JP4541096B2 - Transmission apparatus and transmission apparatus control method - Google Patents

Description

  The present invention relates to a transmission apparatus connected to an SDH system network and a control method thereof, and in particular, predicts in advance the influence of an operation manager's work related to a line failure or expansion / reduction of a transmission apparatus, thereby managing the operation. The present invention relates to a transmission apparatus and a transmission apparatus control method that enable a person to definitely work quickly.

  Conventionally, a high-speed network controlled by a method called SDH (Synchronous Digital Hierarchy) has been used as a backbone of Internet connection service providers. The SDH method employs a form in which transmission devices are connected in a ring shape using an optical fiber, and the transmission speed reaches several tens of gigabits.

  The SDH network is also characterized by high reliability. In the SDH system, the lines constituting the network are duplexed, and even if a failure occurs on one side, the service can be continued using the other side. Such a method of switching and operating the network in the event of a failure is called ring protection, and there are two types of methods, a UPSR (Unidirectional Path Switched Ring) method and a BLSR (Bidirectional Line Switched Ring) method.

  FIGS. 1-1 to 1-2 are explanatory diagrams for explaining UPSR ring protection. In the UPSR system, as shown in FIG. 1-1, the same data is sent to the east side and the west side, and the data having the better quality is adopted on the receiving side. For this reason, even if a failure occurs anywhere on the ring, as shown in FIG. 1-2, since either the east side or the west side is received, the service does not stop.

  FIGS. 2-1 to 2-2 are explanatory diagrams for explaining the ring protection of the BLSR system. In the BLSR system, as shown in FIG. 2A, data is transmitted only to either the east side or the west side, and one duplexed line is placed in a standby state as a protection line. If a failure occurs somewhere on the ring, as shown in FIG. 2-2, the node at the near end of the location where the failure occurs loops back the data and sends it to the protection line, thereby avoiding service stoppage. .

  In the BLSR system, in order to effectively use the line, there is a case where data is normally flowed without putting the protection line in a standby state. Communication using a protection line is referred to as extra traffic, and is a low-reliability communication in which a connection is disconnected when a network switch occurs during a failure or the like.

  Thus, although it is an SDH system network provided with various functions for realizing high reliability, a high level of knowledge and skill is required for the operation manager to make full use of these functions. In particular, the procedure for upgrading the ring protection from the UPSR system to the BLSR system is complicated, and it is very difficult to implement the service without stopping the service. Therefore, Patent Document 1 proposes a method of automating this upgrade work in order to reduce the burden on the operation manager and to perform the work reliably and quickly.

JP 2002-305526 A

  However, upgrading from the UPSR system to the BLSR system is a very rare operation, and even if this is improved, the daily work of the operation manager cannot be greatly improved. The daily operations of operation managers are mainly to deal with line failures and expansion / reduction of transmission equipment, and it is an important role of operations managers to implement these responses promptly without problems. ing.

  Therefore, in order to reduce the load on the operation manager and realize stable operation of the network, the operation manager's work related to line failures and transmission equipment expansion / reduction is supported to prevent operation errors. It is very important to realize the means to do.

  The present invention has been made to solve the above-described problems caused by the prior art, and predicts in advance the influence of the operation manager's work related to line failures and transmission device expansion / reduction, and operates in accordance with the above. It is an object of the present invention to provide a transmission apparatus and a transmission apparatus control method that enable an administrator to definitely perform work quickly.

  In order to solve the above-described problems and achieve the object, the present invention is a transmission apparatus connected to an SDH network, and updates the network connection information held in the storage means according to the contents of the instruction. If so, switching control means for switching the network configuration to reflect this update of information, operation prediction means for predicting a change in network operation based on the network connection information updated by the switching control means, And a notifying means for notifying the prediction result of the motion predicting means through a display means or a printing means.

