4.2.3 DUT Reception at High Impedance Mode

CAUTION: For this part of the test, the user has to set up the Configuration A, refer to the Figure 2-6.

Configure the DUT as receiver:

  • Select “Reception” in the DUT instance of the PHY Tester Tool, then press 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 4-3. Reception Parameters Tab of DUT (Receiver)

Configure the DUT frames (receiver):

  • If the EVM and SNR test were checked in the previous tab, the configuration of the frames will be 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 transmitter:

  • Select “Transmission” in the reference instance of the PHY Tester Tool, then press 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 a reference is connected in a high impedance network, set the branch configuration as “High Impedance”.
  • Click the Next button to continue.
Figure 4-4. Transmission Parameters Tab of Reference (Transmitter) for G3-PLC

Configure the Reference Board frames (transmitter):

  • If you have checked the EVM and SNR test in the previous tab, the configuration of the frames will be already done with the following values:
    • Time Interval (ms): 100.
    • Number of frames: 100.
    • Message: [G3|PRIME] IS A GREAT INTEROPERABLE WORLDWIDE TECHNOLOGY, [G3|PLC] 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 process is observable in both Test Executions windows. If messages are different, the receiver will not recognize them as a 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 board’s displays the transmitted/received messages display.

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 appear 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 RxLOW0dB where:
    • RX: DUT is operating as receiver.
    • LOW: DUT is connected in the low impedance side.
    • 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.