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Original question:

DP83869EVM: Help with Fiber-Electrical Conversion

DP83869EVM: DP83869EVM. Media Convertor Mode(HW, no use mcu)

DONGMIN LIM
Prodigy 10 points
Part Number: DP83869EVM
Other Parts Discussed in Thread: DP83869HM, DP83869

Tool/software:

"I set up the following configuration:

PC (192.168.100.22) - Ethernet Cable - DP83869EVM RJ45 <-> Fiber <-> Other Media Converter <-> Ethernet Cable <-> PC (192.168.100.13)

I confirmed that the 'Other Media Converter' is working correctly. However, I was unable to ping from PC to PC. Therefore, I consulted the DP83869HM datasheet and found the relevant commands.

After setting up the Media Converter Mode, I was able to connect the PCs and ping successfully.

Now I have one question:

  1. Since I'm not using the MCU's MDC and MDIO, is there an alternative method for configuring the mode using circuit modifications?"

I hope this helps.

  • 0
    TI__Genius 16121 points

    Hi Dongmin, 

    You can strap to the following modes:

    Please use yellow for 1000M and green for 100M. 

    Below shows the strapping mode:




    Note that if the link drops from 1000M to 100M, DP83869HM will not be able to pick up the link. 

    Hope this helps. Please let me know if you have any other questions. 

    Best,

    J

  • +1 in reply to J
    Prodigy 10 points

    Good!!

  • 0 in reply to J
    Prodigy 10 points

    I was operating the DP83869EVM in a test setup, and when I changed the slot connector from fiber to copper, it didn't connect. However, after powering it off and on again, it started operating normally.

    So, it seems that changing the connector while it's operating prevents a proper connection, right?

  • 0 in reply to DONGMIN LIM
    TI__Genius 16121 points

    Hi, 

    DONGMIN LIM said:
    when I changed the slot connector from fiber to copper

    What do you mean by this?

    If the link is lost and regained on either copper or fiber connector, you can enable link loss pass through feature via strapping to inform the connector on the other side that the connection is lost. If not, the far end will not be able to get the information that the link was lost. 



    Best,
    J

  • 0 in reply to J
    Prodigy 10 points

    Hot-swapping the SFP in the DP83869EVM from copper to fiber while powered on causes the connection to drop. Power cycling the DP83869EVM restores the connection. Is this normal behavior?

  • 0 in reply to DONGMIN LIM
    TI__Genius 16121 points

    Hi Dongmin, 

    If the link loss pass through is not enabled, the connection may not be re-established because the far end will not detect the link was dropped in the first place. Hence, the far end will not try to re-establish the link without forcing it. Does this behavior happen after link loss pass through is enabled?

    Best,
    J

  • 0 in reply to J
    Prodigy 10 points

    First, the EVM board has link loss pass through enabled by default. I'm not sure about the other media converter. I will check that.

    Additionally, we use the DP83867ISRGZR in our mass-produced chips. This component also supports SGMII. Does this mean this component also supports Media Converter mode?

  • +1 in reply to DONGMIN LIM
    TI__Genius 16121 points

    Hi, 

    Please check if the other media converter has it enabled.

    No, DP83867 does not support media converter mode.

    Best,
    J

  • 0 in reply to J
    Prodigy 10 points

    If you connect the SGMII lines of the DP83867 to the SFP slot lines in the same way as the DP83869, wouldn't it also support FIBER & COPPER operation? In that case, it doesn't seem to be much different from the Media Converter mode.

  • +1 in reply to DONGMIN LIM
    Prodigy 10 points

    i'm sorry. i wrong understand. Fiber SPF Transciever is not SGMII Signal. DP83867 is not operate.