JP2009260450A - Communication analysis device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication analysis device which quantitatively determine a network state enabling even a person having no expert knowledge nor experiences relating to communication protocols and waveform signals to easily specify the cause of a transmission fault and a fault occurring part and to take countermeasure against the fault, and which therefore improves the efficiency of analysis work. <P>SOLUTION: A communication telegram transmitted from a transmission line and waveform signals are tentatively stored in a storage means, and synchronized by the acquisition time by a synchronization determination means 108. An analysis waveform information generation means 109 extracts a part corresponding to an ideal waveform signal stored in an ideal waveform information storage means 112 of the waveform signals synchronized with the communication telegram as an analysis waveform signal which is an analysis target. A communication state determination means 113 estimates the communication state of the transmission line on the basis of the result of comparing the analysis waveform signal extracted by the analysis waveform information generation means 110 with the ideal waveform signal stored in the storage means. The estimated result is displayed by an analyzed result display means 114. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication analysis apparatus that supports an analysis work for a network transmission failure by automatically analyzing a waveform signal flowing through a transmission path of a wired or wireless network.

  A network transmission failure occurs because the shape of the waveform signal flowing through the transmission path is disturbed for some reason, and the signal intended by the command transmission source cannot be maintained up to the command transmission destination. Therefore, network physical layer level analysis is required as a diagnostic work for transmission failures.

As a conventional technique of physical layer level analysis, a communication test apparatus (see Patent Document 1) for the purpose of facilitating communication analysis by associating and presenting a communication sequence and a physical quantity, and an OFDM transmission signal There is a transmission signal analyzing apparatus (see Patent Document 2) that sets an ideal pilot signal and uses this to analyze an actual pilot signal.
Japanese Patent Laying-Open No. 2006-33007 (pages 15 to 21 and FIGS. 1 to 2) Japanese Patent Laying-Open No. 2006-245972 (pages 6 to 7, FIGS. 1 to 6)

In conventional failure analysis, the operator can observe the voltage level, frequency components, in-phase / out-of-phase components, etc. of the waveform signal flowing through the transmission line, so that the communication state can be qualitatively evaluated. It was not easy to evaluate. For this reason, even if a failure occurs in the network, it can only be handled by an expert who has specialized knowledge and experience in communication protocols and waveform signals.
The present invention has been made to solve the above-described problems, and can easily identify and deal with the cause of a transmission failure and the location where the failure has occurred, even without specialized knowledge and experience regarding communication protocols and waveform signals. It is possible to obtain a communication analysis device that quantitatively determines a network state that can be analyzed and improves the efficiency of analysis work.

  The present invention relates to a predetermined communication protocol which is transmitted from a transmission path and is an analysis target in a communication analysis apparatus connected to a transmission source terminal or a transmission destination terminal of the analysis waveform signal or a transmission path connecting the transmission source terminal and the transmission destination terminal. Analytical waveform information generating means for generating analytical waveform information including the waveform signal based on the waveform signal in FIG. 5, storage means having an ideal waveform signal in the communication protocol, and communication state determining means, and generating analytical waveform information The means extracts the portion corresponding to the ideal waveform signal stored in the waveform signal storage means as the analysis waveform signal to be analyzed, and the communication state determination means is the analysis waveform signal extracted by the analysis waveform information generation means and the storage The communication state of the transmission path is estimated based on the result of comparison with the ideal waveform signal stored in the means.

  Since the communication analysis device according to the present invention automatically determines the network status, the cause of the transmission failure and the location where the failure has occurred can be easily identified without specialized knowledge or experience regarding the communication protocol or waveform signal. Can be dealt with.

Embodiment.
FIG. 1 is a block diagram showing a configuration of communication analysis apparatus 100 according to the embodiment of the present invention.
The communication analysis apparatus 100 includes a communication unit 101, a waveform measurement unit 102, a communication message storage unit 103 with division organization information, a waveform signal storage unit 104 with division organization information, a message division organization information addition unit 105, and a waveform division. Arrangement information giving means 106, message analysis means 107, synchronization determination means 108, analysis waveform information generation means 109, analysis waveform information storage means 110, waveform feature quantity calculation means 111, and ideal waveform information storage means 112 The communication state determination unit 113 and the analysis result display unit 114 are included.

