This standard specifies that polyethylene is used as an insulator, the outer conductor is braided, and a compound mainly made of vinyl chloride resin (hereinafter referred to as vinyl) is used as a sheath, which is used for connections of high-frequency equipment, internal wiring, power supply lines, etc. Specifies high frequency coaxial cables (hereinafter referred to as cables) with characteristic impedances of 50Ω and 75Ω.