3.1.3. Link Performance Test

Filename

xena_lt_preset_performance.py

Objective

To measure the link training BER performances of the remote transmitter using the specified preset.

Configurations

• Number of <repetitions>, default to 1

• AN/LT Configuration

  • AN enabled/disabled.

  • <preset> the remote transmitter should use.

  • <serdes> the serdes lane(s) to test

• Port configuration

  • Interface type, e.g. QSFPDD 100G CR

  • Serdes speed

  • Number of Serdes (read-only)

Procedure

1. If AN is enabled, test port starts AN + interactive LT. Else, start interactive LT on the port.

2. AN Phase

   • 2.1. If AN result is AN_GOOD_CHECK, continue to LT Phase.

   • 2.2. If AN result is not AN_GOOD_CHECK, quit the test and report AN failure with the AN status.

3. LT Phase:

   • 3.1. Request the remote transmitter to use PAM4 or PAM with Precoding modulation.

   • 3.2. Request the remote transmitter to use a <preset> on each specified Serdes.

   • 3.3. Read frame lock status of each specified Serdes.

   • 3.4. Read LT BER each specified Serdes.

   • 3.5. Announce trained on all Serdes to close LT.

4. Stop AN and LT on the test port.

5. Repeat 1-4 until all <repetitions> are done.

Statistics

• Timestamp

• Repetition #

• AN status

• For each Serdes

  • Preset

  • LT PRBS total bits

  • LT PRBS errored bits

  • LT PRBS BER