JP7572078B2 - Continuity test device, continuity test method, and program - Google Patents

Description

This disclosure relates to a continuity test device, a continuity test method, and a program, and in particular to a continuity test device, a continuity test method, and a program that can detect the normality of data transmitted and received over a communication path and identify communication paths with incorrect connections using less test data.

When a fault occurs in a voice system such as a telephone exchange system or a media gateway system, it is an important requirement for telephone service to detect the occurrence of the fault and take measures to restore the system. There are various circuit examples that use pilot patterns to detect a fault in the system. However, there are few circuit examples for detecting misconnections to speech paths, and even when these circuits are used, it is often difficult to identify the misconnected speech path (suspected location) or investigate the cause. Therefore, for the maintenance and operation of the system, it is desirable to detect abnormalities in speech paths and identify the misconnected speech path (occurrence section).

Patent document 1, paragraph 0006, states that "the speech path device is interposed between the front-stage and rear-stage connection devices, the front-stage connection device includes a test data generation circuit and a test data insertion circuit, and the rear-stage connection device includes a test data check circuit." Also, patent document 1, paragraph 0007, states that "in the front-stage connection device, the test data "AA" and "55" are inserted alternately by the test data insertion circuit every frame period and transmitted onto the speech path device, and in the test data check circuit of the rear-stage connection device, the preset test data is compared with the test data on the control signal time slot received via the speech path device and the outgoing highway every frame period."

Japanese Patent Application Publication No. 11-068946

As mentioned above, it is desirable to detect abnormalities in speech paths and identify misconnected speech paths for system maintenance and operation. To achieve this, service data for calls is reduced and test data is inserted, which creates an issue of reduced storage efficiency of service data.

The objective of this disclosure is to provide a continuity test device, a continuity test method, and a program that solves any of the above-mentioned problems.

The continuity test device according to the present disclosure comprises:
for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
common fixed data is set in each of the first time slot to the n-th time slot of the first frame;
setting inverted fixed data obtained by inverting the common fixed data in each of the first time slot to the nth time slot of the second frame;
an nth destination slot number indicating a position in the own device where the nth destination card is installed and a source slot number indicating a position in the own device where the source card is installed are set in each of the time slots from the first time slot to the nth time slot of the third frame;
a transmitting unit that transmits the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the nth destination card,
comparing the common fixed data transmitted from the source card with an expected value of the common fixed data, and comparing the inverted fixed data with an expected value of the inverted fixed data to detect the normality of data transmitted and received on the nth speech path between the source card and the nth destination card;
a receiving unit for comparing the source slot number transmitted from the source card with an expected value of the source slot number and for comparing the nth destination slot number with an expected value of the nth destination slot number to identify a speech path having a misconnection;
Equipped with.

The continuity test method according to the present disclosure includes:
for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
setting common fixed data in each of the first time slot to the n-th time slot of a first frame;
setting inverted fixed data obtained by inverting the common fixed data in each of the first time slot to the nth time slot of a second frame;
setting an n-th destination slot number indicating a position in the own device where the n-th destination card is installed and a source slot number indicating a position in the own device where the source card is installed in each of the time slots from the first time slot to the n-th time slot of the third frame;
Transmitting the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the n-th destination card,
comparing the common fixed data transmitted from the source card with an expected value of the common fixed data, and comparing the inverted fixed data with an expected value of the inverted fixed data to detect the normality of data transmitted and received on the nth speech path between the source card and the nth destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, and comparing the nth destination slot number with an expected value of the nth destination slot number to identify a misconnected speech path;
Equipped with.

The program according to the present disclosure is
for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
setting common fixed data in each of the first time slot to the n-th time slot of a first frame;
setting inverted fixed data obtained by inverting the common fixed data in each of the first time slot to the nth time slot of a second frame;
setting an n-th destination slot number indicating a position in the own device where the n-th destination card is installed and a source slot number indicating a position in the own device where the source card is installed in each of the time slots from the first time slot to the n-th time slot of the third frame;
Transmitting the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the n-th destination card,
comparing the common fixed data transmitted from the source card with an expected value of the common fixed data, and comparing the inverted fixed data with an expected value of the inverted fixed data to detect the normality of data transmitted and received on the nth speech path between the source card and the nth destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, and comparing the nth destination slot number with an expected value of the nth destination slot number to identify a misconnected speech path;
to be executed by the computer.