  The present invention also relates to a method for controlling a transmission apparatus connected to an SDH network, and updates network connection information held in a storage unit according to the contents of the instruction, and updates this information if necessary. A switching control step for switching the network configuration to reflect the network, an operation prediction step for predicting a change in network operation based on the network connection information updated by the switching control step, and a prediction result of the operation prediction step And a notification step of notifying through the display means or the printing means.

  According to this invention, the switching control step is configured so that only the management information of the storage means can be updated without switching the actual network configuration, and further, the operation of the network is predicted from the updated information of the storage unit. Since the means and the means for notifying the prediction result are provided, the transmission apparatus itself can predict the operation of the network.

  Also, the present invention provides the information saving means for saving the information before the switching control means updates the network connection information, and the information saving means after the operation prediction means completes the prediction. It further comprises information restoring means for restoring the saved network connection information to the state before saving.

  According to the present invention, the network connection information held by the storage means is saved and restored before and after the transmission apparatus predicts the network operation. It is possible to avoid the information for operating the network being destroyed.

  Further, the present invention, in the above invention, further comprises command receiving means for receiving a command for network management and notifying the switching control means of the content of the command, wherein the switching control means is connected to the network from the command receiving means. If the notification of switching the configuration is received, the network connection information held in the storage means is updated in accordance with the contents of the notification, and if necessary, the network connection information is reflected to reflect the update of this information. The configuration is switched.

  According to this invention, since the transmission apparatus is configured to predict the network operation by executing the management command, the administrator can cause the transmission apparatus to predict the network operation at an arbitrary timing.

  The present invention further includes, in the above invention, K1 / K2 byte processing means for detecting a change in K1 / K2 bytes in a frame transmitted over the network and notifying the switching control means of the contents of the change. When the switching control means receives a notification to switch the network configuration from the K1 / K2 byte processing means, it updates the network connection information held in the storage means according to the instruction content of the notification, If necessary, the network configuration is switched to reflect this information update.

  According to the present invention, since the transmission apparatus is configured to predict the network operation according to the change in the contents of the K1 / K2 bytes, the operation of the network operated by the BLSR method is predicted using the existing mechanism. It can be easily realized.

  According to the present invention, the switching control step is configured so that only the management information of the storage means can be updated without switching the actual network configuration, and the operation of the network is predicted from the updated information of the storage unit. Since the means and the means for notifying the prediction result are provided, there is an effect that the transmission apparatus itself can predict the operation of the network.

  In addition, according to the present invention, the network connection information held by the storage unit is saved and restored before and after the transmission apparatus predicts the network operation, so that the transmission apparatus can predict the network operation. As a result, it is possible to avoid the destruction of information for operating the network normally.

  Further, according to the present invention, since the transmission apparatus is configured to predict the network operation by executing the management command, the administrator can cause the transmission apparatus to predict the network operation at an arbitrary timing. There is an effect.

  Further, according to the present invention, since the transmission apparatus is configured to predict the network operation based on the change of the contents of the K1 / K2 bytes, the existing mechanism is used to predict the operation of the network operated by the BLSR method. As a result, there is an effect that it can be easily realized.

  Exemplary embodiments of a transmission apparatus and a transmission apparatus control method according to the present invention will be explained below in detail with reference to the accompanying drawings.

  First, the operation of the transmission apparatus according to the present embodiment will be described with an example. FIGS. 3-1 to 3-7 are explanatory diagrams for explaining the operation of the transmission apparatus when the influence of the forced switching command execution is predicted. The forcible switching command is a command for forcibly switching the network in the network operated by the BLSR method.

  FIG. 3A shows the state of the network before the forced switching command is executed. As shown in the figure, four transmission apparatuses A to D are connected to the network. One of them, the transmission apparatus A, is connected to a management monitoring terminal called OPS (Operation System) via a LAN (Local Area Network).

  In this example, there are four paths on the network. The path 1 is a path using the channel 1 and connects the transmission apparatus B and the transmission apparatus D. The path 2 is a path using the channel 2 and connects the transmission apparatus A and the transmission apparatus B. The path 3 is a path using the channel 3 and connects the transmission apparatus B and the transmission apparatus C. The path 4 is a path using the channel 25 that is a protection line, and connects the transmission apparatus A and the transmission apparatus C.

