JPH0918480A - Testing system of frame relay network - Google Patents

Abstract

PURPOSE: To obtain the testing system of a frame relay network which is capable of automatically matching with states, terminating a test without discrepancy and continuing the test without discrepancy when restarts are generated at the various kinds of portions of the frame relay network. CONSTITUTION: A restart, processor 20 reads the identification data under test saved in a non-volatile memory and recognizes that a test is performed, the information to the effect that the test is performed is imparted to an exchange main body 5 and a restart generation notification is performed. When the restart processor 10 of the main body 5 recognizes the restart generation under test by the restart generation notification, the test release request which is the same as the release of a normal test is notified to a station side line terminating device 3. The restart processor 20 of the device 3 notifies a subscriber side line terminating device 2 of the received test release request on the control channel of a line 4. As a result, the terminating device 2 releases a loop setting and shifts to a normal state. When this device 2 notifies the device 3 of a release completion response and the release completion response of the device 2 is received in the device 3, the release completion response is notified to the main body 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame relay network test system.

[0002]

2. Description of the Related Art A frame relay network is a kind of packet communication network using a frame relay as a unit of data transfer and is a switching network which facilitates error control of the network. FIG. 10 is a conceptual diagram of the configuration of the frame relay network. In the figure, reference numeral 1 is a plurality of subscriber terminals, and 2 is a subscriber side line terminating device connected to these subscriber terminals 1. Reference numeral 3 denotes a station side line terminating device connected to the subscriber side line terminating device 2 via a line 4. As the line 4, for example, a DSI of about 1.5 Mbps is used. 5 is an exchange main body as a host device connected to the office side line terminating device 3,
Reference numeral 6 denotes an operator console connected to the exchange main body 5. The exchange main body 5 and the office side line termination device 3 are
Become the station side.

In the system thus configured, a loopback test (loopback test) is performed in order to confirm the normality of the network. That is, the operator console 6
When an operator inputs a test instruction from, the station side line terminating device 3 sends the test data to the subscriber side line terminating device 2 via the line 4, and the subscriber side line terminating device 2 returns the test data to reverse the route. Following this, it returns to the station-side line termination device 3. Here, the normality of the network can be confirmed by collating the transmitted data with the returned data.

FIG. 11 is a sequence diagram showing the operation of the conventional system. The operator has an operator console 6
When an instruction to perform a loopback test is issued from, the exchange main body saves the in-test identifier indicating that the test is in progress in the internal memory (S1). The * mark in the figure indicates the point at which the operation was performed or the point at which the state transitioned (same below). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). Upon receiving this test start request, the station side line terminating device 3 saves the in-test identifier in the internal memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request on the control channel of the line 4 (S4). As a result, the subscriber side line terminating device 2 completes the loop setting and shifts to the test state (S5).

When the loop setting is completed, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). Upon receiving the setting completion response, the station side line terminating device 3 notifies the exchange main body 5 of the setting completion response (S7). Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the test frame transmission request (S8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9). The sent test frame is looped back by the subscriber side line terminating device 2 and reaches the office side line terminating device 3. At this point, it is assumed that the station side line terminating device 3 is restarted due to a failure (S10). Here, restart means
This means that the CPU inside the device is reset due to the occurrence of a failure such as a momentary power failure.

The station side line terminating device 3 notifies the exchange main body 5 that a restart has occurred (S11). Switch body 5
Upon receiving the resumption occurrence notification, displays on the operator console 6 that a failure has occurred in the station side line terminating device 3 (S12). When the operator (maintenance person) confirms the occurrence of the failure, the operator issues a test cancel command from the operator console 6 (S13). The exchange body 5 is
Upon receiving this command, the station side line terminating device 3 is notified of the test cancellation request (S14). Upon receiving the test cancellation request, the station side circuit terminating device 3 notifies the subscriber side circuit terminating device 2 of the test cancellation request on the control channel of the line 4 (S).
15). Upon receiving this test release state, the subscriber side line termination device 2 releases the loop setting and shifts to the normal state (S16). Next, the subscriber side line termination device 2 notifies the office side line termination device 3 of a release completion response (S17). Upon receiving this cancellation completion notification, the station side line terminal device 3 clears the in-test identifier saved in the memory (S1).
8) The cancellation completion response is notified to the exchange main body 5 (S198). Upon receiving this cancellation completion response, the exchange main body 5 clears the in-test identifier saved in the memory (S20). As a result, the system returns to the state before the test, that is, the normal state.

[0007]

In the above-mentioned conventional system, when the station side line terminating device 3 or the exchange main body 5 is restarted, the station side line terminating device 3 or the exchange main body 5 is used.
Forgets the state of the subscriber side line terminating device 2 for software, firmware, and hardware. However, since the subscriber side line terminating device 2 does not have a function of automatically releasing the loopback state due to line disconnection or the like, it remains in the loopback state. This causes a state mismatch between the station side and the subscriber side. In this state, when the station side performs a normal operation with respect to the subscriber side, the subscriber side remains in the loopback state and does not respond to the request from the station side. Therefore, the station side determines that there is an abnormality on the subscriber side. Therefore, as shown in FIG. 11, in the conventional system, when the restart occurs during the loop, it is necessary to cancel the loopback state on the subscriber side by issuing a cancel command manually by the operator.

The present invention has been made in view of the above problems, and when restarts occur at various points in the network, the states are automatically matched to complete the test without a contradiction, or the test is performed. It is an object of the present invention to provide a frame relay network test system that can continue without conflict.

