Teledyne LeCroy QPHY-ENET User Manual

Page 50

QPHY-ENET Operator’s Manual Rev G

10. The Average Result checkbox is checked by default. Entering a number in the Avg Weight field causes

the selected number of waveforms to be averaged for each pulse (A, B, C, D, E and F).

Note: The templates used in this test have a very tight tolerance so even a small amount of noise in the measurement setup can cause mask
failures. It is recommended that averaging be used to reduce the measurement noise. The waveform looks distorted and may fail the mask
while the averaging accumulates.

11. Parameters P1 through P4 indicate the peak differential voltages at points A, B, C, and D. P5 indicates

the average absolute value of the peak voltages at A and B. P6 and P7 are the droop values.

12. The pass/fail qualifiers in Q1 through Q8 test the measurements against the standard requirements. The

criteria are listed below each qualifier. More detail on each of the criteria can be viewed by clicking on the
qualifier.

13. The Mask Tests tab shows the test results for the 6 masks defined by the standard. The Mask Tests

table lists the test result (OK/FAIL) for each mask. Clicking on any one of the tests in the list displays the
corresponding pulse with its compliance mask. A red circle highlights points where the curve touches the
mask.

14. Check the Show all Masks checkbox to view an octal grid displaying all of the mask tests on one screen.

The two grids on the top left of the display are reserved for the oscilloscope trace and the trace filtered by
the measurement filter (labeled EnetDta).

Note: The octal grid appears very small on the screen. Click the Close button at the top right of the menu to close it and expand the view. The
menu can be re-displayed by clicking on any one of the waveform descriptor boxes at the bottom left of the display or by selecting “Ethernet
tests” in the Analysis menu.

15. Repeat steps 9 through 14 for the other three pairs on the device by changing jumpers according to the

table in step 5.

Figure 38. 1000Base-T mode 1 test showing all masks