1000BASE-T1/100BASE-T1 (Opt. 6-CMAUTOEN/5-CMAUTOEN) Datasheet

Automotive Ethernet Test Solution



Key Features

  • Test Time: Fully automated with setup wizard, to perform compliance testing as per the Automotive Ethernet 1000BASE-T1TM (802.3bp) and IEEE P802.3bwTM (100BASE-T1) standards.
  • Validation and Debug: Supporting tools, such as advanced jitter analysis, help to catch problems before compliance testing, or in the event of a failure.
  • Signal Qualification: In addition to compliance testing, automated tests and advanced jitter analysis tools are provided for testing your DUT under different environmental conditions.
  • Comprehensive Report: Automated reporting with Pass/Fail screenshot of the waveform.
  • Measurement Accuracy: The 5/6 series MSO oscilloscope provides accurate and repeatable results with a 12-bit vertical resolution at the sampling rate of 6.25 Gs/s (5 series MSO) and 12.5 Gs/s (6 series MSO).
  • Return Loss Measurements: The 100/1000BASE-T1 specification defines Return Loss measurement that requires a Vector Network Analyzer (VNA). A patented measurement approach in the Tektronix Automotive Ethernet Test Solution software allows the designer to perform return loss measurement using an oscilloscope, reducing the need for additional test equipment.
  • Signal Access: Tektronix offers fixtures, a clock divider, and probes for a complete solution.

Automated Automotive Ethernet compliance testing

Physical layer compliance tests have been defined to ensure interoperability between different designs and hardware vendors. These requirements to perform these tests have been expanded and now cover Automotive Ethernet 1000BASE-T1TM(802.3bp) and IEEE P802.3bwTM(100BASE-T1). For electrical signaling, there are specific tests defined for the Physical Media Attachment (PMA), and as part of Group 1, focuses primarily on the transmitter. 1000BASE-T1 Automotive Ethernet testing requires an oscilloscope with a minimum of 2 GHz bandwidth.

Supported tests for 1000BASE-T1
Test Items Test Name Test Mode Instrument  Maximum Output Droop 2 GHz oscilloscope  Transmitter Distortion 2 GHz oscilloscope and AWG  Timing Jitter (Master/Slave) 2 GHz oscilloscope  Power Spectral Density (PSD) 2 GHz oscilloscope  Clock Frequency 2 GHz oscilloscope  Peak Differential Output 2 GHz oscilloscope  MDI Return Loss slave 2 GHz oscilloscope and AWG or Tektronix VNA  MDI Jitter 2 GHz oscilloscope
Supported tests for 100BASE-T1
Test ID Test Name Test Mode Instrument
5.1.1  Maximum Output Droop 1 GHz oscilloscope
5.1.2  Transmitter Distortion 1 GHz oscilloscope and AWG/AFG
5.1.3  Timing Jitter 1 GHz oscilloscope
5.1.4  Power Spectral Density (PSD) 1 GHz oscilloscope
5.1.5  Clock Frequency 1 GHz oscilloscope
5.1.6  MDI Return Loss slave 1 GHz oscilloscope and AWG or Tektronix VNA
5.1.6  Peak Differential Output 1 GHz oscilloscope

The Tektronix Automotive Ethernet test solution provides automated compliance testing for IEEE 802.3bpTM(1000BASE-T1) and IEEE P802.3bwTM(100BASE-T1) requirements. The automated compliance solution includes test software that runs on a 1 GHz or greater Windows 10 OS Tektronix oscilloscope to perform all physical layer (PHY) transmitter compliance tests.

The compliance software allows for complete or selective testing of any of the transmitter electrical specifications, including complete oscilloscope control of the required setups. Software setup flexibility allows you to perform design validation, margin analysis, and repeatable compliance testing while reducing instrument setup difficulties. Additionally, the software can generate a comprehensive date-stamped test report with pass/fail results, and display waveforms and data plots.


The TekExpress Automotive Ethernet setup menu - 1000BASE-T1

The Automotive Ethernet compliance software allows selection of all or any of the specific tests through a simple Setup menu. Software navigation follows a logical workflow for quick test setups, changes, and review of test results.

Test setup configurations vary greatly from connections to the device under test, probing, test fixtures, calibration, and use of the oscilloscope and signal generator. To help testers correctly set up for a measurement, the Automotive Ethernet software provides setup instructions for each test, with images and reference illustrations, to ensure the correct setup.


Setup configuration

The Automotive Ethernet compliance software requires a Tektronix 5/6 Series MSO oscilloscope with Option 5-WIN/6-WIN or SUP5-WIN/SUP6-WIN (Microsoft Windows 10). Since it operates as a Windows application, the software shares the oscilloscope display. For convenience, the recommended configuration is to add a PC display monitor to display the compliance software and test reports separately from the oscilloscope screen.



