JP2014217029A - Communication system management device and communication system management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine influence on communication connectivity in a communication system by a fault of a facility constituting part of the communication system.SOLUTION: A communication system management device comprises: a facility information storage unit that stores utilization information indicating the utilization state of each of a plurality of facilities constituting a plurality of communication paths in a communication system that performs data transmission and reception between places using the plurality of communication paths, and dependence information indicating dependence relation related to a fault among the facilities; a communication demand storage unit that pre-stores a communication path number required for maintaining data transmission and reception in the communication system; and a faulty communication path number management unit that calculates a faulty communication path number, which is the number of communication paths that cannot continue data transmission and reception among the plurality of communication paths per facility when the facility becomes faulty on the basis of the utilization information and the dependence information, and determines whether the communication path number required when the facility becomes faulty can be maintained or not.

Description

  The present invention relates to a communication system management apparatus and a communication system management for determining the possibility of communication disconnection in a communication system due to equipment failure based on the state of the equipment constituting the communication system that performs communication using a plurality of communication paths. Regarding the method.

  In the current backbone network, in order to improve the reliability of communication against failures caused by failure of a transmitter / receiver as a transmission device or disconnection of an optical fiber, a protection technology for continuing data transmission / reception between the ground is introduced. . As an example of the protection technique, multiplexing is performed by transmitting the same signal using a plurality of communication paths and a plurality of transceivers. By performing such multiplexing, data transmission / reception can be continued even when any communication path or any transceiver fails. In such protection technology, it is common to provide a redundant standby communication path that is redundant with respect to the working communication path so as not to overlap the working communication path (Non-patent Document 1).

  In recent years, in order to further improve the reliability of data transmission / reception, a method of restoring data lost due to equipment failure using an erasure correction code has been proposed (Non-Patent Document 2). In this method, data to which an erasure correction code is assigned at a transmission source is distributed and transmitted to a plurality of communication paths or a plurality of transceivers. A method of improving fault tolerance in data transmission / reception between ground by restoring data that could not be received with erasure correction codes even if reception failed due to equipment failure in some of the multiple communication paths It is. In this method, it is preferable to perform transmission / reception of data using a larger number of communication paths because of the need to increase the encoding efficiency. Of a plurality of communication channels, data can be restored for up to a certain number of channel failures depending on the coding characteristics defined by the erasure correction code. However, if the number of failures exceeds a certain number, data restoration becomes impossible. .

Jane M. Simmons, "Optical Network Design and Planning", Springer, 2008, p.186 Akira Hirano, "Design Plasticity in Elastic Optical Network For Unpredictable Traffic," Mo.1.D.5, ECOC 2012

  As described above, it has been studied to use a plurality of communication paths in order to obtain tolerance against failure of equipment used in the communication system. However, in order to obtain high tolerance against failures and high reliability, it is desirable that a plurality of communication channels are independent of failures, that is, the number of communication channels that pass through a certain facility is as small as possible. For example, in general, many optical fibers are bundled and accommodated in a pipeline, but if the pipeline is cut due to a disaster or the like, all the optical fibers accommodated in the pipeline are damaged. End up. A set in which such a single failure affects a plurality of facilities is generally referred to as SRLG (Shared Risk Link Group).

  In order to obtain high reliability, it is desirable to set a plurality of communication paths using optical fibers housed in different pipes in consideration of SRLG. However, it is often difficult for a general network to prevent a plurality of communication paths from mutually avoiding SRLG. In a network design using a plurality of communication paths, SRLG is highly likely to occur even if the reliability is improved by using two paths of an active communication path and a backup communication path.

  In order to avoid SRLG, a plurality of non-overlapping communication paths are required between all grounds. However, in a ring network, there are only two communication paths that satisfy such a condition. When more communication paths are used, the occurrence of SRLG cannot be avoided. In addition, even if there are multiple communication paths that do not overlap in other network topologies, there are many cases where some of the communication paths are largely detoured, which is not practical as an appropriate communication path. There are many. For this reason, it is realistic to understand the impact on communication connectivity due to failure of individual equipment that constitutes the communication system, and to manage the range of the impact appropriately, on the premise of the occurrence of SRLG to some extent. is there.

  Further, in the method using the above-described erasure correction code, there is a possibility that communication is disconnected without restoring data due to simultaneous disconnection of a plurality of communication paths. In order to reduce such a possibility, a function for determining whether or not there is a possibility that communication of the communication system may be disconnected due to equipment failure or the like is required. However, communication systems that perform data transmission and reception between the ground are often implemented with a simple function that switches between the current communication path and the backup communication path, and associates the failure of equipment with the connectivity of communication. That was not done. That is, when a failure of a certain facility occurs, processing for determining whether or not communication of a client performing communication using the facility is correctly performed has not been performed.

  In view of the above circumstances, an object of the present invention is to provide a communication system management apparatus and a communication system management method capable of determining the influence of a failure of equipment constituting a communication system on communication connectivity in the communication system. It is said.

  One aspect of the present invention is a communication system that performs transmission / reception of data between the ground using a plurality of communication paths, operation information indicating an operation state of each of the plurality of facilities constituting the plurality of communication paths, and between the facilities For each piece of equipment, a facility information storage unit that stores dependency information indicating a dependency relationship related to a failure, a communication demand storage unit that stores in advance the number of communication paths necessary for maintaining transmission and reception of data in the communication system, Calculate the number of failed communication paths, which is the number of communication paths that cannot continue to transmit and receive data among the plurality of communication paths when the equipment breaks down based on the operation information and the dependency information, and the necessary when the equipment breaks down And a failure communication path number management unit that determines whether or not the number of communication paths can be maintained.

  Further, according to one aspect of the present invention, in the communication system management device described above, when a failure occurs in any of the plurality of facilities, the number of failed communication paths corresponding to the facility in which the failure has occurred and the necessary The communication system further includes a connectivity management unit that determines whether data transmission / reception can be maintained based on the number of communication paths.

  Further, according to one aspect of the present invention, in the communication system management device described above, when a failure occurs in any of the plurality of facilities, the information indicating the facility in which the failure has occurred and the dependency information are used. A communication facility management unit that updates the operation information, and the failure communication path number management unit updates the number of failure communication paths of each of the plurality of facilities after the operation information is updated, and the connectivity management The unit may not be able to maintain data transmission / reception in the communication system based on the number of faulty communication paths of the plurality of facilities calculated by the faulty communication path number management unit and the required number of communication paths. The information which shows is output.

