JP2020088652A - Apparatus and method for measuring error rate - Google Patents

Abstract

To provide an apparatus and a method for measuring an error rate, which can display the history information of coding processing or decoding processing executed on the pattern data of a pulse pattern signal to be input to a test target.SOLUTION: The error rate measuring apparatus includes: coding processing unit 22 and decoding processing unit 23 which, according to the operation of an operation unit 27, perform coding processing and decoding processing, respectively, on pattern data displayed on a pattern editor 21; a pattern file generation unit 24 which generates a pattern file, including the pattern data coded or decoded by the coding processing unit 22 or the decoding processing unit 23 and the history information of the coding processing or the decoding processing by the coding processing unit 22 or the decoding processing unit 23. When the pattern file is opened by the pattern editor 21 through the operation of the operation unit 27, the pattern editor 21 displays the coded or decoded pattern data and the history information.SELECTED DRAWING: Figure 1

Description

The present invention relates to an error rate measuring apparatus and an error rate measuring method, and more particularly to an error rate measuring apparatus and an error rate measuring method in which a user can edit pattern data of a test signal used for error rate measurement.

2. Description of the Related Art In recent years, communication systems have been increasing in speed, and the performance of electronic devices and communication devices that make up the communication systems is increasing. When evaluating the quality of equipment compatible with such a high-speed communication system, a test using an error rate measuring device using a pulse pattern signal such as a pseudo random pattern (PN) is widely performed.

The error rate measuring device transmits a pulse pattern signal to a device to be tested (Device Under Test: DUT), compares the transmitted pulse pattern signal with the pulse pattern signal returned from the DUT, and detects a bit error. It is a device for detecting.

The conventional error rate measuring device as described above includes a plurality of pulse pattern generator modules and a plurality of error detector modules, respectively, and by combining them with a multiplexer or a demultiplexer, a high bit rate pulse pattern signal is obtained. It is possible to perform error detection by.

In recent years, a user can arbitrarily create and edit pattern data of a test pulse pattern signal used for error rate measurement, and perform arbitrary coding processing and decoding processing on the pattern data of the pulse pattern signal. There is a demand for an error rate measuring device capable of performing the above.

As a device that allows a user to arbitrarily create and edit pattern data, a waveform editor system has been proposed that generates simulation waveform data to be added to a simulator that performs a simulation for confirming the operation of a logic circuit (for example, Patent Document 1). reference).

JP-A-8-194721

However, when the conventional waveform editor system as disclosed in Patent Document 1 displays the pattern data that has been subjected to the coding process or the decoding process, what kind of coding process or decoding is performed on the pattern data. There is a problem that the user cannot know in what order the processing (hereinafter, also simply referred to as “coding”) is performed. Therefore, for example, the user may perform the same coding a plurality of times on the displayed pattern data, and it may not be possible to obtain the pattern data in a state in which desired coding is performed.

The present invention has been made in order to solve such a conventional problem, and provides the history information of the encoding process or the decoding process performed on the pattern data of the pulse pattern signal to be input to the device under test. An object is to provide an error rate measuring device and an error rate measuring method that can display.

In order to solve the above problems, the error rate measurement apparatus according to the present invention is an operation unit that receives an operation input, a pulse pattern generator that generates a pulse pattern signal to be input to a device under test, and the pulse pattern signal. Error detector for detecting an error in the signal under measurement by comparing the signal under measurement output from the device under test with the input of the pulse pattern signal and displaying pattern data of the pulse pattern signal. Pattern data display means, coding means for performing coding processing or decoding processing on the pattern data displayed on the pattern data display means in accordance with the operation of the operation part, and for coding by the coding means or A pattern file generating unit that generates a pattern file including the decoded pattern data and history information of the encoding process or the decoding process by the coding unit, and displays the pattern data by operating the operation unit. When the pattern file is opened by the means, the pattern data display means displays the encoded or decoded pattern data and the history information.

With this configuration, the error rate measurement device according to the present invention can display the history information of the encoding process or the decoding process performed on the pattern data of the pulse pattern signal to be input to the device under test. This allows the user to know what kind of coding was performed on the pattern data, in what order, and when. Therefore, the error rate measurement device according to the present invention has a problem that the user applies the same coding to the pattern data a plurality of times, and it becomes impossible to obtain the pattern data in a desired coding state. It can be avoided.

