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(Beginner) Ethernet interface

Discussion in 'Electronic Basics' started by Ant_Magma, Feb 16, 2006.

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  1. Ant_Magma

    Ant_Magma Guest

    I have a module that requires an Ethernet interface.

    Do i only need a PHY transceiver such as the KENDIN KS8721B PHY
    transceiver and a RJ45 jack?

    There's this thing called a single port (surface mount) magnetics. It's
    gotta do with line isolation? Do i need it or is it optional?
  2. Noway2

    Noway2 Guest

    Ethernet communications are typically modeled as consisting of several
    layers. Towards the bottom of the layers is the PHY interface. While
    I haven't looked up the device that you referenced, the PHY chip will
    be responsible for handling the low level signal receive and transmit
    in addition to things such as ascertaining what speed of network it is
    connected to. On top of this is a layer that is responsible for
    breaking the messages into packets (and receiving the packets)
    generating and decoding the checksums, etc. This functionality may be
    implemented in this hardware or it may be delegated to a higher level
    control. On top of this, you have protocol systems for the connections
    andfor the application data transfer. The devices that you need will
    depend on what level of functionaily you are tyring to implement. It
    is a pretty safe bet, however, that you will need a lot more than a PHY
    chip and a port jack.

    Regarding the magnetics. a transformer will block any DC signals,
    providing a DC isolation between the controller and the network. This
    is necessary because of a lack of reference potential between the
    networked elements. The transformer will still pass the AC or changing
    signals which compose the communications.
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