JP7302886B2 - Continuity test device, continuity test method, and program - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a continuity test apparatus, a continuity test method, and a program. relates to a continuity test device, a continuity test method, and a program that can be performed in

2. Description of the Related Art In a voice system such as a telephone exchange system or a media gateway system, it is an important requirement for telephone services to detect the failure and take recovery measures when the system fails. There are various circuit examples that use pilot patterns to detect when a fault has occurred in the system. However, there are few examples of circuits for detecting erroneous connection with a speech path, and even with those circuits, it is often difficult to identify the speech path (suspected part) of the erroneous connection and to investigate the cause. Therefore, for system maintenance and operation, it is desired to detect communication path abnormalities and to specify incorrectly connected communication paths (occurrence sections).

In paragraph 0006 of Patent Document 1, it is stated that "the communication path device is interposed between the front-stage and rear-stage connection devices. Each circuit is configured to be included." Further, in paragraph 0007 of Patent Document 1, it is stated that "in the preceding-stage connection device, the test data "AA" and "55" are alternately inserted by the test data insertion circuit in each frame period, and then transmitted to the channel device. In the test data check circuit of the post-connection device, the preset test data and the test data on the control signal time slot received via the communication path equipment and the outgoing highway are compared and collated every frame period. Are listed.

JP-A-11-068946

As described above, it is desirable to detect path anomalies and identify misconnected paths for system maintenance and operation. Therefore, since the service data for the call is reduced and the test data is inserted, there is a problem that the accommodation efficiency of the service data is lowered.

An object of the present disclosure is to provide a continuity test device, a continuity test method, and a program that solve any of the problems described above.

The continuity test device according to the present disclosure is
for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of the second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. set the transmission source slot number that indicates the position within the device itself,
a transmitting unit configured to transmit the first frame to the third frame from the first destination card to the n-th destination card via the first channel to the n-th channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from the destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, a receiver that identifies a misconnected speech path;
Prepare.

The continuity test method according to the present disclosure is
for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of a second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. setting a transmission source slot number that indicates the position within the own device that has been received;
transmitting the first frame to the third frame from the first destination card to the nth destination card via the first channel to the nth channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from a destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, identifying misconnected call paths;
Prepare.

The program according to the present disclosure is
for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of a second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. setting a transmission source slot number that indicates the position within the own device that has been received;
transmitting the first frame to the third frame from the first destination card to the nth destination card via the first channel to the nth channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from a destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, identifying misconnected call paths;
run on the computer.

According to the present disclosure, a continuity test device, a continuity test method, and a continuity test method capable of detecting the normality of data transmitted and received on a communication path and identifying an erroneously connected communication path with less test data program can be provided.

1 is a block diagram illustrating a continuity test device according to Embodiment 1; FIG. 2 is a block diagram illustrating functional blocks of the continuity testing device according to Embodiment 1; FIG. 4 is a diagram illustrating test data according to Embodiment 1; FIG. 4 is a diagram illustrating a time slot configuration of transmission test data according to Embodiment 1; FIG. 4 is a diagram illustrating a time slot configuration of reception test data according to Embodiment 1; FIG. 4 is a diagram illustrating a time slot configuration of transmission test data according to Embodiment 1; FIG. 4 is a diagram illustrating a time slot configuration of reception test data according to Embodiment 1; FIG. 4 is a block diagram illustrating confirmation of connection of a communication path according to Embodiment 1; FIG. 4 is a block diagram illustrating confirmation of connection of a communication path according to Embodiment 1; FIG. 3 is a block diagram illustrating functional blocks of a continuity test device according to a comparative example of the first embodiment; FIG. FIG. 10 is a diagram illustrating test data according to the second embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same reference numerals are given to the same or corresponding elements, and redundant description will be omitted as necessary for clarity of description.

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

As shown in FIG. 1 , continuity testing apparatus 11 according to Embodiment 1 includes transmitting section 111 and receiving section 112 .

Transmitter 111 uses the first time slot ( Common fixed data is set for each time slot from 1TS (Time Slot) to the n-th time slot. However, n is a natural number. The transmitting unit 111 sets inverted fixed data obtained by inverting the common fixed data in each time slot from the first time slot to the n-th time slot of the second frame. The transmitting unit 111 transmits the n-th destination slot number indicating the position in the continuity testing device 11 in which the n-th destination card is mounted in each time slot from the first time slot to the n-th time slot of the third frame. A source slot number indicating the position in the continuity tester 11 in which the source card is mounted is set. The transmission 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 in each of the first to n-th destination cards. 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/received on the n-th channel between the source card and the n-th destination card based on the collation 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 n-th destination slot number transmitted from the source card with the expected value of the n-th destination slot number. The receiving unit 112 identifies the erroneously connected speech path based on the collation result. Common fixed data, inverted fixed data, n-th transmission destination slot number, and transmission source slot number used for testing the first to n-th communication paths are referred to as test data.