The present disclosure provides a continuity test device, a continuity test method, and a program that can detect the normality of data transmitted and received over a communication path and identify communication paths with incorrect connections using less test data.

1 is a block diagram illustrating a continuity test device according to a first embodiment; 1 is a block diagram illustrating a functional block of a continuity test device according to a first embodiment; FIG. 4 is a diagram illustrating test data according to the first embodiment; 10 is a diagram illustrating a time slot configuration of transmission test data according to the first embodiment; FIG. 10 is a diagram illustrating a time slot configuration of reception test data according to the first embodiment; FIG. 10 is a diagram illustrating a time slot configuration of transmission test data according to the first embodiment; FIG. 10 is a diagram illustrating a time slot configuration of reception test data according to the first embodiment; FIG. FIG. 4 is a block diagram illustrating confirmation of a connection of a speech path according to the first embodiment. FIG. 4 is a block diagram illustrating confirmation of a connection of a speech path according to the first embodiment. 1 is a block diagram illustrating functional blocks of a continuity test device according to a comparative example of the first embodiment; FIG. 11 is a diagram illustrating test data according to the second embodiment.

Below, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding elements are given the same reference numerals, and duplicate explanations will be omitted as necessary to clarify the explanation.

[First embodiment]
<Outline of the configuration of the continuity test device>
FIG. 1 is a block diagram illustrating a continuity test device according to a first embodiment.
FIG. 1 shows a minimum configuration of a continuity test device according to a first embodiment.

As shown in FIG. 1, the continuity test device 11 according to the first embodiment includes a transmitting unit 111 and a receiving unit 112.

The transmitting unit 111 sets common fixed data in each of the time slots from the first time slot (1TS: Time Slot) to the nth time slot of the first frame in order to test the first to nth communication paths between the source card and each of the first to nth destination cards. Here, n is a natural number. The transmitting unit 111 sets inverted fixed data obtained by inverting the common fixed data in each of the time slots from the first time slot to the nth time slot of the second frame. The transmitting unit 111 sets the nth destination slot number indicating the position in the continuity test device 11 in which the nth destination card is implemented and the source slot number indicating the position in the continuity test device 11 in which the source card is implemented in each of the time slots from the first time slot to the nth time slot of the third frame. The transmitting unit 111 transmits the first to third frames from the first destination card to the nth destination card via the first to nth communication paths.

The transmitter 111 transmits the first frame first, the second frame second, and the third frame third.

The receiving unit 112 compares the common fixed data transmitted from the source card with the expected value of the common fixed data for each of the first destination card to the nth destination card. The receiving unit 112 compares the inverted fixed data with the expected value of the inverted fixed data. The receiving unit 112 detects the normality of the data transmitted over the nth channel between the source card and the nth destination card based on the comparison result. The receiving unit 112 compares the source slot number transmitted from the source card with the expected value of the source slot number. The receiving unit 112 compares the nth destination slot number transmitted from the source card with the expected value of the nth destination slot number. The receiving unit 112 identifies the incorrectly connected channel based on the comparison result. The common fixed data, inverted fixed data, nth destination slot number, and source slot number used for testing the first channel to the nth channel are referred to as test data.

The continuity test device 11 according to the first embodiment uses common fixed data and inverted fixed data as test data and changes all bits of the test data, making it possible to detect bit errors such as when a specific bit fails while remaining at a fixed value. This makes it possible to detect the normality of data transmitted and received over a speech path. As a result, according to the first embodiment, it is possible to provide a continuity test device, a continuity test method, and a program capable of detecting the normality of data transmitted and received over a speech path.