[0009]

FIG. 1 is a block diagram showing the principle of the present invention. The same components as those in FIG. 10 are denoted by the same reference numerals. In the figure, reference numeral 1 is a plurality of subscriber terminals, and 2 is a subscriber side line terminating device connected to these subscriber terminals 1. Reference numeral 3 denotes a station side line terminating device connected to the subscriber side line terminating device 2 via a line 4. Reference numeral 5 is an exchange main body as a host device connected to the office side line terminating device 3, and 6 is an operator console connected to the exchange main body 5. The subscriber terminal 1 and the subscriber side line terminating device 2 are the subscriber side, and the exchange main body 5 and the station side line terminating device 3 are the station side.

In the exchange main body 5, 10 notifies the station side line terminating device 3 of the restart occurrence when the restart occurs, or performs a test cancellation process or a test continuation process and performs other processes associated with the restart occurrence. Is a restart processing means.
In the station side line terminating device 3, the second restart process 20 notifies the exchange main unit 5 of the restart occurrence when the restart occurs, or performs the test cancellation process or the test continuation process and performs other processes accompanying the restart occurrence. It is a means.

In this case, it is necessary to provide a memory for storing an in-test identifier for identifying that the system is under test in each of the exchange main body 5 and the station side line terminating device 3 so that the own device can be used when the test is restarted. It is preferable for recognizing the state of.

When the station side line terminating device 3 puts the subscriber side line terminating device 2 into the test state, the first line of the exchange main body 5 is used.
Second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the memory and restarts the station side line terminating device 3 during the test.
Notifies the exchange main unit 5 of the resumption occurrence, and when the first resumption processing means 10 of the exchange main unit 5 receives this resumption occurrence notification, it confirms that the in-test identifier is saved in the memory, and the station side line It is preferable to perform the test cancellation procedure on the terminating device 3 in order to automatically match the states and end the test consistently.

When the station side line terminating device 3 sets the subscriber side line terminating device 2 in the test state, the station side line terminating device 3 is used.
Second restart processing means 20 saves the in-test identifier in the memory, and when restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 causes the station side line termination device to operate. Second restart processing means 2 of the station side line terminating device 3 which has notified the restart occurrence to
When 0 confirms that the in-test identifier is saved in the memory, it sends a test status notification to the exchange main body 5, and when the first restart processing means 10 of the exchange main body 5 receives this test status notification, the station side It is preferable to perform the test release procedure for the line terminating device 3 in order to automatically match the states and end the test without contradiction.

When the station side line terminating device 3 puts the subscriber side line terminating device 2 into the test state, the station side line terminating device 3 is used.
Second restart processing means 20 saves the in-test identifier in the memory, and when restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 uses the station side line termination device. When the second restart processing means 20 of the station side line terminating device 3 that has received this restart occurrence notification confirms that the in-test identifier is saved in the memory, Test status notification,
The station-side line termination device 3 continues the test, and after the test is completed,
Restart processing means 20 notifies the exchange main body 5 of a test completion notification, and the first restart processing means 10 of the exchange main body 5 receives the test completion notification and performs a test release procedure on the station side line terminating device 3. However, it is preferable for automatically adjusting the states to continue the test without any inconsistency and then ending the test without any inconsistency.

When the station side line terminating device 3 sets the subscriber side line terminating device 2 in the test state, the station side line terminating device 3 is used.
Second restart processing means 20 saves the in-test identifier in the memory, and when restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 terminates the station side line termination. The second restart processing means 20 of the station side line terminating device 3 which notifies the device 3 of the restart occurrence and receives the restart occurrence
After confirming that the identifier under test is saved in the memory, autonomously canceling the test of the subscriber's line terminating device 2 can automatically match the states and end the test without contradiction. preferable.

When the station side line terminating device 3 sets the subscriber side line terminating device 2 in the test state, the station side line terminating device 3 is used.
The second restart processing means 20 saves the in-test identifier in the non-volatile memory, and when restarting to restart the station side line terminating device 3 in the exchange main body 5 also occurs during the test, the station side line terminating device 3 After the restart, the second restart processing means 20 gives the exchange main body 5 the contents of the non-volatile memory to notify the presence or absence of the test before the restart, and the first restart processing of the exchange main body 5 which has received the notification. When there is a test, the means 10 preferably notifies the station side line terminating device 3 of the test cancellation request and terminates the test in order to automatically match the states and terminate the test without contradiction.

When the station side line terminating device 3 sets the subscriber side line terminating device 2 in the test state, the station side line terminating device 3 is used.
The second restart processing means 20 saves the in-test identifier in the non-volatile memory, and when restarting to restart the station side line terminating device 3 in the exchange main body 5 also occurs during the test, the station side line terminating device 3 After restarting, the second restart processing means 20 adds the saved contents of the nonvolatile memory to the exchange main body 5 to notify the presence or absence of the test before restarting, and the first restart processing means of the exchange main body 5 which has received this notification. It is preferable that 10 transmits a test frame transmission request to the station side line terminating device 3 when there is a test and continues the test in order to automatically match the states and continue the test without contradiction.

