Tektronix TekExpress Ethernet NBASE-T Compliance Solution Help Online Help

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TekExpress® Ethernet NBASE-T Compliance Solution

Printable Application Help

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TekExpress® Ethernet NBASE-T Compliance Solution

Printable Application Help

www.tek.com

077-1520-00

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material. Specifications and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Compiled Online Help Part number: 076-1520-00

Contacting Tektronix

Tektronix, Inc. 14150 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

For product information, sales, service, and technical support:

■

In North America, call 1-800-833-9200.

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Worldwide, visit www.tek.com to find contacts in your area.

Welcome .............................................................................................................................................. v

Getting help and support

Related documentation ................................................................................................................... 1

Conventions .................................................................................................................................... 2

Technical support ........................................................................................................................... 2

Getting started

Minimum system requirements ...................................................................................................... 5

Instruments and accessories required ............................................................................................. 6

Supported Probes and Power splitter .............................................................................................. 6

Installing the software .................................................................................................................... 7

View software version .................................................................................................................... 7

Application directories ................................................................................................................... 8

File name extensions ...................................................................................................................... 9

Operating basics

Launch the application .................................................................................................................. 11

Application panels overview ........................................................................................................ 12

Global application controls ........................................................................................................... 13

Application controls ................................................................................................................ 13

Options menu overview ........................................................................................................... 15

TekExpress instrument control settings .................................................................................. 17

View connected instruments ................................................................................................... 17

Configure email settings .......................................................................................................... 19

Setup panel ................................................................................................................................... 20

Setup panel overview .............................................................................................................. 20

Set DUT parameters ................................................................................................................ 21

Select tests ............................................................................................................................... 23

Set acquisition tab parameters ................................................................................................. 24

Set configuration tab parameters ............................................................................................. 26

Set preferences tab parameters ................................................................................................ 31

Status panel overview ................................................................................................................... 32

Results panel ................................................................................................................................. 33

Results panel overview ............................................................................................................ 33

TekExpress® Ethernet NBASE-T Printable Application Help i

Table of Contents

View test-related files .............................................................................................................. 34

Plots panel ..................................................................................................................................... 35

Plots panel overview ............................................................................................................... 35

Reports panel ................................................................................................................................ 37

Reports panel overview ........................................................................................................... 37

Select report options ................................................................................................................ 38

View a report ........................................................................................................................... 40

Report contents ........................................................................................................................ 41

Running tests

Equipment connection setup ......................................................................................................... 43

SMA Probe (Differential Source) ............................................................................................ 43

SMA Cable (Single-Ended Source) ........................................................................................ 44

Jitter-Slave SMA Probe (Differential Source) ........................................................................ 45

Jitter-Slave SMA Cable (Single-Ended Source) ..................................................................... 46

Return Loss Calibration ........................................................................................................... 48

Return Loss Setup ................................................................................................................... 51

Transmitter non-linear distortion with disturbing signal (Differential Source) ...................... 52

Transmitter non-linear distortion with disturbing signal (Single-Ended) ............................... 53

Prerequisite ................................................................................................................................... 54

Compensate the signal path ..................................................................................................... 54

Deskew .................................................................................................................................... 54

Signal path compensation for transmitter non-linear distortion with disturbing signals ........ 55

Running tests ................................................................................................................................ 56

Saving and recalling test setup

Test setup files overview .............................................................................................................. 57

Save a test setup ............................................................................................................................ 57

Open (load) a saved test setup ...................................................................................................... 58

Create a test setup from default settings ....................................................................................... 58

Create a test setup using an existing one ...................................................................................... 58

TekExpress Ethernet NBASE-T measurements

Maximum output droop ................................................................................................................ 59

Transmitter timing Jitter-Master ................................................................................................... 60

Transmitter timing Jitter-Slave ..................................................................................................... 62

Transmitter Power Spectral Density and Power level .................................................................. 64

Transmitter clock frequency ......................................................................................................... 66

ii TekExpress® Ethernet NBASE-T Printable Application Help

Table of Contents

Transmitter non-linear distortion .................................................................................................. 67

Transmitter non-linear distortion (with disturbing signals) .......................................................... 69

MDI return loss ............................................................................................................................. 71

SCPI commands

About SCPI command .................................................................................................................. 77

Socket configuration for SCPI commands ................................................................................... 77

TEKEXP:*IDN? ........................................................................................................................... 85

TEKEXP:*OPC? .......................................................................................................................... 85

TEKEXP:ACQUIRE_MODE ...................................................................................................... 86

TEKEXP:ACQUIRE_MODE? .................................................................................................... 86

TEKEXP:EXPORT ...................................................................................................................... 87

TEKEXP:INFO? ........................................................................................................................... 87

TEKEXP:INSTRUMENT ............................................................................................................ 88

TEKEXP:INSTRUMENT? .......................................................................................................... 88

TEKEXP:LASTERROR? ............................................................................................................. 89

TEKEXP:LIST? ............................................................................................................................ 89

TEKEXP:MODE .......................................................................................................................... 90

TEKEXP:MODE? ........................................................................................................................ 91

TEKEXP:POPUP ......................................................................................................................... 91

TEKEXP:POPUP? ........................................................................................................................ 92

TEKEXP:REPORT ...................................................................................................................... 92

TEKEXP:REPORT? ..................................................................................................................... 93

TEKEXP:RESULT? ..................................................................................................................... 93

TEKEXP:SELECT ....................................................................................................................... 94

TEKEXP:SELECT? ..................................................................................................................... 95

TEKEXP:SETUP .......................................................................................................................... 95

TEKEXP:STATE ......................................................................................................................... 96

TEKEXP:STATE? ........................................................................................................................ 96

TEKEXP:VALUE ........................................................................................................................ 97

TEKEXP:VALUE? ...................................................................................................................... 98

Command parameters list ............................................................................................................. 99

Examples ................................................................................................................................... 106

TekExpress® Ethernet NBASE-T Printable Application Help iii

Table of Contents

iv TekExpress® Ethernet NBASE-T Printable Application Help

Welcome

Welcome to the TekExpress® Ethernext NBASE-T Conformance Solution. The application provides turnkey testing & characterization solution for 10GBASE-T measurements as outlined in IEEE 802.3 Section 55, and for 5GBASE-T and

2.5GBASE-T as outlined in IEEE P802.3bz, Section 16; NBASE-T Spec Draft

2.3. Automation options help the customers to meet their conformance testing needs and generate detailed reports. User-defined Mode lets customers make changes to the test limits and perform margin testing as part of extended product characterization.

Key features of TekExpress Ethernet NBASE-T include:

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Comprehensive automated solution for NBASE-T, 2.5GBASE-T, 5GBASET and 10GBASE-T testing

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One-button selection of multiple tests and four-channel support

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Detailed test reports with margin and statistical information aid analysis

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User-defined mode enables flexible parameter control for characterization and margin analysis

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Single instrument analysis of time- and frequency-domain measurements

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Signal acquisition and analysis support for differential probes or direct SMA cabling

TekExpress® Ethernet NBASE-T Printable Application Help v

Welcome

vi TekExpress® Ethernet NBASE-T Printable Application Help

Getting help and support

Conventions

Help uses the following conventions:

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The term "Application," and "Software" refers to the TekExpress Ethernet NBASE-T Solution application.

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The term “DUT” is an abbreviation for Device Under Test.

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The term “select” is a generic term that applies to the two methods of choosing a screen item (button, control, list item): using a mouse or using the touch screen.

Table 2: Icon descriptions

Icon Meaning

This icon identifies important information.

This icon identifies conditions or practices that could result in loss of data.

Technical support

General Information

This icon identifies additional information that will help you use the application more efficiently.

Tektronix values your feedback on our products. To help us serve you better, please send us your suggestions, ideas, or comments on your application or oscilloscope. Contact Tektronix through mail, telephone, or the Web site,

www.tek.com.