In addition, the continuity test device 11 according to the first embodiment uses the source slot number and destination slot number as test data to compare expected values, and is therefore able to detect a misconnection and further identify which source card the abnormality (misconnection) occurred between. As a result, according to the first embodiment, it is possible to provide a continuity test device, a continuity test method, and a program that are capable of identifying a misconnected communication path.

In addition, in the continuity test device 11 according to the first embodiment, for example, when n=2, the number of time slots used for the test data is two per frame. This is half the number of test data used in the comparative example described below. As a result, according to the first embodiment, it is possible to provide a continuity test device, a continuity test method, and a program that can detect the normality of data transmitted and received on a communication path and identify a communication path with a misconnection using less test data.

In addition, the continuity test device 11 according to the first embodiment can use more service time slots for services, thereby improving the storage efficiency of service data.

<Details of the configuration of the continuity test device>
FIG. 2 is a block diagram illustrating functional blocks of the continuity test device according to the first embodiment.
Each functional block shown in FIG. 2 includes the transmitting unit 111 and the receiving unit 112 shown in FIG.

As shown in FIG. 2, in the first embodiment, the transmitting side functional blocks (functional blocks 101 and 103) and the receiving side functional blocks (functional blocks 102 and 104) are connected via switch 107. Functional block 101 is included in source card 101c. Functional block 102 is included in destination card 102c. Functional block 103 is included in source card 103c. Functional block 104 is included in destination card 104c.

In the first embodiment, some of the time slots for transmitting and receiving service data (call data) are used as test time slots for transmitting and receiving test data. The normality of the test data is confirmed by transmitting and receiving the test data using the test time slots. This confirms the normality of the speech path. One test time slot is used for each speech path (direction) to confirm the normality of the speech path, and only one time slot is used for the opposing speech path. For multiple test time slots, the switch 107 individually sets up the speech path connection with the opposing destination, and the test data used to check for incorrect connection of the speech path is different data for each.

The test data for checking the normality of the speech path is common fixed data, and may be, for example, hexadecimal 55. The test data for checking the normality of the speech path is inverted fixed data, and may be, for example, hexadecimal AA. The test data for identifying a misconnected speech path may be different for each destination card (each speech path). The test data for identifying a misconnected speech path is, for example, the source slot number and source slot number of the speech path.

<Operation of the continuity test device>
FIG. 3 is a diagram illustrating test data according to the first embodiment.
FIG. 4 is a diagram illustrating a time slot configuration of transmission test data according to the first embodiment.
FIG. 4 shows the time slot configuration of the transmission test data of the source card 101c installed in slot number 1.
FIG. 5 is a diagram illustrating a time slot configuration of reception test data according to the first embodiment.
FIG. 5 shows the time slot configuration of the receiving test data of the destination card 102c installed in slot number 2.

FIG. 6 is a diagram illustrating a time slot configuration of transmission test data according to the first embodiment.
FIG. 6 shows a time slot configuration of the transmission test data of the source card 103c installed in slot number 3. In FIG.
FIG. 7 is a diagram illustrating a time slot configuration of reception test data according to the first embodiment.
FIG. 7 shows the time slot configuration of the receiving test data of the destination card 104c installed in slot number 4.

As shown in Figures 3 to 7, the source card uses 3 multi-frame data as the test data to be used in the test time slot. The source card sets the same test data for all communication paths in the test data for the first frame. The source card sets the same test data for all communication paths in the test data for the second frame, which is different from the test data for the first frame. The source card sets different test data for each communication path (path) in the test data for the third frame. The first frame is sometimes called the first frame, the second frame the second frame, and the third frame the third frame.

Specifically, the source card sets "55" in the first frame, "AA" in the second frame, and "XY" in the third frame. The source card sets the destination slot number (e.g., any one of 0 to 15) in hexadecimal to "X," and sets the source slot number (e.g., any one of 0 to 15) in hexadecimal to "Y."

For example, if the source card is installed in slot number 1 and the destination card is installed in slot number 2, the source card sets "XY" to "21". If the source card is installed in slot number 1 and the destination card is installed in slot number 4, the source card sets "XY" to "41". The source card then repeatedly transmits data from the first frame to the third frame. In this way, by treating the three multi-frame data from the first frame to the third frame as one piece of data for the test time slot, it is possible to test one communication path (direction) in one time slot.

