JP3776638B2 - Information communication system, monitoring control apparatus, transmission apparatus and path setting method used in the information communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information communication system compliant with, for example, SDH (Synchronous Digital Hierarchy), a transmission device used in the information communication system, a monitoring control device, and a path setting method in the information communication system.
[0002]
[Prior art]
In recent years, development of broadband ISDN (Integrated Services Digital Network) based on a globally unified user network interface has been demanded, and SDH capable of uniformly multiplexing various high-speed services and existing low-speed services has been standardized. Under such a trend, technological development relating to a network in which a large-capacity optical submarine cable is laid internationally and communication devices compliant with the SDH standard are connected in a ring shape is being actively carried out.
[0003]
SDH is premised on an optical transmission system, and various characteristic functions are provided in order to make use of its enormous bandwidth. For example, in a large-capacity optical submarine cable system to which SDH is applied, a system in which a transmission cable is laid in a ring shape is considered in order to avoid interruption of a signal due to occurrence of a failure. Some systems of this type have a function called APS (Automatic Protection Switching). This function is based on ITU-T Recommendation G. 841 and implements protection of a communication path against a failure of a repeater or a transmission medium of a transmission system.
[0004]
In this SDH transmission system, in order to improve the operation efficiency when there is no failure in the transmission path or the transmission device, for example, traffic with a relatively low priority such as information used for a service that is permitted to be disconnected is reserved. In some cases, the channel is sent to an empty channel in the channel transmission path. This traffic is called part-time traffic.
[0005]
By the way, when a communication path is set as a normal operation, a connection switch for a transmission path in the transmission apparatus is set for each transmission apparatus through which the communication path passes or terminates from the monitoring control apparatus provided in the information communication system. The communication path in the transmission apparatus is connected by sequentially controlling.
[0006]
Therefore, as a normal operation, control of the transmission line connection switch to the transmission apparatus by the monitoring and control apparatus to set the communication path, and control of the transmission line connection switch in each transmission apparatus by starting the APS May conflict.
[0007]
For example, it is assumed that a communication path A has already been set between the transmission apparatuses N1 and N2 in the SDH network including four transmission apparatuses N1 to N4. When a communication path B is newly set up between the transmission apparatuses N3 and N4 using the backup channel transmission path, the supervisory control apparatus switches the connection switch for the backup channel transmission path in the transmission apparatuses N3 and N4 in order to drop the backup channel transmission path. Are controlled sequentially. When the control for N3 is completed and a communication path failure occurs between the transmission apparatuses N1 and N2 immediately before the control for N4, the APS is activated and traffic flowing through the communication path A between the transmission apparatuses N1 and N2 In order to pass, the transmission devices N3 and N4 are controlled to pass through the backup channel transmission path. After this, when the monitoring and control apparatus controls the connection switch of the transmission path of the transmission apparatus N4 in order to drop the protection channel transmission path, it should reach N2 from N1 via N3 and N4 using the protection channel transmission path. The saved traffic between N1 and N2 is dropped at N4, and a misconnection in which N1 and N4 are connected occurs.
[0008]
As described above, when the APS function operates in the transmission apparatus while the communication path is set from the supervisory control apparatus, misconnection may occur as a result of switching the connection switch.
[0009]
Further, as described above, in order to prevent the traffic passing through each communication path from being interrupted by switching the connection switch in each transmission device, communication between all transmission devices on the network stored in each transmission device. All path connection information must match.
[0010]
However, under certain conditions, connection information of communication paths stored in each transmission device may not match.
For example, in the path setting method in the conventional SDH network system, a new communication path is set according to the following procedure.
(A) A switch control command for the connection switch is sequentially given to each transmission device through which the communication path passes or terminates from a monitoring control device provided in the network.
(B) The transmission device that has received the control command performs an operation of switching the connection switch, and when the operation is completed, returns a result response indicating that to the monitoring control device.
(C) When a result response is returned from all the transmission apparatuses to the monitoring control apparatus and the state of the communication path is determined, connection information of communication paths between all transmission apparatuses on the network is transmitted from the monitoring control apparatus to all the transmission apparatuses. The communication path connection information stored in each transmission apparatus is updated.
[0011]
Since such a procedure has been taken, connection information of communication paths stored in each transmission apparatus may be different until the update operation in (C) is completed. If the APS function operates in such a state, a misconnection occurs when the connection switch of the transmission path is switched. In such a case, not only communication is interrupted, but also an incorrect connection destination is connected, which is a very big problem.
[0012]
[Problems to be solved by the invention]
Thus, in the past, the competition between the transmission line connection switch control performed by the supervisory control apparatus for the transmission apparatus to set the communication path and the transmission path connection switch control in each transmission apparatus by the activation of the APS No means for controlling was provided. For this reason, when a failure occurs during the path setting process, the transmission switch connected to the transmission path in each transmission apparatus that is controlled so that traffic is not interrupted by the APS function transmits the monitoring control apparatus that continues the path setting process. In some cases, overwriting may occur due to control of the path connection switch. In this case, traffic may be interrupted or misconnection may occur.
[0013]
Further, after a path is set, if a failure occurs during the sequential notification of communication path connection information between all transmission apparatuses on the network from the monitoring and control apparatus to each transmission apparatus, the communication path connection information is consistent between the transmission apparatuses. Since the APS function operates in a state where it is not done, there is a possibility that traffic is interrupted or misconnection occurs.