  Here, it is assumed that the optical fiber between the transmission device A and the transmission device B needs to be exchanged. In this case, the operation manager needs to execute a forced switching command prior to the replacement of the optical fiber so that the data is returned between the transmission apparatuses A and B, but the forced switching command is executed. Then, there is a possibility that path disconnection or momentary disconnection may occur with network switching.

  In order to prevent this, it is necessary to predict a path that is affected by the execution of the forced switching command, and to replace the path in advance so as not to cause a problem. In the past, the path affected by the operation has been predicted based on knowledge and experience by the operation manager. Therefore, it is not uncommon for the path to be broken or momentarily broken due to a judgment error. Therefore, the transmission apparatus according to the present embodiment performs this prediction by the transmission apparatus itself, and suppresses the occurrence of a failure due to a determination error.

  In order to cause the transmission apparatus to predict a path affected by the execution of the forced switching command, the operation manager executes a prediction mode setting command from the OPS. As illustrated in FIG. 3B, the prediction mode setting command input in the OPS is transmitted to each transmission apparatus through the network. This prediction mode setting command is specific to the transmission apparatus according to the present embodiment, and causes the transmission apparatus to transition from a normal state to a state for performing prediction.

  If the transmission apparatus is changed to a state for prediction execution, the operation manager executes a forced switching command from the OPS. This forcible switching command is a command for forcibly performing network switching, and is a command generally provided in a transmission apparatus. The transmission apparatus A that has received the forcible switching command notifies the transmission apparatus B of an instruction to switch the network using the K1 / K2 bytes.

  The K1 / K2 bytes are items existing in the M section overhead of each frame transmitted on the network, and have a role of transmitting control information related to network switching. Here, as shown in FIG. 3C, data “D210” is transmitted from the transmission apparatus A to the transmission apparatus B on the shorter path (short path), and “D218” is transmitted on the longer path (long path). Is transmitted. Each of these instructs the transmission apparatus B to perform network switching.

  Normally, the transmission apparatus B that has received the K1 / K2 byte implements a bridge that is a process for diverting the data received from the east side to the protection line, and uses the K1 / K2 byte to indicate that the bridge has been implemented. Notify other transmission devices. However, here, since the transmission apparatus B has transitioned to the state for executing the prediction, only the notification that the bridge has been implemented is performed using the K1 / K2 bytes without actually performing the bridge. Specifically, as shown in FIG. 3-4, data “D121” is transmitted in the short path and data “D129” is transmitted in the long path.

  The transmission device C, the transmission device D, and the transmission device A that have received the notification that the bridge has been implemented with a long path refers to the management information of the path held by itself, and the path 4 exists in the channel 25 that is the protection line. Recognize In this case, normally, an operation for cutting the path on the protection line is performed. However, since these transmission apparatuses have transitioned to a state for prediction execution, the transmission apparatus notifies the OPS that the path will be disconnected without actually disconnecting the path. As a result, the OPS displays on the screen that the channel 25 path is disconnected, as shown in FIG.

  In a normal case, the transmission apparatus A that has received the notification that the bridge has been implemented through the short path implements a switch that is a process for canceling the transmission of data to the forcibly disconnected side, and informs that fact to K1 / K2. Notify other transmission devices using bytes. At this time, the channel 1 and the channel 2 that have used the line between the transmission apparatus A and the transmission apparatus B are momentarily disconnected by executing the switch.

  However, since the transmission apparatus A has transitioned to the state for executing the prediction, only the notification that the switch has been performed is performed using the K1 / K2 bytes without actually performing the switch. Specifically, as shown in FIG. 3-5, data “D213” is transmitted by the short path and data “D21A” is transmitted by the long path.

  Also, the transmission device A refers to the path management information held by itself and recognizes that the channel 1 and the channel 2 have been momentarily interrupted if switching has been performed, and notifies the OPS to that effect. Notice. As a result, the OPS displays on the screen that channel 1 and channel 2 are momentarily interrupted, as shown in FIG. 3-5.