  Further, according to one aspect of the present invention, in the communication system management device described above, the plurality of facilities are classified based on the dependency relationship, and the connectivity management unit includes a facility group for each of the classified facilities. The maximum number of faulty communication channels is calculated, and the required communication channel is calculated based on the number of operating communication channels out of the plurality of communication channels and the maximum number of faulty communication channels. The determination result of whether or not the number can be maintained is output for each facility group.

  Further, according to one aspect of the present invention, in the communication system management device described above, the communication demand storage unit stores data in the communication system even when a failure occurs for each facility classified in the facility group. Priority class information that determines whether or not it is necessary to maintain transmission / reception is further stored, and the connectivity management unit includes the number of active communication paths among the plurality of communication paths and the maximum failure communication. Based on the number of roads, it is determined whether or not the reliability defined in the priority class information can be satisfied. When it is determined that the reliability cannot be satisfied, it is determined in the priority class information that a failure occurs in any equipment group. It is characterized in that information indicating whether the given reliability cannot be satisfied is output.

  Further, according to one aspect of the present invention, in a communication system that performs transmission / reception of data between the ground using a plurality of communication paths, operation information indicating an operation state of each of the plurality of facilities configuring the plurality of communication paths, and the facilities Communication system management comprising: an equipment information storage unit that stores dependency information indicating a dependency relationship between failures, and a communication demand storage unit that stores in advance the number of communication paths necessary to maintain data transmission / reception in the communication system In the communication system management method performed by the apparatus, for each facility, when the facility fails based on the operation information and the dependency information, the number of communication channels that cannot continue to transmit and receive data among the plurality of communication channels. It has a fault communication path number management step for calculating a certain fault communication path number and determining whether or not the necessary communication path number can be maintained when a facility fails. A communication system management method according to claim and.

  According to the present invention, for each piece of equipment that constitutes a communication system, the number of communication paths that are affected when a failure occurs in the equipment is calculated, and the communication system can continue to transmit and receive data when the equipment fails. By determining whether or not, it is possible to grasp the influence of failure of each facility on communication connectivity.

It is a block diagram which shows the structure of the communication system management apparatus 1 in 1st Embodiment. It is the schematic which shows an example of the communication system which the communication system management apparatus 1 manages in the embodiment, and its installation. It is a figure which shows an example of the accommodation communication path information and accommodation optical fiber information which the equipment information storage part 11 in the embodiment memorize | stores. It is a figure which shows an example of the communication demand information which the communication demand memory | storage part 13 in the embodiment memorize | stores. It is a figure which shows an example of the failure communication path number information which the failure communication path number storage part 16 in the embodiment memorize | stores. It is a block diagram which shows the structure of the communication system management apparatus 2 in 2nd Embodiment. It is a figure which shows an example of the change of connectivity information when a failure generate | occur | produces in the installation of the communication system shown in FIG. It is a figure which shows the change of the danger level of the communication interruption | blocking corresponding to the connectivity information shown in FIG. It is a flowchart which shows the information update process which the communication system management apparatus 2 in the embodiment performs. It is a figure which shows an example of the priority class information in 3rd Embodiment.

  Hereinafter, a communication system management apparatus and a communication system management method according to an embodiment of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram illustrating a configuration of a communication system management apparatus 1 according to the first embodiment. The communication system management apparatus 1 is an apparatus that calculates an influence of a failure of equipment constituting a communication system that transmits and receives data between communication bases (between grounds) on communication connectivity in the communication system. The communication system is configured using, for example, a transmitter / receiver installed in a node serving as a communication base, an optical fiber as a medium for transmitting data, a pipe line for accommodating the optical fiber, and the like. The equipment that is managed by the communication system management apparatus 1 is a part or all of these transceivers, optical fibers, and pipelines. Communication connectivity means that a client on the ground in the communication system can correctly transmit and receive data. For example, in a communication system having a plurality of communication paths, communication can be secured if data can be transmitted and received normally on other communication paths even if a failure occurs in some of the communication paths. Will be.

  Here, an example of the communication system comprised by the equipment which the communication system management apparatus 1 manages and the said equipment is shown. FIG. 2 is a schematic diagram illustrating an example of a communication system and its facilities that are managed by the communication system management apparatus 1 in the present embodiment. The communication system performs data transmission / reception between the node a and the node c. In the communication system, six transceivers d to i are located at the node a, and six transceivers d 'to i' are located at the node c. Between the node a and the node b, the pipe line p which accommodates the optical fibers j and k is installed. A pipe line q that accommodates the optical fibers n and o is installed between the node b and the node c. Between the node c and the node a, the pipe line r which accommodates the optical fibers l and m is installed.

Communication paths are set between the transceiver d and the transceiver d ′ and between the transceiver e and the transceiver e ′. The communication path is accommodated in the optical fiber j and the optical fiber n, and the node a and the node c are communicably connected via the node b.
A communication path is set between the transmitter / receiver f and the transmitter / receiver f ′. The communication path is accommodated in the optical fiber k and the optical fiber o, and is connected between the node a and the node c via the node b. Are communicably connected.

Communication paths are set between the transceiver g and the transceiver g ′ and between the transceiver h and the transceiver h ′. The communication path is accommodated in the optical fiber l and connects the node a and the node c so that they can communicate with each other.
A communication path is set between the transceiver i and the transceiver i ′. The communication path is accommodated in the optical fiber m and connects the node a and the node c so that they can communicate with each other.

  Hereinafter, a communication path between the transmitter / receiver d and the transmitter / receiver d 'is referred to as a communication path d-d'. Similarly, the other communication paths are referred to as communication paths f-f '. The equipment in the communication system shown in FIG. 2 includes transceivers d to i and transceivers d 'to i', optical fibers j to m, and pipes p to r. The number of communication paths is represented by the number of transmitter / receiver pairs between the ground (between node a and node c), and the number of communication paths in the communication system shown in FIG. 2 is six.

  Each optical fiber accommodates one or more communication paths, and each conduit accommodates one or more optical fibers. A failure in an optical fiber means a disconnection of a communication path accommodated in the optical fiber. Further, a failure in a pipeline means that all the communication paths of the optical fiber accommodated in the pipeline are disconnected. For example, the failure of the optical fiber j causes a failure of the communication channel d-d 'and the communication channel e-e'. The failure of the pipe line q causes a failure of the optical fiber n and the optical fiber o, and a failure of the communication channel d-d ', the communication channel e-e', and the communication channel f-f '. That is, in response to the dependency relationship (accommodation relationship) of facilities constituting the communication system, a failure occurring in one facility causes a failure in another facility.

