Teledyne-lecroy QPHY-ENET Manuel d'utilisateur télécharger pdf (Page 26)

QPHY-ENET Operator’s Manual Rev G

6. Click the Set Up and Start Test button to start the test and display the pass/fail results.

7. Repeat the mask test for each of the test loads (100 Ω, LOAD1, and LOAD2) by changing jumpers setting

in Table 2, and for each pulse polarity (normal and inverted). There will be total 6 mask tests. Be sure to

touch the Set Up and Start Test button after each test is selected.

8. Remove jumpers J1, J6, J14, J16, and install jumpers J7, J8, J9, J10, to test without TPM.

9. Connect SMA cables from oscilloscope Channel 2 to fixture J84, Channel 3 to J85 (

Figure 14

10. Select DOV Peak in the “Select Test” field, then touch the Set Up and Start Test button. The screen will

change and the peak differential output voltage (DOV) will be measured. Parameter P1 indicates the peak

voltage, and Q1 and Q2 test the upper and lower limits of this value.

11. Select DOV Harmonics in the “Select Test” field, then touch the Set Up and Start Test button. The

display will show the Ethernet signal trace, and P1 will display the peak harmonic level in the power

spectrum of the signal. The Device Under Test should be transmitting an “all ones” pattern, which will be

coded as alternating positive and negative going pulses. This waveform will give the worst-case power

spectrum with the highest-level harmonics.

Figure 15. 10Base-T DOV Mask Test

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Teledyne-lecroy QPHY-ENET Manuel d'utilisateur Page 26