Microchip VSC7427 Manual

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ENT-AN0061

Application Note

Transmitter Testing of 10/100/1000BASE-T

June 2018

Transmitter Testing of 10/100/1000BASE-T

VPPD-02009 ENT-AN0061 Application Note Revision 1.1

Contents

1 Revision History ............................................................................................................................. 1

1.1 Revision 1.1 ........................................................................................................................................

1.2 Revision 1.0 ........................................................................................................................................

2 Transmitter Testing of 10/100/1000BASE-T .................................................................................. 2

2.1 Overview .............................................................................................................................................

2.2 Compliance Individual Tests ............................................................................................................... 2

2.2.1 1000BASE-T PMA Output Voltage/Droop/Template Tests ..................................................................... 2

2.2.2 1000BASE-T PMA Transmitter Timing Jitter ............................................................................................ 3

2.2.3 1000BASE-T PMA Transmitter Distortion ................................................................................................ 3

2.2.4 1000BASE-T PMA Common-Mode Output Voltage ................................................................................. 4

2.2.5 100BASE-TX PMD Active Output Interface Template Tests .................................................................... 4

2.2.6 10BASE-T MAU Peak Differential Output Voltage Test ........................................................................... 5

2.2.7 10BASE-T MAU Transmitter Waveform for Start of TP_IDL .................................................................... 5

2.2.8 10BASE-T MAU TD Return Loss ............................................................................................................... 6

2.3 Equipment Needed .............................................................................................................................

2.4 Configuring the Test Equipment ......................................................................................................... 6

2.4.1 Scope, Probe, and Application Calibration .............................................................................................. 7

2.4.2 Verify Probe Calibration .......................................................................................................................... 7

2.4.3 Tips For Proper Testing ............................................................................................................................ 7

2.5 Configuring the DUT for Analog Compliance Tests ............................................................................ 7

2.5.1 10BASE-T Amplitude Testing ................................................................................................................... 7

2.5.2 100BT Amplitude Testing ........................................................................................................................ 7

2.5.3 1000BT Amplitude Testing ...................................................................................................................... 8

2.6 1000BASE-T PMA Testing with Disturbing Signal ............................................................................... 8

2.7 Board/Magnetic Considerations ......................................................................................................... 9

2.8 Conclusion ..........................................................................................................................................