Returning to FIG. 1, the description of the configuration of the communication system management apparatus 1 will be continued.
As shown in FIG. 1, the communication system management apparatus according to the present embodiment includes an equipment information storage unit 11, a communication equipment management unit 12, a communication demand storage unit 13, a communication demand management unit 14, a faulty communication path number management unit 15, and The fault communication channel number storage unit 16 is provided.

  The facility information storage unit 11 stores operation information indicating the operation state of each facility constituting the communication system, and accommodation communication path information and accommodation optical fiber information indicating a dependency relationship (accommodation relationship) regarding a failure of each facility. ing. The operation information is information indicating whether the facility is operating or malfunctioning for each facility constituting the communication system. The accommodation communication path information is information indicating an optical fiber accommodating the communication path for each communication path provided in the communication system. The accommodation optical fiber information is information indicating a pipeline that accommodates the optical fiber for each optical fiber provided in the communication system.

  In other words, the accommodated communication path information and the accommodated optical fiber information are information indicating a dependency relationship regarding a failure between facilities, and are information indicating a relationship in which other facilities can simultaneously fail due to a failure of a certain facility. The accommodation communication path information and the accommodation optical fiber information are stored in advance in the facility information storage unit 11 by the operation of the administrator or maintenance person of the communication system. In addition, the operation information is determined by an initial operation state of each facility by receiving an operation by an administrator or a maintenance person of the communication system or an output from a device that detects the operation state of each facility.

  The communication facility management unit 12 manages the operation information, accommodation communication path information, and accommodation optical fiber information stored in the facility information storage unit 11. Specifically, the communication facility management unit 12 reads information from the facility information storage unit 11 in response to a request from the failure communication path number management unit 15, and outputs the read information to the failure communication path number management unit 15. Further, the communication facility management unit 12 updates the information stored in the facility information storage unit 11.

The communication demand storage unit 13 stores communication demand information. Communication demand information includes information indicating the transmission / reception ground, information indicating the number of communication paths operating between the grounds (number of active communication paths), and the number of communication paths required for communication between the grounds (request communication). Information indicating the number of roads). The communication demand information may include information that is individually required when a client between the grounds performs communication in the communication system.
The communication demand management unit 14 manages communication demand information stored in the communication demand storage unit 13. Specifically, the communication demand management unit 14 reads information stored in the communication demand storage unit 13 and outputs the information to the failure communication channel number management unit 15 in response to a request from the failure communication channel number management unit 15.

The fault communication channel number management unit 15 generates fault communication channel number information based on each information read out via the communication facility management unit 12 and the communication demand management unit 14. The fault communication channel number management unit 15 stores the generated fault communication channel number information in the fault communication channel number storage unit 16. As for the number of faulty communication channels, the number of communication channels that cannot continue to transmit and receive data when a failure occurs in a facility, that is, the number of faulty communication channels indicating the number of communication channels in which a failure occurs is associated with each facility. Information.
The fault communication channel number storage unit 16 stores fault communication channel number information.

  Here, an example of each piece of information stored in the facility information storage unit 11 and the communication demand storage unit 13 will be shown by taking the communication system shown in FIG. 2 as an example. FIG. 3 is a diagram illustrating an example of accommodation communication path information and accommodation optical fiber information stored in the facility information storage unit 11 according to the present embodiment. FIG. 3A is a diagram illustrating an example of accommodation communication path information. In the accommodation communication path information, information (identifier) indicating an optical fiber that accommodates the communication path is associated with each piece of information indicating a communication path of a set of transceivers. For example, information “d-d ′” indicating the transceiver d-d ′ (communication path d-d ′) is associated with “j, n” indicating the optical fiber j and the optical fiber n.

  FIG. 3B is a diagram illustrating an example of accommodated optical fiber information. In the accommodated optical fiber information, information (identifier) indicating a pipeline that accommodates the optical fiber is associated with information indicating the optical fiber. For example, the information “l” indicating the optical fiber l is associated with “r” indicating the pipe line r. That is, the facility information storage unit 11 stores information indicating the configuration of the communication system.

  By mutually referring to the accommodation communication path information and the accommodation optical fiber information stored in the facility information storage unit 11, it is possible to grasp the accommodation relationship of all the facilities in the communication system. For example, when detecting a communication path included in the pipeline p, the communication facility management unit 12 reads an optical fiber associated with the pipeline p in the accommodated optical fiber information stored in the facility information storage unit 11. . In this case, as shown in FIG. 3, since the optical fiber j and the optical fiber k are associated with the pipe line p, the optical fibers j and k are detected. Next, the communication equipment management unit 12 reads out the communication path associated with the detected optical fibers j and k in the accommodation communication path information stored in the equipment information storage unit 11. In this case, as shown in FIG. 3, the communication path dd ′ and the communication path ee ′ are associated with the optical fiber j, and the communication path ff ′ is associated with the optical fiber k. Therefore, the communication channels dd ′, ee ′, and ff ′ are detected.

  By detecting the accommodation relationship in this manner, for example, when a failure occurs in the pipeline p, the optical fibers j and k and the communication channels dd ′, ee ′, and ff ′ (transmitter / receiver d, d ′, e, e ′, f, f ′) can be grasped. In this way, it is possible to grasp which equipment is affected by the failure of each equipment. Here, taking the communication system shown in FIG. 3 as an example, the accommodation relationship (dependency in failure) of the transmitter / receiver, the set of transmitter / receiver (communication path), the optical fiber, and the pipeline is shown. However, when the communication system includes other devices and facilities, information indicating the accommodation relationship with the devices or facilities or the dependency relationship in failure may be stored in the facility information storage unit 11. Good. In that case, the communication equipment management unit 12 detects the accommodation relationship between equipment and devices by sequentially reading the information stored in the equipment information storage unit 11 as described above. become.

