JP4901977B2 - Comparative monitoring system and comparative monitoring method - Google Patents

Description

  The present invention relates to a technique for comparing and monitoring the correlation between data strings.

  The provision of video distribution services using networks has become widespread, and in recent years, IP retransmission has also been performed in which terrestrial digital broadcasting or BS digital broadcasting is transmitted in real time using a network. When performing IP retransmission, convert video data to video data with higher encoding efficiency, or use data broadcasts and program information that are repeatedly transmitted with the same data, reducing the number of repetitions. Bandwidth is suppressed.

  At the time of IP retransmission, it is necessary to monitor whether there is a failure in the IP retransmission broadcast as compared with the terrestrial digital broadcast or BS digital broadcast. For example, Patent Document 1 discloses a technique for monitoring a television broadcast that is retransmitted by IP.

  As a method for monitoring IP retransmission broadcasts, a method of watching and monitoring by humans can be considered, but video, audio, subtitles, data broadcasts, program information, etc. are always watched, compared with digital terrestrial broadcasts and BS digitals. It is extremely difficult to confirm in real time whether a failure has occurred in the IP retransmission broadcast. The same applies when terrestrial digital broadcasting and BS digital broadcasting are retransmitted by CATV.

JP 2009-284184 A

  Therefore, there is a need for a comparative monitoring system that compares the data of terrestrial digital broadcasting, BS digital broadcasting, and IP retransmission broadcasting in real time, and notifies when there is an abnormality.

  However, IP retransmitted data may appear in a different order of data or the number of repetitions of the same data compared to terrestrial digital broadcast data and BS digital broadcast data. Does not affect the actual viewing, so it is necessary to ignore this when performing comparative monitoring. As described above, when the appearance frequency or the number of transmissions changes, there is a problem that data cannot be simply compared on a one-to-one basis.

  The present invention has been made in view of the above, and an object of the present invention is to compare and monitor a certain correlation even when the appearance order of data and the number of transmissions change between correlated data strings.

  A comparative monitoring system according to a first aspect of the present invention includes a first monitoring probe device that acquires data from a first transmission line, a second monitoring probe device that acquires data from a second transmission line, A comparison monitoring system comprising a comparison device for comparing whether or not predetermined data among the data acquired by each of the second monitoring probe devices is the same, wherein each of the first and second monitoring probe devices includes: An acquisition means for acquiring data from a transmission line, a check code generation means for generating a check code from the acquired data contents, and the check code when the value of the check code is different from the value of the check code generated immediately before And transmission means for transmitting comparison information including a time stamp of the data to the comparison device, the comparison device comprising the first and second monitoring devices. The first and second comparison information buffers that store the comparison information received from the probe devices respectively match the check code values included in the comparison information from the first and second comparison information buffers. Comparing means for searching for the set of comparison information and outputting an alert when the time difference of the time stamps included in the set of comparison information exceeds a predetermined time.

  In the comparison monitoring system, the comparison means outputs an alert when the comparison information that matches the check code value of the comparison information cannot be searched within a predetermined time from the time when the comparison information is received. Features.

  In the comparative monitoring system, a plurality of types of data are transmitted to the first and second transmission paths, and each of the first and second monitoring probe devices classifies the acquired data. A classifying unit that classifies each type; and a check code generating unit and a transmitting unit for each type; and the comparison device includes the comparing unit for each type.

  In the comparison and monitoring system, the first and second monitoring probe devices have a last time stamp obtaining unit that obtains a time stamp of the data acquired last as a last time stamp and transmits the last time stamp to the comparison device. The comparison device has a final time stamp comparison means for outputting an alert when the time difference between the final time stamps received from the first and second monitoring probe devices exceeds a predetermined time. To do.

  In the comparison and monitoring system, the check code generation unit changes the difference between the data obtained from each of the first and second transmission paths to the same difference. The check code is generated later.

  In the comparison monitoring system, the transmission means transmits the data corresponding to the comparison information together with the comparison information to the comparison device, and the comparison device outputs the first and the first when the comparison means outputs an alert. It has a display means which displays the difference part between the said data received from the 2nd monitoring probe apparatus, It is characterized by the above-mentioned.