  The communication message storage means 103 with division arrangement information stores one or more communication messages 200a with division arrangement information. The waveform signal storage means 104 with division arrangement information stores one or more waveform signals 200b with division arrangement information. The message analysis unit 107 includes one or more message analyzers 1071. The message analyzer 1071 has a message analyzer label 10711 and a message analysis target 10712. The synchronization determination means 108 has a synchronization determination condition 1081. The analysis waveform information storage means 110 stores one or more analysis waveform information 400a. The waveform feature quantity calculation unit 111 includes one or more feature quantity calculators 1111. The feature quantity calculator 1111 has a calculator label 11111 and calculation target data 11112. The ideal waveform information storage unit 112 stores one or more pieces of ideal waveform information 400b.

FIG. 2 is a diagram illustrating a configuration of the data 200 with division organization information.
The division organization information-added data 200 has zero or more division organization information 300, one data 201, zero or more data information 202, and zero or more division organization information flags 203.

FIG. 3 is a diagram showing a configuration of the division organization information 300. As shown in FIG.
The division organization information 300 includes basic information 301, analysis information 303, and related information 302.
The basic information 301 includes a division unit 3011, a basic ID 3012, a division position 3013, a division time 3014, and a data type 3015. The related information 302 has 0 or more related IDs 3021. The analysis information 303 includes zero or more sets of analysis labels 3031 and analysis values 3032.

The configuration of the communication message 200a with division organization information and the waveform signal 200b with division organization information follows the configuration of the data 200 with division organization information.
That is, the communication message 200a with the division organization information includes the message division organization information 300a as the division organization information 300, the communication message 201a as the data 201, the message acquisition time 202a1 as the data information 202, and the communication unit extraction flag 203a1. And a message analysis flag 203a2 and a synchronization determination flag 203a3 are provided as the division organization information processing flag 203.
The waveform signal 200b with division organization information includes a waveform division organization information 300b as the division organization information 300, a waveform signal 201b as the data 201, a waveform acquisition time 202b1 and a sampling rate 202b2 as the data information 202, and a communication unit. The extraction flag 203b1 and the synchronization determination flag 203b2 are provided as the division organization information processing flag 203.

Next, the operation of the communication analysis apparatus 100 will be described.
The processing performed by the communication analysis apparatus 100 is roughly divided into four procedures. Communication message acquisition / analysis procedure 1A, waveform signal acquisition / synchronization procedure 1B, analysis waveform information generation procedure 1C, and communication state determination procedure 1D. Hereinafter, the procedures 1A to 1D will be described.

The message acquisition / analysis procedure 1A will be described.
The communication means 101 is connected to a wired or wireless transmission path, sequentially acquires a communication message 201a transmitted / received by a device connected on the transmission path, and a message acquisition time 202a1 representing the time when the communication message 201a is acquired. The communication message 201a and the message acquisition time 202a1 are recorded and notified to the communication message storage unit 103 with division and organization information.

  Note that one or more communication units 101 may be provided, and each communication unit 101 may acquire the communication message 201a having a different communication protocol.

  Each time the communication message 201a is notified, the communication message storage unit 103 with the division and organization information newly generates the communication message 200a with the division and organization information, and stores the communication message 201a and the message acquisition time 202a1, Remember.

  The communication message storage means 103 with division organization information further notifies the message division organization information addition unit 105 of the communication message 200a with division organization information that the communication unit extraction flag 203a1 is not set. Notifying the message analysis means 107 that the unit extraction flag 203a1 is set and the message analysis flag 203a2 is not set, and the message analysis flag 203a2 is set and the synchronization determination flag 203a3 is not set The synchronization determination means 108 is notified, and the analysis waveform information generation means 109 is notified that the synchronization determination flag 203a3 is set.

  The message division organization information adding unit 105 is notified by the communication message storage unit 103 with division organization information, and sets the communication unit extraction flag 203a1 of the communication message 200a with the division organization information 203a1 in which the communication unit extraction flag 203a1 is not set. The start position and end position of the communication unit included in the communication message 201a, and the communication protocol to which the communication message 201a conforms are derived. Each time the start position and the end position are derived, the message segmentation information 300a is generated and the basic information 301 is stored. That is, the basic ID 3012 unique to the message segmentation information 300a is generated, the start time corresponding to the start position and the end time corresponding to the end position are derived based on the message acquisition time 202a1, and the basic ID 3012 , The start position and the end position are stored in the division position 3013, the start time and the end time are stored in the division time 3014, and the communication protocol is stored in the data type 3015.