Displaying the compliance software on a separate monitor for easier results analysis

Conducting each test requires configuring the transmitter for specific operating modes using specialized software from the device supplier. Once the transmitter is correctly configured, along with the proper test fixtures and probing, configure the Automotive Ethernet software setup to match the specific test of interest. After test selection, the software guides you to perform all the necessary instrument setups. For the Distortion and Return Loss tests, this can include setup of the signal generator required to conduct these tests.

Performing the distortion test requires being able to reference the actual PHY reference clock which is used to synch the oscilloscope and the signal generator. Under certain circumstances, it may not be possible to directly access this clock. In these situations, the Automotive Ethernet software provides an option that does software signal correction to ensure accurate results.


TekExpress Automotive Ethernet provides external reference clock input sources - 1000BASE-T1

Industry defined testing

In order to ensure hardware interoperability, the test software follows the test methods and test limits defined by the OPEN (One-Pair-Ethernet) Alliance Special Interest Group (SIG). The OPEN Alliance test suite documents are strictly followed to ensure that the instrument setups, algorithms, and test outcomes are fully supported.

Distortion measurement

Configured for Test Mode as referred in the table Supported tests for 1000BASE-T1/100BASE-T1, the distortion test measures the maximum allowable transmitter distortion. This test requires the use of a disturbing sine wave signal that is added to the PHY output signal. The peak transmitter distortion is calculated, and the measured values are compared against the compliance test specification.


Distortion measurement

Return Loss measurement

The MDI return loss test determines the impedance mismatch from the differential impedance specification of 100 Ω, which will affect hardware interoperability. This test can be performed using a Tektronix VNA, but the Tektronix 5-CMAUTOEN/6-CMAUTOEN solution can perform this test with an oscilloscope using a patented measurement approach that eliminates the need for additional test instruments.

Jitter and Transmit Clock Frequency measurements

The PHY has a symbol clock that is the output using Test Mode as referred in the table Supported tests for 1000BASE-T1/100BASE-T1. Separate tests are run to measure the Master (Slave) RMS jitter and the TX clock frequency.


Jitter and Transmit Clock Frequency measurements

Droop measurement

The PHY is configured using Test Mode as referred in the table Supported tests for 1000BASE-T1/100BASE-T1. The droop measurements are performed by determining the positive and negative waveform peak voltages.


Droop measurement - Positive


Droop measurement - Negative

Power Spectral Density (PSD) measurement

The spectral of an input signal (set to Test Mode as referred in the table Supported tests for 1000BASE-T1/100BASE-T1), is computed using built-in oscilloscope MATH functions. Post processing is done on the signal to arrive at the PSD. The computed PSD is then compared with the specification by using lower and upper masks to arrive at the final result.


Power Spectral Density (PSD) measurement

MDI Jitter measurement

Configure for Test Mode as referred in the table Supported tests for 1000BASE-T1/100BASE-T1, and transmit three {+1} symbols followed by three {-1} symbols continually. Measure jitter of the Data signals.


MDI jitter measurement

Validation and debug

Validation and debugging can easily be accomplished early in the design process and ahead of final compliance testing by using the 5/6 Series MSO oscilloscope. The oscilloscope’s standard measurement set, along with the optional 5-DJA/6-DJA Advanced Jitter and Timing Analysis software, supports several of the key compliance tests including:

  • Clock frequency and transmitter amplitude with histogram and trend analysis
  • Positive and negative droop measurements
  • Full characterization of jitter performance including TIE and histogram profiles
  • Eye diagram analysis of PAM3 signals

This type of early testing increases the likelihood of passing compliance tests, while allowing more complete characterization and determination of design margins. Master and slave jitter measurements can be particularly challenging given the tight compliance limits and the need to eliminate any possible sources of random or deterministic jitter.


Transmitter Master Jitter analysis showing 30.68 ps Time Interval Error (TIE) value using 5/6 Series MSO measurements and option 5-DJA/6-DJA measurements

Susceptibility to various sources of interference is a concern for reliable network communication between master and slave devices. Confirmation of reliable operation and identification of possible sources of interference or error conditions can be difficult to distinguish in PAM3 signaling.

Eye pattern analysis is a proven technique to evaluate long data streams of complex communication signals. Configuring the oscilloscope with the Advanced Jitter and Eye Analysis software (Opt. 5-DJA/6-DJA) provides capabilities to debug and execute measurements of jitter, timing, and eye diagrams completely.


Transmitter Master Jitter analysis showing 30.68 ps Time Interval Error (TIE) value using 5/6 Series MSO measurements and option 5-DJA/6-DJA measurements

Signal Qualification

Automotive designers need to qualify their circuit designs under various conditions such as temperature, voltage, and vibration. Apart from compliance, designers need to qualify the design under various conditions. The 5-DJA/6-DJA Advance Jitter and Timing Analysis software allows designers to configure 1000BASE-T1/100BASE-T1 measurements and run them under different environmental conditions. Designers can integrate the measurement in their automation environment to run the measurement in a continuous mode.


