3.2.2. Minimum Limit Tests

Filename

xena_lt_coeff_min_limit.py

To make the test port to respond COEFF_AT_LIMIT when decrementing a coefficient on the remote transmitter.

Number of <repetitions>, default to 1
AN/LT Configuration
- AN enabled/disabled.
- <preset> the remote transmitter should start.
- <coefficients> of the remote transmitter.
- LT control action: DECREMENT
- <serdes> the serdes lane(s) to test
Port configuration
- Interface type, e.g. QSFPDD 100G CR
- Serdes speed
- Number of Serdes (read-only)

If AN is enabled, test port starts AN + interactive LT. Else, start interactive LT on the port.
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.
LT Phase:
- 3.1. Request the remote transmitter to use PAM4 or PAM with Precoding modulation.
- 3.2. Request the remote transmitter to use <preset> on each specified Serdes.
- 3.3. Request the remote transmitter to DECREMENT coefficient on each specified Serdes.
- 3.4. If the response is COEFF_AT_LIMIT or COEFF_NOT_SUPPORTED, then test is OK.
- 3.5. If the response is EQ_AT_LIMIT or COEFF_EQ_AT_LIMIT or frame lock is lost, then the test is failed.
- 3.6. Report the response on each specified Serdes.
Stop AN and LT on the test port.
Repeat 1-4 until all <coefficients> are tested.
Repeat 1-5 until all <repetitions> are tested.

Note

This test may cause the local port to lose frame lock to the remote port.