Further, in the error rate measurement device according to the present invention, the pulse pattern signal may be an NRZ signal or a PAM4 signal.

Further, in the error rate measuring apparatus according to the present invention, the coding means performs any of 8b/10b, 64b/66b, 128b/130b, 128b/132b, or forward error correction on the pattern data of the NRZ signal. The configuration may be such that the encoding process or the decoding process based on the or is performed.

Further, in the error rate measuring device according to the present invention, the coding means performs a coding process or a decoding process on the pattern data of the PAM4 signal based on any one of Gray code, precode, and forward error correction. It may be configured to perform.

Further, the error rate measuring method according to the present invention is an operation unit that receives an operation input, a pulse pattern generator that generates a pulse pattern signal for input to an object to be tested, and the input of the pulse pattern signal, An error detector for detecting an error in the signal under measurement by comparing the signal under measurement output from the device under test with the pulse pattern signal, and pattern data display means for displaying pattern data of the pulse pattern signal. An error rate measuring method using an error rate measuring apparatus comprising: a coding for performing an encoding process or a decoding process on the pattern data displayed on the pattern data display means according to an operation of the operation unit. And a pattern file generation step of generating a pattern file including the pattern data coded or decoded in the coding step and history information of the coding process or the decoding process in the coding step, and the operation unit. When the pattern file is opened by the pattern data display means by the operation of, the pattern data display means displays the encoded or decoded pattern data and the history information. Is.

With this configuration, the error rate measuring method according to the present invention can display the history information of the encoding process or the decoding process performed on the pattern data of the pulse pattern signal to be input to the device under test. This allows the user to know what kind of coding was performed on the pattern data, in what order, and when. Therefore, the error rate measuring method according to the present invention has a problem that the user applies the same coding to the pattern data a plurality of times, and it becomes impossible to obtain the pattern data in a desired coding state. It can be avoided.

The present invention provides an error rate measuring device and an error rate measuring method capable of displaying history information of an encoding process or a decoding process performed on pattern data of a pulse pattern signal to be input to a device under test. Is.

It is a block diagram which shows the structure of the error rate measuring apparatus which concerns on embodiment of this invention. 6 is a table for explaining an encoding process and a decoding process based on the Gray code. It is a figure which shows the example of a display of the operation screen of the pattern editor for opening a pattern file. It is a figure which shows the example of a display in the pattern editor of the pattern file containing the pattern data which is not coded. It is a figure (the 1) which shows the example of a display of the wizard screen of a pattern editor. It is a figure (the 2) which shows the example of a display of the wizard screen of a pattern editor. It is a figure (the 3) which shows the example of a display of the wizard screen of a pattern editor. It is a figure which shows the example of a display of the wizard screen of a pattern editor (the 4). 4 is a table showing abbreviations for each coding type. It is a figure which shows the example of a display of the operation screen of the pattern editor for saving a pattern file. It is a figure which shows the example of a display in the pattern editor of the pattern file containing the coded pattern data. It is a figure which shows an example of the content of a pattern file. 6 is a flowchart showing processing of an error rate measuring method using the error rate measuring apparatus according to the embodiment of the present invention.

An embodiment of an error rate measuring device and an error rate measuring method according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the error rate measurement device 100 according to the present embodiment includes a measurement unit 10, a pattern data output unit 20, and a control unit 30.

The measurement unit 10 includes, for example, a synthesizer 11, a jitter modulation source 12, an error detector 13, a pulse pattern generator 14, and a noise generation source 15.

The DUT 200 is arranged to output the signal under measurement output from the DUT 200 in response to the input of the test signal from the noise generation source 15 to the error detector 13. Examples of standards supported by the DUT 200 include PCI Express (registered trademark), USB (registered trademark) (Universal Serial Bus), CEI (Common Electrical Interface), Ethernet (registered trademark), InfiniBand, and the like.

The jitter modulation source 12 adds a desired jitter to the clock generated by the synthesizer 11 to generate a jitter clock.

