doc: uptade v3 shielding test

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King Kévin 2022-09-09 13:15:44 +02:00
parent 2ae4cf223d
commit ac4a673ad6
1 changed files with 3 additions and 4 deletions

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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
The pins are inter-connected in the plugs on each side of the cable.
- SHIELD: ensures the shell of the plugs are connected on both sides of the cable.
This does not ensure if there is really a shield in the cable, or just a wire.
It also can't ensure the shell is simply shorted to GND.
These limitations are outside of the scope of this tester since I haven't seen any cable cheating this way.
Also, If the cable has a shield, but only connected one plug, this will not be detected.
It also ensures the shield is grounded, as required by the specification.
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).
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.
- USB2: ensures the UTP wire are present, used for USB 2.0 data transfer.
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.