  FIG. 4 is a diagram illustrating an example of communication demand information stored in the communication demand storage unit 13 according to the present embodiment. As shown in the figure, in the communication demand information, the number of active communication channels “6” and the number of requested communication channels “1” are associated with “ac” indicating a set of node a and node c. It has been. As for the number of operating communication channels, for example, the communication demand management unit 14 acquires the number of transmitter / receiver sets (communication channels) stored in the accommodated communication channel information and the operating information via the communication facility management unit 12. Is set by Further, the required number of communication channels is determined in advance according to the target communication system.

  FIG. 5 is a diagram illustrating an example of the failure communication path number information stored in the failure communication path number storage unit 16 according to the present embodiment. Here, the number of faulty communication channels is shown by classifying the same type of equipment group (pipe, optical fiber, transceiver) provided in the communication system. Facilities are classified based on their characteristics, functions, or accommodation or dependency between facilities. In the present embodiment, each facility is classified into a facility group based on the accommodation relation of the facility. FIG. 5A shows the number of faulty communication paths for each pipeline. The number of failed communication channels “3” is associated with the pipelines p, q, and r. FIG. 5B shows the number of faulty communication paths for each optical fiber. The number of failed communication paths “2” is associated with the optical fibers j, l, and n, and the number of failed communication paths “1” is associated with the optical fibers k, m, and o. FIG. 5C shows the number of faulty communication paths for each transceiver. The number of failed communication paths “1” is associated with the transceivers d to i and the transceivers d ′ to i ′.

  Here, a procedure in which the failed communication path number management unit 15 generates the failed communication path number information illustrated in FIG. 5 will be described. Based on the information stored in the facility information storage unit 11, the fault communication channel number management unit 15 is the number of communication channels that cause communication interruption when the facility fails for each facility constituting the communication system. Calculate the number of faulty communication channels. The fault communication path number management unit 15 stores the calculated fault communication path number in the fault communication path number storage unit 16 in association with the equipment.

  The fault communication path number management unit 15 requests the communication facility management unit 12 for information indicating facilities provided in the communication system. The fault communication path number management unit 15 acquires information indicating each facility (transmitter / receiver, optical fiber, and pipeline) provided in the communication system from the communication facility management unit 12. The information indicating each facility is information read from the facility information storage unit 11 by the communication facility management unit 12.

  For each piece of information indicating each acquired facility, the failure communication path number management unit 15 transmits information indicating a communication path accommodated by the facility indicated by the information or a communication path depending on the facility to the communication facility management unit. 12 to request. As described above, the communication facility management unit 12 sequentially reads information stored in the facility information storage unit 11 using information indicating the facility as a key, and detects a communication path accommodated in the facility.

  For example, when the communication facility manager 12 requests information indicating the communication path accommodated in the pipeline p from the failed communication path number manager 15, the communication paths dd ', ee', f- Information indicating f ′ is output to the fault communication path number management unit 15. The failure communication path number management unit 15 sets the number of failure communication paths of the pipeline p to 3 from the information indicating the communication paths dd ′, ee ′, and ff ′ acquired corresponding to the pipeline p. calculate. In addition, when the communication facility management unit 12 requests the information indicating the communication path accommodated in the transmitter / receiver h from the failed communication path number management unit 15, the communication facility management unit 12 indicates information indicating the communication path hh ′ including the transmitter / receiver h. Is output to the fault communication path number management unit 15. The fault communication path number management unit 15 calculates the fault communication path number of the transmitter / receiver h as 1 from the information indicating the communication path h-h ′ acquired corresponding to the transmitter / receiver h.

  Thus, the fault communication path number management unit 15 calculates the fault communication path number for each facility provided in the communication system, and stores the calculated fault communication path number in the fault communication path number storage unit 16. By referring to the number of faulty communication paths stored in the faulty communication path number storage unit 16, it is possible to calculate the number of faulty communication paths when a failure occurs in equipment provided in the communication system. it can.

  For example, as shown in FIG. 5, when the number of active communication paths between the node a and the node c is 6 and the number of requested communication paths is 1, that is, the communication system is connected to the currently used communication path. In the case of having five spare communication channels, it can be seen that at least three communication channels can be operated even if a failure occurs in any of the facilities of the communication system. Further, when information indicating that a failure has occurred in the optical fiber j is input to the communication system management apparatus 1, the fault communication path number management unit 15 sets the fault communication path number “2” corresponding to the optical fiber j to the fault communication. Read from the road number storage unit 16. Also, the fault communication channel number management unit 15 acquires communication demand information via the communication demand management unit 14. The failure communication channel number management unit 15 determines that the current operation communication channel number is “4” from the operation communication channel number “6” included in the communication demand information and the read failure communication channel number “2”. calculate. Further, the failure communication path number management unit 15 determines that the connectivity of the communication can be maintained because the calculated current operation communication path number “4” is equal to or greater than the requested communication path number included in the communication demand information. The judgment result is output to the outside. The ability to maintain communication connectivity means that communication disconnection does not occur between node a and node c in this example.

As described above, the communication system management apparatus 1 according to the present embodiment manages the number of communication paths that can cause a failure for each facility that configures the communication system, so that a failure in a facility that accommodates a plurality of communication paths can be communicated. It is possible to calculate the magnitude of the influence on connectivity. Moreover, in the communication system management apparatus 1 according to the present embodiment, the number of failed communication paths is calculated based on the accommodated communication path information and the accommodated optical fiber information indicating dependency relations regarding failures between facilities in the facility information storage unit 11. Thereby, the communication system management apparatus 1 can calculate the influence of the equipment failure on the communication connectivity in consideration of SRLG.
Note that the communication system management apparatus 1 according to the present embodiment is applicable to any communication system that transfers data using a plurality of communication paths.

<Second Embodiment>
FIG. 6 is a block diagram illustrating a configuration of the communication system management device 2 according to the second embodiment. The communication system management apparatus 2 includes a facility information storage unit 11, a communication facility management unit 12, a communication demand storage unit 13, a communication demand management unit 14, a failed communication path number management unit 15, a failed communication path number storage unit 16, and a connectivity management. Unit 27 and connectivity information storage unit 28. The communication system management apparatus 2 in the present embodiment further includes a connectivity management unit 27 and a connectivity information storage unit 28 in addition to the configuration of the communication system management apparatus 1 (FIG. 1) in the first embodiment. Yes.

