JP2000059508A - Svc connection control testing method, storage medium storing svc connection control testing program and node device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct an SVC(switched virtual channel) connection control test between adjacent nodes in short time without using the device. SOLUTION: A call setting test control part 11 checks a resource required for checking the device state of a first node itself and the setting of connection by a request from a maintenance terminal 13. When inconvenience does not exist, a connection setting instruction is informed of and an SVC protocol control part 12 transmits the message of the call setting instruction to a node 2 and it receives the instruction of connection release or the notice of a connection setting response. A connection identification part 14 receives the notice, refers to the value of a prescribed information element contained in the message and judges to which connection in user connection or test connection the message belongs. The other device such as a test terminal is not required with such constitution and the consecutive change work of the test terminal is not always required whenever a test on one interface is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an SVC (Switched
The present invention relates to an SVC connection control test method by connection, a storage medium storing an SVC connection control test program, and a node device.

[0002]

2. Description of the Related Art Conventionally, an SVC connection control test method is applied, for example, in a system configuration shown in FIG. The conventional node in this configuration has no call control test control function in the node itself. For this reason, a test terminal device is required for the connection control test. When using a test terminal device provided outside the node,
An example of the procedure of the SVC connection control test is shown in the sequence diagram of FIG. An example of the procedure shown in FIG. 11 will be described below.

(A) The test terminal 11 transmits a call setting instruction to the node 21 (procedure 31).

(B) If the node 21 determines that the connection can be set, it transmits a call setting instruction to the called device (node 22) (procedure 32). In addition, node 2
2 transmits a call setting instruction to the test terminal 12 (procedure 3
3). When it is determined that the connection cannot be set, a release instruction is transmitted to the calling device (test terminal 11).

[0005] (c) The node 22 performs the same operation as the node 21 after receiving the call setting instruction of (b).

(D) The test terminal 12 transmits a call setting response to the call setting instruction from the node 22 (procedure T3).
4).

(E) The node 22 transmits a call setting response to the test terminal 11 after receiving the call setting response from the test terminal 12 and the node 21 transmits the call setting response to the test terminal 11 after receiving the call setting response from the node 22 (procedure). T35, T36).

(F) The test terminal 11 determines that the connection setup is successful by receiving the call setup response from the node 21,
A release instruction is transmitted to the node 21. When the release instruction is received from the node 21, it is determined that the connection setting has failed.

(G) The node 21 receives the release instruction from the test terminal 11 and returns to the node 22.
After receiving the release instruction from the communication terminal 1, the release instruction is transmitted to the test terminal 12.

As described above, conventionally, nodes 21 and 22
Using the test terminal devices 11 and 12 provided outside the
Perform a connection control test.

In Japanese Patent Laid-Open Publication No. Hei 6-31230, a private telephone exchange has a function of transmitting a start signal to an opposite node device in a node (exchange) itself, and a DT (Dial Tone) signal from the opposite node device. In this example, a line connection test between adjacent nodes is performed by monitoring the connection.

[0012]

However, in the configuration of FIG. 10 and the method of FIG. 11 showing the above-mentioned prior art example, a test terminal is required to set a test connection. In addition, every time a test for one interface is performed, a work of reconnecting test terminals is required. Therefore, as the number of nodes and interfaces to be tested increases, this method has a problem that it is not a practical method.

The example disclosed in Japanese Patent Application Laid-Open No. Hei 6-31230 is mainly for transmitting / receiving a start signal / start completion signal to / from an adjacent node, and is based on a standard protocol between UNI / NNI. Confirmation of the SVC connection control function cannot be performed. More specifically, the assignment of a call number, a connection identifier and other resources, the setting / release of a user channel, and the like are performed.

[0014] The present invention has been made in view of the above-mentioned problems, and has a function of controlling call setup test with an adjacent node in a node itself, so that a node can be used for a short time without using another device such as a test terminal. It is an object of the present invention to provide an SVC connection control test method, a storage medium storing an SVC connection control test program, and a node device for realizing an SVC connection control test between adjacent nodes.