The continuity tester 11 according to the first embodiment uses common fixed data and inverted fixed data as test data and changes all the bits of the test data. bit errors can be detected. This makes it possible to detect the normality of the data transmitted and received through the channel. As a result, according to Embodiment 1, 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 on a communication channel.

Further, the continuity tester 11 according to the first embodiment uses the transmission source slot number and the transmission destination slot number as test data to perform expected value collation. It is possible to identify whether an abnormality (erroneous connection) has occurred with the source card. 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 identifying an erroneously connected speech path.

Further, in the continuity testing apparatus 11 according to the first embodiment, for example, when n=2, the number of time slots used for test data is two per frame. This is half the number of test data used in comparative examples described later. As a result, according to the first embodiment, it is possible to detect the normality of the data transmitted and received on the speech path and to identify the misconnected speech path with less test data. A test apparatus, a continuity test method, and a program can be provided.

Further, since the continuity testing apparatus 11 according to Embodiment 1 can use more service time slots for service, it is possible to improve the accommodation 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 testing device according to the first embodiment.
Each functional block shown in FIG. 2 includes the transmitter 111 and the receiver 112 shown in FIG.

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

In Embodiment 1, part of the time slots for transmitting/receiving service data (call data) are used as test time slots for transmitting/receiving test data. Confirm the normality of the test data by transmitting and receiving the test data using the test time slot. This confirms the normality of the communication path. One time slot is used for one communication path (direction) as a test time slot for checking the normality of the communication path, and only the opposite communication path is used. A plurality of test time slots are connected to each other in a one-to-one mesh manner by individually setting the connection of the channel with the switch 107, and the test data used for checking the erroneous connection of the channel. use different data.

The test data for confirming the normality of the communication path is common fixed data, and may be hexadecimal 55, for example. Also, the test data for confirming the normality of the communication path may be inverted fixed data, such as hexadecimal AA. Also, the test data for identifying the erroneously connected speech path may be different for each connection destination card (for each speech path). The test data for specifying the erroneously connected channel is, for example, the source slot number and the source slot number of the channel.

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

6 is a diagram illustrating a time slot configuration of transmission test data according to Embodiment 1. FIG.
FIG. 6 shows the time slot configuration of the transmission test data of the transmission source card 103c mounted in slot number 3. As shown in FIG.
7 is a diagram exemplifying a time slot configuration of reception test data according to Embodiment 1. FIG.
FIG. 7 shows the time slot structure of the reception test data of the destination card 104c mounted in slot number 4. As shown in FIG.

As shown in FIGS. 3 to 7, the source card uses 3-multiframe data as test data for test time slots. The transmission source card sets the same test data for all channels in the first frame of test data. The source card sets the test data of the second frame to the same test data for all channels, which is different from the test data of the first frame. The source card sets different test data for each channel (direction) in the third frame of test data. The first frame may be called the first frame, the second frame may be called the second frame, and the third frame may be called 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 (for example, any one number from 0 to 15) in "X" in hexadecimal, and sets the source slot number (for example, any one from 0 to 15) in "Y". 1 number) in hexadecimal.

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 "21" to "XY". If the source card is mounted in slot number 1 and the destination card is mounted in slot number 4, the source card sets "41" to "XY". Then, the source card repeatedly transmits data from the first frame to the third frame. In this way, by using three multiframe data from the first frame to the third frame as one piece of test time slot, it is possible to test one channel (direction) in one time slot. .

Since test data from different source cards are stored in each test time slot, the destination card that receives the test data checks each time slot. The destination card verifies the test data for 3 multiframes. The test data of the third frame (test data for detecting erroneous connection of the communication path) is set with different test data for each communication path (direction).

Specifically, the destination card confirms that, for example, "55" is set as common fixed data in the first frame. The destination card confirms that "AA" is set as the inverted fixed data in the second frame. When the common fixed data matches the expected value of the common fixed data and the expected value of the inverted fixed data matches the expected value of the inverted fixed data, the destination card detects that the data transmitted and received on the channel is normal.

The destination card confirms that "XY" is set in the third frame by comparing expected values. The destination card confirms that the destination slot number (slot number of the received card) is set in "X" and the source slot number is set in "Y".