  The communication demand information stored in the communication demand storage unit 13 includes the minimum number of operating communication paths instead of the requested number of communication paths. The minimum number of communication channels is the minimum number of channels required for maintaining communication connectivity in the communication system. In other words, in the communication system shown in FIG. 2, the number of communication paths is necessary to prevent communication interruption between the node a and the node c. In the communication system shown in FIG. 2, the minimum number of operating communication channels is 3 if at least 3 communication channels out of 6 communication channels between node a and node c are operating. , Indicates that communication between the node a and the node c is possible. This is equivalent to correctly correcting a failure of up to 3 communication paths out of 6 communication paths when the erasure correction code described above is used in the communication system. When N: 1 protection technology is used, the minimum number of operating communication channels is 1 when the number of communication channels is N. That is, the minimum number of operating communication channels is the minimum number of communication channels that can maintain communication connectivity between the ground.

The connectivity management unit 27 calculates connectivity information based on the communication demand information stored in the communication demand storage unit 13 and the number of faulty communication paths stored in the fault communication path number storage unit 16. The connectivity management unit 27 stores the calculated connectivity information in the connectivity information storage unit 28. In addition, the connectivity management unit 27 outputs the calculated connectivity information to the outside. In addition, when the connectivity management unit 27 acquires failure information indicating that a failure has occurred in the facility, the connectivity management unit 27 updates the connectivity information.
The connectivity information storage unit 28 stores the connectivity information calculated by the connectivity management unit 27.

  The connectivity information includes the number of operating communication paths and the maximum number of failed communication paths for each of the same type of equipment provided in the communication system. The number of active communication paths is the number of communication paths in which no failure has occurred among the communication paths set in the communication system. The maximum number of faulty communication channels is the maximum number of faulty communication channels among the number of faulty communication channels in the same type of equipment (transmitter / receiver, optical fiber, and pipe). The maximum number of failed communication paths is uniquely calculated for each communication demand including a plurality of communication paths or between communication bases.

  For example, if no failure has occurred in any of the facilities in the communication system shown in FIG. 2, the connectivity management unit 27 determines the number of transmitter / receiver sets (communication paths) via the communication facility management unit 12. The number of communication channels “6” acquired from the facility information storage unit 11 is calculated as the number of active communication channels. In addition, the connectivity management unit 27 reads the combination of the facility stored in the fault communication path number storage unit 16 and the number of fault communication paths of the facility, and sets the maximum fault communication path number for each type of equipment to the maximum fault. Calculated as the number of communication channels.

  In the pipelines p to r, since the number of faulty communication channels of any pipeline is “3”, the maximum number of faulty communication channels of the pipeline is “3”. In the optical fibers j to o, the number of failed communication channels “2” of the optical fibers j, l, and n is the maximum, and the maximum number of failed communication channels of the optical fiber is “2”. In the transceivers d to i and the transceivers d 'to i', the number of faulty communication channels of any of the transceivers is "1", so the maximum number of faulty communication channels of the transceiver is "1". That is, the connectivity information between the node a and the node c calculated in this case is the number of active communication channels “6”, the maximum number of failed communication channels “(pipe, optical fiber, transceiver) = (3, 2, 1) ".

  Here, in the communication system shown in FIG. 2, the process of updating the connectivity information when a failure occurs in the order of the transceiver e, the pipe q, and the optical fiber m will be described with reference to FIGS. 7 and 8. . FIG. 7 is a diagram showing a change in connectivity information when a failure occurs in the equipment of the communication system shown in FIG. FIG. 8 is a diagram illustrating an example of a change in the risk of communication interruption corresponding to the connectivity information illustrated in FIG. 7. FIG. 7A shows connectivity information before a failure occurs in the communication system (initial state). In the connectivity information, the number of active communication channels is 6, and the maximum number of failed communication channels is (3, 2, 1) for (pipe, optical fiber, transceiver).

  FIG. 8A is a schematic diagram showing the state of the communication system based on the connectivity information shown in FIG. In FIG. 8, six blocks uz indicate that the number of communication paths between the node a and the node c is six. In the initial state, since there is no failure, the number of active communication paths is six. A mark (open triangle (Δ)) indicating the number of active communication channels is mapped on the right side of the block z.

  In addition, facility names are mapped on the blocks according to the maximum number of failed communication paths that each facility can take. This indicates that a single failure of each facility may cause a communication path failure at the maximum number of blocks on the right side including the block to which the facility name is mapped. On the right side of the block w (between the block w and the block x), a mark indicating the minimum number of operating communication channels (filled triangle mark (▲)) is mapped.

  Further, the three blocks u to w marked “OK” indicate that at least three communication paths can be operated even if any of the facilities fails next time. Therefore, in the state shown in FIG. 8A, it can be seen that communication connectivity can be maintained even if a failure occurs in any of the facilities provided in the communication system.

  FIG. 7B shows connectivity information when a failure occurs in the transceiver e in the initial state. When accepting failure information indicating that a failure has occurred in the transmitter / receiver e from the outside, the connectivity management unit 27 requests the number of failed communication channels of the transmitter / receiver e from the failed communication channel number management unit 15, and determines the number of failed communication channels. “1” is acquired. The connectivity management unit 27 updates the number of active communication channels “6” included in the connectivity information to “5” based on the acquired number of failed communication channels “1”.

  In addition, the connectivity management unit 27 requests the communication facility management unit 12 to update the operation information stored in the facility information storage unit 11 to reflect that the transmitter / receiver e is out of order. Further, the connectivity management unit 27 requests the communication demand management unit 14 to update the communication demand information stored in the communication demand storage unit 13 to reflect that the number of active communication channels has been updated to “5”. To do. The connectivity management unit 27 requests the failure communication path number management unit 15 to update the number of failed communication paths accompanying the update of the operation information.

  In response to a request from the connectivity management unit 27, the fault communication channel number management unit 15 provides information indicating the communication path accommodated in the facility for each facility provided in the communication system. To request. At this time, since it is reflected in the operation information that the transmitter / receiver e is out of order, the communication facility management unit 12 includes the pipes p and q, the optical fibers j and n, and the transmitters and receivers e and e ′. When the faulty communication path number management unit 15 requests a communication path accommodated in the communication path, the communication path is detected without including the communication path ee ′, and the detection result is output to the faulty communication path number management unit 15. .

  Based on the detection result output from the communication facility management unit 12, the fault communication channel number management unit 15 is configured to store the pipelines p and q, the optical fibers j and n, and the transceivers stored in the fault communication channel number storage unit 16. The number of faulty communication channels with e and e ′ is updated. Specifically, the fault communication path number management unit 15 changes the fault communication path number of the pipes p and q from “3” to “2”, and the fault communication path number of the optical fibers j and n is “2”. Is changed from “1” to “0”, and the number of failed communication paths of the transceivers e and e ′ is changed from “1” to “0”.