When you contact Tektronix Technical Support, please include the following information (be as specific as possible):

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All instrument model numbers

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Hardware options, if any

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Probes used

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Your name, company, mailing address, phone number, FAX number

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Please indicate if you would like to be contacted by Tektronix about your suggestion or comments.

2 TekExpress® Ethernet NBASE-T Printable Application Help

Getting help and support

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Application Specific

Information

Software version number

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Description of the problem such that technical support can duplicate the problem

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If possible, save the setup files for all the instruments used and the application.

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If possible, save the TekExpress setup files, log.xml, *.TekX (session files and folders), and status messages text file.

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If possible, save the waveform on which you are performing the measurement as a .wfm file.

TekExpress® Ethernet NBASE-T Printable Application Help 3

Getting help and support

4 TekExpress® Ethernet NBASE-T Printable Application Help

Getting started

Minimum system requirements

The following table shows the minimum system requirements to install and run the TekExpress Ethernet NBASE-T application.

Table 3: System requirements

Component Description

Oscilloscope Tektronix MSO64

Processor Same as the oscilloscope

Operating System Windows 10

Memory Same as the oscilloscope

Hard Disk Same as the oscilloscope

Display Super VGA resolution or higher video adapter (800 x

Firmware

600 minimum video resolution for small fonts or 1024 x 768 minimum video resolution for large fonts). The application is best viewed at 96 dpi display settings

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TekScope 1.13.61 or above

Software

Other Devices

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IronPython 2.7.3 installed

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PyVisa 1.0.0.25 installed

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Microsoft .NET 4.0 Framework

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Microsoft Internet Explorer 7.0 SP1 or greater, or other Web browser for viewing reports

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Adobe Reader software 7.0 or greater for viewing portable document format (PDF) files

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Microsoft compatible mouse or compatible pointing device.

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Two USB ports (four USB ports recommended).

If TekExpress is running on an instrument that has a video resolution less than 800x600, connect and configure a second monitor to the instrument.

TekExpress® Ethernet NBASE-T Printable Application Help 5

Getting started

Instruments and accessories required

TekExpress Ethernet NBASE-T application is launched on MSO64 series oscilloscope. The following table lists the instruments and accessories required for this application.

Table 4: Instruments and accessories required for Ethernet NBASE-T application

Instrument/Accessory Model number Quantity

Arbitrary Waveform Generators AWG5200 Series 1

Arbitrary Function Generators

■

AFG3052C

AFG3102C

AFG3152C

AFG3252C

Supported Probes and Power splitter

The table gives the list of probes and power splitter recommended for the TekExpress Ethernet NBASE-T application.

Table 5: Recommended probes

Oscilloscope Model Differential probe Single-ended probe

MSO64 TDP3500 – Minimum of one

Table 6: Recommended power splitter for Transmitter non-linear distortion (with disturbing signal)

Power splitter Model

PSPL5331

and maximum of four are required

5331-118

SMA Cables – Minimum of two are required with golden connectors

Return Loss measurement does not support single-ended probe configuration.

Total number of splitters used should be equal to twice the number of lanes (D+ and D-) to be tested (used for combining disturbing signal with DUT test mode signal).

Additional splitters are required for testing multilane with AFG or AWG:

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AFG: two splitters for testing every additional lanes.

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AWG: additional splitters depending on the number of lanes to be tested.

6 TekExpress® Ethernet NBASE-T Printable Application Help

Installing the software

Getting started

Follow the steps to download and install the latest TekExpress Ethernet NBASET Solution. See Minimum system requirements for compatibility.

1. Type the URL www.tek.com in the address bar of web browser and click Software Downloads

2. Enter TekExpress Ethernet NBASE-T Solution in the Enter your keywords field, and click Search

3. Select the latest version of software and follow the instructions to download. Copy the executable file into the oscilloscope.

4. Double-click the executable and follow the on-screen instructions. The software is installed at C:\Program Files\Tektronix\TekExpress\TekExpress Ethernet NBASE-T\

5. Select Application > TekExpress Ethernet NBASE-T from the TekScope menu to launch the application.

View software version

Use the following instructions to view version information for the application and for the application modules such as the Programmatic Interface and the Programmatic Interface Client.

To view version information for Ethernet NBASE-T, click button in the TekExpress application and select About TekExpress.

NOTE. This example shows a typical Version Details dialog box, and may not reflect the actual values as shown when you open this item in the application.

TekExpress® Ethernet NBASE-T Printable Application Help 7

Getting started

Application directories

TekExpress Ethernet NBASE-T application

The TekExpress Ethernet NBASE-T application files are installed at the following location:

C:\Program Files\Tektronix\TekExpress\TekExpress Ethernet NBASE-T

The following table lists the application directory names and their purpose.

Table 7: Application directories and usage

Directory names Usage

Bin Contains TekExpress Ethernet NBASE-T application libraries

Compliance Suites Contains compliance-specific files

Examples Contains various support files

ICP Contains instrument and TekExpress Ethernet NBASE-T

application-specific interface libraries

Images Contains images of the TekExpress Ethernet NBASE-T

application

Lib Contains utility files specific to the TekExpress Ethernet NBASE-

T application

Report Generator Contains style sheets for report generation

Tools Contains instrument and TekExpress Ethernet NBASE-T

application-specific files

8 TekExpress® Ethernet NBASE-T Printable Application Help

Getting started

See also

File name extensions

View test-related files

File name extensions

The TekExpress Ethernet NBASE-T application uses the following file name extensions:

File name extension Description

.TekX Application session files (the extensions may not be displayed)

.py Python sequence file

.xml Test-specific configuration information (encrypted) files

Application log files

.wfm Test waveform files

.mht Test result reports (default)

Test reports can also be saved in HTML format

.pdf Test result reports

Application help document

.xslt Style sheet used to generate reports

See also

View test-related files

Application directories

TekExpress® Ethernet NBASE-T Printable Application Help 9

Getting started

10 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Launch the application

To launch the TekExpress Ethernet NBASE-T Solution, select Application > TekExpress Ethernet NBASE-T from the TekScope menu.

When you launch the application for the first time, the file C:\Users\<username> \My Documents\My TekExpress\Ethernet NBASE-T\Resources.xml is mapped to drive X:. This file contains information about available network-connected instruments. The session files are stored in X:\Ethernet NBASE-T\. If this file is not found, then the application runs Instrument Discovery Program to detect the connected instruments before launching Ethernet NBASE-T Solution.

If the application goes behind the oscilloscope application, click Application > Ethernet NBASE-T to bring it to the front. To keep the Ethernet NBASE-T application window on top, select Keep On Top from the Ethernet NBASETOptions menu.

TekExpress® Ethernet NBASE-T Printable Application Help 11

Operating basics

See also

Application controls

Application panel overview

Application panels overview

TekExpress Ethernet NBASE-T Solution uses panels to group related configuration, test, and results settings. Click any button to open the associated panel. A panel may have one or more tabs that list the selections available in that panel. Controls in a panel can change depending on settings made in that panel or another panel.

12 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Table 8: Application panels overview

Panel Name Purpose

Setup panel The Setup panel shows the test setup controls. Click the Setup button to

open this panel. Use this panel to:

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Set DUT tab parameters

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Select tests

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Set acquisition tab parameters

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Set configuration tab parameters

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Set preferences tab parameters

Status panel View the progress and analysis status of the selected tests, and view test

logs.

Results panel View a summary of test results and select result viewing preferences.

Plots View the plots for the measurements.

Reports panel Browse for reports, save reports as specific file types, specify report

naming conventions, select report content to include (such as summary information, detailed information, user comments, setup configuration, application configuration), and select report viewing options.

See also

Application controls

Global application controls

Application controls

This section describes the application controls.

