4.2.5 DUT Reception at Low Impedance (PRIME LISN)

CAUTION: For this part of the test, the user has to set up Configuration B. See Figure 2-5.

Configure the DUT as the receiver:

  • Select “Reception” in the DUT instance of the PHY Tester Tool, then click the Next button to continue.
  • In the Reception Parameters tab:
    • Select “Perform EVM and SNR Test” in the reception parameters setup.
  • Click the Next button to continue.
Figure 4-7. Reception Parameters Tab of DUT (Receiver)

Configure the DUT frames (receiver):

  • If the EVM and SNR tests were selected in the previous tab, the configuration of the frames is already done with the following values:
    • Time Interval (ms): 100.
    • Number of frames: 100.
    • Message: [G3|PRIME] IS A GREAT INTEROPERABLE WORLDWIDE TECHNOLOGY, [G3|PRIME] IS A GREAT INTEROPERABLE WORLDWIDE TECHNOLOGY.
  • Click the Next button to continue.
  • In the last tab, Configuration Summary, check that all values correspond to the desired configuration and wait.

Configure the Reference Board as the transmitter:

  • Select “Transmission” in the reference instance of the PHY Tester Tool, then click the Next button to continue.
  • In the Transmission Parameters tab:
    • Select the modulation scheme and type.
    • Enable “Perform EVM and SNR Test” in the configuration setup.
    • As the reference is connected to the 2Ω impedance, select the branch configuration as “Very Low Impedance”.
  • Click the Next button to continue.
Figure 4-8. Transmission Parameters Tab of Reference (Transmitter) in G3-PLC

Configure the reference frames (transmitter):

  • If the EVM and SNR tests were checked in the previous tab, the configuration of the frames is already done with the following values:
    • Time Interval (ms): 100.
    • Number of frames: 100.
    • Message: [G3|PRIME] IS A GREAT INTEROPERABLE WORLDWIDE TECHNOLOGY, [G3|PRIME] IS A GREAT INTEROPERABLE WORLDWIDE TECHNOLOGY.
  • Click the Next button to continue.
  • In the last tab, Configuration Summary, check that all values correspond to the desired configuration and wait.

Run the test:

  1. Set an attenuation level of 0 dB.
  2. Execute the transmission.
  • Go to the receiver PHY Tester Tool instance (DUT in this case), then click the Start Test button.
  • Go to the transmitter PHY Tester Tool instance (Reference in this case), then click the Start Test button.
  • After that, the test with 0 dB of attenuation starts. Now, the transmission and reception processes are visible in both Test Executions windows. If the messages are different, the receiver will not recognize them as valid. If the configured interval and number of frames are different, the statistics computed at the end of the test may be inaccurate. In both boards’ displays, the transmitted/received messages show.

Store the EVM and SNR results in a spreadsheet:

Tip: Remember to mark the following information:

DUT operation (TX or RX) + DUT Position (HIGH or LOW) + AttenuationdB

  • Copy the table with the EVM and SNR results that appears in the receiver PHY Tester Tool instance (reference board in this case) by clicking the Copy Table button.
  • Paste the table in the corresponding spreadsheet created. Marking information can be RxHIGH0dB where:
    • RX: DUT is operating as the receiver.
    • HIGH: DUT is connected in the High impedance side (50R).
    • 0 dB: The attenuation between the DUT and the reference is 0 dB.
  • The user must repeat the above steps, varying the attenuation in each process of measurement (0 dB, 10 dB, 20 dB, 30 dB, 40 dB, 50 dB) and updating the spreadsheet with the obtained values. The user will find some attenuation (normally 50 dB or 60 dB) where the transmission will not be successful.
    Remember: More attenuation points provide more accurate results.