  The start position and the end position may be derived from the pause time of the communication message 201a, or may be derived by extracting start bits and stop bits. The communication protocol includes a table in which the message segmentation information providing unit 105 associates the communication message header format with the communication protocol, and may be derived by referring to the table, or the communication unit 101 is provided for each communication protocol. However, it may be derived by determining the communication means 101 that is the notification source of the communication message 201a.

The message analysis unit 107 is notified by the communication message storage unit 103 with division organization information, and the message analysis flag of the communication message 200a with division organization information in which the communication unit extraction flag 203a1 is set and the message analysis flag 203a2 is not set. 203a2 is set up and the following processing is performed for all the message analyzers 1071 included in the message analysis means 107.
When the message analysis target 10712 included in the message analyzer 1071 matches the data type 3015 included in the message division organization information 300a, the start position and the end stored in the division position 3013 included in the message division organization information 300a The communication message 201a in the range indicated by the position is input to the message analyzer 1071, and the message analyzer 1071 has the output result of the message analyzer 1071 as the analysis value 3032 included in the message division organization information 300a. The message analyzer label 10711 is stored in the analysis label 3031.

  The message analyzer 1071 may be an address analyzer that derives the transmission destination and source address of the communication message, or may be a CRC error determination unit that derives a CRC error of the communication message.

The waveform acquisition / synchronization procedure 1B will be described.
The waveform measuring means 102 is connected to a wired or wireless transmission path, and sequentially acquires a waveform signal 201b transmitted and received by a device connected on the transmission path at an arbitrary sampling rate 202b2, and the time when the waveform signal 201b is acquired Is acquired, and the waveform signal 201b, the waveform acquisition time 202b1, and the sampling rate 202b2 are notified to the waveform signal storage means 104 with division arrangement information.

  Note that one or more waveform measuring means 102 may be provided, and each of the waveform measuring means 102 may acquire the waveform signals 201b having different sampling rates 202b2.

  Each time the waveform signal 201b is notified, the waveform signal storage means 104 with division organization information newly generates the division organization information waveform signal 200b, and the waveform signal 201b, the waveform signal acquisition time 202b1, and the sampling rate 202b2 is stored and stored.

  The waveform signal storage means 104 with division organization information further notifies the waveform division organization information addition unit 106 of the waveform signal with division organization information 200b that the division organization information addition flag 203b1 is not set, The division organization information addition flag 203b1 is set and the above is notified to the synchronization determining means 108, and the synchronization determination flag 203b2 is set to the analysis waveform information generating means 109.

  The waveform division organization information adding unit 106 sets the communication unit extraction flag 203b1 of the waveform signal 200b with division organization information notified by the communication message storage unit 103 with division organization information and the division organization information addition flag 203b1 is not set, The start position and end position of the communication unit are derived from the waveform signal 201b. Each time the start position and the end position are extracted, the waveform division organization information 300b is generated, and the basic information 301 included in the waveform division organization information 300b is stored. That is, the basic ID 3012 unique to the waveform division organization information 300b is generated, and based on the waveform acquisition time 202b1 and the sampling rate 202b2, a start time corresponding to the start position and an end time corresponding to the end position are obtained. The division unit 3011 is a communication unit, the basic ID 3012 is stored, the start position and the end position are stored in the division position 3013, and the start time and the end time are stored in the division time 3014. Store.

  Note that the start position and the end position may be derived by comparing the level of the waveform signal 201b with the level threshold by the waveform division organization information providing unit 106 having a level threshold, or the communication unit. The division organization information adding unit 105 may have a level change amount threshold value, and may be derived by comparing the level change amount of the waveform signal 201b with the level change amount threshold value.

  The synchronization determination unit 108 is notified by the communication message storage unit 103 with division organization information, and the message division organization information 300a of the communication message 200a with division organization information in which the synchronization determination flag 203a3 is not set, and the waveform with division organization information The waveform division organization information 300b of the waveform signal with division organization information 200b in which the synchronization determination flag 203b2 notified by the signal storage means 104 is not set is extracted one by one to form a set, and the message division organization information 300a and the message division organization information 300a and the When the division time 3014 included in the waveform division organization information 300b satisfies the synchronization determination condition 1081, the basic ID 3012 included in each other is stored in the related ID 3021 of the other side, and the synchronization determination included in the communication message 200a with division organization information The synchronization determination flag 203b2 included in the flag 203a3 and the waveform signal 200b with division organization information is set. This process is repeated for all sets of the message division organization information 300a and the waveform division organization information 300b.

