1000BASE-T Maximum Output Droop
1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
16
Intel Confidential
3.3
Test Equipment
•
Oscilloscope with 1GHz or greater bandwidth
•
Differential probe with 1 GHz or greater bandwidth
•
UUT with gigconf.exe test software
3.4
Test Fixtures
•
100
Ω
UTP test load (
).
3.5
Test Procedure
1. Connect the test equipment as shown in the figure below.
2. Set the probe to divide by 10 and to full bandwidth.
3. Select the Droop: 40.6.1.2.2 Test from the 1000BASE-T PHY Configuration Tests menu in
gigconf.exe.
4. Adjust the oscilloscope to the settings for Points F and G.
5. Measure the output voltage with a differential probe connected across the 100-ohm test load
for each channel.
Differential Probe
w/ 1 GHz BW
Unit Under Test
(UUT)
Digitizing
Oscilloscope
Test Fixture 40-25
100 Ohm Resistive Load
RX
RJ-45
TX
Point F and G: Pulse Droop
Trigger Settings
Trigger Type
Polarity
Limits
Level
Pulse width
Negative
5.6 ns to 8.6 ns
-500 mV
Scaling
Vertical Scale
Vertical Position
Horizontal Scale
150 mV / division
+3.0 division
200 ns / division
Cursors
Display Mode
Acquisition Mode
Horizontal bars for
F; Crosshairs for F
and G
Vectors
Average on