The destination card receiving the test data checks each test time slot, since test data from a different source card is stored in each test time slot. The destination card checks the test data in three multiframes. Different test data is set for the test data in the third frame (test data for detecting incorrect connection of communication paths) for each communication path (direction).

Specifically, the destination card confirms that common fixed data, for example "55", is set in the first frame. The destination card confirms that inverted fixed data, for example "AA", is set in the second frame. If the common fixed data matches the expected value of the common fixed data and the inverted fixed data matches the expected value of the inverted fixed data, the destination card detects that the data being sent and received on the speech path is normal.

The destination card checks against the expected value to confirm that "XY" is set in the third frame. The destination card confirms that "X" is set to the destination slot number (the slot number of the receiving card) and that "Y" is set to the source slot number.

For example, if the destination card is installed in slot number 2, the source card is installed in slot number 1, and the destination card receives the test data sent from the source card, the destination card will confirm that "XY" is "21". Also, if the destination card is installed in slot number 4, the source card is installed in slot number 1, and the destination card receives the test data sent from the source card, the destination card will confirm that "XY" is "41". Then, the destination card will repeatedly check the data from the first frame to the third frame.

The test data "55" in the first frame and "AA" in the second frame change all eight bits, making it possible to detect bit errors such as when a specific bit fails and remains at a fixed value.

If the destination slot number or source slot number of the test data "XY" in the third frame differs from the expected value, the destination card can determine that the desired connection is not established, and can detect an incorrect connection.

In this way, the source card sets different test data for each destination of the speech path, and the destination card checks each one, making it possible to check the normality of the test data sent and received on the speech path and detect incorrect connections of the speech path.

FIG. 8 is a block diagram illustrating confirmation of connection of a speech path according to the first embodiment.
FIG. 8 shows the normal state.
FIG. 9 is a block diagram illustrating confirmation of connection of a speech path according to the first embodiment.
FIG. 9 shows the case of abnormality detection (detection of incorrect connection).

As shown in Figure 8, in a normal state, when the destination card checks the test data against the expected value, the test data matches the expected value, and the connection status of the communication path is determined to be normal.

If the destination card is in an abnormal state, for example, if the source slot number does not match the expected value of the source slot number, or if the destination slot number does not match the expected value of the destination slot number, the destination card identifies the erroneously connected communication path as the communication path between the source card installed in the transmitted source slot number and the destination card installed in the transmitted destination slot number.

As shown in Figure 9, in the case of an abnormal state, the communication path from the source card installed in slot number 3 to the destination card installed in slot number 2 is not connected, and the communication path from the source card installed in slot number 5 to the destination card installed in slot number 2 is incorrectly connected. In other words, Figure 9 shows a state in which the test data has been swapped due to an incorrect source card.

In a normal state, test data with "23" set in the third frame should have been sent from the source card installed in slot number 3 to the destination card installed in slot number 2. However, due to an incorrect connection, the destination card detected "25" as the test data in the third frame. In this case, a mismatch occurs because the measured value in the third frame is "25" and the expected value is "23." This causes the destination card (the card that receives the test data) to detect an incorrect connection. Furthermore, the destination card can determine that an abnormality has occurred between it and the source card installed in source slot number 5, based on the test data of "25" (destination slot number 2, source slot number 5) when the abnormality was detected.

The destination card may receive the third frame if the common fixed data matches the expected value of the common fixed data and if the inverted fixed data matches the expected value of the inverted fixed data.

＜Effects＞
The continuity test device 11 according to the first embodiment performs test data for checking the normality of a speech path in a system that handles voice, with one time slot per speech path (path). This allows the continuity test device 11 to use more service time slots for services, thereby improving the storage efficiency of service data.

The continuity test device 11 according to the first embodiment detects (confirms) whether or not there is a misconnection by comparing expected values based on the destination slot number and source slot number used as test data. Therefore, when the continuity test device 11 detects a misconnection, it can determine which slot number the card is mounted in based on the contents of the confirmed test data, and can therefore identify the communication path of the misconnection (suspected location).