This is shown in FIG. The association between the communication telegram 201a and the waveform signal 201b using the division organization information 300 will be specifically described with reference to FIG.
The synchronization determination means 108 is notified by the communication message storage means 103 with division arrangement information, and the message division arrangement information 300a included in the communication message 200a with division arrangement information in which the synchronization determination flag 203a3 is not set, and the waveform signal storage with division arrangement information One piece of the waveform division organization information 300b included in the waveform signal with division organization information 200b in which the synchronization determination flag 203b2 notified by the means 104 is not set is extracted to create a set, and the message division organization information 300a and the waveform division When the division time 3014 included in the organization information 300b satisfies the synchronization determination condition 1081, the basic ID 3012 = P01-01 included in the organization information 300b is stored in the related ID 3021 included in the organization information 300b, and the basic ID 3012 included in the organization information 300b. = W01-01 is stored in the related ID 3021 which the division organization information 300a has.
Next, in the same manner as described above, the synchronization determination unit 108, when the division time 3014 included in the message division organization information 300a and the waveform division organization information 300b satisfies the synchronization determination condition 1081, the basic ID 3012 = P01 included in the division organization information 300a. -02 is stored in the related ID 3021 included in the divided organization information 300b, and the basic ID 3012 = W01-02 included in the divided organization information 300b is stored in the related ID 3021 included in the divided organization information 300a.
Next, in the same manner as described above, the synchronization determination unit 108, when the division time 3014 included in the message division organization information 300a and the waveform division organization information 300b satisfies the synchronization determination condition 1081, the basic ID 3012 = P01 included in the division organization information 300a. -03 is stored in the related ID 3021 included in the divided organization information 300b, and the basic ID 3012 = W01-03 included in the divided organization information 300b is stored in the related ID 3021 included in the divided organization information 300a.
The same operation is repeated thereafter.

  The synchronization determination condition 1081 may be “the difference between the division times is equal to or less than a threshold” or “the value obtained by adding an offset to the difference between the division times is equal to or less than the threshold”. Further, the threshold value may be a constant value, or a different value may be set for each communication protocol included in the communication message 200a with division and organization information.

The analysis waveform information generation procedure 1C will be described.
The analysis waveform information generation means 109 is notified by the waveform signal storage means 104 with division organization information, and includes message division organization information 300a having the related ID 3021 of the waveform division organization information 300b of the waveform signal with division organization information 200b as a basic ID 3012. The data type 3015, the analysis label 3031, and the analysis value 3032 are acquired by referring to the data. Subsequently, the analysis waveform information generating means 109 refers to the analysis site start position by referring to the analysis site determination table 1091 shown in FIG. 5 using the data type 3015 and the division position 3013 of the waveform division organization information 300b as search index keys. An analysis site end position is acquired, and a waveform signal in a range specified by the analysis site start position and the analysis site end position is extracted as an analysis site waveform signal 401a. The data of the analysis site determination table 1091 may be set at the time of system introduction, or a waveform signal obtained based on an evaluation test before the system introduction is accumulated, and statistics are collected on the accumulated waveform signal. You may make it set the data determined by taking. Then, each time the analysis part waveform signal 401a is extracted, the analysis waveform information generation unit 109 generates the analysis waveform information 400a as shown in FIG. 6, and the analysis part waveform signal 401a, the data type 3015, and the analysis label 3031 are generated. And the analysis value 3032 are stored in the analysis waveform information 400a, and this analysis waveform information 400a is notified to the analysis waveform information storage means 110.

  The analysis waveform information storage means 110 notifies the waveform feature quantity calculation means 111 of the analysis waveform information 400a notified by the analysis waveform information storage means 109 that the feature quantity calculation flag is not set, and the feature quantity calculation flag is set. If the communication status determination flag is not set, the communication status determination means 113 is notified.

The waveform feature quantity calculation unit 111 sets a feature quantity calculation flag included in the analysis waveform information 400a that is not set by the feature quantity calculation flag notified by the analysis waveform information storage unit 110, and the waveform feature quantity calculation unit 111 has a feature. The following processing is performed for all the quantity calculators 1111.
The data type 3015 included in the analysis waveform information 400a and the calculation target data 11112 included in the feature amount calculator 1111 are selected.
The analysis part waveform signal 401a included in the analysis waveform information 400a is input to the selected feature amount calculator 1111. The output result of the feature amount calculator 1111 is input to the feature amount 403a included in the analysis waveform information 400a. The feature amount label 11111 included in the feature amount calculator 1111 is stored in the feature amount label 402a.

