Tektronix 400G-M4 Help Primary User

400G-M4

ZZZ

Application Help

Printable Application Help

*P077147103*

077-1471-03

400G-M4 Application Help

ZZZ

Printable Application Help

w.tek.com

077-1471-03

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.

This document supports 400G-M4 software version 1.1.X and greater, for use with the DSA8300 oscilloscope.

Application help system part number: 076-0423-03

Printable version of the application Help (PDF): 077-1471-03

Contacting Tektronix

Tekt ron 14150 SW Karl Braun Drive P.O . B o x 5 0 0 Beaverton, OR 97077 USA

For pr

ix, Inc.

oduct information, sales, service, and technical support: In North America, call 1-800-833-9200. Worldwide, visit www.tek.com to ﬁnd contacts in your area.

Table of Contents

Introduction

Welcome............................................................................................................. 1

Computer requirements............................................................................................ 2

DSA8300 sampling oscilloscope requirements ................................................................. 2

TekVISA software.................................................................................................. 3

Option key........................................................................................................... 3

Documentation...................................................................................................... 3

Display elements

Elements of the display............................................................................................ 5

Menu bar operations

File menu............................................................................................................ 7

Scope menu ......................................................................................................... 7

Plot menu............................................................................................................ 9

Help menu........................................................................................................... 9

Table of Contents

Horizontal Settings

Horizontal settings................................................................................................. 11

Measurement selections

Measurement selections........................................................................................... 13

Measurement conﬁguration

TDECQ conﬁguration........................................................................................ 13

Mode selection

Mode selection..................................................................................................... 17

Bandwidth enhancement

Bandwidth enhancement(BWE)................................................................................. 19

Set Scope

Set Scope button ................................................................................................... 21

Clear button

Clear button ........................................................................................................ 23

400G-M4 Printable Application Help i

Table of Contents

Single

Single button....................................................................................................... 25

Run button

Run button.......................................................................................................... 27

Ofﬂine mode

Ofﬂine mode ....................................................................................................... 29

Online mode

Onlinemode........................................................................................................ 31

Results

Results elements................................................................................................... 33

Symbol l

Eye results.......................................................................................................... 34

TDECQ and PAM4 results ....................................................................................... 35

evel measurement....................................................................................... 34

Oscilloscope connection tips

Check network access............................................................................................. 37

ISA setup and troubleshooting............................................................................. 37

TekV

Firewall exceptions................................................................................................ 39

Remote control

Remotecontrol introduction...................................................................................... 41

Handshaking protocol............................................................................................. 41

tting up the PI environment.................................................................................... 42

Se Variable:Value Commands

Syntax.......................................................................................................... 43

Variable name arguments and queries...................................................................... 44

Programming examples

Perl program example: conﬁgure and operate 400G-M4 ................................................ 59

Python example ............................................................................................... 61

Feedback

Feedback............................................................................................................ 63

Index

ii 400G-M4 Printable Application Help

Introduction Welcom e

Welcome

The 400G-M4 analysis application provides PAM4 signaling analysis, including TDECQ (Transmitter and Dispersion Eye Closure Quaternary) measurement. The application brings together PAM4 optical measurement

TheapplicationisintendedtobeinstalledonaPCandcanoperateineitherofﬂine or online mode.

Ofﬂine mode: allows you to analyze a waveform ﬁle saved from the 80SJNB application (running on the DSA8300 Digital Sampling Oscilloscope) or a waveform ﬁle saved from the 400G-M4 application acquired f

Online mode: allows you to acquire directly from a connected DSA8300 Digital Sampling Oscillos

NOTE. Online mode requires the installation of an option key on the target DSA8300 Digital Sampling Oscilloscope to enable establishing a connection from the 400G-M4 application. Refer to the documentation provided with the DSA8300 for instructions to add a new option key.

s in a simple and easy to use application.

rom a connected DSA8300 sampling oscilloscope.

cope and analyze acquired waveform data.

Key features

The 400G-M4 application performs comprehensive analysis of PAM4 signals, including TDECQ measurements and other optical measurements.

400G-M4 provides the following features:

Show results as numeric and graphical display

Perform TDECQ (Transmitter and Dispersion Eye Closure Quaternary)

PAM4 signal characterization measurement such as level and eye measurements

ndard IEEE TDECQ Measurements (802.3bs, Section 121.8.5 and 802.3cd)

Sta

Acquire complete pattern waveform with user deﬁned Samples/UI

Display 2-D eye diagrams

Save acquisition results to a data ﬁle

See also:

TekVISA software (see page 3)

DSA8300 sampling oscilloscope requirements

The 400G-M4 application requires the following software to be installed on the connected DSA8300 sampling oscilloscope.

Scope Noise Characteristics: This application is provided with the 400G-M4 installation. It is a separate installation ﬁle (bundled with the 400G-M4 download package) that is to be installed on the connected DSA8300. This application enables the 400G-M4 application to automatically obtain the scope noise value of the DSA8300.