As a result, according to the first embodiment, it is possible to provide a continuity test device, a continuity test method, and a program that can detect the normality of data transmitted and received over a communication path and identify communication paths with incorrect connections using less test data.

<Features>
Here, the features of the first embodiment will be described below.
In voice-based systems such as telephone exchange systems and media gateway systems that enable the exchange of voice data over IP (Internet Protocol) networks, many systems are provided with a function for detecting the occurrence of a fault in the system and taking recovery measures to enable the continuation of services. In particular, the communication path through which voice data flows is where users directly feel the quality of telephone services, and it is necessary to ensure the quality of service by reliably detecting and dealing with the occurrence of abnormal data due to various factors or erroneous connection with other communication paths. The first embodiment relates to a continuity test for the purpose of detecting the normality of data transmitted and received over the communication path (normality of the communication path) and erroneous connection with other communication paths in such voice-based systems.

[Comparative Example]
FIG. 10 is a block diagram illustrating functional blocks of a continuity test device according to a comparative example of the first embodiment.
FIG. 10 shows an example of transmitting test data from the functional block of slot number 1 to the functional block of slot number 2 and the functional block of slot number 4 via switch 507, and from the functional block of slot number 3 to the functional block of slot number 2 and the functional block of slot number 4.

As shown in FIG. 10, the continuity test device 51 in the comparative example inserts test data into a test time slot in the function block of the source card, and checks the test data inserted into the test time slot in the function block of the destination card. In this way, the continuity test device 51 checks the normality of the test data. When checking the test data, the continuity test device 51 uses two time slots for each communication path to check the normality.

In the first time slot, the continuity test device 51 uses different data for each opposing slot to compare the expected value with the destination card (receiving side), and if a mismatch is detected, it determines that there is an erroneous connection. In the second time slot, the continuity test device 51 sets inverted data that is the inverse of the first data, and detects bit errors by checking the first and second time slots. In the comparative example, when testing multiple communication paths, twice as many test time slots are required as communication paths. For this reason, as the number of communication paths increases, it becomes necessary to limit the number of service time slots used for the service, which reduces the storage efficiency of service data (communication data).

As a result, according to the comparative example, it is difficult to provide a continuity test device, a continuity test method, and a program that can detect the normality of data transmitted and received on a communication path and identify a communication path with a misconnection using less test data.

[Embodiment 2]
FIG. 11 is a diagram illustrating test data according to the second embodiment.
As shown in Fig. 11, in the second embodiment, the test data used in the test time slot sets hexadecimal "FF" in the first frame as a flag signal indicating the beginning of a multiframe. The test data according to the second embodiment sets the destination slot number and the source slot number in the second frame. The test data according to the second embodiment sets the destination slot number and the inverted data of the source slot number in the third frame. The destination card checks the three multiframe data from the first frame to the third frame.

In the above embodiment, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also be realized by having a CPU (Central Processing Unit) execute a computer program to process each component.

In the above embodiment, the program can be stored and supplied to the computer using various types of non-transitory computer readable media. The non-transitory computer readable media includes various types of tangible storage media. Examples of the non-transitory computer readable media include magnetic recording media (specifically, flexible disks, magnetic tapes, and hard disk drives), magneto-optical recording media (specifically, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R/Ws, semiconductor memories (specifically, mask ROMs, PROMs (Programmable ROMs), EPROMs (Erasable PROMs)), flash ROMs, and RAMs (Random Access Memory). The program may also be supplied to the computer by various types of transitory computer readable media. Examples of the transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer readable media can supply the program to the computer via wired communication paths such as electric wires and optical fibers, or wireless communication paths.

Furthermore, although operations are depicted in a particular order, this should not be understood as requiring such operations to be performed in the particular order or sequential order depicted, or that all of the depicted operations be performed, to achieve desired results. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although details of several specific embodiments are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable combination.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

The present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit and scope of the invention.