The pulse pattern generator 14 generates a pulse pattern signal to be input to the DUT 200, and outputs the generated pulse pattern signal to the noise generation source 15. For example, the pulse pattern generator 14 uses the jitter clock input from the jitter modulation source 12 to generate a pulse pattern signal of pattern data input from the storage unit 25 of the pattern data output unit 20 described later.

The pulse pattern signal generated by the pulse pattern generator 14 is, for example, an NRZ signal, an RZ signal, or a PAM4 signal. Examples of other pulse pattern signals generated by the pulse pattern generator 14 include NRZ-PSK signals, NRZ-DPSK signals, NRZ-DQPSK signals, RZ-DPSK signals, RZ-DQPSK signals, PAM8 signals, and PAM16 signals. Can be mentioned.

The noise generation source 15 applies to the DUT 200 a stress signal obtained by adding jitter or voltage noise to the pulse pattern signal output from the pulse pattern generator 14, or the pulse pattern signal itself output from the pulse pattern generator 14 as a test signal. It is designed to output.

The error detector 13 compares the signal under measurement from the DUT 200 with the test signal to detect the bit error rate of the signal under measurement.

It is also possible to perform error detection at a higher bit rate by providing a plurality of pulse pattern generators 14 and error detectors 13 in the measurement unit 10 and combining them with a multiplexer or demultiplexer. ..

The pattern data output unit 20 includes a pattern editor 21, an encoding processing unit 22, a decoding processing unit 23, a pattern file generation unit 24, a storage unit 25, a display unit 26, and an operation unit 27. The pattern editor 21 and the display unit 26 constitute pattern data display means. Further, the encoding processing unit 22 and the decoding processing unit 23 form a coding means.

The pattern editor 21 is for displaying and editing the pattern data of the pulse pattern signal generated by the pulse pattern generator 14.

The encoding processing unit 22 performs an encoding process on the pattern data displayed on the pattern editor 21 according to the operation of the operation unit 27 by the user. The encoding processing unit 22 encodes the pattern data of the PAM4 signal based on, for example, any one of a Gray code, a precode, and a forward error correction (FEC). It is designed to process. Further, the encoding processing unit 22 performs the encoding processing on the pattern data of the NRZ signal based on any of 8b/10b, 64b/66b, 128b/130b, 128b/132b, or FEC, for example. It has become.

The decryption processing unit 23 performs a decryption process on the pattern data displayed on the pattern editor 21 according to the operation of the operation unit 27 by the user. The decoding processing unit 23 is configured to perform decoding processing on the pattern data of the PAM4 signal based on, for example, any one of Gray code (Gray Code), precode (Precode), and FEC. Further, the decoding processing unit 23 is configured to perform decoding processing on the pattern data of the NRZ signal based on, for example, 8b/10b, 64b/66b, 128b/130b, 128b/132b, or FEC. ing.

Here, the encoding processing based on the Gray code by the encoding processing unit 22 includes two bits of “00”, “01”, “10”, and “11” representing four levels of the PAM4 method in the pattern data, respectively. This is coding for conversion as shown in FIG. The same conversion as the above-described encoding is performed for the decoding based on the Gray code by the decoding processing unit 23.

In the encoding process based on the precode by the encoding processing unit 22, the leading 2 bits of the pattern data are left as they are, and the coding is performed to obtain the difference between the leading 2 bits of the bit string that follows. On the other hand, in the decoding processing based on the precode by the decoding processing unit 23, coding is performed to add the above-mentioned two leading bits to the subsequent bit string.

FEC is a kind of error control technique in data transfer. In the FEC-based encoding process by the encoding processing unit 22, a process of adding redundant bits to a bit string of pattern data is performed. On the other hand, in the FEC-based decoding process by the decoding processing unit 23, a process of restoring a bit string of pattern data using redundant bits is performed.

In the encoding processing based on 8b/10b by the encoding processing unit 22, 8-bit data is converted into 10-bit data for the bit string of the pattern data, and the low level or high level state is long-term or irregular. By suppressing the continuation, the process of embedding the clock in the pattern data is performed. On the other hand, in the decoding process based on 8b/10b by the decoding processing unit 23, a process of converting 10-bit data into 8-bit data is performed on the bit string of the pattern data.

