1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
Intel Confidential 141
100Base-TX Test Procedure for the 82544 Chip
I.4.4 Test Fixtures
100 Ohm UTP Test Load. Fixture: F9.1.2.A.
I.4.5 Test Procedure
1. Connect the test equipment and Unit Under Test (UUT), as shown in Figure I-2.
2. Use software or firmware control to force the unit under test to transmit frames in 100BASE-
TX mode.
3. Configure the oscilloscope according to Table I-3 and Table I-4.
Table I-3. For Positive Peak Differential Output Amplitude
Table I-4. For Negative Peak Differential Output Amplitude
I.4.6 Notes for Using Pulse-Width Triggering
Note: Most of the following procedure is very similar to the procedure for 9.1.2.1 Differential Output
Voltage (Appendix I.3) except: (1) the horizontal scale is only 1 nsec per division, and (2) the
operator is required to scroll left and right through the pulse -- to see if the MLT mid-level
shoulders are at least 20 nsec wide on both sides of the pulse; AND for rise and fall times, the
operator must make several different plots with both horizontal cursors and “cross-hair” cursors.
1. Set the trigger level to ~500 mV.
2. Select Pulse-Width triggering.
3. Start with the upper bound at ~118 nsec, and the lower bound at ~106 nsec.
4. Set the Trigger Mode to NORMAL.
Scope Parameter Setting
Horizontal Scale 1 ns/division
Vertical Range -100 mV to +1100 mV (1200 mV over the full vertical scale)
Vertical Position -3.5 divisions to -4.0 divisions
Trigger Type
Positive, Pulse Width Triggering:
~116 ns lower bound, ~124 ns upper bound
(If shorter pulses are used, the lower bound may be lowered.)
Trigger Level +500 mV
Trigger Signal Differential signal at the pins of the test load.
Scope Parameter Setting
Horizontal Scale 1 ns/division
Vertical Range -1100 mV to +100 mV (1200 mV over the full vertical scale)
Vertical Position +3.5 divisions to +4.0 divisions
Trigger Type
Negative, Pulse Width Triggering:
~116 ns lower bound, ~124 ns upper bound
(If shorter pulses are used, the lower bound may be lowered.)
Trigger Level -500 mV
Trigger Signal Differential signal at the pins of the test load.
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