  The transmission apparatus B that has received a notification from the transmission apparatus A that the switch has been executed normally performs the switch execution and notification using the K1 / K2 bytes. However, since the state is shifted to the state for the prediction execution, only the K1 / K2 bytes are transmitted as in the case of the transmission apparatus A, and the OPS is notified of the instantaneously interrupted path. As a result, the OPS displays on the screen that channel 1 and channel 2 are momentarily interrupted, as shown in FIG. 3-6.

  When the switches in the transmission apparatuses A and B are completed, a series of operations by the forced switching command is completed. Therefore, the operation manager who has confirmed the display contents of the OPS executes a prediction mode cancel command from the OPS. As shown in FIG. 3-7, the prediction mode release command input in the OPS is transmitted to each transmission apparatus through the network. This prediction mode cancel command is specific to the transmission apparatus according to the present embodiment, and returns the transmission apparatus from the state for prediction execution to the normal state.

  If the prediction mode release command is executed, the operation administrator replaces the path to be disconnected and the path to be instantaneously interrupted displayed in OPS, and then re-executes the forced switching command to actually switch the network. To do. Here, since the path that is disconnected or momentarily interrupted by the execution of the forced switching command has already been replaced, no failure occurs.

  Thus, the transmission apparatus according to the present embodiment includes a mode for executing prediction. If the mode is changed to the prediction execution mode, if a command such as a forced switching command is executed, the change that would occur in the network by the command without actually changing the network state. Is notified to the OPS.

  Next, the configuration of the transmission apparatus according to the present embodiment will be described. FIG. 4 is a functional block diagram illustrating the configuration of the transmission apparatus according to the present embodiment. As shown in the figure, the transmission apparatus 100 includes a communication processing unit 110, a network control unit 120, a ring operation control unit 130, and a storage unit 140.

  The communication processing unit 110 is a processing unit that performs transmission and reception of various types of information. The network control unit 120 is a control unit that performs various types of network control, and includes a command receiving unit 121, a K1 / K2 byte processing unit 122, and a switching control unit 123.

  The command receiving unit 121 is a processing unit that receives a network management command such as a forced switching command from the OPS or the front terminal. In addition, the command receiving unit 121 also performs a process of distributing the received command, and when receiving a prediction mode setting command and a prediction mode cancel command, distributes the command to the motion prediction processing unit 131.

  The K1 / K2 byte processing unit 122 monitors the change of the K1 / K2 byte in a frame transmitted over the network, and if there is a change, notifies the switching control unit 123 of the change, and is transmitted over the network. A process is performed in which the K1 / K2 bytes of the requested contents are embedded in the frame and transmitted.

  Here, a bit image of K1 / K2 bytes will be described. FIG. 5 is an explanatory diagram for explaining a bit image of K1 / K2 bytes. As shown in the figure, the upper 4 bits of the K1 byte indicate the type of request. For example, “D” in hexadecimal represents a request for forced switching. The lower 4 bits of the K1 byte indicate the number of the requested node, and the upper 4 bits of the K2 byte indicate the number of the requested node.

  The upper 1 bit of the lower 4 bits of the K2 byte indicates the type of the requested path. Specifically, when this bit is 0, it indicates that the requested path is a short path, and when it is 1, it indicates that the requested path is a long path. The remaining 3 bits indicate the network switching state. For example, “1” in the hexadecimal representation indicates a state where the bridge is performed, and “3” indicates a state where the switch is performed in addition to the bridge.

  The switching control unit 123 is a control unit that controls network switching processing according to the command received by the command receiving unit 121 and the K1 / K2 byte detected by the K1 / K2 byte processing unit 122. When switching the network, normally, after updating the switching state information 143 of the storage unit 140, the communication processing unit 110 performs a process of reflecting the updated content, but the transmission apparatus 100 transitions to a prediction execution mode. If it is, only the switching state information 143 is updated, and the update to the communication processing unit 110 is not performed.

