What is the standard impedance for common copper twisted pair cabling?

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What is the standard impedance for common copper twisted pair cabling?

Copper twisted-pair cabling used in Ethernet is designed as a balanced transmission line with a differential characteristic impedance of about 100 ohms. This impedance comes from the two-conductor geometry and the dielectric between them, and it’s chosen to preserve signal integrity and minimize reflections as signals travel to and from network devices. Ethernet standards such as 100BASE-TX and 1000BASE-T assume this 100-ohm differential impedance, and equipment is designed to work with it, ensuring reliable data transmission over the common copper cables. Minor variations can occur due to manufacturing tolerances, but the nominal impedance for typical copper twisted-pair cabling is 100 ohms. Other values, like 50 ohms, 75 ohms, or 120 ohms, pertain to different media and applications.

Copper twisted-pair cabling used in Ethernet is designed as a balanced transmission line with a differential characteristic impedance of about 100 ohms. This impedance comes from the two-conductor geometry and the dielectric between them, and it’s chosen to preserve signal integrity and minimize reflections as signals travel to and from network devices. Ethernet standards such as 100BASE-TX and 1000BASE-T assume this 100-ohm differential impedance, and equipment is designed to work with it, ensuring reliable data transmission over the common copper cables. Minor variations can occur due to manufacturing tolerances, but the nominal impedance for typical copper twisted-pair cabling is 100 ohms. Other values, like 50 ohms, 75 ohms, or 120 ohms, pertain to different media and applications.

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