  A comparative monitoring method according to a second aspect of the present invention includes a first monitoring probe device that acquires data from a first transmission line, a second monitoring probe device that acquires data from a second transmission line, A comparison monitoring method by a comparison device for comparing whether or not predetermined data among the data acquired by each of the second monitoring probe devices is the same, and a transmission path by each of the first and second monitoring probe devices The step of acquiring data from the step, the step of generating a check code from the content of the acquired data, and the time stamp of the check code and the data when the value of the check code is different from the value of the check code generated immediately before And transmitting the comparison information including the first and second monitoring probe devices by the comparison device. The step of accumulating the comparison information received from each of the first and second comparison information buffers and the value of the check code included in the comparison information from the first and second comparison information buffers match. Searching for the set of comparison information, and outputting an alert when the time difference between the time stamps included in the set of comparison information exceeds a predetermined time.

  According to the present invention, even when the data appearance order and the number of times of transmission change between correlated data strings, a constant correlation can be compared and monitored.

It is a functional block diagram which shows the structure of the comparison monitoring system in this Embodiment. It is a schematic diagram which shows the image of a data stream. It is a schematic diagram explaining the process of the comparison information generation part of the said comparison monitoring system. It is a schematic diagram explaining the process of the comparison apparatus of the said comparison monitoring system. It is a functional block diagram which shows the structure of the change data extraction part which a comparison apparatus has. It is a figure which shows the example of a display of the said change data extraction part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a functional block diagram showing a configuration of a comparison monitoring system in the present embodiment. The comparison monitoring system shown in the figure includes monitoring probe devices 20 and 30 and a comparison device 40, compares the data stream (1) and the data stream (2), and outputs a warning if they are different. The data stream (2) is obtained by converting the data stream (1) by the data stream conversion unit 10.

  The data stream conversion unit 10 receives the data stream (1) (for example, terrestrial digital broadcasting data), performs conversion processing, and outputs the data stream (2) (for example, terrestrial digital IP retransmission data). Specifically, the data stream conversion unit 10 converts the video data of the terrestrial digital broadcasting data into video data with higher encoding efficiency, and other than the audio data of the terrestrial digital broadcasting data, subtitles, data broadcasting, program information, etc. Output without converting to other formats. If data with the same contents such as data broadcasting and program information are sent periodically, the number of times is reduced and output. For example, when the same data is input twice in the data broadcast, the data stream conversion unit 10 does not output the second data. Alternatively, the data transmitted three times per minute is reduced to two times per minute for transmission. In the comparison monitoring system according to the present embodiment, the data stream conversion unit 10 converts, for example, the encoding method of video data without converting the encoding method of audio data or program information. Audio data, program information, etc. whose data contents do not change are subject to comparative monitoring. That is, video data having different encoding formats before and after conversion are not subject to comparison and monitoring. As a case where the format before and after conversion is different, for example, the original video is MPEG2 and the converted video is H.264. In the case of H.264, the bit rate is lowered with MPEG2 being converted, or MPEG4 is used as the format after conversion. In this embodiment, video data having different formats before and after conversion is not subject to comparison and monitoring, and any conversion may be performed on the video data.

  FIG. 2 is a schematic diagram showing an image of a data stream. FIG. 2A shows an image of the data stream (1) before conversion, and FIG. 2B shows an image of the data stream (2) after conversion. A square in FIG. 2 represents a Transport Stream (TS) packet.

  In the data stream, a plurality of data types flow together. Data having a large data size is divided into packets. In FIG. 2, the letters such as A, B,... X in the packet indicate the data type, and the number next to the letter indicates the packet number of the data type. The pattern in the box on the right side of the packet represents the contents of the data. A packet having the same data type and having consecutive numbers and having the same pattern in the box indicates a packet divided from the same data. For example, packets A-5, A-4, and A-3 in FIG. 2A are packets obtained by dividing one piece of data. The number below the packet indicates a time stamp indicating the time when each probe device receives the packet.