The option key for the 400G-M4 application must be installed on the DSA8300 to which the application connects for online mode of operation.

2 400G-M4 Printable Application Help

Introduction TekVISA software

TekVISA software

TekVISA is preinstalled on the DSA8300 sampling oscilloscopes, but to use this protocol to connect and communicate with a DSA8300 sampling oscilloscope, TekVISA must also be installed on the PC (where the 40

TekVISA is available with the 400G-M4 application installation ﬁle or can be downloaded for free from the Tektron

0G-M4 application resides).

ix website (www.tek.com

). Search for TekVISA Connectivity software.

Option key

To enable the 400G-M4 application to connect directly to a DSA8300 Digital Sampling Oscilloscope (online m

Contact Tektronix to purchase a 400G-M4 option key.

Refer to the DSA8300 application help system for instructions to install option keys.

ode), the target DSA8300 must have a 400G-M4 option key installed.

Documentation

The application help system is available from the Help menu.

In addition to the help system, a printable version of the Help is provided as a PDF in the following folder:

C:\Users\Public\Tektronix\TekApplications\400G-M4.

400G-M4 Printable Application Help 3

Introduction Documentation

4 400G-M4 Printable Application Help

Display elements Elements of the display

Elements of the display

400G-M4 Printable Application Help 5

Display elements Elements of the display

6 400G-M4 Printable Application Help

Menu bar operations File menu

File menu

The ﬁle menu provides the following operations:

Table 1: File menu

Setting Description

Save Waveform Saving waveforms is only available when using the online mode.

You can save the acquired waveform (or waveforms if multiple channels are enabled) from the connected DSA8300 oscilloscope. A dialog screen opens to allow you to navigate to name and save the waveform.

Use the dialog screen to provide a base ﬁlename. The ﬁlename will be appended with the channel source of the w aveform.

Save Setup Use the dialog screen to navigate to a location to save the setup ﬁle to recall at a later time. Setup

ﬁles use a ﬁle extension of .gm4. Setup ﬁles contains the following information:

■ Horizontal settings

■ Measurement selections

■ All measurement conﬁguration settings

■ Ofﬂine setting

■ FFE tap values

■ Measurement results

■ BWE settings

Setup ﬁles do not save information relating to the oscilloscope or modules, such as:

■ Scope IP address

■ Scope Noise

■ Vertical setting

■ Channels enabled

■ Module related information

■ External attenuation

Recall Setup Use the dialog screen to navigate to a saved setup ﬁle to restore the application to a known setup. Exit Exits the application.

xxx

NOTE. The File menu operations are unavailable if a n analysis is currently running.

Scope menu

Selecting Scope opens the TDECQ Connect To Scope dialog screen.

400G-M4 Printable Application Help 7

Menu bar operations Scope menu

Enter the IP address or the computer name of the oscilloscope you want to connect to. The IP address can be found by viewing the Windows network connection status. The computer name can be found in the System properties.

Connect. Select the Connect button to make the connection. (The Connect button changes to Disconnect

if a conn

The Status area at the bottom of the main screen also indicates a successful connection.

ection is established.)

AutoSync to Selected Sources. During the connection process, the 400G-M4 application detects the

modules installed in the oscilloscope along with their characteristics (such as the module type, serial number, ﬁlters or bandwidth). If you change a module or change a module’s characteristics, use the AutoSync to Selected Sources button to easily update the 400G-M4 application without having to reconnect.

If you are having difﬁculty connecting to your oscilloscope, see the section Connection help and tips

(see page 37).

E. The 400G-M4 application can only connect to one DSA8300 Digital Sampling Oscilloscope at a

NOT

time.

8 400G-M4 Printable Application Help

Menu bar operations Plot menu

Plot menu

The Plot menu allows you to open the TDECQ eye plot display in Matlab.

Help menu

In addition to accessing the application help system, use the help button to obtain the application software version number.

This can help when contacting Tektronix about the application and to check if there are newer versions available from the Tektronix website (www.tek.com

A printable version of the help system is provided as a PDF in the following folder:

\Program Files\TekApplications\400G-M4.

400G-M4 Printable Application Help 9

Menu bar operations Help menu

10 400G-M4 Printable Application Help

Horizontal Settings Horizontal settings

Horizontal settings

The horizontal settings are only applicable when using the online mode (connected to an oscilloscope). The settings are global for all online channels. In ofﬂine mode, these settings are automatically extracted from the wave

Set the values as appropriate for the type of optical signal you are analyzing.

Table 2: Horizontal settings

Setting Description

Baud Rate Pattern Length Wfm Samples/UI Enter the number of waveform samples per user interval. Avg

form ﬁle.

Enter the GigaBaud rate of the signal you intend to acquire. Enter the Pattern Length of the signal you intend to acquire.