[0015]

The present invention adopts the following constitution in order to solve the above problems.

In order to solve the above-mentioned problems, an SV of the present invention is used.
The storage medium storing the C connection control test method, the SVC connection control test program, and the node device transmit a call setting instruction from the test execution node to the designated adjacent node, and the call setting instruction is transmitted to the test target node. It is determined whether the message belongs to a user connection or a test connection from a predetermined information element. Further, it is determined whether or not a test connection can be set in the test execution side node.

According to the above configuration, since the function of controlling the call setting test with the adjacent node is incorporated in the node itself, another device such as a test terminal is not required. Every time a test for one interface is performed, the work of reconnecting test terminals is not required, and the test can be performed in a short time. Also,
It is configured to identify whether the message belongs to the user connection or the test connection. Therefore, it is not necessary to use a special protocol or message for the test, and the SVC connection control test can be easily realized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The SVC connection control test method according to the first aspect of the present invention relates to an SVC connection control test method in a network constituted by nodes having a connection control function based on SVC connection. Check the device status of the node itself and perform a sort check necessary for connection setting. In the case of a failure, notify a connection setting instruction, and notify the designated adjacent node
A step of transmitting a call setting instruction conforming to a standard protocol defined by NI (terminal-network interface) / NNI (inter-network interface); and the test target node includes the call setting instruction received from the opposite node. A connection setting instruction in which the content of each information element is set is notified.From the predetermined information element of the connection setting instruction, it is determined whether the message belongs to a user connection or a test connection. If it is determined that they belong, a connection setting instruction is transmitted.

Further, the test execution side node determines whether or not a test connection can be set when receiving the connection setting instruction. If it is determined that the test connection can be set, the connection setting response is determined. Transmitting a connection release instruction, and transmitting a message conforming to the standard protocol to the opposing node in accordance with the content of the notified message. In the test execution node, the SVC protocol control unit transmits the standard received from the opposing node. A message in which the content of each information element included in a message conforming to the protocol is set is notified to the connection identification unit, and the connection identification unit determines whether the message is a user connection based on a predetermined information element value in the received message. Or test connection If it is determined that the call belongs to the test connection, the received message is transmitted to the call setting test control unit. At the test execution node, the call setting test control unit responds to the content of the message received from the connection identification unit. A step of determining whether a test connection can be set or not.

According to this configuration, the node itself has a built-in call setting test control function with an adjacent node. For this reason, another device such as a test terminal is not required, and every time a test for one interface is performed, the work of reconnecting the test terminals is not required, and the test can be performed in a short time. Further, it has a function of identifying whether the message belongs to a user connection or a test connection. Thus, no special protocols or messages need to be used for testing.

According to the second aspect of the present invention, when it is determined that the connection cannot be set in the step of determining whether the connection can be set, the step of specifying the cause of the failure based on the type of the message and the information element in the message is performed. Further, a configuration is provided. With this configuration, the cause of the failure can be quickly known.

According to the third aspect of the present invention, a subscriber information table creating step for specifying an outgoing port from a destination address included in the call setting instruction, and a subscriber information table changing step for changing the subscriber information table Are further provided.

According to a fourth aspect of the present invention, the above-mentioned SVC connection control test method further comprises a step of executing an SVC connection control test, and the result of the SVC connection control test indicates that connection setting to a specific output port is not performed. When it is determined to be impossible, all subscriber information related to the outgoing port is changed in the subscriber information table changing step.