  Note that the order of packets before and after the data stream conversion by the data stream conversion unit 10 is not guaranteed. That is, the order of the packets may not match between the data streams. For example, in FIG. 2A, the packet “X-1” appears next to the packet “A-3”, but in FIG. 2B, the packet “X-1” is the packet “A-1”. "Is appearing next.

  In addition, there is a difference in the time at which correlated data packets appear before and after conversion of the data stream. In the example shown in FIG. 2, the time stamp attached to the packet “X-1” in the data stream (1) is “10: 12: 20.010”, whereas the packet “X” in the data stream (2). The time stamp attached to “−1” is “10: 12: 20.845”. The comparison monitoring system according to the present embodiment determines whether data is missing or whether the difference in time stamps of corresponding data between the data streams (1) and (2) is within a predetermined range. .

  Returning to FIG. 1, the description of the comparative monitoring system will be continued. The monitoring probe device 20 inputs the data stream (1) from the transmission path on the input side of the data stream conversion unit 10 to generate comparison information, and transmits the data reconstructed from the packet and the comparison information to the comparison device 40. The monitoring probe device 30 receives the data stream (2) from the transmission line on the output side of the data stream conversion unit 10, generates comparison information, and transmits the data reconstructed from the packet and the comparison information to the comparison device 40. The comparison device 40 compares the comparison information received from the monitoring probe devices 20 and 30, and outputs a warning when a difference is found. Note that the monitoring probe devices 20 and 30 do not transmit all data and comparison information to the comparison device 40, but only the data that satisfies a predetermined condition, the comparison information generated from the data and the comparison information to the comparison device 40. Send. Details of the monitoring probe devices 20 and 30 and the comparison device 40 will be described later.

  Each unit included in the monitoring probe devices 20 and 30 and the comparison device 40 may be configured by a computer including an arithmetic processing device, a storage device, a memory, and the like, and the processing of each unit may be executed by a program. This program is stored in a storage device included in each device, and can be recorded on a recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, or provided through a network. In the present embodiment, the monitoring probe devices 20 and 30 and the comparison device 40 are configured as separate devices, but each unit may of course be configured as a single device. Details of each device will be described below.

  Since the monitoring probe device 20 and the monitoring probe device 30 are the same except that the data streams to be acquired are different, the monitoring probe device 20 will be described here. The monitoring probe device 20 includes a packet analysis unit 21 and a plurality of comparison information generation units 22A, 22B,.

  The packet analysis unit 21 inputs a data stream transmitted by mixing a plurality of data type packets, and classifies the input packets for each data type. The data type is, for example, audio, caption, data broadcast, program information, or the like. Packets classified for each data type are transmitted to comparison information generation units 22A, 22B,..., 22X prepared for each data type.

  The comparison information generation units 22A, 22B,..., 22X receive packets from the packet analysis unit 21, reconstruct data, generate comparison information, and transmit the comparison information to the comparison device 40. Each of the comparison information generation units 22A, 22B,..., 22X is the same except that the received data type is different. Similar to the monitoring probe apparatus 20, the monitoring probe apparatus 30 includes comparison information generation units 32A, 32B,..., 32X for each data type. That is, each of the monitoring probe devices 20 and 30 has the same number of comparison information generation units.

  Each of the comparison information generation units 22A, 22B,..., 22X generates a check code from the contents of the reconstructed data by combining units 221A, 221B,. , 222X, and change detection units 223A, 223B,..., 223X for determining whether to transmit the reconstructed data and the comparison information to the comparison device 40. The comparison information is information including a check code generated by the check code generation units 222A, 222B, ..., 222X and a time stamp of the reconstructed data. The check code is a value of about several bytes generated from data using, for example, cyclic redundancy check (CRC: cyclic redundancy check).