[0014]
The present invention has been made in view of the above circumstances, and provides an information communication system that does not cause misconnection or loss of traffic even when a communication path is set, a monitoring control device, a transmission device, and a path setting method used in the information communication system. The purpose is to do.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the information communication system of the present invention provides:
(1) In an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a backup channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices Between each transmission device and a transmission path switching factor provided in each of the plurality of transmission devices and used to determine the state of the connection switch at the time of the failure in order to recover the traffic when the failure of the information communication system occurs. The transmission path determination means for generating a signal for switching the connection switch based on the connection information of the communication path and the current connection switch state in the own device, and the monitoring control device are provided with the highest for all transmission devices. The setting request means for transmitting the setting request of the transmission path switching factor having the priority of the above and the supervisory control device are provided for all transmission devices. A cancellation request means for transmitting a cancellation request for a transmission path switching factor having a priority level, a switching factor storage means provided in each of the plurality of transmission apparatuses and holding a plurality of transmission path switching factors, and a plurality of transmission apparatuses A transmission path switching factor having the highest priority as a transmission path switching factor is set in the switching factor storage means according to a setting request signal from each setting request means, and a cancellation request signal from the cancellation request means is set. Accordingly, the transmission path switching factor having the highest priority is deleted from the switching factor storage means, and the transmission path switching factor has the highest priority among the transmission path switching factors held in the switching factor storage means. A switching factor change means for setting a transmission channel switching factor, and a transmission channel switching factor that is provided in the monitoring control device and has the highest priority as the transmission channel switching factor used to determine the state of the connection switch After the setting, a switching request unit that transmits a signal for switching the connection switch to the plurality of transmission devices, and a connection switch switching unit that is provided in each of the plurality of transmission devices and switches the connection switch according to the connection switch switching signal. It is characterized by comprising.
[0016]
The path setting method of the present invention
(2) A plurality of transmission devices connected via transmission lines having a working channel and a backup channel, and having a function of recovering traffic by switching the state of a connection switch when a failure occurs, and each of the transmission line and the plurality of transmission devices A path setting method in an information communication system including at least one monitoring control device that monitors and controls the highest priority for all transmission devices when setting a communication path from the monitoring control device. A step of transmitting a setting request signal of a transmission path switching factor, and a transmission path switching factor used by each of all transmission apparatuses to determine the state of the connection switch in accordance with the setting request signal from the monitoring control apparatus The step of setting the transmission path switching factor having the highest priority in the switching factor storage means for holding the transmission path, and the transmission path switching having the highest priority. After each of the transmission devices is set, the step of switching the connection switch according to the path setting signal from the supervisory control device and the supervisory control device has the highest priority over all the transmission devices. A transmission path switching factor cancellation request signal having a degree of transmission, and in response to the cancellation request signal from the monitoring control device, the transmission path switching factor having the highest priority is deleted from the switching factor storage means, and the transmission path And a step of setting a transmission path switching factor having the highest priority among the transmission path switching factors held in the switching factor storage means as the switching factor.
[0017]
In the information communication system and path setting method described in (1) and (2) above, prior to normal connection switch switching work, each transmission device is assigned the highest priority among the transmission path switching factors related to at least the switching function. Is set in advance to a high transmission path switching factor. Such transmission path switching factors in the SDH transmission system are described in ITU-T Recommendation G.3. 841 is defined as Lockout Of Protection Span.
[0018]
In this way, even if a failure occurs during the connection switch switching work by the monitoring and control device, it occurs because the transmission path switching factor with the highest priority already exists among the transmission path switching factors to be held. The switching operation of the connection switch does not occur due to the transmission path switching factor due to the failure. As a result, the failure-time switching function does not operate during the connection switch switching operation by the monitoring control apparatus, and therefore, misconnection can be avoided.
[0019]
The information communication system of the present invention
(3) In an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a backup channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices Between each transmission device and a transmission path switching factor provided in each of the plurality of transmission devices and used to determine the state of the connection switch at the time of the failure in order to recover the traffic when the failure of the information communication system occurs. The transmission path determination means for generating a signal for switching the connection switch based on the connection information of the communication path and the current connection switch state in the own apparatus, and the monitoring control apparatus are provided for transmission to all the transmission apparatuses. The function stop requesting means for transmitting a signal for stopping the function of the path determining means and the monitoring control device are provided in the transmission path for all the transmission devices. A function restart request means for transmitting a signal for releasing the function stop of the fixing means, a function stop means provided in each of the plurality of transmission devices, and stopping the function of the transmission path determination means in response to the function stop signal; Provided in each of the plurality of transmission devices, function restarting means for releasing the function stop of the transmission path determination means in response to the release signal, and provided in the monitoring control device, after the function of the transmission path determination means is stopped A connection switch switching requesting means for transmitting a connection switch switching signal to a plurality of transmission devices; and a connection switch switching means provided in each of the plurality of transmission devices for switching the connection switch in response to the connection switch switching signal. It is characterized by doing.
[0020]
The path setting method of the present invention
(4) In an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a backup channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices In the path setting method, when the communication path is set from the monitoring and control device, the state of the connection switch at the time of the failure is detected for all the transmission devices in order to recover the traffic when the failure of the information communication system occurs. Sends a signal to stop the automatic switching function to switch the connection switch based on the transmission path switching factor used to determine the communication path, the connection information of the communication paths between all the transmission devices, and the current connection switch state in the own device And switching the connection switch according to the communication path setting operation from the monitoring control device after the function is stopped , After the connection switch is switched by the control from the monitoring control unit, characterized in that it comprises a step of transmitting a signal for releasing the stop of the automatic switching function from the monitoring control unit for all of the transmission device.
[0021]
In the information communication system described in (3) above, a function stop requesting means for stopping the function of the transmission path determining means and a function restart requesting means for releasing the function stop of the transmission path determining means are provided. Prior to the switching operation of the connection switch, the switching function at the time of failure in each transmission apparatus is directly stopped.
[0022]
Further, in the path setting method described in (4) above, the switching function at the time of failure in each transmission apparatus is directly stopped prior to the switching operation of the connection switch from the monitoring control apparatus.