Further, when the station side line terminating device 3 puts the subscriber side line terminating device 2 into the test state, the second restart processing means 20 of the station side line terminating device 3 stores the identifier under test in the non-volatile memory. In the case where a restart occurs that saves and restarts the station side line terminating device 3 in the exchange main body 5 during the test, the second restart processing means 20 of the station side line terminating device 3 causes the nonvolatile memory to store the identifier under test. If the second resumption processing means 20 of the station-side line termination device 3 autonomously cancels the test state of the subscriber-side line termination device 2, the state is automatically adjusted. This is preferable in that the test can be completed without any inconsistency.

[0019]

When the restart occurs, the exchange main body 5 is notified to the station side line terminating device 3 that the restart has occurred, or the test cancellation process or the test continuation process is performed, and other processes associated with the restart occurrence are performed. The restart processing means 10 notifies the switch side main unit 5 of the restart occurrence when the restart occurs, or performs the test cancellation processing or the test continuation processing, and performs other processing accompanying the restart occurrence. Two restart processing means 20 are provided respectively. This allows the states to be automatically matched to terminate the test consistently or to continue consistently when restarts occur at various points in the network.

In this case, a memory for storing an in-test identifier for identifying that the system is under test is provided in each of the exchange main body 5 and the station-side line terminating device 3 so that the device itself when the test is restarted. The state of can be recognized.

When the station side line terminating device 3 is restarted during the test, the second resumption processing means 20 of the station side line terminating device 3 notifies the exchange main body 5 of the occurrence of the restart, and the exchange main body. When the first restart processing means 10 of 5 receives this restart occurrence notification and confirms that the in-test identifier is saved in the memory, it performs the test release procedure for the station side line terminating device 3, Tests can be completed consistently with automatic state matching.

Further, when a restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 notifies the office side line terminating device 3 of the restart occurrence and receives the restart occurrence. When the second restart processing means 20 of the station side line terminating device 3 confirms that the in-test identifier is saved in the memory, it notifies the exchange main body 5 of the test status, and the first restart processing of the exchange main body 5 is performed. When the means 10 receives this test status notification, it performs the test cancellation procedure for the station side line terminating device 3 to automatically match the status and complete the test without contradiction.

Further, when a restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 notifies the office side line terminating device 3 of the restart occurrence, and the restart occurrence notification is issued. When the second restart processing means 20 of the station side line terminating device 3 confirms that the in-test identifier is saved in the memory, it notifies the exchange main body 5 of the test status, and the station side line terminating device 3 The test is continued, and after the test is finished, the second restart processing means 20 notifies the exchange main body 5 of the test completion notification, and the first restart processing means 1 of the exchange main body 5 is notified.
When 0 receives the test completion notification, it performs the test release procedure on the station side line terminating device 3 to automatically match the states and continue the test without any contradiction, and then terminate the test without any contradiction. it can.

When restarting occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5
Notifies the station side line terminating device 3 of the resumption occurrence, and the second resumption processing means 20 of the station side line terminating device 3 which has received the resumption confirmation confirms that the in-test identifier is saved in the memory. Then, by autonomously canceling the test of the subscriber-side circuit terminating device 2, it is possible to automatically match the states and complete the test without contradiction.

Further, during the test, when a restart for restarting the office side line terminating device 3 also occurs in the exchange main body 5, the second restart processing means 20 of the office side line terminating device 3 causes the exchange main body 5 to restart. When the test is present, the first restart processing means 10 of the exchange main body 5 which receives the notification of the presence / absence of the test before the restart by giving the saved contents of the nonvolatile memory to the test, issues a test cancellation request. By notifying the station side line terminating device 3 and ending the test, the states can be automatically matched and the test can be ended without contradiction.

Further, during the test, in the case where a restart for restarting the station side line terminating device 3 also occurs in the exchange side main unit 5, the second restart processing means 20 of the station side line terminating device 3 causes the switch side main unit 5 to restart after the restart. The first restart processing means 10 of the exchange main body 5 which receives the notification of the presence or absence of the test before resuming by giving the saved contents of the non-volatile memory, sends a test frame transmission request when the test is present. By sending the signal to the side circuit terminating device 3 and continuing the test, the states can be automatically matched and the test can be continued without contradiction.

Further, during the test, if a restart for restarting the station side line terminating device 3 also occurs in the exchange main body 5, the second restart processing means 20 of the station side line terminating device 3 causes the nonvolatile memory to perform a test. When it is confirmed that the medium identifier has been saved, the second restart processing means 20 of the station side line terminating device 3 autonomously releases the test state of the subscriber side line terminating device 2 to automatically set the state. Can be matched to complete the test consistently.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a diagram showing an example of a sequence in the normal operation of the present invention. The system uses the configuration shown in FIG. In the present invention, the exchange main body 5 and the office side line terminating device 3
Each of these has a memory for storing an in-test identifier that identifies that the system is under test. Therefore,
Each of the exchange main body 5 and the office side line terminating device 3 can recognize the state of its own device at the time of restarting the test by looking at the contents of this memory.

When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the in-test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of the test start request from the control channel of the line 4 (S4).

Upon receiving this test start request, the subscriber side line termination device 2 completes the setting of the loop loop and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

This test frame is returned by the subscriber side line terminating device 2 and returned to the office side line terminating device 3. The station-side line termination device 3 compares the received frame with the transmitted frame and checks the received frame (S10). This completes the test (S1
1), the station side line terminating device 3 notifies the exchange main body 5 of the completion of the test (S12). In this case, the information notified to the exchange main body 5 based on the result of the test is OK when normal.
In case of abnormality, it is NG.

