To attenuate means to reduce the strength, intensity, or amplitude of a signal. It is the opposite of boosting.
In commercial and industrial cable systems, attenuation refers to the loss of signal strength as it travels through a transmission medium such as copper or fiber optic cable. The act of attenuating a signal can be intentional, using attenuators or design-based limits, or unintentional, caused by resistance, impedance, or environmental interference over distance.
Understanding attenuation is essential when selecting the appropriate cable type, length, shielding, and signal source to ensure that data, audio, or video signals maintain integrity throughout a system. High-frequency signals, in particular, are more susceptible to attenuation, making careful material selection critical in systems supporting Ethernet, HD-SDI, RF, and AV transmission over long runs.
Attenuation is measured in decibels (dB) and is typically documented as a loss per unit length. In fiber optic systems, attenuation can also result from splicing, bending, or connector loss, while in copper-based cabling, it’s often influenced by conductor gauge, dielectric quality, and overall construction.
Also referred to as signal loss or power reduction.
Commonly referenced in performance standards set by ANSI, TIA, and IEEE.