TekExpress® Ethernet NBASE-T Printable Application Help 13

Operating basics

Table 9: Application controls description

Item Description

Options menu

Test Panel buttons

Menu to display global application controls.

Controls that open panels for configuring test settings and options.

Start / Stop button

Pause / Continue button

Clear button

Use the Start button to start the test run of the measurements in the selected order. If prior acquired measurements are not cleared, then new measurements are added to the existing set. The button toggles to the Stop mode while tests are running. Use the Stop button to abort the test.

Use the Pause button to temporarily pause the acquisition. When a test is paused, this button changes to “Continue.”

Use the Clear button to clear all existing measurement results. Adding or deleting a measurement, or changing a configuration parameter of an existing measurement, also clears measurements. This is to prevent the accumulation of measurement statistics or sets of statistics that are not coherent. This button is available only on Results panel.

14 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Item Description

Application window move icon

Minimize icon

Close icon

Place the cursor over the three-dot pattern in the upper left corner of the application window. When the cursor changes to a hand, drag the window to the desired location.

Click to minimize the application.

Click to close the application.

Options menu overview

Configure email settings

Use the Email Settings utility to get notified by email when a measurement completes, or produces any error condition. Follow the steps to configure email settings:

1. Select Options > Email Settings to open the Email Settings dialog box.

2. (Required) For Recipient email Address(es), enter one or more recipient

email addresses. To include multiple addresses, separate the addresses with commas.

3. (Required) For Sender’s Address, enter the email address used by the instrument. This address consists of the instrument name, followed by an underscore, followed by the instrument serial number, then the @ symbol, and the email server ID. For example: DSA8300_B130099@yourcompany.com.

4. (Required) In the Server Configuration section, type the SMTP Server address of the Mail server configured at the client location, and the SMTP Port number, in the corresponding fields.

If this server requires password authentication, enter a valid login name, password, and host name in the corresponding fields.

NOTE. If any of the above required fields are left blank, the settings will not be saved and email notifications will not be sent.

5. In the Email Attachments section, select from the following options:

■

Reports: Select to receive the test report with the notification email.

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Status Log: Select to receive the test status log with the notification email. If you select this option, then also select whether you want to receive the full log or just the last 20 lines.

6. In the Email Configuration section:

■

Enter a maximum file size for the email message. Messages with attachments larger than this limit will not be sent. The default is 5 MB.

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Enter the number in the Number of Attempts to Send field, to limit the number of attempts that the system makes to send a notification. The default is 1. You can also specify a timeout period.

7. Select the Email Test Results When complete or on error check box. Use this check box to quickly enable or disable email notifications.

8. To test your email settings, click Test Email.

9. To apply your settings, click Apply.

10. Click Close when finished.

TekExpress® Ethernet NBASE-T Printable Application Help 19

Operating basics

Email Settings

Setup panel

Setup panel overview

The Setup panel contains sequentially ordered tabs that help you guide through the test setup and execution process.

20 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Set DUT parameters

Use the DUT tab to select parameters for the device under test. This settings are global and apply to all tests for the current session. DUT settings also affect the list of available tests in the Test Selection tab.

TekExpress® Ethernet NBASE-T Printable Application Help 21

Operating basics

Click Setup > DUT to access the DUT parameters:

Table 10: DUT tab settings

Setting Description

DUT ID Adds an optional text label for the DUT to reports. The default value is

DUT001. The maximum number of characters is 32. You cannot use the following characters in an ID name: (.,..,...,\,/:?”<>|*)

Opens a Comments dialog box in which to enter optional text to add to a

Comments icon (to the right of the DUT ID field)

Acquire live waveforms Perform analysis on live waveforms.

Use pre-recorded waveform files

Data Rate

10GBASE-T Specification

5GBASE-T Specification

2.5GBASE-T

report. Maximum size is 256 characters. To enable or disable comments appearing on the test report. See Select report options for details.

Perform analysis on pre-recorded waveforms.

■

IEEE 802.3, Section 55

■

IEEE P802.3bz, Section 16; NBASE-T Spec Draft 2.3

Source

Differential Select the source as Differential

Single Ended Select the source as Single Ended

22 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Setting Description

Multi-Lane Select the number of lanes to test.

Setup Click to select the lanes to test.

Selected Test Lanes Displays the selected lanes.

Select tests

Figure 1: Test Lane Setup

Status panel overview

The Status button accesses the Test Status and Log View tabs, which provide status on test acquisition and analysis (Test Status tab) and a listing of test tasks performed (Log View tab). The application opens the Test Status tab when you start a test run. You can select the Test Status or the Log View tab to view these items while tests are running.

Test status view

Log view

32 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Table 15: Status panel Log View controls

Control Description

Message History Lists all executed test operations and timestamp

information.

Auto Scroll Enables automatic scrolling of the log view as

information is added to the log during the test.

Clear Log Clears all messages from the log view.

Save Saves the log file to a text file. Use the standard

Save File window to navigate to and specify the folder and file name to which to save the log text.

Results panel

Results panel overview

See also

Application panel overview

When a test finishes, the application automatically opens the Results panel to display a summary of test results.

TekExpress® Ethernet NBASE-T Printable Application Help 33

Operating basics

View test-related files

Files related to tests are stored in My TekExpress\Ethernet NBASE-T\. Each test setup in this folder has both a test setup file and a test setup folder, both with the test setup name.

The test setup file is preceded by the TekExpress icon and usually has no visible file name extension.

Inside the test setup folder is another folder named for the DUT ID used in the test sessions. The default is DUT001.

Inside the DUT001 folder are the session folders and files. Each session also has a folder and file pair, both named for the test session using the naming convention (date)_(time). Each session file is stored outside its matching session folder:

Each session folder contains image files of any plots generated from running the test session. If you selected to save all waveforms or ran tests using prerecorded waveform files, these are included here.

The first time you run a new, unsaved session, the session files are stored in the Untitled Session folder located at ..\My TekExpress\Ethernet NBASE-T\. When you name and save the session, the files are placed in a folder with the name that you specify. A copy of the test files stay in the Untitled Session folder until you run a new test or until you close the Ethernet NBASE-T application.

Plots panel

Plots panel overview

The Plots panel displays the result as a two-dimensional plot for additional measurement analysis. The plots are displayed only during run and only for the measurements which supports plots.

TekExpress® Ethernet NBASE-T Printable Application Help 35

Operating basics

Toolbar functions in plot windows. The Plot Toolbar window includes the following functions:

Icon Functions

Save

Select & Zoom

Zoom In

Saves the plot.

Expands the selected plot area. Left-click and drag the mouse to mark the region on the plot to zoom.

Expands part of the plot (Horizontal and Vertical); the data appears in more detail.

Contracts part of the plot (Horizontal and Vertical); the data appears in less detail.

Zoom Out

Pan

Hide Gridlines

Reset

Choose Waveform Colors

Moves the plot anywhere within the scale.

Hides the gridlines.

Resets the zoom to 100%.

Sets the plot color. Click and select the color in the Color window and click OK. Click in the plot area to apply the color.

36 TekExpress® Ethernet NBASE-T Printable Application Help

Reports panel

Icon Functions

Show/Hide Markers

UnDock/Dock

Select Test Select the measurement.

Displays or hides the markers

Click to undock/dock the plot window.

Operating basics

Reports panel overview

Use the Reports panel to browse for reports, name and save reports, select test content to include in reports, and select report viewing options.

For information on setting up reports, see Select report options. For information on viewing reports, see View a report.

TekExpress® Ethernet NBASE-T Printable Application Help 37

Operating basics

Select report options

Click the Reports button and use the Reports panel controls to select which test result information to include in the report, and the naming conventions to use for the report. For example, always give the report a unique name or select to have the same name increment each time you run a particular test.

Select report options before running a test or when creating and saving test setups. Report settings are included in saved test setups.

In the Reports panel, select from the following report options:

Table 16: Report options

Setting Description

Report Update Mode

Generate new report Creates a new report. The report can be in

either .mht or .pdf file formats.

