| 摘要 |
PROBLEM TO BE SOLVED: To provide a good transmission characteristic even in high-speed communication of 156Mbps by securing a margin decided by ISO/IEC-IS11801 regarding multiple cross talks so as to securing a multiple cross talks characteristic, dealing with the application of a different characteristic impedance by one communication cable and setting an ACR value at frequency 156MHz to be +10dB or higher. SOLUTION: A communication cable 10 is provided with a collecting twisting layer 12. The collection twisting layer 12 is formed by diagonally arranging two pairs of 14L1 and 14L2 having a characteristic impedance of 100Ωand two pairs of 14H1 and 14H2 having a characteristic impedance of 120Ωvia an interposition 22. The outer diameters 16 of the insulated electric wires of these pairs 14L1 and 14L2 are equal and the outer diameters of the insulated electric wires of the pairs 14H1 and 14H2 are equal. But the outer diameters 16 of the insulated electric wires between the pairs 14L1 and 14L2 and the pairs 14H1 and 14H2 are different. Further, the twisting pitches of these pairs 14 are selected and set so as to satisfy a specified condition.
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