Dm800se network information

Discussion in 'Schematic drawings, Pcb images etc..' started by Johnny B., Aug 13, 2015.

  1. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    With network problems, it is often not a hardware problem.
    Often, it is related to the software, or the network system.

    But sometimes it's a hardware problem, and with a little luck confined to the connector.
    In any case, this information can help you find the problem.

    Good luck.

    Network information image,

    [​IMG]

    Datasheet network connector.
    dm800se-j1000-network-XMG-RMS-001B-08A0-GY-N.pdf
     

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    Last edited: Aug 16, 2015
  2. SaintRafik

    SaintRafik New Member

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    Are the elements have the value?

    L1000 - 0.39uH 1206 ±10%
    C1001 - 1nF 0603 50V ±10%
    C1002 - 1nF 0603 50V ±10%
    C1003 - 1nF 0603 50V ±10%
     
  3. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah indeed, they probably have a similar value as the 800hd.

    My measurement..
    L1000 - 0.38uH
    C1001 - 967.3pF
    C1002 - 899.8pF
    C1003 - 889.6pF

    (note that 1nF = 1000pF)
    And so, the 800hd ceramic caps and inductor values should be fine.
     
  4. SaintRafik

    SaintRafik New Member

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    So 1nF with a tolerance of 10% will be the right one.
    Thank you very much for precise measurements. I think that the replacement of these elements fix a problem with the LAN port in Dm800se HD
     
  5. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yes quite possibly, the damage depends on what is happened with the network.

    For example, by lightning it could be limited to the network connector coils and other parts, which are present internally in the connector.
    Networkconn.jpg
    In that case, the whole connector must be replaced for a new one.
    By bad luck, damaged network connections to one or more cpu pins.
    But this can be measured with ohms when the network connector has been removed, or at least if the rx/tx +/- connector pins are separated from the circuit.

    PoE network pins...
    If something has happened to the PoE (Power over Ethernet) connections, than it could be the parts you want to replace.
    Nevertheless, the network will not work on a problem with the PoE circuit.