PHY jitter / timing analysis


Differential amplitude profile


Distortion signal eye analysis

Pass/fail reports

Creating compliance test documentation is quick and easy in 5-CMAUTOEN/6-CMAUTOEN with a summary report in MHL or PDF format. The software automatically generates a report after tests are completed, and includes Pass/Fail status to quickly analyze the test results. The report also includes test configuration details, waveform plots, oscilloscope displays, and margin analysis, to provide more insights into your design.


Detailed test report showing PSD mask test plot

6 Series MSO oscilloscope


6 Series MSO oscilloscope

With up to 8 GHz analog bandwidth, 25 GS/s sample rates, lowest noise and highest resolution, the 6 Series MSO oscilloscope has the performance you need to capture waveforms with the best possible signal fidelity and resolution for viewing small waveform details of Automotive Ethernet signals.

The 6 Series MSO oscilloscope provides the performance to capture the signals of interest while minimizing the effects of unwanted noise, when you need to capture high-amplitude signals when viewing the smaller signal details. At the heart of the 6 Series MSO oscilloscope are 12-bit analog-to digital converters (ADCs) that provide 16 times the vertical resolution of traditional 8-bit ADCs.

Probing and test fixtures

Accurate and repeatable compliance testing requires access to the PHY transmitter output and reference clock, and must support calibration and use of disturbing signals. The recommended approach is to use the Tektronix TF-XGbT Ethernet fixture and the TF-BRR-CFD clock divider fixtures. These fixtures can support all test setups while providing convenient test points for probing.


TF-XGbT Ethernet fixture

For direct probing of a DUT, use a differential probe with a bandwidth of ≥2 GHz. The Tektronix TDP3500 is the recommend differential probe for 1000BASE-T1 testing.

Ordering information

Required software

Option 5-CMAUTOEN/6-CMAUTOEN or SUP5-CMAUTOEN/SUP6-CMAUTOEN (TekExpress Automotive Ethernet compliance)

Required hardware

1000BASE-T1 5 Series MSO oscilloscope (2 GHz option 5-BW-2000) or 6 Series MSO oscilloscope with minimum bandwidth of 2 GHz (Option 6-BW-2500, 6-BW-4000, 6-BW-6000, 6-BW-8000)

100BASE-T1 5 Series MSO oscilloscope (1 GHz option 5-BW-1000 or 2 GHz option 5-BW-2000) or 6 Series MSO oscilloscope with minimum bandwidth of 1 GHz (Option 6-BW-1000, 6-BW-2500, 6-BW-4000, 6-BW-6000, 6-BW-8000)

Option 5-WIN/6-WIN or SUP5-WIN/SUP6-WIN (removable SSD with Microsoft Windows 10 operating system)

Recommended options

Option 5-DJA/6-DJA or SUP5-DJA/SUP6-DJA (adds Advanced Jitter and Eye Analysis measurements)

Option 5-RL-125M/6-RL-125M or SUP5-RL-125M/SUP6-RL-125M (adds 125 M record length)

Option 5-SRAUTO/6-SRAUTO or SUP5-SRAUTO/SUP6-SRAUTO (adds CAN, CAN FD, LIN, FlexRay serial bus trigger and decode)

Option 5-SRAUTOSEN/6-SRAUTOSEN or SUP5-SRAUTOSEN/SUP6-SRAUTOSEN for SENT Protocol trigger and decoder

Option 5-SREMBD/6-SREMBD or SUP5-SREMBD/SUP6-SREMBD (adds I2C, SPI serial bus trigger and decode)

Recommended (two required): 1000BASE-T1 TDP3500 differential probes and 100BASE-T1 TDP1500 or TDP3500 differential probes

Supported: P6247 or P6248 (requires use of TPA-BNC adapter)

Signal sources (AWG)

Recommended: Tektronix AFG3152C signal source

Supported: Tektronix AWG5200 with high amplitude DC coupled output option or AWG70000 signal source (for 1000BASE-T1 Return Loss Measurement)

Recommended test fixtures

TF-XGbT Test Fixture

TF-BRR-CFD clock frequency divider

Recommended extras

External PC monitor

Two pairs of 50 Ω high-quality SMA or coaxial cables (four cables total) for use with AFG or AWG signal sources; all cables must be the same length

Two 50 Ω high-quality coaxial cables for use with clock divider outputs; both cables must be the same length

One 50 Ω high-quality SMA cable for the clock divider input

One 50 Ω high-quality coaxial cable for the AFG or AWG signal source, for marker output

Last Modified: 2018-07-26 05:00:00


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