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DP83848YB: Application Inquiry

Renan Santos Adriano
Mastermind 18395 points
Part Number: DP83848YB

Hello Team,

My customer needs confirmation about the device  DP83848YB 100BT mode.

Since 100BASE-TX isn't dependent on link polarity. The IEEE 802.3 standard doesn't specify that 100BASE-TX should not rely on link polarity and uses  MLT-3. However, if the polarity of the diff pair were reversed at the cable or PWB (P/N vs. N/P), wouldn’t that result in inverting the transitions (H/L vs L/H) and therefore inverting the data?

Thanks in advance.

Regards
Renan

  • +1
    TI__Mastermind 20046 points

    Hi Renan,

    MLT3 has a natural immunity to polarity swaps, since the data is encoded in the transitions, not the steady state values. A transition of any kind transmits a 1 bit, while no transition transmits a 0 bit. It does not matter in which direction the transition occurs (H/L vs L/H), so it does not matter what the polarity of the connection is. Hope this helps.

    Thanks,

    David