  When the update of the number of faulty communication paths for each facility by the faulty communication path number management unit 15 is completed, the connectivity management unit 27 updates the connectivity information based on the updated number of faulty communication paths. In this case, in the pipelines p to r, the number of faulty communication channels “3” in the pipeline r is the maximum number of faulty communication channels, and the maximum number of faulty communication channels in the pipeline is “3”. In the optical fibers j to o, the number of failed communication paths “2” of the optical fiber l is the maximum number of failed communication paths, and the maximum number of failed communication paths of the optical fiber is “2”. In the transceivers d to i and the transceivers d ′ to i ′, the number of faulty communication channels “1” of the transceivers d and f to i and the transceivers d ′ and f ′ to i ′ is the maximum number of faulty communication channels, The maximum number of failed communication channels of the transceiver is “1”. That is, after the transmitter / receiver e fails, the maximum number of failed communication channels does not change.

  As shown in FIG. 7B, the connectivity information after the failure of the transmitter / receiver e includes the number of active communication channels “5” and the maximum number of failed communication channels “(pipe, optical fiber, transmitter / receiver) = (3 , 2, 1) ”. As shown in FIG. 8B, the state of the communication system is such that “NG” indicating the failure state is mapped to the block z, and the block to which “OK” is mapped is changed to the blocks u and v. Also, the blocks to which “duct”, “optical fiber”, and “transceiver” are mapped are changed to blocks w, x, and y. Further, a mark (Δ) indicating the number of active communication channels is slid by one block from the right side of the block z to the right side of the block y. The failure state is a state in which data cannot be transmitted / received using the communication path via the facility due to a failure of any of the facilities constituting the communication system such as the transceiver, the optical fiber, and the pipeline.

  From the state of the communication system shown in FIG. 8B, the connectivity of the communication between the node a and the node c under the present situation where the number of operating communication channels “5” is not less than the minimum number of operating communication channels “3”. It can be seen that is maintained. In addition, in the current state, even if a single failure of either the optical fiber or the transceiver occurs, the number of operating communication channels does not fall below the minimum number of operating communication channels, so that it is understood that communication connectivity can be maintained. However, it can be seen that the number of operating communication paths may fall below the minimum number of operating communication paths when a pipeline failure occurs.

  Connection when a failure occurs in the pipeline q after the failure occurs in the transmitter / receiver e, that is, in the state of the communication system shown in FIGS. 7B and 8B, a failure occurs in the pipeline q Sex information is shown in FIG. When the failure management information indicating that a failure has occurred in the pipeline q is received from the outside, the connectivity management unit 27 requests the number of failure communication channels of the pipeline q from the failure communication channel number management unit 15 and determines the number of failure communication channels. “2” is acquired. The connectivity management unit 27 updates the number of active communication channels “5” included in the connectivity information to “3” based on the acquired number of failed communication channels “2”.

  In addition, the connectivity management unit 27 requests the communication demand management unit 14 to update the number of active communication channels stored in the communication demand storage unit 13 from “5” to “3”. In addition, the connectivity management unit 27 requests the communication facility management unit 12 to change the operation information stored in the facility information storage unit 11 to reflect that the pipeline q has failed. When the communication facility management unit 12 accepts the update of the operation information, the facility and communication path accommodated in the pipe line q based on the accommodated communication path information and the accommodated optical fiber information stored in the facility information storage unit 11. And detect. The communication facility management unit 12 detects that the optical fiber n and the optical fiber o, the communication path dd ′, the communication path ee ′, and the communication path ff ′ are accommodated in the pipe line q. To do. The communication facility management unit 12 reflects in the operation information that the pipeline q and the facility included in the detection result are out of order.

  When the update of the operation information by the communication facility management unit 12 is completed, the connectivity management unit 27 requests the failure communication path number management unit 15 to update the number of failed communication paths that becomes the update of the operation information. In response to a request from the connectivity management unit 27, the fault communication channel number management unit 15 provides information indicating the communication path accommodated in the facility for each facility provided in the communication system. To request. At this time, since the operation information reflects that the pipe q, the optical fibers n and o, and the communication paths dd ′, ee ′, and ff ′ are out of order, the communication equipment The management unit 12 detects the communication channel without including the communication channels dd ′, ee ′, and ff ′, and outputs the detection result to the failure communication channel number management unit 15.

  The fault communication path number management unit 15 is based on the detection result output from the communication facility management unit 12 and the pipes p and q stored in the fault communication path number storage unit 16 and the optical fibers j, k, n, o, and the number of faulty communication paths between the transceivers d to f and the transceivers d ′ to f ′ are updated. Specifically, the fault communication channel number management unit 15 determines the number of fault communication channels between the pipes p and q, the optical fibers j, k, n, and o, the transceivers d to f, and the transceivers d ′ to f ′. Change to “0”.

  When the update of the number of faulty communication paths for each facility by the faulty communication path number management unit 15 is completed, the connectivity management unit 27 updates the connectivity information based on the updated number of faulty communication paths. In this case, in the pipelines p to r, the number of faulty communication channels “3” in the pipeline r is the maximum number of faulty communication channels, and the maximum number of faulty communication channels in the pipeline is “3”. In the optical fibers j to o, the number of failed communication paths “2” of the optical fiber l is the maximum number of failed communication paths, and the maximum number of failed communication paths of the optical fiber is “2”. In the transceivers d to i and the transceivers d ′ to i ′, the number of faulty communication channels “1” of the transceivers g to i and the transceivers g ′ to i ′ is the maximum number of faulty communication channels, and the maximum failure of the transceiver The number of communication channels is “1”.

  As shown in FIG. 7C, the connectivity information after the failure of the pipeline q is the number of active communication channels “3”, the maximum number of failed communication channels “(pipe, optical fiber, transceiver) = (3 , 2, 1) ”. As shown in FIG. 8C, the communication system is in a state where “NG” indicating a failure state is mapped from block z to block x, and there is no block to which “OK” is mapped. Also, the blocks to which “duct”, “optical fiber”, and “transmitter / receiver” are mapped are changed to blocks u, v, and w. Further, a mark (Δ) indicating the number of active communication channels is slid by two blocks from the right side of the block y to the right side of the block w.