  The ring motion prediction processing unit 130 is a processing unit unique to the transmission apparatus 100 according to the present embodiment, and includes a motion prediction processing unit 131, a switching state save processing unit 132, a switching state restoration processing unit 133, and a prediction result notification. Part 134. The operation prediction processing unit 131 controls transition to and return from the prediction execution mode, and refers to the cross-connect information 142 and the switching state information 143 in the storage unit 140 to execute network management commands such as a forced switching command. It is a processing unit that predicts the execution result.

  The switching state saving processing unit 132 is a processing unit that saves the switching state information 143 in the storage unit 140 as the switching state saving information 144 when the transmission apparatus 100 transitions to the prediction execution mode. On the other hand, the switching state restoration processing unit 133 is a processing unit that returns the information saved as the switching state saving information 144 to the switching state information 143 when the transmission apparatus 100 returns to the normal mode.

  By providing such a mechanism, even if the switching control unit 123 updates the contents of the switching state information 143 while transitioning to the prediction execution mode, the state before the update is restored when returning to the normal mode. That is, it is possible to return to the actual network state.

  The prediction result notification unit 134 is a processing unit that notifies the OPS and the pre-station terminal of the prediction result of the motion prediction processing unit 131. The storage unit 140 is a storage unit that stores various types of information, and stores mode information 141, cross-connect information 142, switching state information 143, and switching state save information 144. The mode information 141 is information indicating whether or not the transmission apparatus 100 is in the prediction execution mode. The cross-connect information 142 is information indicating from which transmission device to which transmission device a path is extended. The switching state information 143 is information indicating the switching state of the network, and the switching state saving information 144 is information indicating the switching state of the network before the transmission apparatus 100 transitions to the prediction execution mode.

  Next, the processing procedure of the transmission apparatus 100 will be described. FIG. 6 is a sequence diagram for explaining a processing procedure when a prediction mode setting command is received. As shown in the figure, the prediction mode setting command issued by OPS is received by the command receiving unit 121 (step S101). Then, the command receiving unit 121 notifies the motion prediction processing unit 131 that the prediction mode setting command has been received (step S102).

  The motion prediction processing unit 131 acquires the mode information 141 and checks whether or not it is in the state of transition to the prediction execution mode (step S103). Do not do. If there is no transition (No at Step S104), the switching state saving processing unit 132 is instructed to save the contents of the switching state information 143 as the switching state saving information 144 (Step S105), and the mode information 141 is updated. The state indicating the transition to the prediction execution mode is set (step S106).

  FIG. 7 is a sequence diagram for explaining a processing procedure when a prediction mode release command is received. As shown in the figure, the prediction mode release command issued in OPS is received by the command receiving unit 121 (step S201). Then, the command receiving unit 121 notifies the motion prediction processing unit 131 that the prediction mode release command has been received (step S202).

  The motion prediction processing unit 131 acquires the mode information 141 and checks whether or not it is in a state of transition to a prediction execution mode (step S203). Don't do it. If there is a transition (Yes at Step S204), the switching state restoration processing unit 133 is instructed to return the contents of the switching state saving information 144 to the switching state information 143 (Step S205), and the mode information 141 is updated. Thus, a state indicating that the mode has been returned from the prediction execution mode to the normal mode is set (step S206).

  FIG. 8 is a sequence diagram for explaining a processing procedure when a forced switching command is received. As shown in the figure, the forcible switching command issued in OPS is received by the command receiving unit 121 (step S301). Then, the command receiving unit 121 notifies the switching control unit 123 that the forced switching command has been received (step S302).

  The switching control unit 123 selects a near-end transmission device that requires network switching, and transmits K1 / K2 byte processing to the network to transmit K1 / K2 bytes to the effect that network switching should be performed. The unit 122 is instructed (step S303), and the K1 / K2 byte processing unit 122 transmits the instructed K1 / K2 byte to the target transmission apparatus (step S304). The processing procedure at the time of receiving this forced switching command is common regardless of whether the transmission apparatus 100 is in the prediction execution mode or the normal mode.