  FIG. 3 is a schematic diagram illustrating the processing of the comparison information generation unit. 3A to 3C show the processing of the comparison information generation units 22A, 22B, and 22X included in the monitoring probe device 20, and FIGS. 3D to 3F include the monitoring probe device 30. A state of processing of the comparison information generation units 32A, 32B, and 32X is shown. In the figure, the packets are arranged from bottom to top in the order received. In both cases, the same processing is performed, and therefore, description will be given here with a focus on FIG. 3A showing the processing of the comparison information generation unit 22A.

  In the monitoring probe device 20, the packet with the data type “A” is transmitted to the comparison information generation unit 22A. In FIG. 3A, packets of data type “A” of A-5, A-4, A-3,..., A6 are received. The combining unit 221A combines the packets obtained by dividing the same single data to reconstruct the data. In FIG. 3A, data is reconstructed by combining, for example, packets A-5, A-4, and A-3. The time stamp of the reconstructed data at this time is assumed to be the time stamp “10: 12: 19.099” attached to the last packet A-3. Note that the uppermost dotted lines in FIGS. 3B and 3E indicate that packets for reconstructing data are not yet prepared. In some cases, as shown in FIGS. 3C and 3F, data is not divided and one packet corresponds to one data.

  The check code generation unit 222A calculates a CRC of the reconstructed data and generates a check code. For example, in FIG. 3A, the check code of the data reconstructed from A-5, A-4, and A-3 is 0x995C, and the data reconstructed from A-2, A-1, and A0 is checked. The code is 0xD238.

  When the data stream conversion unit 10 rewrites a bit at a predetermined location of a specific data type, the check code generation unit 222A generates a check code by bit-masking the rewritten location. For example, when the data stream conversion unit 10 rewrites and outputs the 10th to 15th bits from the beginning of the data of the data type “B”, the check code generation units 222B and 322B output the 10th to 15th bits of the data. Overwrite with a fixed value to generate a check code. As a result, a check code having the same value is generated if the portions other than the rewritten portion are the same. Alternatively, when the data stream conversion unit 10 changes a part of the data according to a predetermined rule, the check code generation unit 222B that handles the data before the change is configured so that the part of the changed data is the same as after the change. , Generate a check code after changing some of the data.

  The change detection unit 223A detects a change point where the check code generated by the check code generation unit 222A changes. When the change point is detected, the change detection unit 223A transmits the reconstructed data and the comparison information to the comparison device 40. In FIG. 3A, both the second and third check codes from the bottom do not change at 0xD238, and the check code changes from the second to the fourth from the bottom (shown as “change point” in FIG. 3). ing). Therefore, the data and the comparison information are transmitted to the comparison device 40 in the second and fourth from the bottom. The comparison information transmitted to the comparison device 40 includes a check code and a time stamp. For example, the comparison information of the second data from the bottom in FIG. 3A includes a check code “0xD238” and a time stamp “10: 12: 20.124”. In order to compare the value of the generated check code with the value of the check code generated immediately before, the generated check code is temporarily stored in the storage unit included in the change detection unit 223A.

  Next, the comparison device 40 will be described. The comparison device 40 compares corresponding comparison information received from each of the monitoring probe devices 20 and 30, and outputs an alert if the compared comparison information is different. The comparison device 40 includes comparison information receiving units 42 and 43 that receive and store data and comparison information transmitted by the monitoring probe devices 20 and 30, respectively, and comparison units 44A and 44B that compare comparison information for each data type.・ Has 44X

  The comparison information receiving unit 42 includes comparison information buffers 421A, 421B,..., 421X and storage units 422A, 422B,. The comparison information buffers 421A, 421B,..., 421X temporarily store the comparison information transmitted by the monitoring probe device 20 for each data type. The storage units 422A, 422B,..., 422X store the data transmitted by the monitoring probe device 20 for each data type. For example, the comparison information buffer 421A temporarily stores comparison information transmitted by the comparison information generation unit 22A of the monitoring probe device 20, that is, comparison information regarding data of the data type “A” of the data stream (1). . In the storage unit 422A, data of the data type “A” of the data stream (1) is stored. Similarly, the comparison information receiving unit 43 has comparison information buffers 431A, 431B,..., 431X and storage units 432A, 432B,. The comparison information and data are stored.