  From the state of the communication system shown in FIG. 8C, the connectivity of the communication between the node a and the node c under the present situation where the number of operating communication channels “3” is not less than the minimum number of operating communication channels “3”. It can be seen that is maintained. Further, it can be seen that in the current state, communication connectivity cannot be maintained when a failure occurs in any of the pipeline, the optical fiber, and the transceiver.

  Further, when a failure occurs in the optical fiber m, that is, in the state of the communication system shown in FIGS. 7C and 8C, connectivity information when a failure occurs in the optical fiber m is shown in FIG. ). When receiving the failure information indicating that a failure has occurred in the optical fiber m from the outside, the connectivity management unit 27 requests the number of failed communication paths of the optical fiber m from the failure communication path number management unit 15, and determines the number of failed communication paths. “1” is acquired. The connectivity management unit 27 updates the number of active communication channels “3” included in the connectivity information to “2” based on the acquired number of failed communication channels “1”. As a result of the failure of the optical fiber m, the number of active communication channels became “2”. As a result, the number of active communication channels “2” fell below the minimum number of active communication channels “3”, and communication connectivity could not be maintained in the communication system. I understand that.

  As described above, the connectivity management unit 27 requests the communication demand management unit 14, the communication facility management unit 12, and the failed communication path number management unit 15 to update the managed information. When the update of each information is completed, as shown in FIG. 7D, the connectivity information includes the number of active communication channels “2” and the maximum number of failed communication channels “(pipe, optical fiber, transceiver) = (2 , 2, 1) ”. As shown in FIG. 8D, the state of the communication system is such that the blocks to which “NG” is mapped are from block z to block w, and there is no block to which “duct” is mapped, and “optical fiber”. , The block to which “transmitter / receiver” is mapped is changed to blocks u and v. Further, the mark (Δ) indicating the number of active communication channels is slid by one block from the right side of the block w to the right side of the block v.

  From the state of the communication system shown in FIG. 8D, it can be seen that the communication connectivity between the node a and the node c cannot be maintained as described above.

Here, the flow of the information update process performed when the communication system management apparatus 2 according to the present embodiment causes a failure of the facility will be described. FIG. 9 is a flowchart illustrating information update processing performed by the communication system management apparatus 2.
In the communication system management device 2, when failure information indicating that a failure has occurred in the equipment provided in the communication system is input, an information update process is started, and the communication facility management unit 12 updates the operation information. The communication demand management unit 14 updates the communication demand information (step S101).

Next, the fault communication channel number management unit 15 updates the fault communication channel number of each facility based on the operation information updated by the communication facility management unit 12 and the accommodation communication channel information and the accommodation optical fiber information (step). S102).
Finally, the connectivity management unit 27 updates the connectivity information based on the number of faulty communication paths of each facility updated by the faulty communication path number management unit 15 (step S103), and ends the information update process.

  As described above, the communication system management device 2 calculates the number of failed communication channels for each facility provided in the communication system, and calculates the maximum number of failed communication channels that is the maximum number of failed communication channels for each type of facility. calculate. The communication system management apparatus 2 can calculate the influence of the failure of each facility on the communication connectivity of the communication system based on the maximum number of failed communication channels, the minimum number of operating communication channels, and the current number of operating communication channels. it can. In other words, the communication system management device 2 can grasp the degree of danger of communication interruption that can be caused to the communication system by a failure of each facility.

  In addition, since there is no upper limit to the number of locations where SRLG occurs in the communication system, it is necessary to grasp which equipment failure causes communication disconnection. The communication system management device 2 can monitor that the number of operating communication channels is equal to or greater than the minimum number of operating communication channels while detecting communication connectivity in the communication system, and detects the possibility of communication disconnection. be able to. The communication system management device 2 moves the communication path when the number of operating communication paths is less than the minimum number of operating communication paths or when the number of operating communication paths may be less than the minimum number of operating communication paths. Information for prompting the user may be output.

Moreover, when there is a possibility of communication disconnection in the communication system, the communication system management device 2 is a facility that can avoid the possibility of communication disconnection by recovering and operating the currently out of facility. It may be detected and notified to the administrator or maintenance person of the communication system. Thereby, the administrator or the maintenance person can appropriately grasp the timing for restoring the malfunctioning equipment.
In addition, the communication system management apparatus 2 according to the present embodiment is a communication system in which a minimum number of communication paths (minimum number of operating communication paths) to be guaranteed in communication between the grounds using a plurality of communication paths is determined. Applicable.

<Third Embodiment>
The communication system management apparatus in the third embodiment has the same configuration as the communication system management apparatus 2 in the second embodiment. In the present embodiment, priority class information representing the level of reliability is further stored in the communication demand storage unit 13. The connectivity management unit 27 determines the communication connectivity of the communication system based on the communication demand information, the number of failed communication channels stored in the number of failed communication channels storage unit 16, and the priority class information.

  FIG. 10 is a diagram illustrating an example of priority class information according to the third embodiment. In the example shown in FIG. 10, “high priority”, “medium priority”, and “low priority” are defined as the priority classes. In the priority class “high priority”, connectivity management is performed to notify information based on the state of the communication system so that communication interruptions are avoided in the event of any failure in the pipeline, optical fiber, or transceiver. Performed by the unit 27. In the priority class “medium priority”, the connectivity management unit 27 performs notification of information based on the state of the communication system so as to avoid communication disconnection in the event of any failure of the optical fiber or the transceiver. . In the priority class “low priority”, the connectivity management unit 27 notifies information based on the state of the communication system so as to avoid communication disconnection even when a transceiver failure occurs.

  For example, when the “high priority” shown in FIG. 10 is applied to the connectivity of communication between the node a and the node c in the communication system shown in FIG. When the state becomes the state shown in FIG. 7B and FIG. 8B, it is possible to restore the failed transmitter / receiver e or to add another communication path to the communication system. The warning information requested by the administrator or maintenance person is output. Further, the connectivity management unit 27 may output that warning information indicates that the reliability of the priority class set for the communication system cannot be satisfied if a failure occurs in the pipeline.

Based on the warning information output from the communication system management device 2, if the number of operating communication channels can be increased before a pipeline failure further occurs, communication connectivity is maintained even if a pipeline failure occurs. The possibility of being able to be increased can be increased.
When “medium priority” or “low priority” is applied to the connectivity of communication between the node a and the node c in the communication system shown in FIG. Even in the state shown in FIG. 8B and FIG. 8B, the connectivity management unit 27 does not output warning information to the administrator or the maintenance person. For this reason, communication connectivity may not be maintained due to a failure of the pipeline, and communication disconnection may occur.