In the encoding processing based on 64b/66b by the encoding processing unit 22, the 64-bit data is converted into 66-bit data for the bit string of the pattern data, and the low level or high level state is long-term or irregular. By suppressing the continuation, the process of embedding the clock in the pattern data is performed. On the other hand, in the decoding process based on 64b/66b by the decoding processing unit 23, a process of converting 66-bit data into 64-bit data for a bit string of pattern data is performed.

In the encoding processing based on 128b/130b by the encoding processing unit 22, the 128-bit data is converted into 130-bit data for the bit string of the pattern data, and the low level or high level state is long-term or irregular. By suppressing the continuation, the process of embedding the clock in the pattern data is performed. On the other hand, in the decoding processing based on 128b/130b by the decoding processing unit 23, processing of converting 130-bit data into 128-bit data is performed on the bit string of the pattern data.

In the encoding processing based on 128b/132b by the encoding processing unit 22, the 128-bit data is converted into 132-bit data for the bit string of the pattern data, and the low level or high level state is long-term or irregular. By suppressing the continuation over, the process of embedding the clock in the pattern data is performed. On the other hand, in the decoding process based on 128b/132b by the decoding processing unit 23, a process of converting 132-bit data into 128-bit data is performed on the bit string of the pattern data.

The pattern file generation unit 24 is configured to generate a pattern file including pattern data encoded by the encoding processing unit 22 and history information of the encoding processing by the encoding processing unit 22. When such a pattern file is opened in the pattern editor 21 by the user operating the operation unit 27, the coded pattern data and the history information of the encoding process are displayed on the pattern editor 21.

Further, the pattern file generation unit 24 is configured to generate a pattern file including the pattern data decoded by the decoding processing unit 23 and the history information of the decoding processing by the decoding processing unit 23. When such a pattern file is opened in the pattern editor 21 by the user operating the operation unit 27, the decoded pattern data and the history information of the decoding process are displayed in the pattern editor 21.

The pattern file including the pattern data that has been subjected to both the encoding processing by the encoding processing unit 22 and the decoding processing by the decoding processing unit 23 is the history information of the encoding processing by the encoding processing unit 22 and the decoding processing. It includes both the history information of the decoding processing by the unit 23 and the history information. When such a pattern file is opened in the pattern editor 21 by the user operating the operation unit 27, the pattern data encoded and decoded and the history information of the encoding process and the decoding process are displayed in the pattern editor 21. Is displayed.

Further, it is desirable that the history information includes information that specifies the pattern data before being encoded by the encoding processing unit 22 and information that specifies the pattern data before being decoded by the decoding processing unit 23. The information that specifies the pattern data is, for example, the file name of the pattern file that includes the pattern data before being encoded or decoded.

The pattern file generator 24 can also generate a pattern file containing raw pattern data that has not been subjected to encoding processing or decoding processing.

The storage unit 25 includes a pattern file including raw pattern data generated by the pattern file generation unit 24 that has not been subjected to encoding processing or decoding processing, and a pattern file including pattern data subjected to encoding processing or decoding processing. It is designed to remember and.

The display unit 26 is composed of, for example, a display device such as an LCD or a CRT, and displays various display contents of the pattern editor 21 according to a control signal output from the control unit 30. The display content includes pattern data of the pulse pattern signal, history information of coding the pattern data, and the like. Further, the display unit 26 is adapted to display operation targets such as buttons, soft keys, pull-down menus, and text boxes for setting measurement conditions for error rate measurement.

The operation unit 27 is for receiving an operation input by the user, and is configured by, for example, a touch panel provided on the surface of the display screen of the display unit 26. Alternatively, the operation unit 27 may include an input device such as a keyboard or a mouse. For example, the user can use the operation unit 27 to perform operations such as opening a desired pattern file and performing desired coding on the pattern data.

The control unit 30 is composed of, for example, a microcomputer including a CPU, a ROM, a RAM, a HDD, a personal computer, or the like, and controls the operation of each of the above units that constitute the error rate measurement device 100.

