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QPHY-ENET Operator’s Manual Rev G

1000Base-T Peak Differential Voltage, Droop, Template - Mode 1 with Disturbing Signal

This test is defined in 40.6.1.2.1 as: The absolute value of the peak of the waveform at point A and B, as defined

Figure 35

, shall fall within the range of 0.67V to 0.82 V (0.75 V +/-0.83 dB). These measurements are to be

made for each pair while operating in test mode 1 and observing the differential signal output at the MDI using the

transmitter test fixture with no intervening cable.

This test is performed on a physical interface transmitting the mode 1 waveform. Test section D is used to

perform the peak voltage and template tests. The disturbing sine wave is required for these tests. If you test mode

1 and 4 without disturbing sine wave, please refer to the

Mode 1 and Mode 4 without Disturbing Signal

topic

on page

. When a disturbing signal is not used, the measurement should be made with the device terminated

into a 100 Ω resistive load. The difference of the peak absolute value at the points A and B should be less than

1 %. Ideally, the peak voltage at points C and D is 0.5 times the average of the peak voltage at points A and B.

The absolute value of the peak voltage at point C and D difference should be less than 2 % from the ideal voltage.

Note: The method for putting a particular PHY device into this and the other test modes required for 1000Base-T tests is unique to the

manufacturer. Contact the manufacturer of your PHY device for information on how to do this.

Figure 36. Fixture setup for Mode 1 and Mode 4 test with Disturbing Signal

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Teledyne-lecroy QPHY-ENET Manuel d'utilisateur Page 48