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 read "XY ” is “21”. Also, when the destination card is mounted in slot number 4, the source card is mounted in slot number 1, and the destination card receives the test data transmitted from the source card, the destination card is set to "XY ” is “41”. Then, the destination card repeatedly confirms the data of the first to third frames.

By changing all 8 bits of the test data of "55" in the first frame and "AA" in the second frame, it is possible to detect bit errors, such as when a specific bit fails with a fixed value. can be done.

If the destination slot number or the source slot number of the test data of "XY" in the 3rd frame is different from the expected value, the destination card can determine that the desired connection is not established, and thus there is an erroneous connection. can be detected.

In this way, the source card sets different test data for each connection destination of the call path, and the destination card confirms the data for each of them, thereby confirming the normality of the test data for sending and receiving the call path and Misconnections can be detected.

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

As shown in FIG. 8, in the normal state, when the destination card confirms the test data by comparing the expected value, the test data matches the expected value, so the connection state of the communication path is normal. I judge.

When the destination card is in an abnormal state, for example, when the destination slot number and the expected value of the destination slot number do not match, or when the destination slot number and the expected value of the destination slot number do not match, A misconnected channel is identified as a channel 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 FIG. 9, in the abnormal state, the communication path from the source card mounted in slot number 3 to the destination card mounted in slot number 2 is not connected, and the transmission line mounted in slot number 5 is not connected. The communication path from the source card to the destination card mounted in slot number 2 is incorrectly connected. That is, FIG. 9 shows a state in which the test data is replaced because the sender card is incorrect.

In the normal state, test data with "23" set in the third frame should have been transmitted from the source card mounted in slot number 3 to the destination card mounted in slot number 2. . However, due to the incorrect connection, the destination card detected "25" as test data in the third frame. In this case, since the measured value of the third frame is "25" and the expected value is "23", a mismatch occurs. As a result, the destination card (the card that receives the test data) detects an erroneous connection. Also, the destination card is connected to the source card mounted in the source slot number 5 based on the test data "25" (destination slot number 2, source slot number 5) when the abnormality is detected. It can be determined that an abnormality has occurred between them.

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

<effect>
The continuity tester 11 according to the first embodiment performs test data for confirming the normality of communication paths in one time slot per communication path (direction) in a system handling voice. As a result, the continuity tester 11 can use more service time slots for service, and can improve the accommodation efficiency of service data.

Further, the continuity testing apparatus 11 according to the first embodiment performs expected value collation based on the transmission destination slot number and the transmission source slot number used as test data, and detects (confirms) whether or not there is an erroneous connection. )do. Therefore, when detecting an erroneous connection, the continuity tester 11 can determine which slot number the card mounted in which the erroneous connection occurred based on the content of the confirmed test data. It is possible to identify the channel (suspected point) of the

As a result, according to the first embodiment, the continuity test device is capable of detecting the normality of the data transmitted and received on the communication path and identifying the misconnected communication path with less test data. A continuity test method and program can be provided.

<Features>
Here, features of Embodiment 1 are described below.
In the voice system of the media gateway system, which enables the exchange of voice data on the telephone exchange system or IP (Internet Protocol) network, when a failure occurs in the system, the failure is detected and recovery measures are taken. Many of them are equipped with functions to enable services to continue. In particular, voice data flows through communication paths, where users directly feel the quality of telephone service. It is necessary to ensure service quality by reliably detecting and dealing with anomalies. Embodiment 1 relates to a continuity test for the purpose of detecting the normality of data sent and received through a communication path (normality of a communication path) and erroneous connection with another communication path in such a voice system. .

[Comparative example]
10 is a block diagram illustrating functional blocks of a continuity test device according to a comparative example of the first embodiment; FIG.
FIG. 10 shows the functional block of slot number 1 to the functional block of slot number 2 and the functional block of slot number 4 through the switch 507, and the functional block of slot number 3 to the functional block of slot number 2 and the function of slot number 4. An example of transmitting test data to each block is shown.

As shown in FIG. 10, the continuity tester 51 according to the comparative example inserts test data into the test time slot in the function block of the transmission source card, and inserts test data into the test time slot in the function block of the destination card. Check the test data. Thereby, the continuity test device 51 confirms the normality of the test data. The continuity tester 51 confirms normality by using two time slots for each channel when confirming test data.

In the first time slot, the continuity tester 51 uses different data for each opposing slot to compare expected values on the destination card (receiving side), and if a mismatch is detected, it determines that there is an erroneous connection. . The continuity tester 51 sets inverted data obtained by inverting the first data in the second time slot, and detects bit errors by checking the first and second time slots. In the comparative example, when testing a plurality of communication paths, the test time slots are required for twice the number of communication paths. For this reason, when the number of communication paths increases, it is necessary to limit the number of service time slots used for services, and the accommodation efficiency of service data (call data) decreases.

