pre linkové nesymetrické prepojenie používam koaxiálny reprokábel SPK225

The USB cable is asymmetrical, poorly shielded, has inadequate ground connection. The cable deteriorates the signal quality, radiates signal harmonics and has insufficient shield attenuation towards external
interference sources.

The cable has four wires, which are precisely defined - the
data wires are 28 AWG (American Wire Gauge) and the
supply wires are 20 to 28 AWG. This defines the diameter
and copper resistance, the HF conductor parameters result
from the further structure. The two supply wires are
untwisted, the data wires are twisted around one another, this
results in the differential mode impedance of 45 Ω or 90 Ω
(+/- 15%) against ground. The cable shielding should have a
shielding braid with an area coverage of at least 65% and also
an aluminum shield, i.e. double shielding is intended to
guarantee high shield attenuation and consistent wave
impedance for the cable. I can confirm from practice that
there are many "black sheep" on the market, some of which
only have an aluminum shield and even this consists of a foil
that is only metalized on one side. Structured like this, the
"shield" leaves a gap over the entire length of the cable and
so the shield attenuation hardly attains values over 15 dB
rather than the common >50 dB - but it is cheap!

vyšší průřez žil než běžné kabely
resp.
Kabel má nezvykle vysoký průřez jednotlivých žil, které jsou z extra čisté PCOCC (monokrystalické) mědi.

To co bezne pocuvam nehovori nic o tom co pocujem.