Append with previous run session Appends the latest test results to the end of the

current test results report.

Replace current test in previous run session Replaces the previous test results with the latest

test results. Results from newly added tests are appended to the end of the report.

Report Creation Settings

38 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Setting Description

Report name Displays the name and location from which to

open a Ethernet NBASE-T report. The default location is at \My TekExpress\Ethernet NBASE- T\Untitled Session. The report file in this folder gets overwritten each time you run a test unless you specify a unique name or select to auto increment the report name. Change the report name or location.

Do one of the following:

■

In the Report Path field, type over the current folder path and name.

■

Double-click in the Report Path field and then make selections from the popup keyboard and click the Enter button.

Be sure to include the entire folder path, the file name, and the file extension. For example: C: \Documents and Settings\your user name\My Documents\My TekExpress\Ethernet NBASE-T \DUT001.mht.

NOTE. You cannot set the file location using the Browse button.

Open an existing report.

Click Browse, locate and select the report file and then click View at the bottom of the panel.

Save as type Saves a report in the specified file type, selected

from the drop-down list.

NOTE. If you select a file type different from the default, be sure to change the report file name extension in the Report Name field to match.

Auto increment report name if duplicate Sets the application to automatically increment

the name of the report file if the application finds a file with the same name as the one being generated. For example: DUT001, DUT002, DUT003. This option is enabled by default.

Create report automatically at the end of the run Creates report at the end of the run.

Contents To Save

Include pass/fail info in details table Includes pass/fail info in the details table of the

report.

Include detailed results Includes detailed results in the report.

Include plot images Includes plot images in the report.

TekExpress® Ethernet NBASE-T Printable Application Help 39

Operating basics

Setting Description

Include setup configuration Sets the application to include hardware and

software information in the summary box at the top of the report. Information includes: the oscilloscope model and serial number, the oscilloscope firmware version, and software versions for applications used in the measurements.

Include complete application configuration Includes complete application configuration in

the report.

Include user comments Select to include any comments about the test

that you or another user added in the DUT tab of the Setup panel. Comments appear in the Comments section, under the summary box at the beginning of each report.

Group Report By

Test Name Select to group the tests in the report by test

name.

Test Result Select to group the tests in the report by test

results

View a report

View report after generating Automatically opens the report in a Web browser

when the test completes. This option is selected by default.

View Click to view the most current report.

Generate Report Generates a new report based on the current

analysis results.

Save As Specify a name for the report.

The application automatically generates a report when test analysis is completed and displays the report in your default Web browser (unless you cleared the View Report After Generating check box in the Reports panel before running the test). If you cleared this check box, or to view a different test report, do the following:

1. Click the Reports button.

2. Click the Browse button and locate and select the report file to view.

3. In the Reports panel, click View.

For information on changing the file type, file name, and other report options, see

Select report options.

40 TekExpress® Ethernet NBASE-T Printable Application Help

Operating basics

Report contents

A report shows detailed results and plots, as set in the Reports panel.

Setup configuration information

The summary box at the beginning of the report lists setup configuration information. This information includes the oscilloscope model and serial number, optical module model and serial number, and software version numbers of all associated applications.

To exclude this information from a report, clear the Include Setup Configuration check box in the Reports panel before running the test.

User comments

If you selected to include comments in the test report, any comments you added in the DUT tab are shown at the top of the report.

Running tests

Equipment connection setup

Click Setup > Test Selection > Schematic to view the equipment setup diagram(s).

SMA Probe (Differential

Source)

This section describes the equipment connection setup to perform Differential Source (SMA Probe) Calibration. (For details, see Minimum system

requirements).

Equipment connection setup - Differential Source (SMA Probe) applies to all tests except Jitter-Slave, Return Loss and Transmitter non-linear distortion (with

disturbing signal).

TekExpress® Ethernet NBASE-T Printable Application Help 43

Running tests

Figure 3: SMA Probe (Differential Source)

SMA Cable (Single-Ended

Source)

44 TekExpress® Ethernet NBASE-T Printable Application Help

This section describes the equipments required and the connection setup to perform Single-Ended Source Calibration. (For details, see Minimum system

requirements).

Equipment connection setup - Single-Ended Source (SMA Cable) applies to all tests except Jitter-Slave, Return Loss and Transmitter non-linear distortion (with

disturbing signal).

Running tests

Figure 4: SMA Cable (Single-Ended Source)

Jitter-Slave SMA Probe

(Differential Source)

TekExpress® Ethernet NBASE-T Printable Application Help 45

This section describes the equipments required and the connection setup to perform Jitter-Slave (Differential Source) Calibration. (For details, see Minimum

system requirements).

Equipment connection setup - Jitter-Slave SMA Probe (Differential Source) applies to Jitter-Slave measurement.

Running tests

Figure 5: Jitter-Slave SMA Probe (Differential Source)

Jitter-Slave SMA Cable

(Single-Ended Source)

46 TekExpress® Ethernet NBASE-T Printable Application Help

This section describes the equipments required and the connection setup to perform Jitter-Slave (Single-Ended Source) calibration. (For details, see

Minimum system requirements).

Equipment connection setup - Jitter-Slave SMA Probe (Single-Ended Source) applies to Jitter-Slave measurement.

Running tests

Figure 6: Jitter-Slave SMA Cable (Single-Ended Source)

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Running tests

Return Loss Calibration

This section describes the equipments required and the connection setup to perform Return Loss Calibration. (For details, see Minimum system

requirements).

Equipment connection setup - Return Loss Calibration applies to Open Termination, Short Termination and Load Termination measurement.

Figure 7: Return Loss Calibration - Open Termination

48 TekExpress® Ethernet NBASE-T Printable Application Help

Running tests

Figure 8: Return Loss Calibration - Short Termination

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Running tests

Figure 9: Return Loss Calibration - Load Termination

50 TekExpress® Ethernet NBASE-T Printable Application Help

Running tests

Return Loss Setup

This section describes the equipments required and the connection setup to perform Return Loss Setup. (For details, see Minimum system requirements).

Equipment connection setup - Return Loss Setup applies to Return Loss measurement

Figure 10: Return Loss Setup

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Running tests

Transmitter non-linear

distortion with disturbing

signal (Differential Source)

This section describes the equipments required and the connection setup to perform Transmitter non-linear distortion with disturbing signal (Differential Source). (For details, see Minimum system requirements).

Figure 11: Transmitter non-linear distortion with disturbing signal (Differential Source)

NOTE. Total number of splitters used should be equal to twice the number of lanes (D+ and D-) to be tested (used for combining disturbing signal with DUT test mode signal).

NOTE. Additional splitters are required for testing multilane with AFG or AWG:

■

AFG: two splitters for testing every additional lanes.

■

AWG: additional splitters depending on the number of lanes to be tested.

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Running tests

Transmitter non-linear

distortion with disturbing

signal (Single-Ended)

This section describes the equipments required and the connection setup to perform Transmitter non-linear distortion with disturbing signal (Single-Ended). (For details, see Minimum system requirements).

Figure 12: Transmitter non-linear distortion with disturbing signal (Single-Ended)

NOTE. Total number of splitters used should be equal to twice the number of lanes (D+ and D-) to be tested (used for combining disturbing signal with DUT test mode signal).

NOTE. Additional splitters are required for testing multilane with AFG or AWG:

■

AFG: two splitters for testing every additional lanes.

■

AWG: additional splitters depending on the number of lanes to be tested.

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Running tests

Prerequisite

Compensate the signal

path

Use the following procedure to compensate the internal signal acquisition path. Perform this procedure if the ambient temperature has changed more than 5 °C (9 °F) since you performed the last signal path compensation. Perform the signal path compensation once a week. Failure to do so may result in the instrument not meeting warranted performance levels.

