3. Report to the web browser the results of the test.
5.3 Detailed Test information
5.3.1 DCR Resistance Tests
The Advanced Cable Tester utilizes a small current to measure the DC resistance of the
various parts of the cable. The individual pin test relies upon the fact that each end of the
cable has at least two of the four de
fi
ned pins used for each of VBus or Ground. The
total cable DC resistance test relies on the presence of at least one good pin connection
on each end of the cable for the VBus and the Ground connection. If there are not
su
ffi
cient connections for the above tests, the Advanced Cable Tester reports back "no
connection" in the test results. It will report back as much information as it can discern
from the available connections.
NOTE: The Advanced Cable Tester does not use the maximum speci
fi
ced current per
the USB Type-C Speci
fi
cation for the levels of 1.5 A, 3 A, or 5 A for legacy to Type-C or
Type-C to Type-C cables.
5.3.2 Signal Integrity
Each requested test (HS USB and however many SS USB tests are speci
fi
ed) are
performed sequentially by iterating through the speci
fi
ed test rates. The default cases for
USB cables are 500 MBps (HS), 5 GBps, and 10 GBps (SS). The user can set the test
rates between 518 MBps and 12.8 GBps for both types of wires via the interface. If a test
is requested on a particular pair that does not support or is missing the correct
connection, the tester will try multiple times to look for a transmitted signal. If no lock of
the transmitted signal is received this process will slow down the overall test time. There
are two modes for operation of the signal integrity test. The "Lab Mode" switch enables/
disables the ability to look at all possible combinations for the SS pair rourting. It does
not a
ff
ect the HS pair test. When disabled (default) the device only looks for the signals
at the USB Type-C speci
fi
cation locations (i.e., U end TX1, at D end RX1 or RX2
depending on cable orientation). If it is enabled it will look at all possible locations. The
results are returned as unitless measures HEO and VEO. The HEO is the Horizontal Eye
opening, and is a value from 0 to 63 with each unit representing 1/64 of the UI. The VEO
is the Vertical Eye opening, which is a value from 0 to 150 representing the vertical
opening of the recovered eye diagram. Each of these values re measured at the
respective horizontal and vertical centers of the UI. The HEO and the VEO are the
values used for pass/fail criteria.
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