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How to support two RJ45 port with only one ethernet MAC

Jason Shen
Intellectual 1965 points
Other Parts Discussed in Thread: TS3L501E

Dear experts, 

The customer have only one Ethernet MAC in the processor, and want to support TWO RJ45 port. I think there have 2 solution like below figure shows, really appreciate you can have some suggestion about which solution is prefer and which PHY(support Gigabit) and switch device can be used for the solution?

  • 0
    TI__Mastermind 19780 points
    Hi Jason,

    I don't think your diagram has come through. I just see a small box.

    If the customer wants to retrieve information from both ports at the same time, they will need a 3-port switch and 2 PHYs.

    If they want to manually choose between the 2 RJ45 ports, this can be done with a MUX on the RJ45 ports. This can be done with a TS3L501E device.

    Best Regards,
  • 0 in reply to Rob Rodrigues
    TI__Intellectual 1965 points

    Hi Rob

    Thanks for your help, and I think TS3L501E can work for the switch solution for below diagram. so the analog switch is after the PHY and before the transformer, right?

    and I still have an confuse if the customer want to support 1000M Gigabit ethernet, could you have an advise for the bandwidth 600MHz of TS3L501E is enough.

    Thanks, you give me a great support.

  • 0 in reply to Jason Shen
    TI__Mastermind 19780 points

    Hi Jason,

    You are correct about the placement of the TS3L501E.  It would be placed between the PHY and the transformer.  This would mean using 2 transformers and 2 RJ45 ports.

    The TS3L501E has enough bandwidth to work with 1000M Ethernet.  The analog bandwidth of 1000M is much lower than the data rate.

    Best Regards,