IEC 61156-8-2013 pdf Multicore and symmetrical pair/quad cables for digital communications – Part 8: Symmetrical pair/quad cables with transmission characteristics up to 1 200 MHz – Work area wiring – Sectional specification

6.3.7 Alien (exogenous) near-end crosstalk Generally proven by design. 6.3.8 Alien (exogenous) far-end crosstalk Generally proven by design. 6.3.9 Alien (exogenous) crosstalk of bundled cables The minimum requirement is not specified but it should be stated in the relevant detail specification. 6.3.10 Impedance The mean characteristic impedance shall be within ±5 % of the requested nominal impedance at 1 00 MHz. 6.3.11 Return loss (RL) The minimum return loss of any pair in the frequency 1 MHz to 1 200 MHz shall be equal to or greater than the values obtained from Table 4.
6.4.11 Repeated bending of the cable The cable shall withstand 500 cycles without cracking of the insulation or sheath or loss of continuity of the metallic components. 6.4.12 Tensile performance of the cable The tensile strength of the cable is not specified but may be indicated in the relevant detail specification. 6.4.13 Shock test of the cable Not applicable. 6.4.14 Bump test of the cable Not applicable. 6.4.15 Vibration test of a cable Not applicable. 6.5 6.5.1 Environmental characteristics Shrinkage of insulation When tested at (1 00 ± 2) °C for 1 h, the shrinkage of the insulation shall not exceed 5 %. The length of the sample shall be 1 50 mm, and the shrink-back shall be measured as the sum from both ends. 6.5.2 Wrapping test of insulation after thermal ageing Not applicable. 6.5.3 Bending test of insulation at low temperature The bending test of the insulated conductor shall be carried out at (–20 ± 2) °C. The mandrel diameter shall be 6 mm. There shall be no cracks in the insulation. 6.5.4 Elongation at break of the sheath after ageing The ageing regime shall be 7 days at (1 00 ± 2) °C. The tensile strength shall not be less than 50 % of the unaged value. 6.5.5 Tensile strength of the sheath after ageing The ageing regime shall be 7 days at (1 00 ± 2) °C. The elongation shall not be less than 70 % of the unaged value. 6.5.6 Sheath pressure test at high temperature Not applicable. 6.5.7 Cold bend test of the cable The bending test shall be carried out at (–20 ± 2) °C. The mandrel diameter shall be eight times the overall diameter of the cable. There shall be no cracks in the sheath.