1. Power on and wait for the instrument to complete its warm up period before continuing with this procedure.

2. Disconnect any probes you have connected to the input channels.

3. Set the instrument to Menu mode.

4. Select Instrument Calibration from the Utilities menu.

5. Note any instructions that appear in the resulting control window.

6. Click Run SPC to begin the procedure. The procedure may take several

minutes to complete.

7. Verify that the Status changes to Compensated after the procedure is complete. If the Calibration Status field indicates anything other than Compensated, see Signal Path Compensation Status for information on the readout and recommended action.

NOTE. When making measurements at vertical scale settings less than or equal to 5 mV, you should perform the signal path compensation at least once a week. Failure to do so may result in the instrument not meeting warranted performance levels at those volts/div settings.

Deskew

54 TekExpress® Ethernet NBASE-T Printable Application Help

If skew is present between positive and negative channels, then the channels need to be deskewed before being used for waveform measurements. TekExpress Ethernet NBASE-T provides support for channel deskew using the following method:

1. Determine what the skew is for each channel.

2. From the TekScope menu, select Vertical > Deskew.

3. In the Deskew/Attenuation window, click the channel (1 – 4) button for the

first channel to be deskewed.

4. Click in the Ch(x) Deskew Time entry field and enter the skew. The skew can be +ve or –ve.

5. Click the channel button for the next channel and repeat step 4.

6. After entering the skew for all the channels that require it, from the Options

menu in TekExpress Ethernet NBASE-T, select Deskew.

7. In the Deskew dialog box, select the desired level:

■

Less than 100 mV signal amplitude: Select this if the signal amplitude is such that the oscilloscope’s vertical setting is less than 100 mV/division.

■

100 mV or greater signal amplitude: Select this if the signal amplitude is such that the oscilloscope’s vertical setting is greater than 100 mV/ division.

Running tests

Signal path compensation

for transmitter non-linear

distortion with disturbing

signals

Figure 13: Deskew

8. Click Read Deskew/Attn.

9. When the status in the dialog box indicates the deskew is finished, click

Close.

Each input channel has its own deskew settings. Deskew compensates individual channels for probes or cables of different lengths. The instrument applies the delay values after each completed acquisition. The deskew values are saved as part of the instrument setup. The deskew values for the selected channel are retained until you change the probe, you restore a saved setup, or you recall the factory setup.

Use the following procedure to compensate the signal path for transmitter nonlinear distortion measurement with disturbing signals:

1. Select With disturbing signals (45 MHz) in the Acquire panel of the measurement.

2. Add disturbing signal (Sine wave of 45 MHz) using a Tektronix recommended AWG, AFG, or third party signal generator.

3. Use Combiners to combine the disturbing signal and device test mode signal. If the generator has less outputs, then use splitters in the signal path between generator and combiner.

4. Combiner Effect: Enter the loss occurred values due to combiners. Use the datasheet of the combiners for the values.

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Running tests

5. Compensation Value: Click Auto Compensate to automatically calculate the value. You can also manually enter the values in the input field.

6. Enter the Combiner Effect and Compensation Value in such a way that the disturber amplitude is 7 dB less compared to the amplitude linearity tones.

NOTE. The circuit used to calculate auto compensation only should be used to calculate the measurements.

Running tests

Select tests, set acquisition parameters, set configuration parameters, set preferences parameters, and click Start to run the tests. While tests are running,

you cannot access the Setup or Reports panels. To monitor the test progress, switch between the Status panel and the Results panel.

While the tests are running, other applications may display windows in the background. The TekScope application takes precedence over other applications, but you can switch to other applications by using Alt + Tab key combination. To keep the TekExpress Ethernet NBASE-T application on top, select Keep On Top from the TekExpress Options menu.

Prerun checklist

The application displays report when the tests execution is complete.

1. Make sure that the instruments are warmed up (approximately 20 minutes) and stabilized.

2. Perform compensation: In the oscilloscope main menu, select Utilities > Instrument Compensation. Click Help in the compensation window for

steps to perform instrument compensation.

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Saving and recalling test setup

Test setup files overview

Saved test setup information (such as the selected oscilloscope, general parameters, acquisition parameters, measurement limits, waveforms (if applicable), and other configuration settings) is saved under the setup name at X: \Ethernet NBASE-T.

Use test setups to:

■

Run a new session, acquiring live waveforms, using a saved test configuration.

■

Create a new test setup based on an existing one.

■

View all the information associated with a saved test, including the log file, the history of the test status as it executed, and the results summary.

■

Run a saved test using saved waveforms.

See also

Save a test setup

Open (load) a saved test setup

You can save a test setup before or after running a test. You can create a test setup from already opened test setup, or using default test setup. When you select the default test setup, the parameters are set to the application’s default value.

Select Options > Save Test Setup to save the opened setup.

Select Options > Save Test Setup As to save the setup with different name.

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Saving and recalling test setup

Open (load) a saved test setup

To Open (load) a saved test setup, do the following:

1. Select Options > Open Test Setup.

2. Select the setup from the list and click Open. Setup files are located at X: \Ethernet NBASE-T\.

See also

Create a test setup using an existing one

Create a test setup from default settings

To create a test setup using default settings, follow the steps:

1. Select Options > Default Test Setup. For default test setup, the parameters are set to the application’s default value.

2. Click application Setup and set the parameters

3. Click application Reports and set the report options

4. Optional: Click Start to run the test and verify that it runs correctly and

captures the specified test information and reports. If it does not, then edit the parameters and repeat this step until the test runs to your satisfaction

5. Select Options > Save Test Setup. Enter the file name and click Save. The application saves the file to X:\Ethernet NBASE-T\<session_name>

Create a test setup using an existing one

To create a test setup using an existing one, follow the steps:

1. Select Options > Open Test Setup

2. Select a setup from the list and then click Open

3. Click application Setup and modify the parameters

4. Click application Reports and modify the report options

5. Select Options > Save Test Setup As

6. Enter test setup name, and click Save

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Maximum output droop

This section verifies that the transmitter output level does not drop more than the maximum specified amount.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 6 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential, then provide differential data waveform as input to the measurement.

■

REFLEVEL, MIDLEVEL and HYSTERESIS for edge finding

■

START TIME and STOP TIME

■

POPULATION

■

Number of ACQUISITION AVERAGES

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Measurement procedure

1. If acquisition is single ended, then compute differential waveform (scope

math) using acquired single ended signals.

2. Compute edges of differential signal using midlevel and hysteresis dialed by the user in the user interface.

3. If Droop type is “POSITIVE” then

a. Consider rising edges for further computation. Waveform Edges = rising

edges

Else

a. Consider falling edges for further computation. Waveform Edges =

falling edges

4. For every edge in Waveform Edges,

a. Compute average value of NAVERAGE points around the edge Position

+ start time. This gives High Voltage.

b. Compute average value of NAVERAGE points around the edge Position

+ stop time. This gives Low Voltage.

c. Compute Droop in % = ((High Voltage – Low Voltage)/High Voltage) *

100.

d. Store High Voltage, Low Voltage, Edge Position and Droop in %.

5. Compute Maximum, Minimum, Mean and number of Droops from the

collected result in step 4.

6. Maximum droop in % will be used for comparing with limits given in specification.

Transmitter timing Jitter-Master

This section verifies that the transmitter timing jitter - master of the PMA is within the conformance limits.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 2 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

REFLEVEL, MIDLEVEL and HYSTERESIS for edge finding

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■

Acquisition duration

■

Apply Band Pass Filter – Yes or No

Measurement procedure

1. If Acquisition is SINGLE_ENDED then

a. If APPLY FILTER is YES then, APPLY the band pass filter with Fc as

(200 MHz/S) with band width as 20 KHz on single ended signals.

b. Compute Differential signal (scope math) using acquired single ended

signals

Else

a. If APPLY FILTER is YES then, APPLY the band pass filter with Fc as

(200 MHz/S) with band width as 20 KHz on differential signal.

b. Acquire Differential signal

2. Compute edges of differential signal using midlevel and hysteresis dialed by

the user in the user interface.