Upon receiving the test completion notice, the exchange main unit 5 notifies the office side line terminating device 3 of the test release request (S).
13). Upon receiving the test cancellation request, the station side circuit terminating device 3 notifies the subscriber side circuit terminating device 2 of the test cancellation request on the control channel of the line 4 (S14). Upon receiving this test cancellation request, the subscriber side line terminating device 2 releases the loop setting and shifts to the normal state (S15), and notifies the station side line terminating device 3 of a release completion response (S16). The second restart processing means 20 of the station side line terminating device 3 clears the in-test identifier saved in the memory (S17), and the station side line terminating device 3 notifies the exchange main body 5 of a release completion response. Yes (S18). In the exchange main body 5 which has received the release completion response from the station side line terminating device 3, the first restart processing means 10 clears the in-test identifier saved in the memory (S19), and the test mode shifts to the normal mode. .

Next, the operation of the present invention when the reopening occurs in the station side line terminating device 3 or the exchange main body 5 will be described. FIG. 3 is a sequence diagram showing an operation at the time of resuming the line terminating device on the station side. The operator has an operator console 6
When the test mode is set from the
The restart processing means 10 marks (saves) the identifier under test in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receipt of this test start request, the subscriber side line terminating device 2 completes the setting of the loopback and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that the station side line terminating device 3 receives the return frame from the subscriber side line terminating device 2 and then restarts due to a failure or the like (S10). In this case,
All data stored in the internal memory of the device is cleared. Therefore, the identifier under test is also cleared. The second restart processing means 20 which has recognized that the restart has occurred notifies the exchange main body 5 of the restart occurrence (S11). In the exchange main body 5 which has received the restart occurrence notification from the station side line terminating device 3, the first restart processing means 10 refers to the memory,
If it confirms that the identifier under test is saved, it recognizes that the restart is occurring during the test. Then, the test release request similar to the normal test release is notified to the station side line terminating device 3 (S12).

In the station side line terminating device 3, when the second restart processing means 20 receives this test release request, it notifies the subscriber side line terminating device 2 of the test release request on the control channel of the line 4. (S13). Subscriber side line termination device 2
Upon receipt of this test cancellation request, shifts to the normal state, that is, cancels the loop setting (S14), and notifies the station side line terminating device 3 of a cancellation completion response (S15).
In the station side line terminating device 3, when the second restart processing means 20 receives this release completion response, it notifies the exchange main body 5 of the release completion response (S16). In the exchange main body 5, when the first restart processing means 10 receives the release completion response, the in-test identifier saved in the memory is cleared (S1).
7) Transition to the normal state. According to this embodiment, when the station side line terminating device 3 is restarted, the states can be automatically matched and the test can be ended without contradiction.

FIG. 4 is a sequence diagram showing a first operation example when the main body of the exchange is restarted. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the in-test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal memory (S).
3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receipt of this test start request, the subscriber side line termination device 2 completes the setting of the loopback and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that, after the station side line terminating device 3 receives the loopback frame, a restart without affecting the station side line terminating device 3 occurs due to a failure in the exchange main body 5 (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier mark is also cleared. When the first restart processing means 10 detects the restart occurrence, it notifies the station side line terminating device 3 of the restart occurrence (S11). When the second restart processing means 20 of the station side line terminating device 3 receives this restart occurrence, it confirms the in-test identifier of the internal memory and notifies the exchange main body 5 of the test status with the test (S12). . The first restart processing means 10 of the exchange main body 5, which has received the test status notification, recognizes that the restart of the own device occurred during the test. Then, the test release request similar to the case of the normal test release is notified to the station side line terminating device 3 (S13).

In the station side line terminating device 3, when the second restart processing means 20 receives this test release request, it notifies the subscriber side line terminating device 2 of the test release request on the control channel of the line 4. (S14). Upon receiving the test cancellation request, the subscriber side line termination device 2 shifts to the normal state,
That is, the loop setting is released (S15), and the release completion response is notified to the station side line terminating device 3 (S16). When the second restart processing means 20 of the station side line terminating device 3 receives this release completion response, it clears the in-test identifier saved in the internal memory (S17) and sends a release completion response to the exchange main body 5. Is notified (S18). Upon receiving this test release response, the exchange main body 5 recognizes that the release of the test state has been completed. According to this embodiment, even when the exchange main body 5 is restarted, the states are automatically adjusted,
The test can be completed without conflict.

FIG. 5 is a sequence diagram showing a second operation example when the restart of the exchange main body occurs. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the in-test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal memory (S).
3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receipt of this test start request, the subscriber side line termination device 2 completes the setting of the loopback and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that, after the station side line terminating device 3 receives the return frame, a restart without affecting the station side line terminating device 3 occurs due to a failure in the exchange main body 5 (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier mark is also cleared. When the first restart processing means 10 detects the restart occurrence, it notifies the station side line terminating device 3 of the restart occurrence (S11). When the second restart processing means 20 of the station side line terminating device 3 receives this restart occurrence, it confirms the in-test identifier of the internal memory and notifies the exchange main body 5 of the test status with the test (S12). . The first restart processing means 10 of the exchange main body 5, which has received the test status notification, recognizes that the restart of the own device occurred during the test.