[0023]
In this way, even if a failure occurs during the switching operation of the connection switch from the monitoring and control device, the switching function at the time of the failure is stopped, so the switching operation of the connection switch by this function does not occur. Become. As a result, the switching operation of the connection switch by the failure switching function during the switching operation of the connection switch from the supervisory control device does not occur, and therefore, misconnection can be avoided.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is an actual configuration diagram of an information communication system according to an embodiment of the present invention. In this embodiment, a ring network compliant with SDH is assumed, and m transmission apparatuses N1 to Nm are connected in a ring shape via a high-speed line (such as an STM-16 line) FL. Of the information transmitted through the high-speed line FL, information on the channel addressed to the own apparatus is dropped on the low-speed line SL in the transmission apparatuses N1 to Nm and sent to a communication apparatus (not labeled) such as an exchange.
[0025]
The high-speed line FL is composed of clockwise and counterclockwise working channel transmission lines and clockwise and counterclockwise standby channel transmission lines. Even if these four types of transmission lines are respectively passed through four separate fibers, the working channel transmission line and the protection channel transmission line are multiplexed, and the clockwise working channel transmission line and the protection channel transmission line are combined into one cable. The working channel transmission path and the backup channel transmission path that are counterclockwise may be passed through another fiber through the fiber. Further, the clockwise and counterclockwise working channel transmission paths may be passed through one fiber, and the clockwise and counterclockwise standby channel transmission paths may be passed through another fiber.
[0026]
Each of the transmission devices N1 to Nm is connected to the monitoring control devices WS1 to WSm via LANs (Local Area Networks) L1 to Lm, respectively. These monitoring control devices WS1 to WSm are realized as, for example, general-purpose workstations, and can perform monitoring control on the transmission devices N1 to Nm from any of the monitoring control devices WS1 to WSm.
[0027]
FIG. 2 shows a main part configuration of each of the transmission apparatuses N1 to Nm. Each of the transmission apparatuses N1 to Nm includes an add / drop multiplexer (ADM) 201, and transmits synchronous transmission data transmitted via the high-speed line FL to high-speed side interface units (HS I / F) 202-1 to 202-4. Are added to the add / drop multiplexer 201 and further dropped to the low-speed line SL side via the low-speed side interface unit (LS I / F) 203. Each of the transmission devices N1 to Nm introduces synchronous transmission data input from the low-speed line SL side into the add / drop multiplexer 201 via the low-speed side interface unit 203 and adds it to the high-speed line FL. .
[0028]
Operation control for the add / drop multiplexer 201 is performed by the control unit 204 based on information given from the high-speed side interface units 202-1 to 202-4.
[0029]
The control unit 204 is realized by, for example, a microcomputer, and in addition to a known communication and control unit that performs information communication with other transmission devices N and the monitoring control device WS, the transmission path determination unit 204a, A connection switch switching unit 204b, a transmission path switching factor changing unit 204c, and a ring map updating unit 204d are provided.
[0030]
The storage unit 205 stores data related to various controls such as connection information of communication paths between all transmission apparatuses and transmission path switching factors. The storage unit 205 is configured to store a plurality of transmission path switching factors. Therefore, the storage unit 205 may store a new transmission path switching factor from the transmission path switching factor change unit 204c and a transmission path switching factor from the monitoring control device in addition to the transmission path switching factor that has already been stored. it can.
[0031]
The transmission path switching factor change unit 204c determines a transmission path switching factor based on the failure information of the own device and information exchanged between the transmission devices using the K1 and K2 bytes when a failure occurs. Then, the transmission path switching factor change unit 204c is the most important among the determined transmission path switching factor, the transmission path switching factor from the monitoring and control apparatus, and the current transmission path switching factor stored in the storage unit 205. The high-priority transmission path switching factor is determined as a new transmission path switching factor used for determining the state of the connection switch of the own apparatus. The transmission path determination unit 204a includes a transmission path switching factor used to determine the state of the new connection switch, connection information of communication paths between all transmission apparatuses stored in the storage unit 205, and the own apparatus. Based on the current connection switch state of the internal transmission line, in order to recover the traffic, the state of the new connection switch of the transmission line of its own device is determined.
[0032]
Also, the transmission path switching factor change unit 204c adds a transmission path switching factor from the monitoring control device or a transmission path switching factor newly generated due to a failure to a plurality of transmission path switching factors already stored in the storage unit 205. It has a function.
[0033]
The transmission path switching factor is information that is referred to when the connection switch in the transmission apparatus is switched. Each transmission path switching factor has a priority. The transmission path switching factor includes a transmission path switching factor having the highest priority and at least one transmission path that has a lower priority than the highest priority switching factor and is used as a transmission path switching factor when a failure occurs. Switching factors are included. Examples of such transmission path switching factors include ITU-T recommendation G.264 as shown in FIG. Some of them are defined as protection groups at 841.
[0034]
In normal operation, the connection switch switching unit 204b switches the connection switch of its own device in response to a connection switch switching request from the monitoring control device. When a failure occurs, the connection switch switching unit 204b is based on the state of the new connection switch determined by the transmission path determination unit 204a. The connection switch of the own device is switched. The transmission path determination unit 204a and the connection switch switching unit 204b allow the ITU-T Recommendation G. The APS function defined in 841 is realized.
[0035]
The connection switch allows traffic from a low-speed line to flow in a clockwise or counterclockwise working channel transmission line or a clockwise or counterclockwise standby channel transmission line, or in a clockwise or counterclockwise working channel transmission line or clock. This is a switch for dropping traffic from a standby or counterclockwise standby channel transmission line to a low-speed line or passing through traffic sent from an adjacent node to another adjacent node.
[0036]
The ring map update unit 204d updates the ring map stored in the storage unit 205 with the ring map sent from the monitoring control device. The ring map includes communication path connection information between all transmission apparatuses.
