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The two large thru-hole pins (not numbered) connect to the metal shielding on the outside of the jack. These are directly connected to DGND to shield against electrical noise inside the jack.
 
The two large thru-hole pins (not numbered) connect to the metal shielding on the outside of the jack. These are directly connected to DGND to shield against electrical noise inside the jack.
   −
The two plastic thru-hole pins are not conductive and have no electrical connection. They are present only for structural purposes, presumably to prevent stress of the solder points when an ethernet wire is inserted or removed from the jack.
+
The two plastic thru-hole pins are not conductive and have no electrical connection. They are present only for structural purposes, presumably to prevent stress on the solder points when an ethernet wire is inserted or removed from the jack.
    
=== Crystal Oscillator ===
 
=== Crystal Oscillator ===
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