Insertion loss
Loss of signal transmission power when devices are connected to a transmission line / From Wikipedia, the free encyclopedia
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In telecommunications, insertion loss is the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB).
If the power transmitted to the load before insertion is PT and the power received by the load after insertion is PR, then the insertion loss in decibels is given by,