[0037]
Next, the configuration of the monitoring control devices WS1 to WSm will be described with reference to FIG. The monitoring control devices WS1 to WSm include an input / output unit 206 including a keyboard and a display, an interface unit (I / F) 207 that realizes an interface function between the communication management network MNW, a program related to monitoring control, and the like. And a main control unit 209 that controls the input / output unit 206 and the interface unit (I / F) 207 based on a control program stored in the storage unit 208.
[0038]
The main control unit 209 is realized by, for example, a microcomputer and the like, in addition to the known communication and control unit that performs information communication with the transmission apparatuses N1 to Nm, the highest priority switching factor setting request unit 209a A connection switch switching request unit 209b, a ring map update request unit 209c, and a highest priority switching factor release request unit 209d.
[0039]
The highest priority switching factor setting request unit 209a sends a lockout of protection span, which is a transmission channel switching factor having the highest priority, to each of the transmission apparatuses N1 to Nm.
[0040]
The connection switch switching request unit 209b requests the transmission apparatus N that should switch the connection switch to pass or terminate the communication path, for example, based on the operation of the operator, to switch the connection switch.
[0041]
The ring map update request unit 209c generates a ring map after a response indicating that the switching of the connection switch has been completed is returned from all the transmission apparatuses that should perform the switching of the connection switch, and the ring map is updated to each transmission apparatus N1. Send to ~ Nm.
[0042]
The highest priority switching factor release request unit 209d requests each of the transmission apparatuses N1 to Nm to cancel the Lockout Of Protection Span after completion of the ring map update operation in each of the transmission apparatuses N1 to Nm.
[0043]
Next, a connection switch switching process in the information communication system configured as described above will be described with reference to FIGS. FIG. 5 shows a logical configuration of the information communication system according to the present embodiment. In the following description, it is assumed that various controls related to switching of connection switches are performed for the three transmission devices N1 to N3 from the supervisory control device WS1, and the transmission devices that should actually switch the connection switches are N2 and N3. To do. A communication management network MNW for exchanging various types of control information between the monitoring control device WS1 and the transmission devices N1 to N3 is formed.
[0044]
In the message sequence diagram of FIG. 6, when the communication path setting operation is started, the supervisory control device WS1 uses the highest priority switching factor setting request unit 209a to set the highest priority switching factor (Lockout Of Protection Span) setting request signal. 304 to 306 are sent to the transmission apparatuses N1 to N3. In response to this, each of the transmission apparatuses N1 to N3 stores the Lockout Of Protection Span as a new transmission path switching factor in addition to the transmission path switching factor stored in the storage unit 205 by the switching factor change unit 204c. 205 stores the result. Thereafter, each of the transmission apparatuses N1 to N3 returns response signals 307 to 309 indicating that the change has been completed to the monitoring control apparatus WS1.
[0045]
When a failure occurs during switching of the connection switch from the monitoring control device WS1, the transmission path switching factor changing unit 204c uses the failure information of the own device and information exchanged between the transmission devices using the K1 and K2 bytes. Based on this, a transmission path switching factor is determined and stored in the storage unit 205. Next, the transmission path switching factor change unit 204c sequentially compares the determined priority of the transmission path switching factor with the priority of the transmission path switching factor already stored in the storage unit 205 before the determination. The storage unit 205 stores the highest priority switching factor, and the transmission path switching factor determined by the occurrence of a failure has a lower priority than the highest priority switching factor. The changing unit 204c does not control the connection switch switching unit 204b, and the connection switch is not switched.
[0046]
When the response signals 307 to 309 are received, the monitoring control device WS1 sends connection switch switching request signals 310 and 311 to the transmission devices N2 and N3 that should switch the connection switch by the connection switch switching request unit 209b. In response to this, the transmission devices N2 and N3 switch the connection switch by the connection switch switching unit 204b, and return response signals 312 and 313 indicating that the switching of the connection switch has been normally completed to the monitoring control device WS1.
[0047]
Upon reception of the response signals 312, 313, the supervisory control device WS1 creates a ring map at this time by the ring map update request unit 209c, and transmits ring map update request signals 314 to 316 including this ring map information. Send to devices N1-N3. In response to this, each of the transmission apparatuses N1 to N3 updates the ring map stored in the storage unit 205 by the ring map update unit 204d and sends response signals 317 to 319 indicating that the update has been normally completed. Return to the monitoring control device WS1.
[0048]
Upon receiving the response signals 317 to 319, the supervisory control device WS1 sends request signals 320 to 322 requesting cancellation of Lockout Of Protection Span to the transmission devices N1 to N3 by the highest priority switching factor release request unit 209d. To do. In response to this, each of the transmission apparatuses N1 to N3 is locked out by the transmission path switching factor changing unit 204c.
Delete the protection span from the storage unit 205.
[0049]
If a failure has occurred while the transmission path switching factor has been changed to the highest priority switching factor due to a request from the supervisory control device WS1, each of the transmission devices N1 to N3 acquires a Lockout Of Protection Span from the storage unit 205. After erasing, the connection switch is switched as necessary based on the transmission path switching factor having the highest priority among the transmission path switching factors stored in the storage unit 205, a new ring map, failure information, and the like. When these controls are completed, each of the transmission apparatuses N1 to N3 returns response signals 323 to 325 indicating that to the monitoring control apparatus WS1.
[0050]
In the above process, information exchange between each of the transmission apparatuses N1 to N3 and the monitoring control apparatus WS1 is performed via a data communication channel (DCC) defined in the section overhead (SOH) of the STM signal.