According to a fifth aspect of the present invention, there is provided a storage medium storing an SVC connection control test program.
A storage medium in which an SVC connection control test program applied to a node having a connection control function by C connection is recorded. In a test execution node, a check of a device state of the node itself and a sort check necessary for connection setting are performed. , In case of malfunction,
Notifying a connection setting instruction and transmitting a call setting instruction conforming to a standard protocol defined by UNI (terminal-network interface) / NNI (inter-network interface) to a designated adjacent node; The node notifies the connection setting instruction which sets the content of each information element included in the call setting instruction received from the correspondent node, and, based on the predetermined information element of the connection setting instruction, the message is used for the user connection and the test. Determining which of the connections it belongs to, and transmitting a connection setting instruction if it is determined that the connection belongs to the test connection.

Further, at the node under test, upon receiving the connection setting instruction, it is determined whether a test connection can be set. If it is determined that a test connection can be set, a connection setting response is determined. Transmitting a connection release instruction, and transmitting a message conforming to the standard protocol to the opposing node in accordance with the content of the notified message. In the test execution node, the SVC protocol control unit transmits the standard received from the opposing node. A message in which the content of each information element included in a message conforming to the protocol is set is notified to the connection identification unit, and the connection identification unit determines whether the message is a user connection based on a predetermined information element value in the received message. Or test connection Transmitting the received message to the call setup test control unit when it is determined that the call belongs to the test connection, and, at the test execution node, the call setup test control unit And a step of determining whether a test connection can be set according to the above.

According to this configuration, since the node itself has a function of controlling the call setting test with the adjacent node, no other device such as a test terminal is required, and every time a test is performed on one interface, The work of reconnecting the test terminals is unnecessary, and the test can be performed in a short time. In addition, since it has a function of identifying whether the message belongs to the user connection or the test connection, there is no need to use a special protocol or message for the test, and the SVC connection control test can be easily performed. It is possible.

In the invention according to claim 6, when it is determined that the connection cannot be set in the step of determining whether or not the setting is possible, a failure factor identification step of identifying a failure cause from a message type and an information element in the message is performed. Further, a configuration is provided. With this configuration, the cause of the failure can be quickly known.

According to the present invention, a subscriber information table creating step for specifying an outgoing port from a destination address included in the call setting instruction, and a subscriber information table changing step for changing the subscriber information table Are further provided.

According to the invention of claim 8, the storage medium on which the SVC connection control test program is recorded is:
The method further comprises the step of executing an SVC connection control test. If the result of the SVC connection control test indicates that connection setting to a specific output port is impossible, the subscriber information table changing step is used to change the connection to the specific output port. A configuration for changing all the subscriber information is adopted.

According to a ninth aspect of the present invention, there is provided a node device comprising: a first maintenance terminal; a first node; a lower layer;
In the first node in which the node and the second maintenance terminal are connected by the SVC connection, a call control test is started with a call setting test start request from the first maintenance terminal as a trigger, and the first first The node checks its own device status and the resources required for connection setting.If there are no problems, the call setting test control unit that notifies the connection setting instruction and the standard protocol with the connection setting instruction as a trigger are used. SVC protocol for transmitting a call setting instruction message to the second node, receiving a connection release instruction or a connection setting response in response to the message, and notifying a connection release instruction or a connection setting response in response to the received message. A control unit, which receives a notification and requests a predetermined information included in the message; The reference value, it is determined whether the message belongs to any of the connection test and user connection, taking a connection identification unit for notifying a message to call setting test control unit, a configuration having a.

According to this configuration, since the function of controlling the call setting test with the adjacent node is incorporated in the node itself, another device such as a test terminal is unnecessary, and every time a test is performed on one interface, The work of reconnecting the test terminals is unnecessary, and the test can be performed in a short time. In addition, since it has a function of identifying whether the message belongs to the user connection or the test connection, there is no need to use a special protocol or message for the test, and the SVC connection control test can be easily performed. It is possible.

According to the tenth aspect of the present invention, when the call setting test control unit determines that the connection cannot be set from the message notified from the connection identifying unit, the call setting test control unit determines the cause of the failure from the type of the message and the information element in the message. Take a specific configuration. With this configuration, the cause of the failure can be quickly known.