  Note that one of the feature quantity calculators 1111 may be a Fourier transformer that derives the frequency component of the waveform signal, an IQ calculator that derives the in-phase and out-of-phase components of the waveform signal, An MER calculator that derives the amount of disturbance of in-phase and out-of-phase components may be used.

The communication state determination procedure 1D will be described.
The communication state determination unit 113 is notified by the analysis waveform information storage unit 110, sets the state determination flag included in the analysis waveform information in which the feature amount calculation flag is set and the communication state determination flag is not set, and the analysis waveform information 400a The ideal waveform information 400b having the data type 3015 included in is acquired from the ideal waveform information storage unit 112.
The analysis waveform information 400a and the ideal waveform information 400b are compared with each other, and a comparison value is obtained by comparing the analysis part waveform signal and the feature amount. Further, the comparison value is input to the communication state determination table 1131 to obtain a communication state value 404a, which is stored in the analysis waveform information 400a.

The comparison value of the analysis site waveform signal may be a difference between the maximum value or average value of the amplitude. The comparison value of the feature value may be a power difference of a specific frequency if the feature value is a frequency component, or may be a difference of amplitude dispersion or a difference of phase dispersion if the feature value is an in-phase / different-phase component.
The communication state value may be an aged deterioration state or a failure part name of a transmission / reception terminal, may be a transmission line length between transmission / reception terminals or an aged deterioration state, or may be the number of terminals connected to the entire transmission line, It may be the name of a noise source that adds noise to the waveform signal 201b.
The contents of these quantitative evaluations are as shown in FIG.

  The analysis result display means 114 acquires the analysis waveform information 400a designated automatically or by an operator's manual instruction from the analysis waveform information storage means 110, and if the state determination flag included in the analysis waveform information 400a is set , Display this content.

  As an application example of the present invention, there is a communication abnormality analysis tool for a communication network such as a building air conditioning system.

1 is a block diagram showing a configuration of a communication analysis device 100 in an embodiment of the present invention. FIG. 6 is a diagram showing a configuration of data 200 with division organization information. 3 is a diagram showing a configuration of division organization information 300. FIG. 6 is a conceptual diagram showing a method of associating a communication message 201a and a waveform signal 201b using the division organization information 300 performed by the synchronization determination means 108. FIG. 10 is a diagram showing a configuration of an analysis site determination table 1091. FIG. FIG. 6 is a conceptual diagram showing a generation process and configuration of analysis waveform information 400a. It is a figure which shows the content of the quantitative evaluation which the communication status determination means 113 implements.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100: Communication analyzer, 101: Communication means, 102: Waveform measurement means, 103: Communication message storage means with division arrangement information, 104: Waveform signal storage means with division arrangement information, 105: Message division arrangement information provision means, 106: Waveform division organization information adding means 107: Message analysis means 108: Synchronization determination means 114: Analysis result display means 200: Data with division arrangement information 200a: Communication message with division arrangement information 200b: Waveform with division arrangement information 201: data, 201a: communication message, 201b: waveform signal, 202: data information, 202a1: message acquisition time, 202b1: waveform acquisition time, 203: division organization information processing flag, 203a1: communication unit extraction flag, 203a2: Message analysis flag, 203a3: synchronization determination flag, 203b1: communication unit extraction flag, 203b : Synchronization determination flag, 300: division organization information, 300a: message division organization information, 300b: waveform division organization information, 301: basic information, 302: related information, 303: analysis information, 400a: analysis waveform information, 400b: ideal waveform Information, 401a: analysis part waveform signal, 402a: feature quantity label, 403a: feature quantity, 404a: communication state value, 1071: message analyzer, 10711: message analyzer label, 10712: message analysis target, 1091: determination of analysis part Table, 1111: feature amount calculator, 11111: feature amount label, 11112: calculation target data, 1131: communication state determination table, 3011: division unit, 3012: basic ID, 3013: division position, 3014: division time, 3015: Data type, 3021: Related ID, 3031: Analysis label, 3032: Analysis value 10911: Analysis site starting position, 10912: Analysis site end position.