[0051]
As described above, in the present embodiment, the supervisory control device WS1 sends the highest priority switching factor setting request signals 304 to 306 to the transmission devices N1 to N3 in advance of switching of the connection switch from the supervisory control device WS1. The transmission path switching factor of each of the transmission apparatuses N1 to N3 is set to the transmission path switching factor having the highest priority. For this reason, even if a failure occurs during the switching of the connection switch from the monitoring control device WS1, the transmission path switching factor is not changed by the transmission channel switching factor changing unit 204c. Also not done. In addition, since the highest priority transmission path switching factor is canceled after the ring maps in all the transmission apparatuses N1 to N3 are updated, the connection switches are maintained while the ring maps are different in the respective transmission apparatuses N1 to N3. Is not switched. Therefore, it is possible to avoid misconnection when the connection switch is switched by the monitoring control device.
[0052]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The information communication system of the present embodiment also assumes the configuration shown in FIGS. However, the configurations of the transmission device and the monitoring control device are different from those of the first embodiment. For the sake of distinction, in this embodiment, the transmission devices are denoted by reference numerals n1 to nm and the monitoring control device is denoted by ws1 to wsm. Show. In addition, the same code | symbol shall be attached | subjected to another identical part.
[0053]
FIG. 7 shows the configuration of the transmission apparatuses n1 to nm in the present embodiment. The transmission devices n1 to nm have substantially the same configuration as that of the transmission devices N1 to Nm, but are different in the configuration of the control unit.
[0054]
The control unit 240 is realized by a microcomputer, for example, and is a known communication and control unit that performs information communication with other transmission devices and monitoring control devices ws1 to wsm, a transmission path determination unit 204a, a connection switch, and the like. In addition to the switching unit 204b, the transmission path switching factor changing unit 204c, and the ring map updating unit 204d, a function stopping unit 240a and a function restarting unit 240b are provided.
[0055]
The function stopping unit 240a stops the function of the transmission path determining unit 204a in response to a request from the monitoring control devices ws1 to wsm, and the function restarting unit 240b is similarly sent from the monitoring control devices ws1 to wsm. In response to the request, the function of the stopped transmission path determination unit 204a is restarted.
[0056]
FIG. 8 shows the configuration of the monitoring control devices ws1 to wsm according to the present embodiment. The monitoring control devices ws1 to wsm have substantially the same configuration as the monitoring control devices WS1 to WSm, but are different in the configuration of the main control unit.
[0057]
The main control unit 290 is realized by, for example, a microcomputer. In addition to a known communication and control unit that performs information communication with the transmission apparatuses n1 to nm, the function stop request unit 290a and a connection switch switching A request unit 209b, a ring map update request unit 209c, and a function restart request unit 290b are provided.
[0058]
The function stop request unit 290a requests the transmission devices n1 to nm to stop the function of the transmission path determination unit 204a, and the function restart request unit 290b similarly applies to each of the transmission devices n1 to nm. Is requested to restart the function of the transmission path determination unit 204a.
[0059]
Next, a communication path setting process in the information communication system configured as described above will be described with reference to the message sequence diagram of FIG. Here, various controls related to communication path setting are performed for the three transmission devices n1 to n3 from the supervisory control device ws1, and the transmission devices that should actually set the communication path are n2 and n3.
[0060]
In FIG. 9, when the communication path setting work is started, the monitoring control device ws1 sends function stop request signals 504 to 506 to the respective transmission devices n1 to n3 by the function stop request unit 290a. In response to this, each of the transmission devices n1 to n3 returns the response signals 507 to 509 indicating that the stop is completed to the monitoring control device ws1 after the function stop unit 240a stops the function of the transmission path determination unit 204a. To do. The function stop request signals 504 to 506 are realized as, for example, a GET instruction or a CREATE instruction in the CMIP protocol.
[0061]
When the response signals 507 to 509 are received, the monitoring control device ws1 sends the connection switch switching request signals 510 and 511 to the transmission devices n2 and n3 that are to switch the connection switch by the connection switch switching request unit 209a. In response to this, the transmission devices n2 and n3 switch the connection switch by the connection switch switching unit 204b, and return response signals 512 and 513 indicating that the switching of the connection switch has been normally completed to the monitoring control device ws1.
[0062]
If a failure has occurred while the function of the transmission line determination unit 204a is stopped due to a request from the monitoring control device ws1, the transmission line switching factor change unit 204c stores the failure information of the own device and the K1 and K2 bytes. The transmission path switching factor is determined based on the information used and transmitted between the transmission apparatuses, and is stored in the storage unit 205. Next, the transmission path switching factor change unit 204c sequentially compares the determined priority of the transmission path switching factor with the priority of the transmission path switching factor already stored in the storage unit 205 before the determination. The transmission path switching factor change unit 204c sends the transmission path switching factor with the highest priority among the transmission path switching factors stored in the storage unit 205 to the transmission path determination unit 204a. However, since the function of the transmission path determination unit 204a is stopped, the connection switch is not switched without controlling the connection switch switching unit 204b.
[0063]
When the response signals 512 and 513 are received, the supervisory control device ws1 creates a ring map at this time by the ring map update request unit 209c, and transmits the ring map update request signals 514 to 516 including this ring map information to each transmission device. Send to n1 to n3. In response to this, each of the transmission apparatuses n1 to n3 updates the ring map stored in the storage unit 205 by the ring map update unit 204d and sends response signals 517 to 519 indicating that the update has been normally completed. Returned to the monitoring control device ws1.
[0064]
Upon receiving the response signals 517 to 519, the supervisory control device ws1 sends a function restart request signal 520 to 522 to each of the transmission devices n1 to n3 by the function restart request unit 290b. In response to this, each of the transmission apparatuses n1 to n3 restarts the function of the transmission path determination unit 204a by the function restarting unit 240b.