According to the eleventh aspect of the present invention, there is provided a function for creating a subscriber information table for specifying an outgoing port from a destination address included in the call setting instruction, and a change of the subscriber information table for changing the subscriber information table. If it is determined that connection setting to a specific outgoing port is not possible as a result of the SVC connection control test, all the subscriber information related to the outgoing port stored in the subscriber information table is deleted. Take a configuration to change.

In the twelfth aspect of the present invention, the node device executes an SVC connection control test, and executes the SVC connection control test.
If the result of the VC connection control test indicates that connection to a specific outgoing port cannot be set, all subscriber information related to the outgoing port is changed by the subscriber information table change function.

Next, an SVC connection control test method, a storage medium storing an SVC connection control test program and a node device according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 to FIG. 9 are diagrams for explaining a configuration according to an embodiment of an SVC connection control test method, a storage medium storing an SVC connection control test program, and a node device according to the present invention.

(Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an SVC connection control test according to one embodiment of the present invention. FIG. 2 is a sequence diagram showing an example of a message sequence when the SVC connection control test is successful in the system configuration shown in FIG. 1, and FIG. 3 is a sequence diagram showing an example of a message sequence when the SVC connection control test is unsuccessful. .

FIGS. 4 to 6 are flowcharts showing an example of specific processing in the call setting test control section. FIG. 4 is a flowchart showing a process performed by the call setting test control unit on the test execution side when receiving a call setting test start request. FIG. 5 is a flowchart illustrating a process performed by the call setting test control unit on the test target side when receiving a connection setting instruction. FIG. 6 is a flowchart showing a process at the time of receiving a connection release response of the call setting test control unit on the test execution side.

In FIG. 1, node devices to which the SVC connection control test method of the present embodiment is applied include call setup test control units 11 and 21, an SVC protocol control unit 12,
22, maintenance terminals 13, 23, connection identification unit 14,
24, a call exchange control unit 15, 25, and a communication layer (hereinafter, also referred to as a lower layer) 31 below the SVC protocol control units 12, 22. Next, the operation of the node device configured as described above will be described with reference to FIGS. FIG. 2 shows a case where the SVC connection control test is successful, and FIG. 3 shows a case where the SVC connection control test is unsuccessful.

2 and 4 to 6, the call setting test control section 11 starts a call control test triggered by a call setting test start request from the maintenance terminal 13. The call setting test control unit 11 first checks the device state of the own node (step S1) and checks resources required for connection setting (step S2). If there is a defect in these checks (NO in step S1,
(NO side of step S2), the call setting process is stopped, and a failure code is output to the test result output unit (step S2).
4). By this execution, a failure code indicating the location of the failure (in this case, the own node) and the cause is stored in the maintenance terminal 13.
Displayed at

If there is no problem (Y in step S1)
On the ES side, the YES side of step S2), the call setting test control unit 11 notifies the SVC protocol control unit 12 of a connection setting instruction (step S3, procedure T1). At this time, the value of the predetermined information element in the connection setting instruction is set to a value indicating that the message belongs to the test connection. Specifically, it is preferable to use the destination address of the information elements, since it does not affect band allocation control or the like.

The SVC protocol control unit 12 transmits a call setting instruction message to the SVC protocol control unit 22 of the adjacent node based on the standard protocol using the connection setting instruction as a trigger (procedure T2).

In FIG. 5, the SVC protocol control unit 2
2 receives the above-mentioned call setting instruction message, and then notifies the connection identifying unit 24 of a connection setting instruction in which the contents of each information element included in the above-mentioned call setting instruction message are set (START of call setting 11). The connection identifying unit 24 transmits the connection setting instruction to the call setting test control unit 21 because the destination address is set to the address indicating the test connection (procedure T).
3). The call setting test control unit 21 checks the state of the device of the own node (step S21) and checks resources required for connection setting (step S22).