Claims (16)

In a communication analysis device connected to a transmission path through which a message in a predetermined communication protocol is transmitted and received between a plurality of devices,
Ideal waveform information storage means for holding an ideal waveform signal in the communication protocol;
Analysis waveform information generating means;
Communication state determination means,
The analysis waveform information generation means extracts, as an analysis waveform signal, a portion of the waveform signal received from the transmission path that corresponds to the ideal waveform signal and time,
The communication state determination unit estimates the communication state of the transmission path based on the analysis waveform signal extracted by the analysis waveform information generation unit and the ideal waveform signal stored in the ideal waveform information storage unit. Communication analysis device. In a communication analysis device connected to a transmission path through which messages are transmitted and received between multiple devices,
An ideal waveform information storage means for holding an ideal waveform signal in a predetermined communication protocol;
Analysis waveform information generating means;
Communication state determination means,
The analysis waveform information generation means extracts a telegram having a communication protocol that matches the communication protocol of the ideal waveform signal from the telegram received from the transmission path, and a waveform signal corresponding to the telegram, and further, among the extracted waveform signals, The portion corresponding to the ideal waveform signal and time is extracted as an analysis waveform signal,
The communication state determination unit estimates the communication state of the transmission path based on the analysis waveform signal extracted by the analysis waveform information generation unit and the ideal waveform signal stored in the ideal waveform information storage unit. Communication analysis device. A waveform feature amount calculating means for calculating a feature amount of the analysis waveform signal and a feature amount of the ideal waveform signal;
2. The communication state determining unit estimates the communication state of the transmission path by comparing a feature amount of an analysis waveform signal output from the waveform feature amount calculating unit with a feature amount of an ideal waveform signal. Or the communication analysis apparatus of Claim 2.   The communication analysis apparatus according to claim 3, wherein the feature amount calculated by the waveform feature amount calculation unit includes a phase component when the analysis waveform signal and the ideal waveform signal are divided by a predetermined width.   The communication analysis apparatus according to claim 4, wherein the communication state determination unit compares the analysis waveform signal with the ideal waveform signal based on a variance difference in a predetermined width of the phase component.   The communication analysis device according to claim 3, wherein the feature amount calculated by the waveform feature amount calculation unit includes an amplitude component when the analysis waveform signal and the ideal waveform signal are divided by a predetermined width. .   The communication analysis apparatus according to claim 6, wherein the communication state determination unit compares the analysis waveform signal with the ideal waveform signal based on a difference in variance of the amplitude component within a predetermined width. Having synchronization determination means;
The communication analysis apparatus according to claim 2, wherein the synchronization determination unit associates a waveform signal transmitted from the transmission path with a communication message transmitted from the transmission path by time. Having analysis waveform information storage means,
9. The communication analysis apparatus according to claim 8, wherein the analysis waveform information storage unit stores the analysis waveform signal and a communication message associated with the waveform signal together.   The communication analysis apparatus according to claim 9, wherein the communication state estimated by the communication state determination unit includes an aging deterioration state of the transmission path.   The communication analysis apparatus according to claim 9, wherein the communication state estimated by the communication state determination unit includes a transmission path length connecting a transmission source terminal and a transmission destination terminal of the analysis waveform signal.   The communication analysis apparatus according to claim 9, wherein the communication state estimated by the communication state determination unit includes a failure part of a transmission source terminal or a transmission destination terminal of the analysis waveform signal.   The communication analysis apparatus according to claim 9, wherein the communication state estimated by the communication state determination unit includes the number of terminals connected to the entire transmission path.   The communication analysis apparatus according to claim 9, wherein the communication state estimated by the communication state determination unit includes a noise source name. Having communication means and waveform measuring means,
The communication means sequentially receives the communication message from the transmission path and the acquisition time of the communication message and notifies the first storage means,
The waveform measuring means sequentially receives the waveform signal from the transmission path and the acquisition time of the waveform signal and notifies the second storage means,
The first storage means stores the communication message and its acquisition time,
The second storage means stores the waveform signal and its acquisition time,
The synchronization determination unit operates when a difference between a communication message acquisition time stored in the first storage unit and a waveform signal acquisition time stored in the second storage unit is equal to or less than a predetermined value. The communication analysis device according to claim 8. Having analysis result display means,
The communication analysis apparatus according to claim 1, wherein the analysis result display unit displays a communication state of the transmission path estimated by the communication state determination unit.

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