  FIG. 9 is a sequence diagram for explaining a processing procedure when a change in K1 / K2 bytes is detected. As shown in the figure, when detecting the change of the K1 / K2 byte (step S401), the K1 / K2 byte processing unit 122 notifies the switching control unit 123 of the change (step S402).

  Upon receiving the notification, the switching control unit 123 acquires the cross-connect information 142 (step S403) and acquires the switching state information 143 (step S404). Then, it is determined how to update the switching state from the contents of the K1 / K2 bytes and the information acquired in steps S403 to 404 (step S405), and the content of the switching state information 143 is updated according to the determination result. (Step S406).

  For example, if the K1 / K2 byte is the content for notifying that the bridge has been implemented, the switching control unit 123 determines that it is necessary to disconnect the path on the protection line, and switches between the cross-connect information 142 and the switching state. The path on the protection line is extracted from the information 143, and the switching state information 143 is updated so as to disconnect these paths.

  If some kind of notification using the K1 / K2 byte is necessary for the other transmission apparatuses as the switching state is updated (Yes at Step S407), the K1 / K2 byte processing unit 122 is requested to transmit (Step S408). When the K1 / K2 byte processing unit 122 transmits the requested K1 / K2 byte to another transmission device (step S409), the K1 / K2 byte processing unit 122 notifies the switching control unit 123 of the transmission (step S410). When notification to other transmission apparatuses is unnecessary (No at Step S407), Steps S408 to 410 are not executed.

  Here, the switching control unit 123 acquires the mode information 141 (step S411), and confirms whether or not the state is changed to the prediction execution state. If not changed (No at Step S412), the determination result of Step S405 is reflected on the communication processing unit 110 to complete a series of processes (Step S413).

  When transitioning to the prediction execution state, control is transferred to the motion prediction processing unit 131. The motion prediction processing unit 131 acquires the cross-connect information 142 (step S414) and the switching state information 143 (step S415). Based on the determination result of the switching control unit 123 in step S405, the motion prediction processing unit 131 performs path disconnection or instantaneous disconnection. It is determined whether or not a failure has occurred (step S416), and if a failure has occurred, the fact is notified to the OPS (step S417).

  This series of processing procedures is obtained by adding steps S411 to 412 for determining a mode and steps S414 to 417 for performing network operation prediction to the conventional processing procedure. Thus, the transmission apparatus 100 according to the present embodiment realizes a network operation prediction function without greatly changing the conventional processing procedure.

  Up to this point, the transmission apparatus 100 according to the present embodiment has been described by taking as an example the case of predicting the influence of the forced execution command execution. However, when it is desired to predict the influence when a failure occurs in the line in advance, This mechanism can also be used as it is when it is desired to predict in advance the effect of adding / removing transmission equipment.

  It should be noted that when adding / removing transmission apparatuses, a plurality of transmission apparatuses may be added / removed simultaneously. In order to predict the influence in such a case, it is also possible to configure the transmission apparatus 100 so as to be able to predict the influence when switching occurs at a plurality of locations on the network.

  It is also possible to make the transmission apparatus 100 perform operation prediction other than network switching by creating a new command for prediction processing and adding a process corresponding to the command to the operation prediction processing unit 131. For example, it is possible to predict the impact of an upgrade from the UPSR method to the BLSR method by creating an upgrade determination command and adding processing corresponding to the command to the operation prediction processing unit 131.

  10-1 to 10-4 are explanatory diagrams for explaining the operation of the transmission apparatus when executing the upgrade determination command. FIG. 10A illustrates the state of the network before execution of the upgrade determination command. As shown in the figure, four transmission apparatuses A to D are connected to the network.

  This network is operated by the UPSR system, is added by the transmission apparatus A, is dropped by the transmission apparatus C, and is dropped by the transmission apparatus C. The path 1 is added by the transmission apparatus D, and the transmission apparatus B is dropped by the channel 25. There are two paths, path 2. The channel 25 is a channel that becomes a protection line when shifting to the BLSR system.

