When using bad quality cables, influences such as cable attenuation, crosstalk and jitters affect these signals so strongly, that the receiver can not create a picture.Bad quality cables influence cable attenuation, crosstalk and jitters, these signals are affected so strongly that the receiver can not create a picture. The display will only remain black. Exceptionally fast data streams required for the display of 1080p pictures can not be transmitted. The receiver then automatically switches to a poorer resolution.
Why does transmedia guarantee the quality of its cables?
Actually, it is not difficult to produce a quality cable, provided that the necessary know how exists. transmedia explicitly uses the best raw material, such as OFC copper. All cables correspond to the HDMI Organisation norm, even for the 2.0 version. This is inspected by our suppliers in Far East in detail as well as from us. As far as we know, we are the only importer of HDMI cables Europe-wide, who possesses the testing systems for HDMI cables. This enables us to determine all criteria for the rating of cables (so called S-parameter) and present an eye diagram.
How to recognise the difference between Good and Bad?
Due to the prices, producers often try to save on the material, therefore, bad quality cables are often thinner. Additionally,
raw materials such as copper are substituted by cheap materials such as aluminium or even iron. Not only this, but also cable cross-sections are too small. Instead of using 0,24 mm2, which is obligatory for long cables, only 0,08 mm2 is used – which makes just 1/3
of the material. Many bad quality cables are produced
Depending on the cable’s length, the signals are transmitted so poorly that the resolution is so bad and with long cables these, signals are not even able to create a picture.
The eye diagram is a very important measurement in proving that the monitor accurately recognises the digital nulls (no signals) and ones (signals). The stronger the existing and thoroughly defined free fields are affected or crossed out, the less possibility is for the expected picture to be displayed (see the red streams in the pictures). With a quality cable the free fields are circled generously. No faults can be found. This is exactly the technique our department for incoming inspection control uses for all HDMI cables. Those which do not meet our HDMI standards, fail our tests and are blocked from our system.