Rules for the Technical Engineering of Cable Radio and Television Systems Article 23
The nominal characteristics impedance of the coaxial cable used in the system and the subscriber terminal should be 75 ohm.
中文原文 有線廣播電視系統工程技術管理辦法第23條
系統使用之同軸電纜及訂戶終端點之公稱特性阻抗應為七十五歐姆。