  The comparison units 44A, 44B,..., 44X are prepared for each data type. When the comparison information is different from the comparison information receiving units 42 and 43, the comparison information of the corresponding data types is read and compared. Output an alert. The comparison units 44A, 44B,..., 44X acquire corresponding comparison information from the comparison information buffers 421A, 421B,..., 421X and the comparison information buffers 431A, 431B,. It is determined whether or not the time difference between the time stamps of the information set is within a predetermined time. An alert is output when the corresponding comparison information cannot be acquired, or when the time difference between the time stamps exceeds a predetermined time. An alert is also output when the corresponding comparison information cannot be acquired.

  Taking the comparison unit 44A as an example, the process of outputting an alert will be described more specifically.

  First, the comparison unit 44A extracts the comparison information from the comparison information buffers 421A and 431A in order from the oldest, and compares the check codes of the comparison information.

  When comparison information having the same check code is not found, it is determined whether or not a predetermined time has elapsed since the time when the comparison information was received. If the predetermined time has elapsed, a time-out alert is output. . Note that the time stamp included in the comparison information may be used as the time when the comparison information is received.

  When comparison information having the same check code is found from each of the comparison information buffers 421A and 431A, it is determined whether or not the time stamp difference of each comparison information is within a predetermined time, and the time stamp difference is a predetermined time. If it exceeds, a time difference error alert is output.

  Comparison information having the same check code and a time stamp difference within a predetermined time is determined to be matched, and the comparison information is removed from each of the comparison information buffers 421A and 431A. If the comparison information received before the comparison information for which matching is established remains in the comparison information buffers 421A and 431A, it is determined that the comparison information corresponding to the comparison information is missing, and a missing error is output.

  When the comparison information received after the comparison information for which matching is established is present in the comparison information buffers 421A and 431A, the above processing is repeated.

  FIG. 4 is a schematic diagram for explaining the processing of the comparison device 40. 4A is a comparison information of FIGS. 3A and 3D, FIG. 4B is a comparison information of FIGS. 3B and 3E, and FIG. 4C is a comparison information of FIGS. 3C and 3F. It shows how to compare. 4A to 4C, the comparison information buffer on the data stream (1) side (comparison information receiving unit 42) is on the left side, and the comparison information buffer on the data stream (2) side (comparison information receiving unit 43) is on the right side. The contents are shown.

  In FIG. 4A, corresponding comparison information with the same check code can be acquired, and the time difference between the time stamps of each comparison information is also within 1000 milliseconds. In this case, it is determined that the alert is normal and no alert is output.

  In FIG. 4B, the corresponding comparison information having the same check code can be acquired, but the time difference of the time stamp of the third comparison information [n + 2] from the bottom exceeds 1000 milliseconds, so a time difference error Alert is output.

  In FIG. 4C, since the comparison information on the data stream (2) side corresponding to the second comparison information [n + 1] from the bottom on the data stream (1) side cannot be acquired, a missing error alert is output. In the example shown in FIG. 4C, when the comparison information on the data stream (2) side corresponding to the third comparison information [n + 2] from the bottom of the data stream (1) can be acquired, the data stream (2) It is determined that the comparison information corresponding to the comparison information [n + 1] on the data stream (1) side is missing.

  Although not shown, when the comparison information of either data stream is accumulated in the comparison information buffer and the corresponding comparison information cannot be acquired from another data stream side even after a predetermined time has elapsed, A timeout alert is output.

  FIG. 5 is a diagram illustrating a change data extraction unit 45 for the comparison device 40 to display a different portion of data. The change data extraction unit 45 reads the data corresponding to the comparison information determined to be different between the comparison units 44A, 44B,..., 44X from the storage units 422A and 432A, and displays the difference between the read data. indicate. The storage units 422A, 422B,..., 422X store data in association with time stamps, so that data corresponding to the comparison information can be easily retrieved. FIG. 6 shows an example in which different parts are displayed.