  Here, it is assumed that the operation manager executes the upgrade determination command after executing the prediction mode setting command from OPS. As shown in FIG. 10-2, the upgrade determination command input in the OPS is transmitted to each transmission apparatus through the network.

  In each transmission apparatus that has received the command, the operation prediction processing unit 131 refers to the cross-connect information 142 and the switching state information 143 to predict the influence of the upgrade. For example, in this case, the operation prediction processing unit 131 of the transmission apparatus A deletes the Add path on the west side of the channel 1 and replaces or deletes the through path of the channel 25 with the channels 2 to 24 as illustrated in FIG. Is determined to be necessary.

  As shown in FIG. 10-4, the prediction result of the operation prediction processing unit 131 of each transmission apparatus is notified to the OPS through the prediction result notification unit 134 and displayed on the OPS screen. The operation manager can complete the upgrade work to the BLSR system without causing a failure by performing the work according to the contents of the display after executing the prediction mode release command.

  As described above, in this embodiment, the transmission apparatus is provided with a mode for executing prediction, and when the transmission apparatus is in this mode, the change is virtually made even if the network configuration should be changed. Since the network change is predicted and notified to the administrator's terminal based on the virtual execution result, the transmission apparatus itself can be made to predict the network change.

(Supplementary note 1) A transmission apparatus connected to an SDH network.
According to the instruction contents, the network connection information held in the storage means is updated, and if necessary, the switching control means for switching the network configuration to reflect this information update,
Operation predicting means for predicting a change in network operation based on the network connection information updated by the switching control means;
And a notification means for notifying the prediction result of the motion prediction means through a display means or a printing means.

(Supplementary Note 2) Information saving means for saving the switching control means before updating the network connection information;
The transmission apparatus according to appendix 1, further comprising information restoring means for restoring the network connection information saved by the information saving means to a state before saving after the operation prediction means completes prediction.

(Additional remark 3) It further includes command accepting means for accepting a command for network management and notifying the switching control means of the content of the command,
When the switching control unit receives a notification to switch the network configuration from the command receiving unit, it updates the network connection information held in the storage unit according to the content of the notification, and if necessary, The transmission apparatus according to appendix 1 or 2, wherein the network configuration is switched to reflect the update of the information.

(Additional remark 4) It further comprises a K1 / K2 byte processing means for detecting a change in K1 / K2 bytes in a frame transmitted over the network and notifying the switching control means of the contents of the change,
When the switching control means receives a notification to switch the network configuration from the K1 / K2 byte processing means, it updates the network connection information held in the storage means in accordance with the contents of the notification, and is necessary. Then, the transmission apparatus according to appendix 1, 2, or 3, wherein the network configuration is switched to reflect the update of the information.

(Supplementary Note 5) A method for controlling a transmission apparatus connected to an SDH network,
According to the instruction content, the network connection information held in the storage means is updated, and if necessary, a switching control step of switching the network configuration to reflect the update of the information,
An operation prediction step for predicting a change in network operation based on the network connection information updated by the switching control step;
And a notification step of notifying the prediction result of the operation prediction step through a display means or a printing means.

(Supplementary Note 6) An information saving step for saving this information before the switching control step updates the network connection information;
6. The transmission apparatus control method according to appendix 5, further comprising an information restoration step of restoring the network connection information saved by the information saving step after the operation prediction step completes the prediction to a state before saving. .

(Additional remark 7) It further includes the command reception process which receives the command for network management, and notifies the content of a command to the said switching control process,
In the switching control step, when a notification to switch the network configuration is received from the command receiving step, the network connection information held in the storage means is updated according to the instruction content of the notification, and if necessary The transmission apparatus control method according to appendix 5 or 6, wherein the network configuration is switched to reflect the update of the information.