If there is a problem, a failure occurrence location (in this case, an adjacent node) and a failure code indicating the cause are set in the connection release instruction message, and the failure is notified to the SVC protocol control unit 22 (step S24).

On the other hand, if there is no failure, the call setting test control section 21 notifies the SVC protocol control section 22 of a connection setting response message (step S23, procedure T4). The SVC protocol control unit 22 sends a message (release instruction or call setup response message) conforming to the standard protocol to the SVC protocol control unit 12 of the adjacent node according to the message type and content notified from the call setup test control unit 21. Transmit (procedure T5).

The SVC protocol control unit 12 notifies the connection identifying unit 14 of a connection release instruction or a connection setting response according to the message received from the SVC protocol control unit 22 of the adjacent node. The connection identification unit 14 refers to the value of a predetermined information element included in the message, and determines whether the message belongs to a user connection or a test connection. Specifically, a call number that can uniquely identify a connection is used. Here, since the call number indicates a connection for a call control test, the connection identification unit 14
To the above message (procedure T6).

In FIG. 6, the call setting test control section 11
When receiving the connection release instruction, the maintenance terminal 13 displays a failure code included in the message (step S31). When a timeout instruction is received from the SVC protocol control unit 12, a failure code indicating a timeout of a lower layer is sent to the maintenance terminal 13.
Displayed at On the other hand, when the connection setting response is received, it is determined that the connection control test has been successful, a code indicating the test success is displayed on the maintenance terminal 13, and S is issued to release the test connection.
A connection release instruction is notified to the VC protocol control unit 12 (procedure T7), and all resources allocated to the connection are released (step S32).

The SVC protocol controller 12 uses the connection release instruction as a trigger to notify a release instruction message to the SVC protocol controller 22 of the adjacent node based on the call control protocol (procedure T8). The SVC protocol control unit 22 further includes a connection identification unit 24
Sends a connection release instruction to Since the call number included in the connection release instruction indicates the connection for the call control test, the connection identifying unit 24 notifies the call setting test control unit 21 of the message (step T9). The call setting test control unit 21 notifies the connection release response and releases all resources to which the connection is allocated (procedures T10, T11, and T12).
The call control test control is completed.

Next, an SVC connection detour method and a failback method using the present SVC connection control test method will be described. FIG. 7 is a network configuration diagram, FIG.
Is the subscriber information table of the node 11, and FIG.
4 is a flowchart showing an SVC connection bypass method and a failback method in the first embodiment.

In FIG. 3 and FIGS. 7 to 9, the network management device 31 transmits an SVC connection control test request to the node 11. Node 11 is node 1
An SVC connection control test between the first node and the node 12 is executed (step S41, procedure 21, T22, T23).
Here, when the test execution result is NG (step S42)
NO side), the node 11 rewrites the subscriber information table shown in FIG. 8 (step S43). Specifically, for all the subscriber information in which the port # 2 connected to the node 12 is the first outgoing port (priority outgoing port),
The first outgoing port and the second outgoing port (non-priority outgoing port) are exchanged, and the change flag is turned on (step S44). This makes it possible to set up an SVC connection via port # 3 while avoiding port # 2 in which a failure has occurred. That is, the SVC connection between the nodes 11 to 12 is released (procedures T24 to T29), and the node 1
The SVC connection settings of 1 to 13 to 14 are set.

The network management device 31 is connected to port # 2
After the failure is detected, the S
A VC connection control test request is transmitted to the node 11. The node 11 executes the test each time (step S41). When the execution result is OK (failure recovery completed) (YES in step S42), the node 11 refers to the change flag in the subscriber information table (step S45). Then, the first output port and the second output port that have been changed due to the failure are returned to the original settings (step S46), and the change flag is turned off (step S47).

[0051]

As is clear from the above description, according to the SVC connection control test method, the storage medium storing the SVC connection control test program and the node device of the present invention, the adjacent node specified by the test execution node is used. A call setting instruction is transmitted to the node, and the test target node determines from the predetermined information element of the connection setting instruction whether the message belongs to the user connection or the test connection. Further, it is determined whether or not a test connection can be set in the test execution side node.

