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Original question:

DP83848K: Unable to establish connection, no ping

DP83848K: The network connection suddenly does not connect, and the LED is not controlled

yue Liu
Prodigy 10 points
Part Number: DP83848K


During normal use, the network suddenly interrupted and the LED no longer lit. We tried multiple times to unplug the network cable and reconnect, but we still couldn't connect, and at this time, both LEDs were not lit.
Later on, we found out that sometimes even after unplugging the network cable, both LEDs are lit up. However, in this case, the network still cannot be connected.
Strangely, we did not perform any hardware operations, and in the next day's testing, this network interface inexplicably worked again.
Our question is:
Firstly, under what circumstances may the outgoing network cable suddenly interrupt and cannot be connected?
Secondly, what are the possible reasons why the LED still lights up when the network port is not plugged in? Which signals should we focus on testing？

Can you help analyze this problem? Thank you!

  • 0
    TI__Mastermind 40525 points

    Hello,

    Without controlled repeatability, this will be difficult to debug. A potential theory is that the PHY is reset, thus explaining why the network is interrupted, and afterwards the auto-polarity was reconfigured in the opposite manner, thus also explaining why LEDs light up with cable unplugged. If there is repeatability, I would recommend checking the power, clock, reset, and special connection pins of the PHY.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    Prodigy 10 points

    Thanks so much for your patient answer.

    but we have tested the power supply and clock and found no abnormalities.

    In our circuit, under normal circumstances, if PHY is reset, only the green LED will light up and the other one will not. Therefore, we need to consult if there are other possible reasons why both LEDs are lit up with cable unplugge?

    thanks!

  • 0 in reply to yue Liu
    TI__Mastermind 40525 points

    Hello,

    What do you mean by the green LED? Could you possibly send a snapshot of the schematic for further context?

    If both LEDs polarity are flipped this would case this symptom. While this has tough reproducibility, you would need to check the pins at the moment in time the PHY loses link unexpectedly,

    Sincerely,

    Gerome