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 dB is given by,
Read more about Insertion Loss: Electronic Filters, Link With Scattering Parameters
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“Nothing is so important to man as his own state; nothing is so formidable to him as eternity. And thus it is unnatural that there should be men indifferent to the loss of their existence and to the perils of everlasting suffering.”
—Blaise Pascal (1623–1662)