3. Determine the direction of first edge

a. If first edge direction is rise, then consider only the rising edges for

further computation. Waveform Edges = rising edges

b. If first edge direction is rise, then consider only the falling edges for

further computation. Waveform Edges = falling edges

4. Do a least square fit using Waveform Edges. X being edge number and Y being edge position.

Compute slope and intercept. Intercept gives starting edge position. Slope gives ideal duration between Waveform Edges.

Using Slope and Intercept, reconstruct the ideal position of Waveform Edges.

5. For every Waveform Edge, Compute TIE.

TIE = Actual position of Waveform Edges – Ideal position of Waveform Edges

6. Compute RMS of TIE.

7. RMS of TIE will be used for comparing with limits given in specification

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Transmitter timing Jitter-Slave

This section verifies that the transmitter timming jitter slave of the PMA is within the conformance limits.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

Configure the jitter slave master DUT in mode 1 and jitter slave slave in mode 3.

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

REFLEVEL, MIDLEVEL and HYSTERESIS for edge finding

■

Acquisition duration

■

Apply Band Pass Filter – Yes or No

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Measurement procedure

1. If Acquisition is SINGLE_ENDED then,

a. If APPLY FILTER is YES, then APPLY the band pass filter with Fc as

(200 MHz/S) with band width as 20 KHz on single ended signals.

b. Compute Differential signal(scope math) using acquired single ended

signals

Else

a. If APPLY FILTER is YES then, APPLY the band pass filter with Fc as

(200 MHz/S) with band width as 20 KHz on differential signal.

b. Acquire Differential signal

2. Compute edges of differential signal using midlevel and hysteresis dialed by

the user in the user interface.

3. Determine the direction of first edge.

a. If first edge direction is rise, then consider only rising edges for further

computation. Waveform Edges = rising edges

b. If first edge direction is fall, then consider only falling edges for further

computation. Waveform Edges = falling edges

4. Do a least square fit using Waveform Edges. X being edge number and Y being edge position.

Compute slope and intercept. Intercept gives starting edge position. Slope gives ideal duration between Waveform Edges.

Using Slope and Intercept, reconstruct the ideal position of Waveform Edges.

5. For every Waveform Edge, Compute TIE.

TIE = Actual position of Waveform Edges – Ideal position of Waveform Edges.

6. Compute RMS of TIE.

7. RMS of TIE will be used for comparing with limits given in specification

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Transmitter Power Spectral Density and Power level

This section verifies that the transmitter Power Spectral Density (PSD) and transmit power level are within the conformance limits.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 5 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

START FREQUENCY, RESOLUTION BANDWIDTH, STOP FREQUENCY for configuring SPECTRAL MAGNITUDE MATH function

■

ACQUISITION AVERAGES

■

SMOOTHING AVERAGES – the window size used for smoothing the PSD curve

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Measurement procedure

1. If acquisition is single ended, then compute differential waveform (scope

math) using acquired single ended signals.

2. Compute the mean of the differential signal, the DC component.

3. Remove the DC component from the differential signal.

MATH2 = Differential signal – Mean (Differential Signal).

Mean is computed using scope measurement.

4. Compute the average of spectral magnitude of MATH2

MATH3 = AVG (SpectralMag (MATH2))

SpectralMag settings are as follows:

■

Center Frequency: STOP FREQUENCY/2

■

Frequency Span: STOP FREQUENCY

■

Window Type: GAUSSIAN

■

Vertical Axis Scale: Linear

■

MATH3 averages: ACQUISITION AVERAGES

■

Resolution Bandwidth: RESOLUTION BANDWIDTH

■

Gate position = 0

■

Gate Duration = (2/Resolution Bandwidth in Hz)

Factor of 2 is because of Gaussian window

5. Do a moving average of spectral signal with number of averages equal to SMOOTHING AVERAGES dialed by user in user interface.

6. Compute linear power spectrum of moving averaged signal. Determine the area under the linear power spectrum.

7. Compute the offset/correction value.

Offset/correction value = function (Resolution Bandwidth configured by user, termination resistance of 100 Ohm, dB to dBm conversion factor, constant factor of 1.05)

Offset/correction value = 10*log10 (dB to dBm conversion factor) – 10*log10 (Resolution Bandwidth) – 10*log10 (termination resistance) + constant factor

Offset/correction value = 10*log10 (1000) – 10*log10 (Resolution Bandwidth) – 10*log10 (100) + 1.05

Offset/correction value = 11.05 – 10*log10 (Resolution Bandwidth)

8. Power in dBm = 10*log10(Area under the linear power spectrum) + Offset value

9. Convert power spectrum in linear scale to dB scale.

10. Compute power spectrum in dBm/Hz

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Power Spectrum in dBm/Hz = power spectrum in dB + Offset value

11. Power in dBm is compared with limits given in specification

12. PSD curve is compared with limit curve given in specification

Transmitter clock frequency

This section verifies that the frequency of the transmit clock is within the conformance limits.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 2 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

REFLEVEL, MIDLEVEL and HYSTERESIS for edge finding.

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Measurement procedure

1. If acquisition is single ended, then compute differential waveform (scope

math) using acquired single ended signals.

2. Compute edges of differential signal using midlevel and hysteresis dialed by the user in the user interface.

3. Compute edge to edge duration

4. Determine the mean, maximum and minimum edge to edge duration

5. Determine the mean deviation, maximum deviation and minimum deviation

in terms of ppm from the nominal frequency (edge to edge frequency of test mode 2 signal).

Mean deviation in terms of ppm = ((1/mean edge to edge duration) – Expected edge to edge period)*1e6/Expected edge to edge period

Maximum deviation in terms of ppm = ((1/minimum edge to edge duration) – Expected edge to edge period)*1e6/ Expected edge to edge period

Minimum deviation in terms of ppm = ((1/maximum edge to edge duration) – Expected edge to edge period)*1e6/ Expected edge to edge period

6. Mean deviation in ppm is compared with limits.

Transmitter non-linear distortion

This section verifies that the output of the transmitter conforms to the transmitter linearity requirements.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 4 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

START FREQUENCY, RESOLUTION BANDWIDTH, STOP FREQUENCY for configuring SPECTRAL MAGNITUDE MATH function

■

ACQUISITION AVERAGES

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Measurement procedure (10GBase-T, 5GBase-T, and 2.5GBase-T)

1. If acquisition is single ended, then compute differential waveform (scope

math) using acquired single ended signals.

2. Compute the average of spectral magnitude of differential signal

MATH3 = AVG (SpectralMag (Differential Signal))

SpectralMag settings are as follows:

■

Center Frequency: STOP FREQUENCY/2

■

Frequency Span: STOP FREQUENCY

■

Window Type: GAUSSIAN

■

Vertical Axis Scale: dB

■

MATH3 averages: ACQUISITION AVERAGES

■

Resolution Bandwidth: RESOLUTION BANDWIDTH

■

Gate position = 0

■

Gate Duration = (2/Resolution Bandwidth in Hz)

Factor of 2 is because of Gaussian window

3. Determine the peaks (two) and their corresponding frequencies in the spectrum.

4. Check whether peaks correspond to the tone pair (based on the sub-test selected). If not then exit the test.

5. Intermodulation frequencies for above found peak frequencies and their corresponding amplitudes up to 20th order are found using the spectrum

6. Determine the intermodulation distortion.

Intermodulation distortion = Sum (Amplitudes of IMF for above found peak frequencies up to 5th order) / Sum (Amplitudes of peak frequencies)

Intermodulation distortion in % = Intermodulation distortion * 100

7. Spurious Frequency Dynamic Range (SFDR) = Minimum (Amplitudes of peak frequencies) – Maximum (Amplitudes of IMF).

8. SFDR is compared with limits given in specification.

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Transmitter non-linear distortion (with disturbing signals)

This section verifies that the output of the transmitter conforms to the transmitter linearity requirements.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Inputs

■

DUT shall be configured to transmit test mode 4 waveform

■

If acquisition is single ended, then provide Data+ and Data- waveforms. If acquisition is differential then provide differential data waveform as input to measurement.