As a result, according to the comparative example, it is possible to detect the normality of the data sent and received on the communication channel and to identify the communication channel that is erroneously connected with less test data. It is difficult to provide methods and programs.

[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" as a flag signal indicating the beginning of the multiframe in the first frame. The test data according to the second embodiment sets the destination slot number and the transmission source slot number in the second frame. In the test data according to the second embodiment, the transmission destination slot number and the inverted data of the transmission source slot number are set in the third frame. The destination card confirms the 3 multiframe data from the 1st frame to the 3rd frame.

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

In the above embodiments, the programs can be stored and delivered to computers using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (specifically flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (specifically magneto-optical discs), CD-ROMs (Read Only Memory ), CD-R, CD-R/W, semiconductor memory (specifically, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM)), flash ROM, and RAM (Random Access Memory). The program may also be delivered to the computer on various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.

Further, although acts have been depicted in a particular order, this does not mean that such acts are performed in the specific order or sequential order shown, or It should not be understood as requiring that all actions be performed. Multitasking and parallelism can be advantageous in certain situations. Similarly, while details of several specific embodiments have been included in the above discussion, these should not be construed as limitations on the scope of this disclosure, but as illustrations of features unique to those particular embodiments. should. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable combination.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.

11, 51: continuity test device 101, 102, 103, 104, 105: functional block 101c, 102c, 103c, 104c, 105c: card 107, 507: switch 111: transmitter 112: receiver

Claims (10)

for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of the second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. set the transmission source slot number that indicates the position within the device itself,
a transmitting unit configured to transmit the first frame to the third frame from the first destination card to the n-th destination card via the first channel to the n-th channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from the destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, a receiver that identifies a misconnected speech path;
Continuity test equipment. When the common fixed data and the expected value of the common fixed data match, and when the inverted fixed data and the expected value of the inverted fixed data match, the receiving unit transmits and receives the data through the n-th channel. detects that is normal,
The continuity test device according to claim 1. When the source slot number and the expected value of the source slot number do not match, or when the n-th destination slot number and the expected value of the n-th destination slot number do not match , the erroneously connected channel is the channel between the source card installed in the source slot number transmitted and the destination card installed in the destination slot number transmitted. identify that there is
The continuity test device according to claim 1 or 2. The receiving unit receives the third frame when the common fixed data and the expected value of the common fixed data match, and when the inverted fixed data and the expected value of the inverted fixed data match.
The continuity testing device according to any one of claims 1 to 3. The transmission unit repeats transmission of the first frame to the third frame,
The continuity testing device according to any one of claims 1 to 4. each of the first frame, the second frame, and the third frame includes service data for a call,
The continuity testing device according to any one of claims 1 to 5. The common fixed data is hexadecimal 55,
The inverted fixed data is hexadecimal AA,
The continuity testing device according to any one of claims 1 to 6. The transmission unit
setting hexadecimal FF instead of the common fixed data of the first frame;
setting the n-th transmission destination slot number and the transmission source slot number instead of the inverted fixed data of the second frame;
setting an inverted n-th destination slot number obtained by inverting the n-th destination slot number instead of the n-th destination slot number of the third frame;
setting an inverted transmission source slot number obtained by inverting the transmission source slot number instead of the transmission source slot number of the third frame;
The continuity test device according to claim 1. for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of a second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. setting a transmission source slot number that indicates the position within the own device that has been received;
transmitting the first frame to the third frame from the first destination card to the nth destination card via the first channel to the nth channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from a destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, identifying misconnected call paths;
A continuity test method comprising: for testing the first through nth paths between the source card and each of the first through nth destination cards (where n is a natural number),
setting common fixed data in each time slot from 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 time slot from the first time slot to the n-th time slot of a second frame;
The n-th destination slot number indicating the position within the device in which the n-th destination card is mounted and the source card are mounted in each time slot from the first time slot to the n-th time slot of the third frame. setting a transmission source slot number that indicates the position within the own device that has been received;
transmitting the first frame to the third frame from the first destination card to the nth destination card via the first channel to the nth channel;
In each of the first destination card to the nth destination card,
collating the common fixed data transmitted from the transmission source card with an expected value of the common fixed data; collating the inverted fixed data with an expected value of the inverted fixed data; detecting the normality of data transmitted and received over the n-th communication path to and from a destination card;
comparing the source slot number transmitted from the source card with an expected value of the source slot number, comparing the n-th destination slot number with an expected value of the n-th destination slot number, identifying misconnected call paths;
A program that makes a computer run

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