Intel 1000BASE-T

10Base-T TD Circuit Common-Mode Output Voltage
1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
80 Intel Confidential
7. Adjust trigger level until just triggering on signal. Place cursor on maximum or peak voltage.
(The figure below provides a negative peak reference.)
Figure 20-3. Negative Peak Voltage Scope Reference
8. Record maximum or peak amplitude value(s).
9. Verify the measurements meet specifications.