Communication cable

A communication cable comprising a central interposer having cross sectional area of S1, four twisted wire pairs T1, T2, T3, T4 made by twisting pairs of insulated wires each made by covering an electrically conductive wire with an insulating material, each pair being twisted with a twist pitch different from the others, and two inter-pair interposers, first inter-pair interposer Q1 and second inter-pair interposer Q2, wherein said four twisted wire pairs and said two inter-pair interposers are disposed around said central interposer while being entwined with each other, pitch P1 of said twisted wire pair T1, pitch P2 of the twisted wire pair T2, pitch P3 of the twisted wire pair T3 and pitch P4 of the twisted wire pair T4 are set to satisfy a relationship of inequality P1<P2<P3<P4, a diameter d of each insulated wire that constitutes the twisted wire pairs and said cross sectional area S1 of the central interposer satisfy the relationship of inequality

• S1≧[{4.1 d/(1+{square root over (2)})}·0.35]2×π
• while said first inter-pair interposer Q1 is disposed to adjoin the twisted wire pair T1 having the least pitch P1 with a specific dielectric constant that decreases the propagation delay time of the adjoining twisted wire pair T1, said second inter-pair interposer Q2 is disposed to adjoin the twisted wire pair T4 having the largest pitch P4 with a specific dielectric constant that increases the propagation delay time of the adjoining twisted wire pair T4, the twisted wire pair T1 having the least pitch P1 is located at such a position that does not adjoin the twisted wire pair T4 having the largest pitch P4 and said second inter-pair interposer Q2, and the twisted wire pair T4 having the largest pitch P4 is located at such a position that does not adjoin the twisted wire pair T1 having the least pitch P1 and said first inter-pair interposer Q1.