  Next, the processing flow of the comparison monitoring system will be described.

  First, each of the monitoring probe devices 20 and 30 acquires a data stream before and after conversion. The monitoring probe device 20 acquires the data stream (1) before conversion, and the monitoring probe device 30 acquires the data stream (2) after conversion.

  Subsequently, the packet analysis unit 21 of the monitoring probe device 20 classifies the packets for each data type and transmits the packets to corresponding comparison information generation units 22A, 22B,. The packet analysis unit 31 of the monitoring probe device 30 performs the same processing. Hereinafter, description of the same processing performed in the monitoring probe apparatus 30 will be omitted.

  Subsequently, the combining units 221A, 221B,..., 221X combine the packets to reconstruct the data, and the check code generation units 222A, 222B,.

  Then, the change detection units 223A, 223B,..., 223X determine whether the check code has changed, thereby determining whether the data is to be compared. If it is not the data to be compared, the process for that data is terminated. In the present embodiment, in order to compare and monitor the correlation by ignoring the difference in the number of transmissions of repeatedly transmitted data, the comparison target is when the check code changes for each data type, that is, when the data changes. Data. For example, even when data transmitted three times per minute in the data stream (1) is transmitted only twice per minute in the data stream (2), the data to be compared is the first one.

  In the case of data to be compared, the comparison information generation units 22A, 22B,..., 22X transmit the reconstructed data and comparison information including the check code and time stamp to the comparison device 40, and the comparison device 40 receives the comparison information. The comparison information is stored in the comparison information buffers 421A,..., 421X, and the received data is stored in the storage units 422A, 422B,.

  The comparison units 44A, 44B,..., 44X read the comparison information from the comparison information buffers 421A,..., 421X and the comparison information buffers 431A,. Is detected, and in the present embodiment, data corresponding to the comparison information in which the difference is detected is read from each of the comparison information receiving units 42 and 43 and the difference is compared and displayed.

  Further, the comparison and monitoring system in the present embodiment compares the time stamps of the packets input by the monitoring probe devices 20 and 30, and determines whether one of the data streams is stopped. Specifically, the monitoring probe devices 20 and 30 acquire the time stamp of the last input packet for each data type as a final time stamp and transmit it to the comparison device 40. The last time stamp is updated when the packet is acquired. The comparison device 40 compares the last time stamp received from each of the monitoring probe devices 20 and 30, and outputs an alarm when the difference exceeds a predetermined time. The stop of the data stream may be determined by comparing the bandwidth of the data stream.

  As described above, according to the present embodiment, when the check code is calculated from the contents of the data acquired by each of the monitoring probe devices 20 and 30, and the value of the check code is different from the check code generated immediately before, The comparison information including the check code and the data time stamp is transmitted to the comparison device 40. The comparison device 40 compares the comparison information received from each of the monitoring probe devices 20 and 30, and when a difference is detected in the comparison information. By outputting an alert, if the same check code is consecutive, that is, if the same data is received continuously, comparison processing is not performed, so the correlation between data streams is ignored by ignoring the difference in the number of data transmissions. Gender can be compared and monitored.

  According to the present embodiment, the comparison device 40 does not directly compare the data, but compares the check code calculated from the contents of the data. Therefore, even if the data amount varies, the amount of comparison processing performed by the comparison device 40 Can be suppressed.

  According to the present embodiment, the packets input by the packet analysis unit 21 are classified for each data type, and the comparison information generation units 22A, 22B,. Even when the order of appearing data is different, the correlation of data can be compared and monitored.

  In the present embodiment, the case where the process of reducing the number of transmissions of data input by the data stream conversion unit 10 has been described. However, even when the number of transmissions of data input by the data stream conversion unit 10 is increased, the data stream The correlation between them can be compared and monitored.

  In the present embodiment, the change detection unit detects the data to be compared by detecting the change point of the check code. However, the determination condition of the change detection unit can be changed according to the specification of the data stream conversion unit 10. For example, when the data stream conversion unit 10 performs a process of deleting the silent portion of the audio data, the change detection unit detects the silent portion and generates data other than the silent portion as comparison target data from the content of the data. By sending a check code to the comparison device 40, comparison and monitoring can be performed.

