doc: uptade v3 shielding test
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@ -53,10 +53,9 @@ Although there 4 ground and 4 power pins, there are only 1 ground and 1 power wi
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The pins are inter-connected in the plugs on each side of the cable.
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- SHIELD: ensures the shell of the plugs are connected on both sides of the cable.
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This does not ensure if there is really a shield in the cable, or just a wire.
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It also can't ensure the shell is simply shorted to GND.
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These limitations are outside of the scope of this tester since I haven't seen any cable cheating this way.
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Also, If the cable has a shield, but only connected one plug, this will not be detected.
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It also ensures the shield is grounded, as required by the specification.
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This does not verify if the cable has proper shield foil and braid though, or it's just a wire (I haven't seen a cable cheating this way yet).
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Also, if the cable has a shield, but only connected on one plug or it is not connected to ground, this will not be detected.
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- USB2: ensures the UTP wire are present, used for USB 2.0 data transfer.
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There is only one pair of UTP wire for the Dp and Dn signals using for USB 2.0 communication, connected to A6 and A7 on both sides.
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