Testing the MOST150 coax Physical Layer MOST Forum Esslingen, - - PowerPoint PPT Presentation

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Testing the MOST150 coax Physical Layer MOST Forum Esslingen, - - PowerPoint PPT Presentation

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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.

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SLIDE 1

www.ruetz-system-solutions.com experts in automotive data communication

MOST Forum Esslingen, 19.04.2016

Testing the MOST150 coax Physical Layer

Jörg Angstenberger

Head of Technology Assessment and Test Laboratory

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SLIDE 2

www.ruetz-system-solutions.com experts in automotive data communication 2

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 3

www.ruetz-system-solutions.com experts in automotive data communication 3

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 4

www.ruetz-system-solutions.com experts in automotive data communication 4

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

Introduction

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SLIDE 5

www.ruetz-system-solutions.com experts in automotive data communication 5

What is the Basic Test Concept for MOST150 limited PHY Layer?

Introduction

SP3

Physical Layer Stress Test Tool DUT

SP2

Physical Layer Stress Test Tool

  • Sets DUT in Retiming Bypass
  • Generation of Stress Pattern
  • Bit Error Check of Feedback Signal
  • Read Error Counters from DUT

Feedback

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SLIDE 6

www.ruetz-system-solutions.com experts in automotive data communication 6

What has to be replaced to get a MOST150 cPHY Test Setup?

Introduction

Feedback

Physical Layer Stress Test Tool Optical Attenuator DUT Oscilloscope Automation Fiber Channel Low/ High BW Optical Splitter Optical Probe

SP3: Optical Fiber Model

  • Optical Attenuator to change optical

input power

  • Fiber Channel to simulate short or

long fiber connection

SP2: Signal Splitter and Converter

  • Return path for PhLSTT
  • Converting optical signal for

Oscilloscope Replaced by an integrated Test Solution that supports cPHY param eters instead

  • f oPHY:

MOST Cable Tester Model

SP3 SP2

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SLIDE 7

www.ruetz-system-solutions.com experts in automotive data communication 7

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 8

www.ruetz-system-solutions.com experts in automotive data communication 8

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

Basic Test Setup Requirements

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SLIDE 9

www.ruetz-system-solutions.com experts in automotive data communication 9

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 10

www.ruetz-system-solutions.com experts in automotive data communication

MOST Tester Cable Model (MTCM)

Switch Input Selection Signal Shaper 1 Directional Coupler Signal Shaper 2 Signal Shaper 3 Measurement Amplifier Cable Model Max Noise Adder Cable Model Low Cable Model Mid

What's inside the MOST Tester Cable Model?

Duplex DUT Simplex DUT Simplex DUT Scope PhLSTT HSD PhLSTT Single Differential Noise

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SLIDE 11

www.ruetz-system-solutions.com experts in automotive data communication

MOST Tester Cable Model (MTCM)

Cable m odel DC Loss [ dB] FSkin [ Hz/ dB2] I nput V ss [ m V] into Cable m odel Low low loss test cable low loss test cable 420 (-30) Mid 0.1 (+ 0.1; -0) 15x106 (± 1x106) 360 (± 15) High 0.5 (+ 0; -0.1) 9.2x106 (+ 1x106; -0) 300 (+ 30)

What are the required parameters for the Cable Model?

Attenuation Conformance Corridor for all Cable Models is ± 1 dB

based on MOST150 cPhy Compliance Verification Procedure

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SLIDE 12

www.ruetz-system-solutions.com experts in automotive data communication

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 )

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SLIDE 13

www.ruetz-system-solutions.com experts in automotive data communication

MOST Tester Cable Model (MTCM) How does the MTCM look like and how can it be controlled?

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SLIDE 14

www.ruetz-system-solutions.com experts in automotive data communication 14

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 15

www.ruetz-system-solutions.com experts in automotive data communication 15

What's the configuration for MOST150 cPHY simplex testing?

MOST150 Test Setup for cPHY

Physical Layer Stress Test Tool MOST Tester Cable Model DUT Oscilloscope Automation

cPhy Simplex Feedback

SP3: Coax Cable_Model

  • Signal Shaper
  • Cable Model

SP2: Signal Splitter

  • Feedback path for PhLSTT
  • Signal for Oscilloscope

SP3 SP2

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SLIDE 16

www.ruetz-system-solutions.com experts in automotive data communication 16

What's the configuration for MOST150 cPHY duplex testing?

MOST150 Test Setup for cPHY

cPhy Duplex Feedback

Physical Layer Stress Test Tool MOST Tester Cable Model DUT Oscilloscope Signal Generator Automation

SP3: Coax Cable_Model

  • Signal Shaper
  • Cable Model

SP2: Signal Splitter

  • Directional Coupler
  • Feedback path for PhLSTT
  • Signal for Oscilloscope
  • Noise adder (optional)

SP2/ 3

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SLIDE 17

www.ruetz-system-solutions.com experts in automotive data communication 17

  • 1. Introduction
  • 2. Basic Test Setup Requirements
  • 3. MOST Tester Cable Model (MTCM)
  • 4. MOST150 Test Setups for cPHY
  • 5. Summary

Agenda

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SLIDE 18

www.ruetz-system-solutions.com experts in automotive data communication 18

What's the result of the project?

Summary

  • 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

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SLIDE 19

www.ruetz-system-solutions.com experts in automotive data communication

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

Thank you for your attention!

19

Jörg Angstenberger

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SLIDE 20

www.ruetz-system-solutions.com experts in automotive data communication

MOST Tester Cable Model (MTCM) Cable Model

LOW MI D MAX