[0065]
When a failure has occurred while the function of the transmission path determination unit 204a is stopped due to a request from the monitoring control device ws1, each of the transmission apparatuses n1 to n3 restarts the function of the transmission path determination unit 204a. Later, the connection switch is switched as necessary based on the transmission path switching factor having the highest priority among the transmission path switching factors stored in the storage unit 205, a new ring map, failure information, and the like. When these controls are completed, each of the transmission apparatuses n1 to n3 returns response signals 523 to 525 indicating that to the monitoring control apparatus ws1.
[0066]
In the above process, information is exchanged between the transmission devices n1 to n3 and the monitoring control device ws1 via the data communication channel (DCC) defined in the section overhead (SOH) of the STM signal.
[0067]
In this way, in the present embodiment, prior to switching of the connection switch from the supervisory control device ws1, function stop request signals 504 to 506 are sent from the supervisory control device ws1 to the transmission devices n1 to n3, and each transmission is performed. The function of the transmission path determination unit 204a in the devices n1 to n3 is stopped.
[0068]
Accordingly, even if a failure occurs during the switching operation of the connection switch from the monitoring control device, the function of the transmission path determination unit 204a is not driven and the connection switch is not switched. In addition, the function of the transmission path determination unit 204a is restarted after updating the ring map in all the transmission apparatuses n1 to n3. For this reason, the connection switches are not switched while the ring maps are different in each of the transmission apparatuses n1 to nm. Therefore, misconnection can be avoided when the connection switch is switched from the monitoring control device.
[0069]
In addition, this invention is not limited to the said embodiment, For example, a network structure is not restricted to a ring shape, Other connection forms may be sufficient.
Further, the configurations of the control units 204 and 240 and the main control units 209 and 290 are not limited to the above example, and it is only necessary that the function of the switching transmission line determination unit 204a of the connection switch can be stopped from the monitoring control device.
In addition, various modifications can be made without departing from the scope of the present invention.
[0070]
【The invention's effect】
As described above in detail, according to the present invention, prior to switching the connection switch, the transmission path switching factor of all transmission apparatuses is the highest priority transmission path with the highest priority among the transmission path switching factors for failure. An information communication system that does not cause misconnection or traffic drop even when the connection switch is switched because it is set as a switching factor or the connection switch switching function at the time of failure is directly stopped. Used in this information communication system It is possible to provide a monitoring control device, a transmission device, and a path setting method.
[Brief description of the drawings]
FIG. 1 is an actual configuration diagram of an information communication system according to an embodiment of the present invention.
FIG. 2 is a functional block diagram showing a main part configuration of transmission apparatuses N1 to Nm according to the first embodiment of the present invention.
FIG. 3 is an ITU-T recommendation G.1. The figure which shows the priority of the switching state defined in 841. FIG.
FIG. 4 is a functional block diagram showing a main configuration of the monitoring control devices WS1 to WSm according to the first embodiment of the present invention.
FIG. 5 is a diagram showing a logical configuration of the information communication system according to the embodiment of the present invention.
FIG. 6 is a message sequence diagram between the monitoring control device WS1 and the transmission devices N1 to N3 according to the first embodiment of the present invention.
FIG. 7 is a functional block diagram showing a main part configuration of transmission apparatuses n1 to nm according to a second embodiment of the present invention.
FIG. 8 is a functional block diagram showing a main part configuration of monitoring control devices ws1 to wsm according to a second embodiment of the present invention.
FIG. 9 is a message sequence diagram between the monitoring control device ws1 and the transmission devices n1 to n3 according to the second embodiment of the present invention.
[Explanation of symbols]
N1 to Nm, n1 to nm ... Transmission device
WS1 to WSm, ws1 to wsm ... monitoring control device
L1-Lm ... LAN
FL ... High speed line
SL ... Low speed line
MNW: Communication management network
201: Add-drop multiplexer (ADM)
202-1 to 202-4 ... High-speed interface unit (HS I / F)
203 ... Low-speed interface unit (LS I / F)
204 ... Control unit
204a ... Transmission path determination unit
204b ... Connection switch switching unit
204c ... Transmission path switching factor changing unit
204d ... Ring map update unit
205: Storage unit
206: Input / output unit
207 Interface unit (I / F)
208: Storage unit
209 ... Main control unit
209a: Setting request part for highest priority switching factor
209b: Connection switch switching request unit
209c ... Ring map update request part
209d: Request for canceling the highest priority switching factor
240 ... control unit
240a ... Function stop part
240b ... Function restarting unit
290 ... Main control unit
290a ... Function stop request section
290b ... Function restart request unit
304 to 306 ... High priority switching factor setting request signal
307 to 309... Response signals for the highest priority switching factor setting request signals 304 to 306
310, 311 ... Connection switch switching request signal
312, 313... Response signals for connection switch switching request signals 310 and 311
314 to 316 ... Ring map update request signal
317 to 319 ... Response signals for the ring map update request signals 314 to 316
320 to 322... Request signal for releasing the highest priority switching factor (Lockout Of Protection Span) state
323 to 325... Response signals for request signals 320 to 322 for canceling the highest priority switching factor state
504 to 506 ... Function stop request signal
507 to 509... Response signals for function stop request signals 504 to 506
510, 511 ... Connection switch switching request signal
512, 513 ... Response signals for connection switch switching request signals 510, 511
514 to 516 ... Ring map update request signal
517 to 519 ... Response signals for ring map update request signals 514 to 516
520-522 ... Function restart request signal
523 to 525... Response signals for function restart request signals 520 to 522

Claims (16)

In an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a backup channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices,
A transmission path switching factor and all transmissions provided in each of the plurality of transmission devices and used to determine the state of the connection switch at the time of the failure in order to recover traffic when the information communication system fails. A transmission path determining means for generating a signal for switching the connection switch based on connection information of a communication path between the devices and a current connection switch state in the own device;
Setting request means provided in the supervisory control device, for all the transmission devices, a setting request means for transmitting a setting request for a transmission path switching factor having the highest priority,
Release request means provided in the supervisory control device, and for all the transmission devices, a release request means for transmitting a release request for a transmission path switching factor having the highest priority,
Switching factor storage means provided in each of the plurality of transmission devices and holding a plurality of transmission path switching factors;
Provided in each of a plurality of transmission devices, according to a setting request signal from the setting request means, set the transmission path switching factor having the highest priority as a transmission path switching factor in the switching factor storage means, In response to the release request signal from the release request means, the transmission path switching factor having the highest priority is deleted from the switching factor storage means, and the transmission held in the switching factor storage means as the transmission path switching factor A switching factor changing means for setting a transmission channel switching factor having the highest priority among the path switching factors;