The pattern editor 21 and the pattern file generation unit 24 may be configured as software by executing a predetermined program by the control unit 30, for example. Further, the encoding processing unit 22 and the decoding processing unit 23 are configured by digital circuits such as FPGA (Field Programmable Gate Array) and ASIC (Application Specific Integrated Circuit), and the control unit 30 executes a predetermined program. Can be configured by software. Alternatively, the pattern editor 21, the pattern file generation unit 24, the encoding processing unit 22, and the decoding processing unit 23 can be configured by appropriately combining hardware processing by a digital circuit and software processing by a predetermined program. ..

Hereinafter, an example of the operation of the pattern editor 21 will be described.

FIG. 3 shows a state in which a pattern file having the file name "bbb.txt" is selected on the operation screen 31 for opening the pattern file displayed on the display unit 26 by the user operating the operation unit 27. There is. When the Open button 32 is pressed by the user operating the operation unit 27, "bbb.txt" is opened on the pattern editor 21 as shown in FIG.

As shown in FIG. 4, the display screen 33 of the pattern editor 21 includes a pattern data display area 34 for displaying the pattern data in a text format, and an encoding process and a decoding process for the pattern data displayed in the pattern data display area 34. A history information display area 35 for displaying history information in a text format, and a Save with codings button 36 for performing an encoding process or a decoding process on the pattern data displayed in the pattern data display region 34 and saving the pattern data. , And a pattern data input area 37 for inputting pattern data in a text format.

FIG. 4 shows a state in which the pattern data included in “bbb.txt” is displayed in the pattern data display area 34 of the pattern editor 21. When the Save with codings button 36 is pressed by the operation unit 27, the Save with codings wizard screen W1 as shown in FIG. 5 is displayed on the display unit 26.

As shown in FIG. 5, the Save with codings wizard screen W1 is an Encode (encoding process) for the pattern data displayed in the pattern data display area 34 of the pattern editor 21 by the encoding processing unit 22 or the decoding processing unit 23. Or, it has radio buttons 38a and 38b for selecting which of decoding (Decoding) is to be performed. Note that FIG. 5 shows a state in which the encoding process is selected by the radio button 38a. When the Next button N1 is pressed by the operation unit 27 in the state of FIG. 5, the Save with codings wizard screen W2 as shown in FIG. 6 is displayed on the display unit 26.

As shown in FIG. 6, the Save with codings wizard screen W2 has radio buttons 39a and 39b for selecting the type of pattern data displayed in the pattern data display area 34 of the pattern editor 21. Note that FIG. 6 shows a state in which PAM4 is selected by the radio button 39b. When the Next button N2 is pressed by the operation unit 27 in the state of FIG. 6, the Save with codings wizard screen W3 as shown in FIG. 7 is displayed on the display unit 26.

As shown in FIG. 7, the Save with codings wizard screen W3 indicates the type of coding executed by the encoding processing unit 22 or the decoding processing unit 23 for the pattern data displayed in the pattern data display area 34 of the pattern editor 21. It has check boxes 40a and 40b for selection. Since the encoding process is selected on the Save with codings wizard screen W1 of FIG. 5, only the type of encoding process can be selected in the example of FIG. Note that FIG. 7 shows a state in which the Gray code is selected by the check box 40a. When the Next button N3 is pressed by the operation unit 27 in the state of FIG. 7, the Save with codings wizard screen W4 as shown in FIG. 8 is displayed on the display unit 26.

The information selected on the Save with codings wizard screens W1 to W3 is saved in the <CodingHistory> tag of the pattern file by the pattern file generation unit 24. For example, in the <CodingHistory> tag, the date and time when the pattern data was coded or decoded, the file name of the pattern file before coded or decoded, and either the coding process or the decoding process for the pattern data Whether or not the type of the encoding process or the decoding process performed on the pattern data is stored. Below is an example of information stored in the <CodingHistory> tag.
<Coding History>
This File is encoded from xxx.ptn the following codings on Feb 1,2018 00:00:00.
-Gray Coding
-PAM4 Precode
</CodingHistory>

As shown in FIG. 8, the Save with codings wizard screen W4 indicates whether to add the abbreviation of the coding type selected on the Save with codings wizard screens W1 to W3 after the file name of the pattern file displayed in the pattern editor 21. It has a check box 41 for designating. Note that FIG. 8 shows a state in which the abbreviation of the coding type is selected after the file name of the pattern file by the check box 41.

