SNLA383 august   2023 DP83822H , DP83822HF , DP83822I , DP83822IF

 

  1.   1
  2.   DP83822 Cable Break Test for Profinet Compliance
  3.   Trademarks
  4. 1Introduction
  5. 2Test Setup and Procedure
  6. 3Cable Break Test
    1. 3.1 Cable Break Test Script Configuration
    2. 3.2 Post-Script Results
  7. 4Conclusion

3 Cable Break Test

The cable break test was executed using both the auto-negotiation settings and forced mode settings for both the DP83822 and the link partner. Each disruption occured at least 500 times during a test with a certain cable length.

For a scenario to pass, the following requirements must be met:

  1. The time to detect link down when a disruption is activated must be less than 15 μsec for both auto-negotiation and forced mode.
  2. While the disruption is active, a link down status must always be recognized.
  3. When the disruption is removed, a stable link up must be acheived within 30 ms for forced mode, or 5 sec for auto-negotiation mode.
  4. After the disruption is removed, there must be no further indication of a link drop or unstable connection.

For the cable break test to pass as a whole, all scenarios must pass.

The following section contains the script to configure the DP83822 for the cable break test. The script in the following section is formatted for use with the USB-2-MDIO tool. When using the USB-2-MDIO tool, the extended registers setting must be set to "yes".