DESCRIPTION OF SYMBOLS 10 ... Data stream conversion part 20, 30 ... Monitoring probe apparatus 21, 31 ... Packet analysis part 22A, 22B, 22X, 32A, 32B, 32X ... Comparison information generation part 221A, 221B, ... Combining part 222A, 222B, 222X, 322A , 322B, 322X ... check code generation unit 223A, 223B, 223X, 323A, 323B, 323X ... change detection unit 40 ... comparison device 42, 43 ... comparison information reception unit 421A, 421B, 421X, 431A, 431B, 431X ... comparison information Buffers 422A, 422B, 422X, 432A, 432B, 432X ... Accumulation unit 44A, 44B, 44X ... Comparison unit 45 ... Change data extraction unit

Claims (7)

A first monitoring probe device that acquires data from the first transmission path, a second monitoring probe device that acquires data from the second transmission path, and the data acquired by each of the first and second monitoring probe devices A comparison monitoring system comprising a comparison device for comparing whether or not predetermined data is the same,
Each of the first and second monitoring probe devices includes:
Obtaining means for obtaining data from the transmission line;
Check code generation means for generating a check code from the content of the acquired data;
Transmission means for transmitting comparison information including the check code and the time stamp of the data to the comparison device when the value of the check code is different from the value of the check code generated immediately before,
The comparison device includes:
First and second comparison information buffers for storing the comparison information received from the first and second monitoring probe devices, respectively.
The set of comparison information in which the value of the check code included in the comparison information matches is searched from each of the first and second comparison information buffers, and a time difference of time stamps included in the set of comparison information is a predetermined time A comparison means for outputting an alert when the time is exceeded.   The comparison means outputs an alert when the comparison information that matches the check code value of the comparison information cannot be searched within a predetermined time from the time when the comparison information is received. The comparative monitoring system described. A plurality of types of data are transmitted to the first and second transmission lines,
Each of the first and second monitoring probe devices includes:
Classification means for classifying the acquired data for each type;
The check code generation means and the transmission means for each type,
The comparison device includes:
The comparison monitoring system according to claim 1, wherein the comparison unit is provided for each type. The first and second monitoring probe devices include:
A last time stamp obtaining means for obtaining the last time stamp of the data obtained as the last time stamp and transmitting to the comparison device;
The comparison device includes:
The last time stamp comparison means for outputting an alert when the time difference between the last time stamps received from each of the first and second monitoring probe devices exceeds a predetermined time. The comparative monitoring system according to any one of the above.   The check code generation means, for a known different portion existing in a part between the data acquired from each of the first and second transmission lines, changes the difference portion to the same and then changes the check code. The comparison monitoring system according to claim 1, wherein the comparison monitoring system is generated. The transmission means transmits the data corresponding to the comparison information together with the comparison information to the comparison device,
The comparison device includes:
6. The display device according to claim 1, further comprising a display unit that displays a difference between the data received from the first and second monitoring probe devices when the comparison unit outputs an alert. The comparative monitoring system described. A first monitoring probe device that acquires data from the first transmission path, a second monitoring probe device that acquires data from the second transmission path, and the data acquired by each of the first and second monitoring probe devices A comparison monitoring method using a comparison device for comparing whether or not predetermined data is the same,
According to each of the first and second monitoring probe devices,
Acquiring data from a transmission line;
Generating a check code from the content of the acquired data;
When the value of the check code is different from the value of the check code generated immediately before, sending the comparison information including the check code and the time stamp of the data to the comparison device,
According to the comparison device,
Storing the comparison information received from each of the first and second monitoring probe devices in first and second comparison information buffers, respectively.
The set of comparison information in which the check code values included in the comparison information match is searched from the first and second comparison information buffers, and the time difference between the time stamps included in the set of comparison information is a predetermined time. And a step of outputting an alert when the threshold is exceeded.

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