(Supplementary note 8) A K1 / K2 byte processing step of detecting a change in K1 / K2 byte in a frame transmitted over the network and notifying the change control step of the change is further included.
If the switching control step receives a notification from the K1 / K2 byte processing step to switch the network configuration, it updates the network connection information held in the storage means according to the contents of the notification, and is necessary. If so, the transmission apparatus control method according to appendix 5, 6 or 7, wherein the network configuration is switched to reflect the update of the information.

  As described above, the transmission apparatus and the transmission apparatus control method according to the present invention are useful for network management work, and in particular, it is important to prevent the occurrence of a failure due to a work mistake and to speed up the work. Suitable for cases.

It is explanatory drawing for demonstrating the ring protection of a UPSR system. It is explanatory drawing for demonstrating the ring protection of a UPSR system. It is explanatory drawing for demonstrating the ring protection of a BLSR system. It is explanatory drawing for demonstrating the ring protection of a BLSR system. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus in the case of estimating the influence of forced switching command execution. It is a functional block diagram which shows the structure of the transmission apparatus which concerns on a present Example. It is explanatory drawing for demonstrating the bit image of K1 / K2 byte. It is a sequence diagram for demonstrating the process sequence at the time of prediction mode setting command reception. It is a sequence diagram for demonstrating the process sequence at the time of prediction mode cancellation | release command reception. It is a sequence diagram for demonstrating the process sequence at the time of forced switching command reception. It is a sequence diagram for demonstrating the process sequence when the change of a K1 / K2 byte is detected. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus when performing an upgrade determination command. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus when performing an upgrade determination command. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus when performing an upgrade determination command. It is explanatory drawing for demonstrating operation | movement of the transmission apparatus when performing an upgrade determination command.

Explanation of symbols

10 bit image 11 content of bit image 100 transmission device 110 communication processing unit 120 network control unit 121 command receiving unit 122 K1 / K2 byte processing unit 123 switching control unit 130 ring motion prediction unit 131 operation prediction processing unit 132 switching state saving processing unit 133 Switching state restoration processing unit 134 Prediction result notification unit 140 Storage unit 141 Mode information 142 Cross-connect information 143 Switching state information 144 Switching state saving information

Claims (4)

A transmission device connected to an SDH network;
When a prediction setting command, which is a command for setting a prediction state for predicting an influence on a currently established transfer route, associated with switching of a data transfer route in the network is received, the own apparatus is shifted to a prediction state. Prediction processing means for causing
A switching control means for virtually switching the data transfer path when the device is in a predicted state by the prediction processing means and receiving a network switching command that is a command for switching the data transfer path;
An operation prediction processing means for predicting a data transfer path that is affected by a virtual transfer path switch among the currently established data transfer paths;
Notification means for notifying the prediction result predicted by the motion prediction processing means;
Transmission apparatus characterized by having a. When the bridge is virtually executed as virtual switching of the data transfer path, the operation prediction processing means uses a protection path in the currently established data transfer path. determines whether there is, if there is a transfer path using the protection path, the transmission apparatus according to claim 1, characterized in that predicts the transfer path is disconnected. When the switch is virtually executed as the virtual switching of the data transfer path, the operation prediction processing means is configured to perform the virtual transfer of the data in the currently established data transfer path. It is determined whether there is a transfer path using a forced disconnect line that is a line that is forcibly disconnected by path switching. If there is a transfer path that uses the forced disconnect line, the transfer path is transmission apparatus according to claim 1 characterized in that expected to be disconnected. A control method for a transmission apparatus connected to an SDH network,
When receiving a prediction setting command, which is a command to enter a prediction state for predicting a change in the data transfer path in the network, a prediction processing step of transitioning the device to a prediction state;
A switching control step of virtually switching the data transfer path when the device is in a predicted state by the prediction processing step and receiving a network switching command that is a command for switching the data transfer path;
An operation prediction processing step of predicting a data transfer path that is affected by a virtual transfer path switch among the currently established data transfer paths;
A notification step of notifying the prediction result predicted by the motion prediction processing means;
A transmission apparatus control method comprising:

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