Provided in the supervisory control device, after the transmission path switching factor used to determine the state of the connection switch is set to the transmission path switching factor having the highest priority, a signal for switching the connection switch Switching request means for transmitting to the transmission device;
An information communication system comprising: a connection switch switching unit that is provided in each of the plurality of transmission devices and switches a connection switch according to the connection switch switching signal. A ring map including connection information of communication paths between all the transmission apparatuses after the connection switch is switched by the connection switch switching means in response to a signal from the switching request means provided in the monitoring control apparatus. Ring map update request means for transmitting to all the transmission devices;
Ring map update means provided in each of the plurality of transmission devices, and further comprising a ring map update means for updating a ring map with a ring map including communication path connection information sent from the ring map update request means,
The transmission path determining means has the highest priority among the transmission path switching factors held in the storage means for holding the transmission path switching factor as the transmission path switching factor used for determining the state of the connection switch. Based on the updated connection information of the communication path, the transmission path switching factor used to determine the state of the connection switch, and the current connection switch state in the own device. 2. The information communication system according to claim 1, wherein a signal for switching the connection switch is generated. In an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a backup channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices,
A transmission path switching factor and all transmissions provided in each of the plurality of transmission devices and used to determine the state of the connection switch at the time of the failure in order to recover traffic when the information communication system fails. A transmission path determining means for generating a signal for switching the connection switch based on connection information of a communication path between the devices and a current connection switch state in the own device;
A function stop requesting means for sending a signal for stopping the function of the transmission path determining means to all the transmission devices provided in the supervisory control device;
Provided in the monitoring control device, for all the transmission devices, a function restart request means for transmitting a signal for releasing the function stop of the transmission path determination means,
A function stopping unit provided in each of the plurality of transmission devices, and stopping a function of the transmission path determining unit in response to the function stop signal;
A function restarting unit that is provided in each of the plurality of transmission devices and that cancels the function stop of the transmission path determination unit in response to the release signal;
A connection switch switching requesting means for transmitting a connection switch switching signal to the plurality of transmission devices after the function of the transmission path determining means is stopped, provided in the monitoring control device;
An information communication system comprising: a connection switch switching unit that is provided in each of the plurality of transmission devices and switches a connection switch according to a switching signal of the connection switch. Provided in the supervisory control device, including connection information of communication paths between all the transmission devices after the connection switch is switched by the connection switch switching unit in response to a switching signal from the connection switch switching request unit A ring map update request means for transmitting a ring map to all the transmission devices;
Ring map update means provided in each of the plurality of transmission devices, and further comprising a ring map update means for updating a ring map with a ring map including communication path connection information sent from the ring map update request means,
The transmission path determination means includes the updated communication path connection information, the transmission path switching factor used to determine the state of the connection switch, and the current connection in the own apparatus after the function stop is released. 4. The information communication system according to claim 3, wherein a signal for switching the connection switch is generated based on the switch state. Use in an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a protection channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices In the monitoring and control device to be
A transmission path switching factor used to determine a state of a connection switch of the transmission apparatus by transmitting a setting request signal of a transmission path switching factor having the highest priority to each of the plurality of transmission apparatuses. A setting request means for setting the transmission path switching factor having the highest priority;
Release request means for transmitting a release request signal of a transmission path switching factor having the highest priority to each of the plurality of transmission devices;
After the transmission path switching factor used to determine the state of the connection switch of the transmission apparatus is set to the transmission path switching factor having the highest priority, a signal for switching the connection switch is transmitted to the plurality of transmission apparatuses. And a connection switch switching requesting means for switching connection switches of the plurality of transmission devices.   After a connection switch of the transmission device is switched in response to a signal from the connection switch switching request means, a ring map including connection information of communication paths between all the transmission devices is transmitted to all the transmission devices. 6. The monitoring control apparatus according to claim 5, further comprising a ring map update means for updating ring maps of all the transmission apparatuses. Use in an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a protection channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices In the monitoring and control device to be
Transmission path switching factor used to determine the state of a connection switch at the time of the failure in order to recover the traffic when a failure occurs in the information communication system, connection information of communication paths between all transmission devices, and within the own device Automatic switching function stop request means for transmitting a signal for stopping the automatic switching function for generating a signal for switching the connection switch based on the current connection switch state to all the transmission devices;
Automatic switching function restart request means for transmitting a signal for canceling the automatic switching function stop for all the transmission devices;
A monitoring control device comprising connection switch switching requesting means for transmitting a connection switch switching signal to the plurality of transmission devices after the automatic switching function is stopped to switch the connection switches of the plurality of transmission devices.   After the connection switches of the plurality of transmission apparatuses are switched in response to a switching signal from the connection switch switching request means, a ring map including connection information of communication paths between all the transmission apparatuses is displayed on all the transmission apparatuses. The monitoring control device according to claim 7, further comprising: a ring map updating unit that transmits to the network and updates a ring map of all the transmission devices. A plurality of transmission devices connected via a transmission line having a working channel and a protection channel, and having an automatic switching function for recovering traffic by switching the state of a connection switch when a failure occurs, and In a transmission device used in an information communication system comprising at least one monitoring control device for monitoring and controlling
In order to recover traffic when a failure occurs in the information communication system, transmission path switching factors used to determine the state of the connection switch at the time of the failure, connection information of communication paths between all transmission devices, and the own device A transmission path determining means for generating a signal for switching the connection switch based on the current connection switch state in
