unit 112 to the uplink frame discrimination / multiplexing unit 404, and the periodic monitoring response frame If the type 603 area is hexadecimal number 89-02, it is determined as an OAM frame. As a result, the periodic monitoring response frame is transmitted from the upstream frame discriminating / multiplexing unit 404 to the OAM type discriminating unit 503, and then the OAM type is discriminated. The OAM type discriminating unit 503 discriminates that the received frame is a cycle monitoring response frame when the OpCode 607 of the received frame is hexadecimal number: 01, and the cycle monitoring response frame is processed by the cycle monitoring response frame reception processing unit 505. Send to. Thereby, the station apparatus 101 recognizes reception of the period monitoring response frame (step 906).

(6) When the station apparatus 101 receives a plurality of periodic monitoring response frames, the station apparatus 101 recognizes that the power of the in-home apparatus 100 is turned on, and cancels the power-off of the in-home apparatus 100 (steps 907 and 908).

DESCRIPTION OF SYMBOLS 100 Home apparatus 101 Station apparatus 102 User network 103 Relay network 104 Access network 105 Monitoring control system 2
106 Monitoring and control system 1
107 User terminal 108 User network IF unit 109, 113 Frame processing unit 110 Power supply monitoring unit 111, 112 Access network IF unit 114 Relay network IF unit 120 Management range covered by the invention 130 Management range of access networks with different administrators 140- DESCRIPTION OF SYMBOLS 1, 140-2 Device provided in access network 200 External power supply 201 Power supply voltage monitoring unit 202 Internal power supply for power failure notification 205, 403 Status monitoring unit 206, 402 VLAN table 207, 405 Ethernet OAM processing unit 208, 404 Uplink frame discrimination Multiplexing unit 209, 406 Downstream frame discrimination / multiplexing unit 303, 503 OAM type discrimination unit 304 Periodic monitoring response frame generation unit 305 Periodic monitoring frame reception processing unit 306, 506 Other OAM frame processing unit 307 Power supply state management frame generation Unit 308, 508 OAM frame multiplexing unit 504 power supply state management frame reception processing unit 505 period monitoring response frame reception processing unit 507 period monitoring frame generation unit 508 OAM frame multiplexing unit

Claims (4)

The home device connected to the user network and the station device connected to the relay network are managed by the same administrator, and the home device and the administrator of the station device are between the home device and the station device. In a network system with access networks provided by different administrators,
The station device and the in-home device are ITU-T recommendation Y.E. It has a function to terminate and insert Ethernet OAM frames conforming to 1731,
The station apparatus, an Ethernet frame transceiver interface, the discrimination-multiplexing portion of the Ethernet OAM frame, and the Ethernet OAM processing unit, which has a status monitoring unit, the optical network unit to confirm the successful connection of said home apparatus A means for transmitting a periodic monitoring frame, a power-off information detecting means for detecting that the in-home device has been turned off by analyzing the power-off information received from the in-home device, and the in-home device Means for canceling the power-off state of the in-home device by detecting a periodic monitoring response frame to be received,
The home device includes an Ethernet frame transceiver interface, the discrimination-multiplexing portion of the Ethernet OAM frame, and the Ethernet OAM processing unit, the status monitoring unit, which has a power supply voltage monitoring unit, the drop in the power supply voltage of the in-home apparatus A circuit for monitoring and detecting power-off, a transmission means for notifying the station device of power-off information when power-off is detected, and charging a power-supply voltage to secure time for transmitting the power-off information An internal power supply for holding, and means for transmitting a periodic monitoring response frame to the station apparatus after receiving and analyzing the periodic monitoring frame transmitted from the station apparatus,
Further, when the power supply in the home device occurs, the in-home device transmits a plurality of the power-off information to the station device while the internal power source holds a power supply voltage at which the home device can operate. Sent once,
The network system, wherein the power-off information, the periodic monitoring frame, and the periodic monitoring response frame are transmitted using an Ethernet OAM frame in ITU-T recommendation Y.1731. Wherein the home device, upon detection of a power interruption in the home apparatus, after the power failure information transmitted to the station apparatus, characterized in that it comprises control means for inhibiting the frame transmission process to the access network side Item 4. The network system according to Item 1. The power-off information includes ITU-T recommendation Y. The network system according to claim 1 , wherein the network system is transmitted using a VSM frame of Ethernet OAM in 1731. 3. The network system according to claim 1, wherein the periodic monitoring frame and the periodic monitoring response frame are transmitted using an Ethernet OAM CCM frame in ITU-T recommendation Y.1731.