Therefore, the first restart processing means 10 again saves the identifier under test in the internal memory (S13). After that, the same operation as usual is performed. As a result, the station side line terminating device 3 continues the test as it is, and when the return frame is received from the subscriber side line terminating device 2, the received frame is checked and the test is completed (S14).
Next, the first restart processing means 10 of the station side line terminating device 3 sends a test completion notice to the exchange main body 5 (S1).
5). In this case, the information notified to the exchange main body 5 according to the result of the test is OK in the normal case and N in the abnormal case.
G.

First restart processing means 10 of the exchange main body 5
Upon receipt of the test completion notification, notifies the station side line terminating device 3 of the test cancellation request (S16). Station side line termination device 3
Upon receipt of this test cancellation request, the second restart processing means 20 notifies the subscriber side line termination device 2 of the test cancellation request on the control channel of the line 4 (S17). The subscriber side line termination device 2 that has received this test release request shifts to the normal state (S18), and notifies the station side line termination device 3 of a release completion response (S19). The second restart processing means 20 of the station side line terminating device 3 clears the in-test identifier saved in the memory (S20), and the station side line terminating device 3 notifies the exchange main body 5 of a release completion response. Yes (S21). In the exchange main body 5 which has received the release completion response from the station side line terminating device 3, the first restart processing means 10 clears the in-test identifier saved in the memory (S22), and the test mode shifts to the normal mode. . According to this embodiment, even if the exchange main body 5 is restarted, it is possible to automatically adjust the states and continue the test without any contradiction, and then finish the test without any contradiction.

FIG. 6 is a sequence diagram showing a third operation example when the exchange body restarts. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the in-test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal memory (S).
3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receiving this test start request, the subscriber side line termination device 2 completes the setting of the loop loop and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that, after the station side line terminating device 3 receives the return frame, a restart or the like which does not affect the station side line terminating device 3 occurs due to a failure in the exchange main body 5 (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier mark is also cleared. When the first restart processing means 10 detects the restart occurrence, it notifies the station side line terminating device 3 of the restart occurrence (S11). When the second restart processing means 20 of the station side line terminating device 3 that has received the restart occurrence notification recognizes that the in-test identifier is saved in the memory, it autonomously releases the test to the subscriber side line terminating device 2. The request is notified on the control channel of the line 4 (S12).

Upon receiving the test cancellation request, the subscriber side line termination device 2 cancels the loop setting that has been set and shifts to the normal state (S13). Next, the subscriber side line termination device 2 notifies the station side line termination device 3 of a release completion response (S14). The second restart processing means 20 of the subscriber side line terminating device 2, upon receiving this release completion response, clears the in-test identifier in the memory (S15). As a result, both the station side line terminating device 3 and the exchange main body 5 clear the in-test identifier in the memory, and enter the normal operation state. In this embodiment, the station side line terminating device 3 does not notify the exchange main body 5 of the cancellation completion response, but there is no problem because both in-test identifiers are cleared. According to this embodiment, when a restart occurs in the exchange main body 5, the states can be automatically matched and the test can be ended without contradiction.

FIG. 7 is a sequence diagram showing a fourth operation example when the restart of the exchange main body occurs. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal nonvolatile memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receipt of this test start request, the subscriber side line termination device 2 completes the setting of the loopback and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9). After the line terminating device 3 on the station side receives the return frame, the exchange main body 5 is damaged due to a failure or the like.
It is assumed that the station side line terminating device 3 is also restarted (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier is also cleared. The first restart processing means 10 sends a reset signal for restarting the station side line terminating device 3 to the station side line terminating device 3 (S11). As a result, the station side line terminating device 3 also restarts (S12). As a result, all the data stored in the memory of the station side line terminating device 3 is cleared, but only the in-test identifier is saved in the non-volatile memory and therefore not cleared.

Then, when the second resumption processing means 20 recognizes that the test is in progress by reading the test-in-progress identifier saved in the non-volatile memory (S13), the exchange main body 5 indicates that the test is in progress. Information is added and a restart occurrence notification is given (S14). First restart processing means 1 of the exchange main body 5
When 0 recognizes from the restart occurrence notification that the restart is occurring during the test, 0 notifies the station side line terminating device 3 of a test cancellation request similar to the normal test cancellation (S15). The second restart processing means 20 of the station side line terminating device 3 notifies the subscriber side line terminating device 2 of the received test release request on the control channel of the line 4 (S16). As a result, the subscriber side line termination device 2 releases the loop setting and shifts to the normal state (S17).

Next, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a release completion response (S1).
8). In the station side line terminating device 3, the second restart processing means 2
When 0 receives this release completion response, the in-test identifier saved in the non-volatile memory is cleared (S19),
The cancellation completion response is notified to the exchange main body 5 (S20). Upon receiving the cancellation completion response, the exchange main body 5 recognizes that the cancellation processing is completed and returns to the normal processing state. According to this embodiment, in the case where a restart that also restarts the office side line terminating device 3 occurs in the exchange main body 5 during the test, the second restart processing means 20 of the office side line terminating device 3 causes the exchange main body to restart after the restart. 5, the contents of the non-volatile memory are given to notify the presence / absence of the test before restart, and the first restart processing means 10 of the exchange main body 5 which has received the notification cancels the test if the test is present. By notifying the station side line terminating device 3 of the request and ending the test, it is possible to automatically match the states and end the test without contradiction.

