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picture1_Ethernet Ppt 76851 | Bobsmithterm


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File: Ethernet Ppt 76851 | Bobsmithterm
typical ethernet circuit diff pairs from rj45 connect to isolation transformer diff pairs from transformer connect to ethernet phy ic 100 diff pairs are terminated at the phy ethernet magnetics ...

icon picture PPTX Filetype Power Point PPTX | Posted on 02 Sep 2022 | 3 years ago
Partial capture of text on file.
   TYPICAL ETHERNET CIRCUIT
   •
    Diff pairs from RJ45 connect to isolation transformer
   •
    Diff pairs from transformer connect to Ethernet Phy IC
   •
    100Ω diff pairs are terminated at the Phy
    ETHERNET MAGNETICS
                                 Most Ethernet 
                                   magnetics come with 
                                   integrated CM chokes
                                 Transformer center 
                                   taps provide access to 
                                   CM signals
   ROBERT SMITH TERMINATION 
   METHOD
                       US Patent 5321372, 
                        Published 6/14/1994
                       The combination of 
                        pairs within a UTP 
                        cable form 
                        transmission line
                       CM currents can flow 
                        on these transmission 
                        lines, causing 
                        radiated emissions
   WAS SMITH WRONG?
   Article on EE Times by Jim Satterwhite
   Author asserts that Smith was wrong about the 
    value that should be used for the termination.
   Presents measurements and claims that the 
    appropriate termination resistance is 52.3Ω
   GOAL OF THIS PROJECT
   How much of an impact does this termination 
    actually have on radiated emissions?
   Marine VHF band (156 – 165 MHz) of particular 
    interest
   Evaluated by measuring CM current on cable
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...Typical ethernet circuit diff pairs from rj connect to isolation transformer phy ic are terminated at the magnetics most come with integrated cm chokes center taps provide access signals robert smith termination method us patent published combination of within a utp cable form transmission line currents can flow on these lines causing radiated emissions was wrong article ee times by jim satterwhite author asserts that about value should be used for presents measurements and claims appropriate resistance is goal this project how much an impact does actually have marine vhf band mhz particular interest evaluated measuring current...

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