High transmission rates up to 100 Mbit/s place high demands on a cable’s structure and composite materials.
Running a cable inside a cable carrier subjects these materials to additional mechanical stress and results in long-lasting changes to the cable’s electrical properties.
A test was conducted on a Chainflex® CAT5 cable to determine whether - even when subjected to high stress at its minimum bending radius - the cable continued to meet the electrical requirements of cabling standard IEC 61156-6.
A CF14-02-04-02-CAT5 cable was selected, which has four pairs of stranded cores with a nominal cross section of 0.01 mm2 per pair. The conductor consists of bare copper wires and is surrounded by an insulation sheath made from foamed PE.
The following items were assessed:
Characteristic wave impedance of single pairs
Return loss of single pairs
Near-end crosstalk attenuation of single pairs versus one another
The maximum values of the individual attenuation for each pair of cores are specified for the corresponding nominal characteristic wave impedance in dB/328 ft in the DIN IEC 61156-6 standard. Accordingly, cables are subdivided into several categories according to transmission frequency. For the cable being tested, transmission frequencies up to 100 MHz were planned, which corresponded to category 5e.
The attenuation, as a measure of the reduction in transmitted electrical energy of a signal on the cable, remains below the specified limit, even after more than 1.5 million cycles while being subjected to high mechanical stress at its minimum bend radius.
Electrical transmission quantities, such as wave impedance, return loss and near-end crosstalk, comply with the IEC's electrical standards for a category 5 cable.
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