■

START FREQUENCY, RESOLUTION BANDWIDTH, STOP FREQUENCY for configuring SPECTRAL MAGNITUDE MATH function

■

ACQUISITION AVERAGES

Prerequisite

Compensate signal path for transmitter non-linear distortion with disturbing signals

NOTE. The circuit used to calculate auto compensation only should be used to calculate the measurements.

Measurement procedure (2.5GBase-T - with disturbing signals)

Figure 14: Transmitter Test fixture 4 for linearity measurement of 2.5GBaseT with Sine wave injection

1. If acquisition is single ended, then compute differential waveform (scope math) using acquired single ended signals.

2. For each pair of transmitter fixtures, inject 45 MHz signal having amplitude of 7 db below the peak of the transmitter at the MDI.

3. Feed the 45 MHz signal along with differential input signal as separate inputs to a Power splitter and take the mixed signal as output.

4. Compute the average of spectral magnitude of differential signal

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MATH3 = AVG (SpectralMag (Differential Signal))

SpectralMag settings are as follows:

■

Center Frequency: STOP FREQUENCY/2

■

Frequency Span: STOP FREQUENCY

■

Window Type: GAUSSIAN

■

Vertical Axis Scale: dB

■

MATH3 averages: ACQUISITION AVERAGES

■

Resolution Bandwidth: RESOLUTION BANDWIDTH

■

Gate position = 0

■

Gate Duration = (2/Resolution Bandwidth in Hz)

Factor of 2 is because of Gaussian window

■

Determine the peaks (two) and their corresponding frequencies in the spectrum.

5. Determine the peaks (two) and their corresponding frequencies in the spectrum.

6. Check whether peaks correspond to the tone pair (based on the sub-test selected). If not then exit the test.

7. Intermodulation frequencies for above found peak frequencies and their corresponding amplitudes up to 20th order are found using the spectrum

8. Determine the intermodulation distortion.

Intermodulation distortion = Sum (Amplitudes of IMF for above found peak frequencies up to 5th order) / Sum (Amplitudes of peak frequencies)

Intermodulation distortion in % = Intermodulation distortion * 100

9. Spurious Frequency Dynamic Range (SFDR) = Minimum (Amplitudes of peak frequencies) – Maximum (Amplitudes of IMF).

10. SFDR is compared with limits given in specification.

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MDI return loss

This section verifies that the return loss of the DUT is within conformable limits.

Required test equipment

Minimum system requirements

Supported Probes

Equipment connection diagram

Return loss is a measure of the signal power that is reflected due to the impedance mismatch.

Return loss = 20*log10 (Reflected / Incident)

Return loss describes the degree of mismatch between a load and characteristic impedance of a transmission system.

Return loss measurement setup involves fixture, AWG, AWG signal, probes, DUT and oscilloscope. Return loss measurement can be divided into 3 steps

■

Return Loss calibration

■

Computation of error coefficients

■

Computation of return loss

1. Return Loss Calibration

Inputs

■

Wide band calibration signal transmitted from AWG.

■

Let RJ45 patch chord be connected to open impedance.

■

Waveform acquired using a probe connected to input of reference impedance – waveform1

■

Waveform acquired using a probe connected to input of DUT cable under test – waveform2

■

ACQUISITION AVERAGES → Used for averaging acquired time domain signal

■

SMOOTHING AVERAGES → Used internally by C# module for smoothing the return loss curve

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Calibration procedure

a. Incident Signal = Waveform2 + (Waveform1 – Waveform2) =

Waveform1

b. Reflected Signal = Waveform2 – (Waveform1 – Waveform2) =

2*Waveform2 – Waveform1

c. Compute FFT of incident signal and FFT reflected signal

Real Part of FFT of Incident Signal = (SpectralReal (Waveform1))

Imaginary Part of FFT of Incident Signal = (SpectralImag (Waveform1))

Real Part of FFT of Reflected Signal = (SpectralReal (2*Waveform2 – Waveform1))

Imaginary Part of FFT of Reflected Signal = (SpectralImag (2*Waveform2 – Waveform1))

d. Compute Gamma (return loss without error correction) as complex

division of reflected signal by incident signal

Gamma = Complex (Real Part of FFT of Reflected Signal, Imaginary Part of FFT of Reflected Signal) / Complex (Real Part of FFT of Incident Signal, Imaginary Part of FFT of Incident Signal)

e. Repeat steps 1.a to 1.d with waveform1 and waveform2 captured using

short and load impedance (100 Ohm).

2. Computation of Error Coefficients

Inputs

a. Gamma (Complex) values computed with different loads – open, short

and load (Γm1, Γm2, Γm3)

Procedure/Steps:

a. Compute error coefficients a, b and c using Γm1, Γm2 and Γm3 values

3. Computation of Return Loss

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Inputs

a. Wide band calibration signal transmitted from AWG.

b. Let RJ45 patch chord be connected to DUT.

c. Waveform acquired using a probe connected to input of reference

impedance – waveform1

d. Waveform acquired using a probe connected to input of DUT cable under

test – waveform2

e. Error coefficients a, b and c

f. ACQUISITION AVERAGES → Used for averaging acquired time

domain signal

g. SMOOTHING AVERAGES → Used internally by C# module for

smoothing the return loss curve

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Procedure/Steps:

a. Incident Signal = Waveform2 + (Waveform1 – Waveform2) =

Waveform1

b. Reflected Signal = Waveform2 – (Waveform1 – Waveform2) =

2*Waveform2 – Waveform1

c. Compute FFT of incident signal and FFT reflected signal

Real Part of FFT of Incident Signal = (SpectralReal (Waveform1))

Imaginary Part of FFT of Incident Signal = (SpectralImag (Waveform1))

Real Part of FFT of Reflected Signal = (SpectralReal (2*Waveform2 – Waveform1))

Imaginary Part of FFT of Reflected Signal = (SpectralImag (2*Waveform2 – Waveform1))

d. Compute Gamma (return loss/reflection coefficient without error

correction) as complex division of reflected signal by incident signal (Γm)

Gamma = Complex (Real Part of FFT of Reflected Signal, Imaginary Part of FFT of Reflected Signal) / Complex (Real Part of FFT of Incident Signal, Imaginary Part of FFT of Incident Signal)

e. Compute error corrected reflection coefficient

f. Compute return loss in dB scale as Return Loss = 20*log10 (Absolute

(ΓA))

g. Re-normalize the return loss to 85 Ohm and 115 Ohm.

ZA → 100 Ohm

Z1 → 85 Ohm or 115 Ohm

ΓA → Reflection coefficient with 100 Ohm impedance

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TekExpress Ethernet NBASE-T measurements

Return Loss at Z1 Ohm = 20*log10 (Absolute (Gamma at Z1 Ohm))

h. Return Loss curve is compared with limits given in specification.

TekExpress® Ethernet NBASE-T Printable Application Help 75

TekExpress Ethernet NBASE-T measurements

76 TekExpress® Ethernet NBASE-T Printable Application Help

SCPI commands

About SCPI command

You can use Standard Commands for Programmable Instruments (SCPI) to communicate with the TekExpress application.

Socket configuration for SCPI commands

This section describes the steps for TCPIP socket configuration and TekVISA configuration to execute the SCPI commands.