According to the above configuration, since the function of controlling the call setting test with the adjacent node is incorporated in the node itself, another device such as a test terminal is not required. Every time a test for one interface is performed, the work of reconnecting test terminals is not required, and the test can be performed in a short time. Also,
It is configured to identify whether the message belongs to the user connection or the test connection. Therefore, it is not necessary to use a special protocol or message for the test, and the SVC connection control test can be easily realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an SVC connection control test according to an embodiment of the SVC connection control test method of the present invention.

FIG. 2 is a message sequence diagram when an SVC connection control test is successful in the system configuration shown in FIG. 1;

FIG. 3 is a sequence diagram showing an example of a message sequence when an SVC connection control test is unsuccessful.

FIG. 4 is a flowchart showing an example of specific processing in a call setting test control unit and showing processing when a call setting test start request is received by a call setting test control unit on the test execution side;

FIG. 5 is a flowchart showing a process performed when a call setting test control unit on the test target side receives a connection setting instruction.

FIG. 6 is a flowchart showing a process performed when a call release test control unit on the test execution side receives a connection release response.

FIG. 7 is a network configuration diagram.

FIG. 8 is a diagram showing a subscriber information table of a node 11;

FIG. 9 is a flowchart showing an SVC connection bypass method and a failback method in the node 11;

FIG. 10 is a system configuration diagram showing a conventional SVC connection control test method.

FIG. 11 is a sequence diagram showing connection setting to release in a conventional SVC connection control test method.

[Explanation of symbols]

 1, 2 node 11, 21 call setup test control unit 13, 23 maintenance terminal 12, 22 SVC protocol control unit 14, 24 connection identification unit 15, 25 call exchange control unit 31 lower layer

Claims (12)