FIG. 8 is a sequence diagram showing a fifth operation example when the restart of the exchange main body occurs. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal nonvolatile memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receiving this test start request, the subscriber side line termination device 2 completes the setting of the loop loop and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that, after the station side line terminating device 3 receives the loopback frame, a restart of the station side line terminating device 3 is restarted due to a failure in the exchange main body 5 (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier is also cleared.
The first restart processing means 10 sends a reset signal for restarting the station side line terminating device 3 to the station side line terminating device 3 (S11). As a result, the station side line termination device 3
However, restart occurs (S12). As a result, all the data stored in the memory of the station side line terminating device 3 is cleared, but only the in-test identifier is saved in the non-volatile memory and therefore not cleared.

Therefore, when the second restart processing means 20 recognizes that the test is in progress by reading the in-test identifier saved in the non-volatile memory (S13), the exchange main body 5 indicates that the test is in progress. Information is added and a restart occurrence notification is given (S14). In the exchange main body 5 which has received the notification of the occurrence of the restart during the test, the first restart processing means 10 saves the in-test identifier in the memory (S15). As a result, the same operation as usual is performed. That is, the first restart processing means 10 makes a test frame transmission request to the station side line terminating device 3 (S16). Receiving this test frame transmission request, the station side line terminating device 3 transmits a test frame to the subscriber side line terminating device 2 (S17) and performs a loopback test.

Upon receiving the test frame returned from the subscriber side line terminating device 2, the station side line terminating device 3 checks the normality of the operation by collating with the transmitted frame. This completes the test (S18). Next, the second restart processing means 20 of the station side line terminating device 3 sends a test completion notice to the exchange main body 5 (S19).
In this case, the information notified to the exchange main body 5 as a result of the test is OK in the normal case and NG in the abnormal case.

First restart processing means 10 of the exchange main body 5
Upon receipt of the test completion notification, notifies the station side line terminating device 3 of the test cancellation request (S20). Station side line termination device 3
Upon receipt of this test cancellation request, the second restart processing means 20 notifies the subscriber side line terminating device 2 of the test cancellation request on the control channel of the line 4 (S21). The subscriber-side line terminating device 2 that has received this test release request shifts to the normal state (S22) and notifies the station-side line terminating device 3 of a release completion response (S23). The second restart processing means 20 of the station side line terminating device 3 clears the in-test identifier saved in the non-volatile memory (S24), and notifies the exchange main body 5 of the release completion response (S25). In the exchange main body 5 which has received the release completion response from the station side line terminating device 3, the first restart processing means 10 clears the in-test identifier saved in the memory (S25), and the test mode shifts to the normal mode. . According to this embodiment, in the case where a restart for restarting the station side line terminating device 3 also occurs in the exchange main unit 5 during the test, the second restart processing means 20 of the station side line terminating device 3 causes the switch main unit 5 to resume after the restart. To the first restart processing means 10 of the exchange main body 5 which receives the notification of whether or not there is a test before restarting, by giving the saved contents of the nonvolatile memory to
When there is a test, by sending a test frame sending request to the station side line terminating device 3 and continuing the test, the states can be automatically matched and the test can be continued without contradiction.

FIG. 9 is a sequence diagram showing a sixth operation example when the main body of the exchange is restarted. When the operator sets the test mode from the operator console 6, the first restart processing means 10 of the exchange main body 5 marks (saves) the test identifier in the internal memory (S1). Next, the exchange main body 5 notifies the station side line terminating device 3 of the test start request (S2). The second restart processing means 20 of the station side line terminating device 3 saves the in-test identifier in the internal nonvolatile memory (S3). Next, the station side line terminating device 3 notifies the subscriber side line terminating device 2 of a test start request from the control channel (S4).

Upon receipt of this test start request, the subscriber side line termination device 2 completes the setting of the loopback and shifts to the test state (S5). After shifting to the test state, the subscriber side line terminating device 2 notifies the station side line terminating device 3 of a setting completion response (S6). The station side line terminating device 3 notifies the exchange main body 5 of the received setting completion response (S7).
Upon receiving the setting completion response, the exchange main body 5 notifies the station side line terminating device 3 of the request to send the test frame (S).
8). Upon receiving the test frame sending request, the station side line terminating device 3 sends a test frame to the subscriber side line terminating device 2 (S9).

It is assumed that, after the line terminating device 3 on the station side receives the return frame, a restart of the line terminating device 3 on the station side is restarted due to a failure in the exchange main body 5 (S10). At this time, all the data stored in the memory of the device is cleared. The in-test identifier is also cleared.
The first restart processing means 10 sends a reset signal for restarting the station side line terminating device 3 to the station side line terminating device 3 (S11). As a result, the station side line termination device 3
However, restart occurs (S12). As a result, all the data stored in the memory of the station side line terminating device 3 is cleared, but only the in-test identifier is saved in the non-volatile memory and therefore not cleared.

Therefore, when the second resumption processing means 20 reads out the in-test identifier saved in the non-volatile memory and recognizes that the test is in progress (S13), it autonomously operates the subscriber-side line termination device 2 To the test cancel request on the control channel of the line 4 (S14). The subscriber's line terminating device 2 that has received this test release request notification releases the loop setting and shifts to the normal state (S15). Then, the cancellation completion response is notified to the station side line terminating device 3 (S16). In the station side line terminating device 3, the second restart processing means 20 clears the in-test identifier saved in the memory (S17). In this embodiment, the station side line terminating device 3 does not notify the exchange main body 5 of a release completion response, but the station side line terminating device 3 and the exchange main body 5 both have the in-test identifiers cleared and are in the normal operation state. is there. Therefore, both sides are consistent and consistent. According to this embodiment, when a restart for restarting the station side line terminating device 3 also occurs in the exchange main body 5 during the test, the second resuming processing means 20 of the station side line terminating device 3 causes the non-volatile memory to operate. When it is confirmed that the identifier under test is saved in, the second restart processing means 20 of the station side line terminating device 3
By autonomously canceling the test status of the subscriber-side line termination device 2, the status can be automatically matched and the test can be ended without contradiction.