Switching factor storage means for holding a plurality of transmission path switching factors;
In response to the setting request signal of the transmission path switching factor having the highest priority from the monitoring and control apparatus, the transmission path switching factor having the highest priority is set as the transmission path switching factor in the switching factor storage unit. In response to the cancellation request signal of the transmission path switching factor having the highest priority from the supervisory control device, the transmission path switching factor having the highest priority is deleted from the switching factor storage means, and the transmission path switching factor As a transmission path switching factor changing means for setting a transmission path switching factor having the highest priority among the transmission path switching factors held in the switching factor storage means,
Connection switch switching means for switching the connection switch according to a signal for switching the connection switch,
The connection switch switching means switches the connection switch according to a signal for switching the connection switch sent from the monitoring control device after the transmission path switching factor is set to the transmission path switching factor having the highest priority. . Ring map update means for updating a ring map including connection information of communication paths between all the transmission devices sent from the monitoring and control device after the connection switch is switched by the connection switch switching device. ,
The transmission path determination means is updated after the transmission path switching factor having the highest priority among the transmission path switching factors held in the switching factor storage means is set as the transmission path switching factor. 10. The transmission apparatus according to claim 9, wherein a signal for switching the connection switch is generated based on connection information of the communication path, the transmission path switching factor, and a current connection switch state in the own apparatus. Use in an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a protection channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices Transmission equipment,
In order to recover traffic when a failure occurs in the information communication system, transmission path switching factors used to determine the state of the connection switch at the time of the failure, connection information of communication paths between all transmission devices, and the own device A signal for switching the connection switch based on the current connection switch state, stopping the function by the function stop signal from the monitoring control device, and releasing the function stop by the release signal from the monitoring control device Route determination means;
Connection switch switching means for switching the connection switch according to the switching signal,
The connection switch switching unit is a transmission device that switches a connection switch in accordance with a switching signal sent from the monitoring control device after the function of the transmission path determination unit is stopped. A ring map update unit for updating a ring map including connection information of communication paths between all the transmission devices sent from the monitoring control device after the connection switch is switched by the connection switch switching unit;
The transmission path determination means includes the updated communication path connection information, the transmission path switching factor used to determine the state of the connection switch, and the current connection in the own apparatus after the function stop is released. 12. The transmission apparatus according to claim 11, wherein a signal for switching the connection switch is generated based on the switch state. A plurality of transmission devices that are connected via a transmission line having a working channel and a protection channel and have a function of recovering traffic by switching the state of a connection switch when a failure occurs, and monitoring each of the transmission line and the plurality of transmission devices A path setting method in an information communication system comprising at least one supervisory control device to control,
When setting the communication path from the supervisory control device, transmitting a setting request signal for a transmission path switching factor having the highest priority to all the transmission devices;
Each of all the transmission devices has the highest priority in the switching factor storage means that holds the transmission path switching factor used for determining the state of the connection switch in response to the setting request signal from the monitoring control device. Setting a transmission path switching factor having a degree;
Each of the plurality of transmission devices, after being set as a transmission path switching factor having the highest priority, switching a connection switch according to a path setting signal from the monitoring and control device;
The supervisory control device transmits a release request signal for a transmission path switching factor having the highest priority to all the transmission devices;
In response to a release request signal from the monitoring control device, the transmission path switching factor having the highest priority is deleted from the switching factor storage means, and is retained in the switching factor storage means as a transmission path switching factor. A path setting method including a step of setting a transmission path switching factor having the highest priority among the transmission path switching factors. After a connection switch is switched in response to a signal from the supervisory control device, a step of transmitting a ring map including connection information of communication paths between the plurality of transmission devices from the supervisory control device to all the transmission devices When,
Updating the ring map of the transmission device with a ring map including communication path connection information transmitted from the supervisory control device;
After the transmission path switching factor having the highest priority among the transmission path switching factors held in the switching factor storage means is set as the transmission path switching factor, the updated communication path connection information, The path setting method according to claim 13, further comprising: switching a connection switch based on a transmission path switching factor used for determining a state of the connection switch and failure information. Path setting in an information communication system comprising a plurality of transmission devices connected via a transmission line having a working channel and a protection channel, and at least one monitoring control device for monitoring and controlling each of the transmission line and the plurality of transmission devices A method,
When setting a communication path from the supervisory control device, the state of the connection switch at the time of the failure is determined in order to recover the traffic when the failure of the information communication system occurs for all the transmission devices. Transmitting a signal for stopping an automatic switching function for switching a connection switch based on a transmission path switching factor to be used, connection information of communication paths between all transmission devices, and a current connection switch state in the own device; ,
After the automatic switching function is stopped, switching the connection switch according to the communication path setting operation from the monitoring control device;
A path setting method including a step of transmitting a signal for canceling the suspension of the automatic switching function to all the transmission apparatuses from the monitoring control apparatus after the connection switch is switched by the control from the monitoring control apparatus. After the connection switch is switched in response to a switching signal from the supervisory control device, a ring map of the transmission device by a ring map including connection information of communication paths between all the transmission devices from the supervisory control device A step of updating
After the suspension of the automatic switching function is released, based on the updated connection information of the communication path, the transmission path switching factor used to determine the state of the connection switch, and the current connection switch state of the own device The path setting method according to claim 15, further comprising a step of switching connection switches.

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