11, 51: Continuity test device 101, 102, 103, 104, 105: Functional blocks 101c, 102c, 103c, 104c, 105c: Cards 107, 507: Switch 111: Transmitter 112: Receiver

Claims (8)

for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
setting first common fixed data in each of the first time slot to the n-th time slot of the first frame;
setting second common fixed data in each of the time slots from the first time slot to the nth time slot of the second frame;
an nth destination slot number indicating a position in the own device where the nth destination card is installed and a source slot number indicating a position in the own device where the source card is installed are set in each of the time slots from the first time slot to the nth time slot of the third frame;
a transmitting unit that transmits the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the nth destination card,
comparing the first common fixed data transmitted from the source card with an expected value of the first common fixed data, and comparing the second common fixed data with an expected value of the second common fixed data, thereby detecting the normality of data transmitted and received on the nth speech path between the source card and the nth destination card;
a receiving unit for comparing the source slot number transmitted from the source card with an expected value of the source slot number and for comparing the nth destination slot number with an expected value of the nth destination slot number to identify a speech path having a misconnection;
Equipped with
the second common fixed data is different from the first common fixed data,
the second common fixed data is not an inverted version of the first common fixed data;
Continuity test equipment. the receiving unit detects that the data transmitted and received through the nth channel is normal when the first common fixed data matches an expected value of the first common fixed data and the second common fixed data matches an expected value of the second common fixed data;
2. The continuity test device according to claim 1. when the source slot number does not match an expected value of the source slot number, or when the nth destination slot number does not match an expected value of the nth destination slot number, the receiving unit identifies the erroneously connected speech path as the speech path between the source card installed in the transmitted source slot number and the destination card installed in the transmitted destination slot number.
3. The continuity test device according to claim 1 or 2. the receiving unit receives the third frame when the first common fixed data and an expected value of the first common fixed data match and the second common fixed data and an expected value of the second common fixed data match.
4. The continuity test device according to claim 1. the transmitting unit repeats transmission of the first frame to the third frame;
5. The continuity test device according to claim 1. each of the first frame, the second frame, and the third frame includes data for a service for a call;
6. A continuity test device according to claim 1. for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
setting first common fixed data in each of the first time slot to the n-th time slot of a first frame;
setting second common fixed data in each of the time slots from the first time slot to the nth time slot of a second frame;
setting an n-th destination slot number indicating a position in the own device where the n-th destination card is installed and a source slot number indicating a position in the own device where the source card is installed in each of the time slots from the first time slot to the n-th time slot of the third frame;
Transmitting the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the n-th destination card,
comparing the first common fixed data transmitted from the transmitting card with an expected value of the first common fixed data, and comparing the second common fixed data with an expected value of the second common fixed data, thereby detecting the normality of data transmitted and received on the nth speech path between the transmitting card and the nth destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, and comparing the nth destination slot number with an expected value of the nth destination slot number to identify a misconnected speech path;
Equipped with
the second common fixed data is different from the first common fixed data,
the second common fixed data is not an inverted version of the first common fixed data;
Continuity test method. for testing first through n-th communication paths between the source card and each of the first through n-th communication paths, where n is a natural number;
setting first common fixed data in each of the first time slot to the n-th time slot of a first frame;
setting second common fixed data in each of the time slots from the first time slot to the nth time slot of a second frame;
setting an n-th destination slot number indicating a position in the own device where the n-th destination card is installed and a source slot number indicating a position in the own device where the source card is installed in each of the time slots from the first time slot to the n-th time slot of the third frame;
Transmitting the first frame to the third frame from the first destination card to the nth destination card via the first communication path to the nth communication path;
In each of the first destination card to the n-th destination card,
comparing the first common fixed data transmitted from the transmitting card with an expected value of the first common fixed data, and comparing the second common fixed data with an expected value of the second common fixed data, thereby detecting the normality of data transmitted and received on the nth speech path between the transmitting card and the nth destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, and comparing the nth destination slot number with an expected value of the nth destination slot number to identify a misconnected speech path;
Run the following on your computer :
the second common fixed data is different from the first common fixed data,
the second common fixed data is not an inverted version of the first common fixed data;
program.

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