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How to connect two Ethernet PHY devices on the same PCB point-to-point ?

Discussion in 'Embedded' started by John Babcock, Mar 18, 2007.

  1. John Babcock

    John Babcock Guest

    Hi group,

    If I have TXD+, TXD-, RXD+ and RXD- from two different Ethernet PHY devices
    that I want to connect together point-to-point ... do I have to use two
    transformers to connect the devices ? Or can I simply connect TXD+ (dev A)
    with RXD+ (devB) and so on ?

    I really want to avoid using the transformers. Can I use the decoupling
    circuit converting the differential signal to digital logic signal ??? and
    then back to differential of the other device ?

    John Babcock, Mar 18, 2007
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  2. John Babcock

    Stan Katz Guest

    I've had success just using in line capacitors - I don't have access to the
    system anymore
    but we were connecting 2 Realtek 5 port switches to get the 2 cpu's linked
    and 8 external
    ports. I think we got the component values from one of their application
    notes where then
    connected one port of their switch to a CPU with internal PHY.

    Stan Katz
    Stan Katz, Mar 18, 2007
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