Abbreviations for each coding type are defined as shown in FIG. 9, for example. For example, if the pattern data included in the pattern file with the file name "Pattern.txt" is PAM4 format data, and if this pattern data is decoded based on the Gray code and the precode, The pattern file generation unit 24 generates a pattern file including the decoded pattern data with the file name "Pattern_DeGryPrc.txt".

When the Next button N4 is pressed by the operation unit 27 in the state of FIG. 8, the operation screen 42 for saving the pattern file in the storage unit 25 is displayed on the display unit 26 as shown in FIG. When the Save button 43 is pressed, the pattern file with the file name "bbb_EnGry.txt" is created based on the information selected on the Save with codings wizard screens W1 to W4 in FIGS. And is stored in the storage unit 25. Further, the content of "bbb_EnGry.txt" is displayed in the pattern editor 21 as shown in FIG.

As shown in FIG. 11, pattern data after coding is displayed in a text format in the pattern data display area 34, and coding history information is displayed in a text format in the history information display area 35.

In FIG. 12, the coding processing unit 22 performs coding based on the Gray code with respect to the pattern data of the PAM4 signal in which the stage number n of the pseudo random pattern (PN) having the bit period of 2 ⁿ −1 is 7. An example of a pattern file in the case of

Hereinafter, an error rate measuring method using the error rate measuring apparatus 100 of the present embodiment will be described with reference to the flowchart of FIG. Here, the process of encoding the pattern data already stored in the storage unit 25 by the error rate measuring device 100 will be described as an example.

First, as shown in FIG. 3, the control unit 30 causes the display unit 26 to display the operation screen 31 for opening the pattern file (step S1).

Next, the control unit 30 reads from the storage unit 25 the pattern file (here, "bbb.txt") selected on the operation screen 31 by the operation of the operation unit 27 by the user, and as shown in FIG. 21 is displayed (step S2). If a pattern file including coding history information is selected in step S1, the pattern data and the history information thereof are displayed in the pattern editor 21 as shown in FIG.

Next, the control unit 30 detects whether the Save with codings button 36 has been pressed by the operation unit 27 (step S3).

Next, when the Save with codings button 36 is pressed by the operation unit 27, the control unit 30 causes the display unit 26 to display the Save with codings wizard screen W1 as shown in FIG. 5 (step S4).

Next, when the Next button N1 is pressed by the operation unit 27, the control unit 30 causes the display unit 26 to display the Save with codings wizard screen W2 as shown in FIG. 6 (step S5).

Next, when the Next button N2 is pressed by the operation unit 27, the control unit 30 causes the display unit 26 to display the Save with codings wizard screen W3 as shown in FIG. 7 (step S6).

Next, when the Next button N3 is pressed by the operation unit 27, the control unit 30 causes the display unit 26 to display the Save with codings wizard screen W4 as shown in FIG. 8 (step S7).

Next, when the Next button N4 is pressed by the operation unit 27, the encoding processing unit 22 uses the information set in the Save with codings wizard screens W1 to W4 shown in FIGS. The pattern data included in "bbb.txt" is encoded by the PAM4 gray code (coding step S8). In addition, when Decode (decoding process) is selected by the radio button 38b on the Save with codings wizard screen W1 of FIG. 5, the decoding process unit 23 performs the coding process on the pattern data included in "bbb.txt" at the coding step S8. And decryption is performed.

Next, the pattern file generation unit 24 generates a pattern file including the pattern data encoded or decoded in the coding step S8 and the history information of the coding in the coding step S8 (pattern file generation step S9).

Next, as shown in FIG. 10, the control unit 30 causes the display unit 26 to display the operation screen 42 for saving the pattern file in the storage unit 25 (step S10). At this time, "bbb_EnGry.txt" is displayed in the text box 44 indicating the file name of the pattern file to be saved.

Next, when the user operates the operation unit 27 to press the Save button 43, the pattern file generated in the pattern file generation step S9 is stored in the storage unit 25 under the name "bbb_EnGry.txt" ( Step S11).