[0064]

As described above in detail, according to the present invention, the exchange main body 5 side is notified of the restart occurrence to the station side line terminating device 3 when the restart occurs, or the test cancellation process or the test continuation process. The first restart processing means 10 which performs the other processing associated with the restart occurrence is notified to the switch side main unit 5 of the restart occurrence when the restart occurs, or the test cancellation processing or the test. By providing the second restart processing means 20 for performing the continuous processing and the other processing associated with the occurrence of the restart, when the restart occurs at various points of the network, the state is automatically matched and tested. Can be terminated consistently or the test can be continued consistently.

In this case, a memory for storing an in-test identifier for identifying that the system is under test is provided in each of the exchange main body 5 and the station side line terminating device 3 so that the own device at the time of restart of the test can be obtained. The state of can be recognized.

When the station side line terminating device 3 is restarted during the test, the second resumption processing means 20 of the station side line terminating device 3 notifies the exchange main body 5 of the restart occurrence, and the exchange main body 5 is notified. When the first restart processing means 10 of 5 receives this restart occurrence notification and confirms that the in-test identifier is saved in the memory, it performs the test release procedure for the station side line terminating device 3, Tests can be completed consistently with automatic state matching.

When a restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 notifies the office side line terminating device 3 of the restart occurrence and receives the restart occurrence. When the second restart processing means 20 of the station side line terminating device 3 confirms that the in-test identifier is saved in the memory, it notifies the exchange main body 5 of the test status, and the first restart processing of the exchange main body 5 is performed. When the means 10 receives this test status notification, it performs the test cancellation procedure for the station side line terminating device 3 to automatically match the status and complete the test without contradiction.

When a restart occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5 notifies the office side line terminating device 3 of the restart occurrence, and the restart occurrence notification is issued. When the second restart processing means 20 of the station side line terminating device 3 confirms that the in-test identifier is saved in the memory, it notifies the exchange main body 5 of the test status, and the station side line terminating device 3 The test is continued, and after the test is finished, the second restart processing means 20 notifies the exchange main body 5 of the test completion notification, and the first restart processing means 1 of the exchange main body 5 is notified.
When 0 receives the test completion notification, it performs the test release procedure on the station side line terminating device 3 to automatically match the states and continue the test without any contradiction, and then terminate the test without any contradiction. it can.

Further, when restarting occurs in the exchange main body 5 during the test, the first restart processing means 10 of the exchange main body 5
Notifies the station side line terminating device 3 of the resumption occurrence, and the second resumption processing means 20 of the station side line terminating device 3 which has received the resumption confirmation confirms that the in-test identifier is saved in the memory. Then, by autonomously canceling the test of the subscriber-side circuit terminating device 2, it is possible to automatically match the states and complete the test without contradiction.

Further, during the test, in the case where a restart for restarting the station side line terminating device 3 also occurs in the exchange main body 5, the second restart processing means 20 of the station side line terminating device 3 causes the switch main body 5 to resume after the restart. When the test is present, the first restart processing means 10 of the exchange main body 5 which receives the notification of the presence / absence of the test before the restart by giving the saved contents of the nonvolatile memory to the test, issues a test cancellation request. By notifying the station side line terminating device 3 and ending the test, the states can be automatically matched and the test can be ended without contradiction.

Further, during the test, when a restart for restarting the station side line terminating device 3 also occurs in the exchange side main unit 5, the second resumption processing means 20 of the station side line terminating device 3 causes the exchange side main unit 5 to restart the above. The first restart processing means 10 of the exchange main body 5 which receives the notification of the presence or absence of the test before resuming by giving the saved contents of the non-volatile memory, sends a test frame transmission request when the test is present. By sending the signal to the side circuit terminating device 3 and continuing the test, the states can be automatically matched and the test can be continued without contradiction.

Further, during the test, if a restart for restarting the station side line terminating device 3 also occurs in the exchange main unit 5, the second restart processing means 20 of the station side line terminating device 3 causes the nonvolatile memory to perform a test. When it is confirmed that the medium identifier has been saved, the second restart processing means 20 of the station side line terminating device 3 autonomously releases the test state of the subscriber side line terminating device 2 to automatically set the state. Can be matched to complete the test consistently.

As described above, according to the present invention, when restarts occur at various points in the network, the states can be automatically matched to complete the test without a contradiction, or the test can be continued without a contradiction. A test system for a frame relay network can be provided, which has a great practical effect.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a diagram showing a sequence example of a normal operation of the present invention.

FIG. 3 is a sequence diagram showing an operation when a station-side line termination device restart occurs.

FIG. 4 is a sequence diagram showing a first operation example when a switching device main body restarts.

FIG. 5 is a sequence diagram showing a second operation example when the exchange body restarts.

FIG. 6 is a sequence diagram showing a third operation example when the exchange main body restarts.

FIG. 7 is a sequence diagram showing a fourth operation example when a restart of the exchange main body occurs.

