Overview 1
Keysight E6961A User Guide and Method of Implementation 41
MDI Return Loss Test Information
This test can run with an external vector network analyzer. However, an ENA
exported data file in the Touchstone or CITI format can also be used in place of
the external vector network analyzer.
Reference [2] specifies that the MDI return loss shall meet or exceed the following
equation for all frequencies ranging from 1 MHz to 66 MHz (with 100 Ω reference
impedance) at all times when the PHY is transmitting data or control symbols.
Calibrate the ENA prior to running the tests. Set the ENA as follows:
Measurement: Ref1 Fwd S11
Start Frequency: 1 MHz
Stop Frequency: 66 MHz
Turn Averaging On
Table 1-4 Frequency and Return Loss
Frequency Return Loss (dB)
1 - 30 MHz 20
30 - 66 MHz 20 - 20*log(f/30)
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