[Claims] An SVC in a network constituted by nodes having a connection control function by an SVC connection
A VC connection control test method, in which a test execution node checks the device status of the node itself and checks the sort required for connection setting, and in the case of a failure, notifies a connection setting instruction and notifies a designated neighbor. Transmitting a call setting instruction conforming to a standard protocol defined by UNI (terminal-to-network interface) / NNI (inter-network interface) to a node to be tested; Notify a connection setting instruction that sets the content of each information element included in the, from the predetermined information elements of the connection setting instruction, determine whether the message belongs to the user connection or the test connection, test Connection is determined to belong to the connection for And transmitting a setting instruction, the test to be carried node, at connection setting instruction receiving a connection setup response if the test connection determines whether it is possible to set, and determined to be,
If it is determined that the connection is not possible, a connection release instruction is notified, and a message conforming to the standard protocol is transmitted to the correspondent node according to the content of the notified message. Notifies the connection identification unit a message in which the content of each information element included in the message conforming to the standard protocol received from the opposite node is set to the connection identification unit, and the connection identification unit receives the predetermined information element in the received message. Determining whether the message belongs to the user connection or the test connection from the value, and transmitting the received message to the call setting test control unit if it is determined that the message belongs to the test connection; In the node, the call setup test control unit SVC connection control testing method characterized by comprising the step of performing setting propriety determination of the test connection in accordance with the content of messages received from the down identifying portion. 2. The method according to claim 1, further comprising a failure factor identification step of identifying a cause of the failure from a type of the message and an information element in the message when it is determined that the connection cannot be set in the step of determining whether the setting is possible. The SVC connection control test method according to claim 1, wherein 3. A subscriber information table creating step of specifying an outgoing port from a destination address included in the call setting instruction, and a subscriber information table changing step of changing the subscriber information table. The SVC connection control test method according to claim 1 or 2, wherein: 4. The SVC connection control test method further comprises the step of executing an SVC connection control test, wherein when the result of the SVC connection control test indicates that connection setting to a specific output port is not possible, 4. The SVC connection control test method according to claim 3, wherein all the subscriber information related to the outgoing port is changed in the subscriber information table changing step. 5. A storage medium storing an SVC connection control test program applied to a node having a connection control function based on an SVC connection, which is necessary for a test execution node to check a device state of the node itself and to set a connection. It performs a re-sort check, notifies a connection setting instruction even in the case of a failure, and sends a call to a designated adjacent node according to a standard protocol defined by UNI (terminal-network interface) / NNI (inter-network interface). A step of transmitting a setting instruction, and in the node under test, a connection setting instruction in which the content of each information element included in the call setting instruction received from the opposite node is set, and the connection setting instruction is determined in advance. From the information element, the message is The connection setting instruction is transmitted, and if it is determined that the connection belongs to the test connection, the connection setting instruction is transmitted. Is determined, and if it is determined that connection is possible, a connection setting response is
If it is determined that the connection is not possible, a connection release instruction is notified, and a message conforming to the standard protocol is transmitted to the correspondent node according to the content of the notified message. Notifies the connection identification unit a message in which the content of each information element included in the message conforming to the standard protocol received from the opposite node is set to the connection identification unit, and the connection identification unit receives the predetermined information element in the received message. Determining whether the message belongs to the user connection or the test connection from the value, and transmitting the received message to the call setting test control unit if it is determined that the message belongs to the test connection; In the node, the call setup test control unit Storage medium storing an SVC connection control test program characterized by comprising a step of performing setting propriety determination of the test connection in accordance with the content of messages received from the down identifying portion. 6. The method according to claim 1, further comprising a failure factor identification step of identifying a failure cause from a type of the message and an information element in the message when it is determined that the connection cannot be set in the setting availability determination step. A storage medium storing the SVC connection control test program according to claim 5. 7. A subscriber information table creating step of specifying an outgoing port from a destination address included in the call setting instruction, and a subscriber information table changing step of changing the subscriber information table. A storage medium storing the SVC connection control test program according to claim 5 or 6. 8. The storage medium on which the SVC connection control test program is recorded, further comprising a step of executing an SVC connection control test, wherein the result of the SVC connection control test indicates that connection to a specific output port cannot be set. 8. The storage medium according to claim 7, wherein, if determined, all subscriber information related to the outgoing port is changed in the subscriber information table changing step. 9. The first node to which a first maintenance terminal is connected to a first node, the first node is connected to the second node, and a second node is connected to a second maintenance terminal. Starting a call control test triggered by a call setting test start request from the first maintenance terminal, first checking the device state of the first node itself and checking resources required for connection setting, If there is no failure, a call setting test control unit for notifying a connection setting instruction, and transmitting a call setting instruction message to the second node based on a standard protocol with the connection setting instruction as a trigger, Received a connection release instruction or a connection setup response according to the received message, and received a connection release instruction or a connection setup response according to the received message. An SVC protocol control unit for notifying a response, referring to a value of a predetermined information element included in the received message and determining whether the message belongs to a user connection or a test connection, And a connection identification unit for notifying the call setting test control unit of the message. 10. The call setup test control unit, when determining that connection setup is impossible from a message notified from the connection identification unit, specifies a cause of failure from a type of the message and an information element in the message. The node device according to claim 9, wherein 11. An SVC further comprising: a function of creating a subscriber information table for specifying an outgoing port from a destination address included in the call setting instruction; and a function of changing a subscriber information table for changing the subscriber information table. When it is determined that the connection setting to the specific outgoing port is impossible in the result of the connection control test, all the subscriber information related to the outgoing port stored in the subscriber information table is changed. The node device according to claim 9 or 10, wherein 12. The node device executes an SVC connection control test, and if it is determined in the result of the SVC connection control test that a connection to a specific outgoing port cannot be set, the node device table change function. The node device according to claim 11, wherein all the subscriber information related to the outgoing port is changed.