TCPIP socket configuration

1. Click Start > Control Panel > System and Security > Windows Firewall > Advanced settings.

TekExpress® Ethernet NBASE-T Printable Application Help 77

SCPI commands

2. In Windows Firewall with Advanced Security menu, select Windows Firewall with Advanced Security on Local Computer > Inbound Rules

and click New Rule…

3. In New Inbound Rule Wizard menu a. Select Port and click Next.

78 TekExpress® Ethernet NBASE-T Printable Application Help

b. Select TCP as rule apply and enter 5000 for Specific local ports and

click Next.

SCPI commands

c. Select Allow the connection and click Next.

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SCPI commands

d. Select Domain, Private, Public and click Next.

e. Enter Name, Description (optional), and click Finish.

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SCPI commands

4. Check whether the Rule name is displayed in Windows Firewall with Advanced Security menu > Inbound Rules.

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SCPI commands

TekVISA configuration

1. Click Start > All Programs > TekVISA > OpenChoice Instrument Manager.

82 TekExpress® Ethernet NBASE-T Printable Application Help

SCPI commands

2. Click Search Criteria. In Search Criteria menu, click LAN to Turn-on. Select Socket from the drop-down list, enter the IP address of the

TekExpress device in Hostname and type Port as 5000. Click configure the IP address with Port.

Enter the Hostname as 127.0.0.1 if the TekVISA and TekExpress application are in the same system, else enter the IP address of the TekExpress application system.

TekExpress® Ethernet NBASE-T Printable Application Help 83

SCPI commands

3. Click Search to setup the TCPIP connection with the host. Check whether the TCPIP host name is displayed in OpenChoice Instrument Manager >

Instruments.

4. Double-click OpenChoice Talker Listener and enter the Command *IDN?

in command entry field and click Query. Check that the Operation is successful and Talker Listener Readout displays the Command / Data.

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SCPI commands

TEKEXP:*IDN?

This command queries the active TekExpress application name running on the oscilloscope.

Outputs

TEKEXP:*OPC?

Syntax

Inputs

Syntax

Inputs

TEKEXP:*IDN?\n

Returns active TekExpress application name running on the oscilloscope.

TIP. Click here for examples.

This command queries the execution status of the last executed command.

TEKEXP:*OPC?\n

Outputs

TekExpress® Ethernet NBASE-T Printable Application Help 85

0 - last command execution is not complete

1 - last command execution is complete

TIP. Click here for examples.

SCPI commands

TEKEXP:ACQUIRE_MODE

This command sets the acquire mode as live or pre-recorded.

Syntax

Inputs

Outputs

TEKEXP:ACQUIRE_MODE {LIVE | PRE-RECORDED}\n

{LIVE | PRE-RECORDED}

TIP. Click here for examples.

TEKEXP:ACQUIRE_MODE?

This command queries the acquire mode type.

Syntax

Inputs

TEKEXP:ACQUIRE_MODE?\n

Outputs

{LIVE | PRE-RECORDED}

TIP. Click here for examples.

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SCPI commands

TEKEXP:EXPORT

This command returns all the bytes of data to the specified file.

Syntax Outputs

TEKEXP:EXPORT REPORT\n Returns the report file in bytes

TEKEXP:EXPORT WFM,"<FileName>"\n Returns the specified waveform file in bytes

TEKEXP:EXPORT IMAGE,"<FileName>"\n Returns the specified image file in bytes

TEKEXP:INFO?

Inputs

FileName - Specifies the file name

TIP. Click here for examples.

This command queries the information about the file(s).

Syntax Outputs

TEKEXP:INFO? REPORT\n <ReportFileSize>,"<ReportFileName.mht>"

TEKEXP:INFO? WFM\n <WfmFile1Size>,"<WfmFileName1.wfm>";<Wfm

File2Size>,"<WfmFileName2.wfm>";...

TEKEXP:INFO? IMAGE\n <Image1FileSize>,"<Image1FileName>";<Image

2FileSize>,"<Image2FileName>" ;...

TIP. Click here for examples.

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SCPI commands

TEKEXP:INSTRUMENT

This command sets the value for the selected instrument type.

Syntax

Inputs

Outputs

TEKEXP:INSTRUMENT?

TEKEXP:INSTRUMENT "<InstrumentType>",<Value>"\n

InstrumentType

Value

TIP. Check Command parameters list for InstrumentType and Value parameters.

TIP. Click here for examples.

This command queries the instrument selected for the specified instrument type.

Syntax

Inputs

TEKEXP:INSTRUMENT? "<InstrumentType>"\n

InstrumentType

TIP. Check Command parameters list for InstrumentType parameters.

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SCPI commands

Outputs

TEKEXP:LASTERROR?

Syntax

Inputs

Outputs

Returns the instrument selected for the specified instrument type

TIP. Click here for examples.

This command queries the last error string occurred for the current TCP session. If there are no errors since startup, or since the last call to TEKEXP:LASTERROR?\n, this command returns an empty string.

TEKEXP:LASTERROR?\n

TEKEXP:LIST?

TIP. Click here for examples.

This command queries the list of available device, suite, test, version or instrument.

Syntax Outputs

TEKEXP:LIST? DEVICE\n Returns the list of available device(s) as comma

separated values.

TEKEXP:LIST? SUITE\n Returns the list of available suite(s) as comma

separated values.

TEKEXP:LIST? TEST\n Returns the list of available test(s) as comma

separated values.

TEKEXP:LIST? VERSION\n Returns the list of available version(s) as comma

separated values.

TEKEXP:LIST? INSTRUMENT,"<InstrumentType>"\n

Returns the list of available instruments' for the given Instrument type as comma separated values.

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SCPI commands

NOTE. This command returns the list of items within double quotes (""). Iterate the receive procedure until the list ends with double quotes otherwise the next query commands won’t work as expected.

TEKEXP:MODE

Inputs

Syntax

Inputs

Outputs

InstrumentType

TIP. Check Command parameters list for InstrumentType parameters.

TIP. Click here for examples.

This command sets the execution mode as compliance or user defined.

TEKEXP:MODE {COMPLIANCE | USER-DEFINED}\n

{COMPLIANCE | USER-DEFINED}

TIP. Click here for examples.

90 TekExpress® Ethernet NBASE-T Printable Application Help

Tektronix TekExpress Ethernet NBASE-T Compliance Solution Help Online Help

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Welcome

Getting help and support

Related documentation

Conventions

Technical support

Getting started

Minimum system requirements

Instruments and accessories required

Supported Probes and Power splitter

Installing the software

View software version

Application directories

File name extensions

Operating basics

Launch the application

Application panels overview

Application controls

Global application controls

Options menu overview

Configure email settings

Setup panel

Setup panel overview

Set DUT parameters

Select tests

See also. Set acquisition tab parameters

Status panel overview

Results panel

Results panel overview

View test-related files

Plots panel

Plots panel overview

Reports panel

Reports panel overview

Select report options

View a report

Report contents

Running tests

Equipment connection setup

Return Loss Calibration

Return Loss Setup

Prerequisite

Deskew

Running tests

Saving and recalling test setup

Test setup files overview

Save a test setup

Open (load) a saved test setup

Create a test setup using an existing one

Create a test setup from default settings

TekExpress Ethernet NBASE-T measurements

Maximum output droop

Transmitter timing Jitter-Master

Transmitter timing Jitter-Slave

Transmitter Power Spectral Density and Power level

Transmitter clock frequency

Transmitter non-linear distortion

Transmitter non-linear distortion (with disturbing signals)

MDI return loss

SCPI commands

About SCPI command

Socket configuration for SCPI commands

TEKEXP:*IDN?

TEKEXP:*OPC?

TEKEXP:ACQUIRE_MODE

TEKEXP:ACQUIRE_MODE?

TEKEXP:EXPORT

TEKEXP:INFO?

TEKEXP:INSTRUMENT

TEKEXP:INSTRUMENT?

TEKEXP:LASTERROR?

TEKEXP:LIST?

TEKEXP:MODE