FIG. 8 is a sequence diagram showing a fifth operation example when the exchange body restarts.

FIG. 9 is a sequence diagram showing a sixth operation example when a restart of the exchange main body occurs.

FIG. 10 is a conceptual diagram showing the configuration of a frame relay network.

FIG. 11 is a sequence diagram showing the operation of the conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Subscriber terminal 2 Subscriber side line terminating device 3 Station side line terminating device 3 4 Line 5 Switch body 6 Operator's console 10 First restart processing means 20 Second restart processing means

Claims (9)

[Claims] 1. A subscriber side line terminating device in a frame relay network, a station side line terminating device connected to the subscriber side line terminating device via a line, and an exchange main body for controlling the station side line terminating device. In the system configured as described above, in the exchange main body, when the restart occurs, the station side line terminating device is notified of the restart occurrence, or the test cancellation processing or the test continuation processing is performed and other processing associated with the restart occurrence is performed. The first restart processing means is configured to notify the switch main unit of the restart occurrence when the restart occurs, or to perform a test cancellation process or a test continuation process and other processes associated with the restart occurrence in the station side line termination device. A test system for a frame relay network, characterized in that it is provided with respective second restart processing means for performing. 2. The frame relay network according to claim 1, wherein a memory for storing an identifier under test for identifying that the system is under test is provided in each of the exchange main body and the line terminating device on the station side. Test system. 3. When the station side line terminating device puts the subscriber side line terminating device into a test state, the first restart processing means of the exchange main body saves the in-test identifier in the memory, and the station side line When restarting occurs in the terminating device, the second restart processing means of the station side line terminating device notifies the main switch unit of the restart occurrence, and the first restart processing means of the main switch unit receives this restart notification. 3. The frame relay network test system according to claim 2, wherein when it is confirmed that the identifier under test is saved in the memory, the test release procedure is performed on the station side line terminating device. 4. When the station-side line terminating device puts the subscriber-side line terminating device into a test state, the second restart processing means of the station-side line terminating device saves the test-in-progress identifier in the memory, and during the test. When the restart occurs in the exchange main body, the first restart processing means of the exchange main body notifies the station side line terminating device of the restart occurrence, and the second restart processing means of the station side line terminating device which receives the restart occurrence. Confirms that the identifier under test is saved in the memory, it sends a test status notification to the exchange main body, and when the first restart processing means of the exchange main body receives this test status notification, it sends to the station-side line termination device. The test system for a frame relay network according to claim 2, wherein a test cancellation procedure is performed. 5. When the station side line terminating device puts the subscriber side line terminating device into a test state, the second restart processing means of the station side line terminating device saves the in-test identifier in the memory, and the exchange during the test. When the restart occurs in the main body, the first restart processing means of the exchange main body notifies the office side line terminating device of the restart occurrence, and the second restart process of the office side line terminating device that receives the restart occurrence notification. When the means confirms that the identifier under test is saved in the memory, it sends a test status notification to the exchange main unit, the line terminating equipment on the station side continues the test, and after the test ends, the second restart processing means completes the test. 3. The frame relay network according to claim 2, wherein a notification is sent to the exchange main body, and the first restart processing means of the exchange main body performs a test release procedure on the station side line terminating device when the test completion notice is received. of Test system. 6. When the station-side line terminating device puts the subscriber-side line terminating device into a test state, the second restart processing means of the station-side line terminating device saves the test-in-progress identifier in the memory, and during the test. When resumption occurs in the exchange main body, the first resumption processing means of the exchange main body notifies the station side line terminating device of the resumption occurrence, and the second resumption process of the station side line terminating device which receives the resumption occurrence. 3. The frame relay network test system according to claim 2, wherein the means autonomously cancels the test of the subscriber side line terminating device when it is confirmed that the identifier under test is saved in the memory. 7. When the station-side line terminating device puts the subscriber-side line terminating device into a test state, the second restart processing means of the station-side line terminating device saves the test-in-progress identifier in the non-volatile memory and performs the test. In the case where a restart that also restarts the central office side line terminating equipment occurs in the exchange main body, the second restart processing means of the central office side line terminating equipment gives the saved contents of the nonvolatile memory to the main body of the exchange and restarts. If there is a test, the first restart processing means of the exchange main body, which notifies the presence or absence of the previous test, notifies the station side line terminating device of the test cancellation request and terminates the test. The frame relay network test system according to claim 2. 8. When the station side line terminating device sets the subscriber side line terminating device in the test state, the second restart processing means of the station side line terminating device saves the test-in-progress identifier in the non-volatile memory. In the case where a restart that also restarts the station side line terminating device in the exchange main unit occurs, the second restart processing means of the station side line terminating device adds the saved contents of the non-volatile memory to the exchange main unit after the restart and before restarting. If the test is present, the first restart processing means of the exchange main body, which has notified the presence or absence of the test, sends a test frame sending request to the station side line terminating device and continues the test. The frame relay network test system according to claim 2. 9. The second resumption processing means of the station side line terminating device saves the in-test identifier in the non-volatile memory when the station side line terminating device puts the subscriber side line terminating device into the test state, If a restart that also restarts the station side line terminating equipment occurs during the exchange main unit, the second restart processing means of the station side line terminating equipment confirms that the in-test identifier is saved in the nonvolatile memory. 3. The frame relay network test system according to claim 2, wherein the second restart processing means of the station side line terminating device autonomously cancels the test state of the subscriber side line terminating device.