Automotive Ethernet Compliance Testing

Transcription

1 Automotive Ethernet Compliance Testing Dr. Ernst Flemming Product Manager Rohde & Schwarz GmbH & Co. KG Munich, Germany

2 The company group at a glance ı History Established 1933 in Munich, Germany ı Type of enterprise Independent family-owned company ı Global presence In over 70 countries, approx. 60 subsidiaries ı Net revenue Approx. EUR 1.75 billion (FY 13/14, July through June) ı Export share More than 90 percent ı Employees 9800 worldwide, with approx in Germany ı Success A leading international supplier in all of its fields of business 2

3 Worldwide solutions ı Wireless communications Development and production test solutions for every second mobile phone in the world ı Television Transmitters for more than 80 countries ı Air traffic control Radiocommunications for more than 200 airports and ATC centers ı Secure communications Radios in use worldwide for all branches of the armed forces ı Management of the frequency spectrum Instruments and systems for radiomonitoring and radiolocation for about 150 countries ı Service & services To be as close to the customer as possible, nearly 70 locations worldwide 3

4 BroadR-Reach Ethernet Technical Background I ı BroadR-Reach is derived from 100BASE-Tx and 1000BASE-T Ethernet ı Standardized by the OPEN alliance ı Future IEEE 100BASE-T1 Standard ı Simple wiring: single unshielded twisted-pair ı 3 levels: PAM 3 modulation to reach 100 Mbit/s ı Simultaneous: full-duplex communication 4

5 BroadR-Reach Ethernet Technical Background II 15 nsec ı BroadR-Reach Ethernet has 3 levels and a transmission frequency of 66⅔ MHz 5

6 BroadR-Reach Ethernet Signal Integrity ı CAN is tested with eye diagram test ı For BroadR-Reach, a compliance test is specified similar to 1000BASE-T compliance focuses on transmitter signal quality Special test signals are mandatory 6

7 Ethernet Compliance Test: BroadR-Reach Test Specification The following PHY tests are specified by the IEEE: I. Transmitter droop II. Transmit clock frequency of 66 ⅔ MHz ±0.01% III. Transmitted jitter in master and slave (opt.) mode IV. Power spectral density V. Return loss measurements VI. Transmitter distortion 5 different test modes 7

8 Compliance Test I: Transmitter Droop ı Test mode 1 (40 transmits of +1 followed by 40 transmits of -1) ı Specification: Max droop after 500 ns of 26.9% ı Test Setup 8

9 Compliance Test II: Transmitter Clock Frequency ı Measurement of the clock frequency ı Test mode 2 (sequence +1, -1) ı Specification: Transmitted clock MHz < f < MHz ı Test setup 9

10 Compliance Test III: Transmitted Jitter Master Mode: Measurement of the jitter of the transmitted clock Test Mode 2 (sequence +1, -1) Specification: RMS Jitter < 50 ps Test Setup: Optionally: Test the clock in slave mode 10

11 Compliance Test IV: Power Spectral Density ı Test Mode 5 (random sequence of {-1, 0, +1}) ı Can be done with R&S RTO Oscilloscope ı Specification: limits Limit Mask ı Test Setup: Limit Mask 11

12 Compliance Test V: Return Loss Measurement ı Test Equipment: Network Analyzer. Automatic test support for R&S ZVL and R&S ZNB ı Calibration is mandatory ı Test Mode 4 (well defined pattern) ı Specification: Return loss (S11) shall be below 18 db (1-20 MHz) 18 * 10*log(f/20) db (20-66 MHz) with 100 Ohm ref. impedance ı Small peak at 33 MHz is test signal 12

13 Compliance Test VI: Distortion ı Includes 5.4 V 20.3 MHz distortion signal from signal generator, e.g. HMF2550 ı Test mode 4: well defined pattern signal ı Measurement: Based on 2047 x 6= symbols MATLAB script is provided in specification max distortion below 15 mv Signal Generator Oscilloscope Test assumes accurate clock but clock accuracy is 100 ppm 13

14 Compliance Test VI: Distortion: Frequency Lock is Mandatory With Reference Clock Synchronization No Reference Clock Synchronization 14

15 R&S RTO-K24 BroadR-Reach Compliance Test ı Tests can be done manually with an oscilloscope, signal generator and Network Analyzer ı Automatic test solution R&S RTO-K24 provides: automatic test and measurement Full documentation Reliable and repeatable results ı Test Fixture R&S RT-ZF2 and R&S RT-ZF3 provide: Easy probing Frequency Converter to 10 MHz 15

16 Rohde & Schwarz Provides a Complete Test Solution R&S RTO-K24 BroadR-Reach Ethernet Compliance Test ı Covers all specified tests ı Manual margin setting ı Fully guided test execution ı Strong reporting functionality ı Frequency Down Converter available Test Solution R&S RTO Oscilloscope R&S RTO-B4 OCXO Option R&S RTO-K24 option and R&S ScopeSuite Software R&S RT-ZF2 Test Fixture R&S RT-ZF3 Frequency Down Converter R&S RT-ZD10 Active Differential Probe Hameg HMF2550 signal generator or similar R&S ZVL vector network analyzer or similar 16

17 A Complete Portfolio for the Automotive Industry ı ı ı Oscilloscopes from 50 MHz to 4 GHz, Spectrum and Network Analyzers, Signal generators and more Software options for trigger & decode on automotive protocols: CAN, CAN-FD, LIN, FlexRay, SENT Compliance Tests BroadR-Reach Ethernet: RTO-K24 100BASE-T Ethernet, USB, MIPI, R&S HMO1000 R&S HMO Kompakt R&S HMO3000 R&S RTM R&S RTE R&S RTO I2C/UART/SPI X X X X X X LIN T&D X X X X X X CAN T&D X X X X X X CAN-FD T&D X X FlexRay T&D X X Compliance Tests X