Total Phase Advanced Cable Tester User Manual page 26

Eye diagrams are the complete UI results for each test. They are returned in the results
page for visual inspection but not used for pass/fail criteria.
5.3.3 Digital Pins
For the digital pins, which are defined as: SBU1, SBU2, DP1/DM1, and DP2/DM2 a
simple continuity test is used to verify presence or absence. This test will fail if the lines
are AC coupled between the Up and the Down port of the ACT. The test consists of
applying a voltage at one end of the cable and measuring the incoming signal at the far
end of the cable. The inputs are weakly pulled to the rail to prevent any false readings
from a floating conductor. (NOTE: The DP/DM pairs are also tested with high-speed
signal when the Signal Integrity option is purchased.)
5.3.4 E-Marker
The E-marker reading is achieved by sending a USB Power Delivery compliant query to
the cable when VConn is supplied. The ACT sends a SOP' and SOP'' message from
both the Up and the Down ports so as to verify presence of any content from both ends
of the cable. In the case of a Type-C to Legacy cable, the messages are only sent from
the Type-C end. All retrieved data from the cable is displayed in the results page. The
read of the CC is not dependent on Ra presence.
5.3.5 Shield
The shield of the cable is tested in different ways depending on the type of cable under
test. For a cable a simple detection first determines if the shield is connected to ground
at either end of the cable. If it is, no further testing is undertaken as it is indiscernable
from the ground circuits. If the shield is not connected to the cable ground, the shield
continuity is checked with a simple continuity test as used above for the digital pins.
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