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H1102 transformer functions

Discussion in 'Electronic Basics' started by eeh, Apr 24, 2005.

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  1. eeh

    eeh Guest

    Hi,

    I saw the datasheet of pulse H1102 ethernet magnetic but cannot
    understand the theory.

    I want to know what is the function of the transformers interfacing to
    the RJ45 ethernet network. Is it used to reject common mode noise?

    Besides, why do I need to use the magnetic to interface to ethernet?

    Thanks!
     
  2. Andrew Holme

    Andrew Holme Guest

    Yes; and for isolation - to protect sensitive inputs from different mains
    earth voltages around the building.
    Well, if you're just experimenting - with short CAT5 cable runs - you don't.
    This guy connected the pins of an FPGA directly to his hub for transmitting,
    and just used a simple discrete-transistor differential-amplifier for
    receiving:

    http://www.fpga4fun.com/10BASE-T.html

    I wouldn't do it without magnetics myself. It's not that hard. I used the
    SI-10021 RJ45 connector with integral magnetics from RS Components in this
    project:

    http://www.holmea.demon.co.uk/Ethernet/EthernetRx.htm
     
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