  As described above, in the communication system management apparatus 2, the priority class information is stored in the communication demand storage unit 13 in advance, and the priority class applied to the communication system to be managed in the communication system management apparatus 2 is set. Warning information based on the set priority class and the current state of the communication system can be obtained. Further, based on the number of active communication channels and the maximum number of failed communication channels in the communication system, it is determined whether or not the reliability of the priority class set for the communication system can be satisfied. If a failure occurs in the equipment group (pipe, optical fiber, transmitter / receiver), whether the priority class reliability cannot be satisfied is output as warning information. By maintaining or adding a communication system according to this warning information, it becomes possible to provide a reliable ground-to-ground transfer service according to the set priority class.

  You may make it implement | achieve the communication system management apparatus in each embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” is a program that dynamically holds a program for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention. For example, the communication system illustrated in each embodiment describes a configuration in which a communication method is applied in which the same data to which the protection technology that is one of the reliability improvement technologies is applied is copied and transferred using a plurality of communication paths. However, the present invention is not limited to this, and a configuration to which a communication method using an erasure correction code as described in Non-Patent Document 2 is applied may be used. When the erasure correction code is used, the minimum number of operating communication channels can be flexibly changed according to the reliability of the communication demand due to the change in the code strength. It can be used effectively.

  Moreover, in the communication system illustrated in each embodiment, the case of determining the connectivity of communication between two communication bases (node a and node c) has been described. However, between three or more communication bases in the communication system The communication connectivity may be determined. In this case, transmitter / receiver information indicating which transmitter / receiver is installed at the communication base (node) is stored in advance in the facility information storage unit 11, and the communication facility management unit 12 communicates with the communication path corresponding to the combination of nodes. (Transceiver set) is detected. Thereby, the connectivity of communication can be grasped every time data is transmitted and received between the ground.

Moreover, in the communication system illustrated in each embodiment, although it described using the accommodation relationship as the dependency relationship regarding the failure of each facility, the dependency relationship regarding the failure between facilities other than the accommodation relationship is stored in the facility information storage unit 11, The number of faulty communication paths and connectivity information may be calculated based on the dependency relationship.
Moreover, in the communication system illustrated in each embodiment, although the structure which performs the optical communication using an optical fiber was demonstrated, it may replace with an optical fiber and may be made to use another communication line.

  In a communication system that performs transmission / reception of data between the transmission and reception using a plurality of communication paths, it can also be applied to applications where it is indispensable to determine communication connectivity of the communication system according to the operating state of each facility.

DESCRIPTION OF SYMBOLS 1, 2 ... Communication system management apparatus 11 ... Equipment information storage part 12 ... Communication equipment management part 13 ... Communication demand storage part 14 ... Communication demand management part 15 ... Fault communication channel number management part 16 ... Fault communication channel number storage part 27 ... Connectivity management unit 28 ... Connectivity information storage unit

Claims (6)

In a communication system that performs transmission and reception of data between the ground using a plurality of communication paths, operation information indicating the operation status of each of the plurality of facilities constituting the plurality of communication paths, and dependency indicating a dependency relationship between the facilities An equipment information storage unit for storing information;
A communication demand storage unit for preliminarily storing the number of communication paths necessary for maintaining transmission and reception of data in the communication system;
For each facility, when the facility fails based on the operation information and the dependency information, the number of failed communication channels, which is the number of communication channels that cannot continue to transmit and receive data among the plurality of communication channels, is calculated, A communication system management apparatus comprising: a faulty communication path number management unit that determines whether or not the necessary number of communication paths can be maintained when a failure occurs. The communication system management device according to claim 1,
Whether or not data transmission / reception can be maintained in the communication system based on the number of failed communication channels corresponding to the facility in which the failure has occurred and the required number of communication channels when a failure occurs in any of the plurality of facilities A communication system management apparatus further comprising a connectivity management unit for determining whether or not. In the communication system management apparatus according to claim 2,
A communication facility management unit that updates the operation information based on the information indicating the facility where the failure has occurred and the dependency information when a failure occurs in any of the plurality of facilities,
The fault communication path number management unit
After the operation information is updated, update the number of faulty communication paths for each of the plurality of facilities,
The connectivity management unit
Information indicating the possibility that data transmission / reception cannot be maintained in the communication system based on the number of failure communication paths of each of the plurality of facilities calculated by the failure communication path number management unit and the required number of communication paths The communication system management device characterized by the above-mentioned. In the communication system management apparatus according to claim 3,
The plurality of facilities are classified based on the dependency relationship,
The connectivity management unit
Calculate the maximum number of faulty communication channels, which is the maximum number of faulty communication channels in the equipment group of each classified facility,
Based on the number of operating communication channels among the plurality of communication channels and the maximum number of failed communication channels, a determination result as to whether or not the necessary number of communication channels can be maintained is output for each facility group. A communication system management apparatus. In the communication system management device according to claim 4,
In the communication demand storage unit, priority class information in which it is determined whether or not it is necessary to maintain transmission and reception of data in the communication system even when a failure occurs for each facility classified into the facility group. Is also remembered,
The connectivity management unit
Based on the number of operating communication channels among the plurality of communication channels and the maximum number of failed communication channels, it is determined whether or not the reliability defined in the priority class information can be satisfied. When the determination is made, the communication system management apparatus outputs information indicating whether the reliability defined in the priority class information cannot be satisfied if a failure occurs in any facility group. In a communication system that performs transmission and reception of data between the ground using a plurality of communication paths, operation information indicating the operation status of each of the plurality of facilities constituting the plurality of communication paths, and dependency indicating a dependency relationship between the facilities A communication system management method performed by a communication system management apparatus comprising: an equipment information storage unit that stores information; and a communication demand storage unit that stores in advance the number of communication paths necessary for maintaining transmission and reception of data in the communication system. And
For each facility, when the facility fails based on the operation information and the dependency information, the number of failed communication channels, which is the number of communication channels that cannot continue to transmit and receive data among the plurality of communication channels, is calculated, A communication system management method, comprising: a fault communication channel number management step for determining whether or not the necessary number of communication channels can be maintained when a failure occurs.

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