Intel 1000BASE-T

100Base-TX Duty Cycle Distortion (DCD)
1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
52 Intel Confidential
13.4 Test Fixtures
100 Ω UTP test load (Appendix A.1)
13.5 Test Procedure
1. Connect the test equipment and UUT as shown below.
Figure 13-2. Test Setup 1
2. From the 100 BASE-TX PHY Configuration Tests menu, select the Duty Cycle Distortion:
9.1.8 test.
3. Configure the oscilloscope according to the following table.
Differential Probe
w/ 1 GHz BW
Unit Under Test
(UUT)
Digitizing
Oscilloscope
Test Fixture 40-25
100 Ohm Resistive Load
RX
RJ-45
TX
Table 13-1. Setting for Duty Cycle Distortion (DCD)
Scope Parameter Setting
Horizontal Scale ~5 ns/division
Vertical Range -1200 mV to +1200 mV (2400 mV over the full vertical scale)
Trigger Type
Positive pulse width triggering:
~14 ns lower bound, ~18 ns upper bound
Trigger Level 400 mV
Display Type Average