Next, as shown in FIG. 11, the control unit 30 outputs the coded pattern data and the coding history information included in “bbb_EnGry.txt” stored in the storage unit 25 in step S11 to the pattern editor 21. Is displayed (step S12). When Decode (decoding process) is selected by the radio button 38b on the Save with codings wizard screen W1 of FIG. 5, the control unit 30 patterns the decoded pattern data and coding history information in step S12. Display in the editor 21.

As described above, the error rate measurement apparatus 100 according to the present embodiment includes the pattern data encoded or decoded by the encoding processing unit 22 and the decoding processing unit 23, and the encoding processing unit 22 and the decoding processing unit 23. By generating a pattern file including the history information of the encoding process or the decoding process, it is possible to display the history information of the encoding process or the decoding process applied to the pattern data of the pulse pattern signal to be input to the DUT 200. it can.

With the above configuration, the user can know what coding was performed on the pattern data in what order and when. Therefore, in the error rate measurement apparatus 100 according to the present embodiment, the user applies the same coding to the pattern data a plurality of times, and it becomes impossible to obtain the pattern data in a desired coding state. The problem can be avoided. For example, in PAM4, it is necessary to apply the gray code to the pattern data before applying the precode to the pattern data. However, if the gray code and the precode are applied to the pattern data that has already been gray coded, the gray code will be grayed out. The code and the gray code cancel each other out, and only the precode is applied, which is not the code expected by the user. The error rate measuring apparatus 100 according to this embodiment can avoid such a problem.

10 measurement section 11 synthesizer 12 jitter modulation source 13 error detector 14 pulse pattern generator 15 noise source 20 pattern data output section 21 pattern editor 22 encoding processing section 23 decoding processing section 24 pattern file generating section 25 storage section 26 display section 27 Operation Unit 30 Control Unit 100 Error Rate Measuring Device 200 DUT

Claims (5)

An operation unit (27) for receiving an operation input,
A pulse pattern generator (14) for generating a pulse pattern signal for input to a device under test (200);
An error detector (13) for detecting an error in the signal under measurement by comparing the signal under measurement output from the device under test with the input of the pulse pattern signal with the pulse pattern signal,
Pattern data display means (21, 26) for displaying the pattern data of the pulse pattern signal,
Coding means (22, 23) for performing an encoding process or a decoding process on the pattern data displayed on the pattern data display device according to an operation of the operation unit;
A pattern file generation unit (24) for generating a pattern file including the pattern data encoded or decoded by the coding unit and history information of the encoding process or the decoding process by the coding unit;
When the pattern file is opened by the pattern data display unit by the operation of the operation unit, the pattern data display unit displays the encoded or decoded pattern data and the history information. Error rate measuring device. The error rate measuring device according to claim 1, wherein the pulse pattern signal is an NRZ signal or a PAM4 signal. The coding means performs a coding process or a decoding process on the pattern data of the NRZ signal based on any of 8b/10b, 64b/66b, 128b/130b, 128b/132b, or forward error correction. The error rate measuring device according to claim 2, which is characterized in that. The error according to claim 2, wherein the coding means performs a coding process or a decoding process on the pattern data of the PAM4 signal based on any one of Gray code, precode, and forward error correction. Rate measuring device. An operation unit (27) for receiving an operation input,
A pulse pattern generator (14) for generating a pulse pattern signal for input to a device under test (200);
An error detector (13) for detecting an error in the signal under measurement by comparing the signal under measurement output from the device under test with the input of the pulse pattern signal with the pulse pattern signal;
An error rate measuring method using an error rate measuring device (100) comprising: pattern data display means (21, 26) for displaying pattern data of the pulse pattern signal,
A coding step (S8) of performing an encoding process or a decoding process on the pattern data displayed on the pattern data display means according to an operation of the operation unit;
A pattern file generation step (S9) of generating a pattern file including the pattern data coded or decoded by the coding step and history information of the coding process or the decoding process by the coding step;
A step in which the pattern data display means displays the encoded or decoded pattern data and the history information when the pattern file is opened in the pattern data display means by an operation of the operation part (S2) , S12), and an error rate measuring method comprising:

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