Ethernet 1000BASE-T Disturber

The PMA Transmitter shall comply with the electrical specifications defined in IEEE Std 802.3™-2022, Clause 40.4.2.2 Compliance must be verified under two test conditions:

Clean Signal Condition: The transmitted signal is measured using an Ethernet Fixture Resistive Load Board in a low-noise environment to establish baseline compliance.
Disturbed Signal Condition: The transmitted signal is subjected to an externally introduced disturbance, emulated by a sine wave injection in conjunction with this 1000BASE-T Ethernet Disturber. This simulates realistic interference conditions for stress testing transmitter performance.

Measurements should confirm that the transmitter maintains specification-compliant signaling in both conditions.

Can be used by any brand of oscilloscope with enough bandwidth such as Rohde & Schwarz, Tektronix, Keysight / Agilent, Teledyne Lecroy, Yokogawa, Siglent, Rigol, Micsig, GW Instek, UNI-T, …

Description

1000BASE-T Disturber

1000BaseT

Peak differential output voltage (IEEE Std 802.3™‐2022 – 40.6.1.2.1) with external disturbing signal of 2.8V pkp sine wave @ 31.25 MHz.
Maximum Output Droop (IEEE Std 802.3™‐2022 – 40.6.1.2.2) with external disturbing signal of 2.8V pkp sine wave @ 31.25 MHz.
Differential output templates (IEEE Std 802.3™‐2022 – 40.6.1.2.3) with external disturbing signal of 2.8V pkp sine wave @ 31.25 MHz.
Transmitter Distortion (IEEE Std 802.3™‐2022 – 40.6.1.2.4) with external disturbing signal of 5.4V pkp sine wave @ 20.833 MHz.

Testing shall be done on all 4 Pairs A, B, C and D with external disturbing signal connected via SMA.
Beside a suitable oscilloscope a suitable differential probe and sine wave generator is required for the following measurements.

	Pattern	Criteria
40.6.1.2.1
Voltage Point A	Test Mode 1	670 mV <= x <= 820 mV
Voltage Point B	Test Mode 1	670 mV <= x <= 820 mV
Voltage Point A B difference	Test Mode 1	x <= 1 %
Voltage difference between Point C and AVG(A,B)/2	Test Mode 1	x <= 2 %
Voltage difference between Point D and AVG(A,B)/2	Test Mode 1	x <= 2 %
40.6.1.2.2
Voltage magnitude at point G versus point F	Test Mode 1	x >= 73.1 %
Voltage magnitude at point J versus point H	Test Mode 1	x >= 73.1 %
40.6.1.2.3
Differential Output Templates	Test Mode 1	Multiple Mask for A, B, C, D, F and H
40.6.1.2.4
Transmitter Distortion – Minimum peak distortion	Test Mode 4	x < 10 mV
Percentage of eye opening within limit	Test Mode 4	x >= 60 %