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Testing the MOST150 coax Physical Layer MOST Forum Esslingen, 19.04.2016 Jrg Angstenberger Head of Technology Assessment and Test Laboratory www.ruetz-system-solutions.com experts in automotive data communication Agenda 1. Introduction 2.

  1. Testing the MOST150 coax Physical Layer MOST Forum Esslingen, 19.04.2016 Jörg Angstenberger Head of Technology Assessment and Test Laboratory www.ruetz-system-solutions.com experts in automotive data communication

  2. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 2

  3. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 3

  4. Introduction MOST150 Test - What do we know, what do we need? • Sophisticated test concept for MOST150 optical Physical Layer already exists and will be the base for MOST150 coax Physical Layer (cPHY) • Physical Layer Stress Test Tool (PhLSTT) originally developed for MOST150 oPHY in collaboration with the MOST Cooperation can be reused • Some Elements of the MOST150 oPHY Test Setup have to be replaced to cover electrical/ coax instead of optical properties • These additional Elements are implemented in one single Tool called MOST Cable Tester Model (MTCM) for easy and seamless integration into the existing MOST150 oPHY Setup www.ruetz-system-solutions.com experts in automotive data communication 4

  5. Introduction What is the Basic Test Concept for MOST150 limited PHY Layer? Physical Layer Stress Test Tool - Sets DUT in Retiming Bypass - Generation of Stress Pattern Physical Layer - Bit Error Check of Feedback Signal Stress Test Tool - Read Error Counters from DUT  Feedback SP3 SP2 DUT www.ruetz-system-solutions.com experts in automotive data communication 5

  6. Introduction What has to be replaced to get a MOST150 cPHY Test Setup? Automation SP3: Optical Fiber Model - Optical Attenuator to change optical input power Physical Layer - Fiber Channel to simulate short or Stress Test Tool long fiber connection Oscilloscope  Feedback SP2: Signal Splitter and Converter - Return path for PhLSTT Optical - Converting optical signal for Optical Probe Attenuator Oscilloscope Optical Replaced by an integrated Fiber Channel Splitter Test Solution that supports Low/ High BW cPHY param eters instead of oPHY: SP3 SP2 MOST Cable Tester Model DUT www.ruetz-system-solutions.com experts in automotive data communication 6

  7. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 7

  8. Basic Test Setup Requirements Which features have to be developed for MOST150 cPHY Testing? 1. Emulate a transfer function to represent a coax link on a MOST150 stress pattern • Three different cable models (low, mid, max) are defined to simulate different transmission channels, which covers typical use cases in the car • Transmitter with predefined amplitude and adjustable rise and fall times drives these cable models 2. Support of simplex and duplex operation • Directional coupler element separates incoming from outgoing signal for duplex • Switch between duplex and additional input for simplex operation 3. Provide the incoming signal from the DUT to • PhLSTT as feedback signal • for signal measurements with oscilloscope www.ruetz-system-solutions.com experts in automotive data communication 8

  9. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 9

  10. MOST Tester Cable Model (MTCM) What's inside the MOST Tester Cable Model? Noise Adder Noise Cable Signal Model Max Shaper 1 Differential Switch Duplex DUT Cable Signal Directional Input Single Model Mid Shaper 2 Coupler Simplex DUT Selection Cable Signal HSD PhLSTT Model Low Simplex DUT Shaper 3 Scope Measurement Amplifier PhLSTT www.ruetz-system-solutions.com experts in automotive data communication

  11. MOST Tester Cable Model (MTCM) What are the required parameters for the Cable Model? FSkin [ Hz/ dB 2 ] DC Loss [ dB] I nput V ss [ m V] Cable m odel into Cable m odel Low low loss test cable low loss test cable 420 (-30) 15x10 6 (± 1x10 6 ) Mid 0.1 (+ 0.1; -0) 360 (± 15) 9.2x10 6 (+ 1x10 6 ; -0) High 0.5 (+ 0; -0.1) 300 (+ 30) Attenuation Conformance Corridor for all Cable Models is ± 1 dB based on MOST150 cPhy Compliance Verification Procedure www.ruetz-system-solutions.com experts in automotive data communication

  12. MOST Tester Cable Model (MTCM) What are the characteristics of each cable model? LOW ( ~ 2 m ) MI D ( ~ 1 5 m ) MAX ( ~ 2 0 m ) www.ruetz-system-solutions.com experts in automotive data communication

  13. MOST Tester Cable Model (MTCM) How does the MTCM look like and how can it be controlled? www.ruetz-system-solutions.com experts in automotive data communication

  14. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 14

  15. MOST150 Test Setup for cPHY What's the configuration for MOST150 cPHY simplex testing? Automation SP3: Coax Cable_Model - Signal Shaper - Cable Model Physical Layer Stress Test Tool SP2: Signal Splitter - Feedback path for PhLSTT - Signal for Oscilloscope  Feedback MOST Tester Cable Model cPhy Simplex SP3 SP2 DUT Oscilloscope www.ruetz-system-solutions.com experts in automotive data communication 15

  16. MOST150 Test Setup for cPHY What's the configuration for MOST150 cPHY duplex testing? Automation SP3: Coax Cable_Model - Signal Shaper - Cable Model Physical Layer Stress Test Tool SP2: Signal Splitter - Directional Coupler - Feedback path for PhLSTT  Feedback - Signal for Oscilloscope - Noise adder (optional) MOST Tester Cable Model Signal cPhy Generator Duplex SP2/ 3 DUT Oscilloscope www.ruetz-system-solutions.com experts in automotive data communication 16

  17. Agenda 1. Introduction 2. Basic Test Setup Requirements 3. MOST Tester Cable Model (MTCM) 4. MOST150 Test Setups for cPHY 5. Summary www.ruetz-system-solutions.com experts in automotive data communication 17

  18. Summary What's the result of the project? • MOST Tester Cable Model provides a highly integrated solution to implement a MOST150 limited cPHY Test Setup • All requirements specified in the MOST150 cPHY Compliance Verification Procedure can be met • MTCM allows easy migration to a MOST150 limited cPHY test setup for those already using an existing MOST150 limited oPHY test setup with a Physical Layer Stress Test Tool. Please visit our booth for m ore inform ation on MOST1 5 0 cPHY Tests www.ruetz-system-solutions.com experts in automotive data communication 18

  19. Thank you for your attention! Jörg Angstenberger Walter-Gropius-Straße 17 80807 München Germany T + 49 / 89 / 200 04 13-0 F + 49 / 89 / 200 04 13-99 info@ruetz-system-solutions.com www.ruetz-system-solutions.com experts in automotive data communication 19

  20. MOST Tester Cable Model (MTCM) Cable Model LOW MI D MAX www.ruetz-system-solutions.com experts in automotive data communication

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