Characteristic Impedance of Coaxial Cable: The average characteristic impedance of a coaxial cable is 50 ± 2 Ω. The periodic variation of impedance along a single coaxial cable follows a sinusoidal pattern, with a deviation of ± 3 Ω from the central mean over a length of less than 2 meters.
Attenuation of Coaxial Cable: This generally refers to the attenuation value of a 500-meter cable segment. When measured using a 10 MHz sine wave, the value does not exceed 8.5 dB (17 dB/km); when measured using a 5 MHz sine wave, the value does not exceed 6.0 dB (12 dB/km).
Propagation Velocity of Coaxial Cable: The minimum required propagation velocity is 0.77C (where C represents the speed of light).
DC Loop Resistance of Coaxial Cable: The sum of the resistance of the cable's central conductor and the resistance of its shielding layer does not exceed 10 mΩ/meter (measured at 20°C). An RF coaxial cable is defined as a cable featuring two concentric conductors, wherein both the inner conductor and the outer shielding layer share a common central axis. It is another type of cabling widely utilized in computer networks. Because it features an insulating layer wrapped around the central conductor-which is, in turn, encased by a layer of braided metal shielding-it effectively blocks external electromagnetic interference, thereby enhancing communication quality.
