Teledyne LeCroy QPHY-ENET - Manual (Page 37)

QPHY-ENET Software Option
QPHY-ENET Operator’s Manual Rev G
37
10Base-T Common Mode Output Voltage Test
This test ensures that the zero to peak common mode output voltage at the MDI is within conformance limits. The
zero to peak common mode output voltage is measured as the worst-case minimum to worst-case maximum
common mode output voltage. This test does not use a high-pass filter. This measurement is made for pair A
only.
Figure 27. Fixture setup for Common Mode Output Voltage
1. Connect DUT to J67 and connect oscilloscope channel 2 to J2 as shown in
X
Figure 27
X
.
2. Measure pair A by setting jumper J35.
3. The common mode signal must be less than 50 mV to pass the test.