When enabled, enter the # of Wfms of to acquire. The acquired waveforms are then averaged together into a single waveform.

Use the File –> Save Waveform to save the averaged waveform.

#ofWfms

(Only available for live channels)

xxx

NOTE. When Averaging waveforms, no measurements are performed.

With the Avg box enabled, enter the number of waveforms to average from the acquisition (not available for TDECQ measurements).

Range: 1 to 1000.

400G-M4 Printable Application Help 11

Horizontal Settings Horizontal settings

12 400G-M4 Printable Application Help

Measurement selections Measurement selections

Measurement selections

The measurement selection includes all the available optical measurements.

The selected measurements apply to the ofﬂine mode (ﬁle analysis) and to the online mode for all channels.

Table 3: Measurement selections

Measurements Description

TDECQ Includes the following measurements to the results section.

■ TDECQ: Transmitter and dispersion eye closure for PAM4 deﬁned by IEEE 802.3bs (draft 3.5, dated 10-October-2017).

■ OMAouter: The outer Optical Modulation Amplitude.

■ ER: The extinction ratio of the highest and lowest optical power levels of a PAM4 optical signal.

■ AOP: The average optical power of a PAM4 optical signal.

Eye

Symbol Level Includes all the Symbol level measurement results.

Laser Tuning Mode

xxx

Includes the following measurements to the results section.

■ RLM: Level separation mismatch ratio.

■ Level Deviation: The average deviation of level spacing from the ideal spacing.

■ Level Thickness: The averaged, normalized level standard deviation at minimum inter-symbol

interference.

■ The Threshold/Offset/Horizontal Eye (H_eye)/Vertical Eye (V_eye) for each PAM4 eye.

■ Symbol Levels: Provides the Mean, Standard Deviation, and Pk-Pk values of the V_D(3), V_C(2),

V_B(1), V_A (0) s ymbol levels. Laser Tuning Mode changes the operation of the application to enable you to quickly adjust your

laser settings while acquiring data. When enabled, two changes to operation take effect:

■ Pressing the Run button starts a continuous analysis cycle. To run a single analysis, you must use the Single button.

■ Some measurements such as symbol levels and RLM run much faster (but with slightly less accuracy).

ECQ c on ﬁguration

e measurement conﬁguration allows you to further deﬁne the TDECQ measurement and adjust the

Th Extinction Ratio results.

400G-M4 Printable Application Help 13

Measurement selections TDECQ conﬁguration

Table 4: Measurement conﬁguration

TDEQ Con ﬁguration

FFE taps FFE Taps/UI Enter the number of taps per unit interval (symbol) for FFE. The range of the value is 1 – 10. Max Pre-Cursors Enter the maximum number of pre-cursor taps for FFE. The value must be less than the number of

nded Search

Exte

Vertical Threshold

ust

Adj

toset Tap Values

Enter the number of taps. The number of taps must be an odd value.

ps.

FFE ta

is disabled by default.

This When enabled, the algorithms perform an extended search for the optimal FFE taps to minimize the

TDECQ value (but increases the time to complete).

disabled, the FFE taps are adapted faster but may be less optimal.

When

s is enabled by default.

Thi When enabled, the sub-eye threshold levels are allowed to adjust by ± 1% of the OMAouter. IEEE

802.3cd allows this option to be selected for TDECQ measurements. en disabled, the sub-eye threshold levels are determined by OMAouter and the average optical

Wh power.

When enabled, the application automatically calculates optimized FFE taps to minimize the TDECQ value.

hen disabled, the current FFE taps are used. You can manually input the FFE tap values via the

W FFE Tap Values area at the bottom of the application main screen.

This is enabled by default.

14 400G-M4 Printable Application Help

Measurement selections TDECQ conﬁguration

Table 4: Measurement conﬁguration (cont.)

TDEQ Conﬁguration

Auto Import Scope Noise

Recalculate Taps

ER Adjust

Off Line Ch1 – Ch4

xxx

This is enabled by default. When enabled, the application automatically retrieves the measured oscilloscope noise from the

connected DSA8300 oscilloscope when in online mode. The Scope Noise Characteristics application must be i nstalled and run prior to importing the

oscilloscope noise. This is disabled by default. When enabled, the application recalculates taps at every run when Autoset Tap Values is On. This

uses the FFE tap seed from the previous calculation or recalculates a new one. You can save the measurement time by using the FFE tap seed from the previous calculation.

ER Adjust allows you to add or subtract a speciﬁed percentage from the measured extinction ratio value, adjusting for a better m atch between multiple oscilloscopes.

This can be set individually for Off Line mode and each individual channel when in online mode.

400G-M4 Printable Application Help 15

Measurement selections TDECQ conﬁguration

16 400G-M4 Printable Application Help

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Tektronix 400G-M4 Help Primary User

Specifications and Main Features

Frequently Asked Questions

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