Transmission loss (TL) in general describes the accumulated decrease in intensity of a waveform energy as a wave propagates outwards from a source, or as it propagates through a certain area or through a certain type of structure.
It is a terminology frequently used in radio communication, twisted pair systems (PTSN, Ethernet, etc), optics and acoustics.[1][2] Measures of TL are very important in the industry of acoustic devices such as mufflers and sonars.
^Norton, Kenneth A. (January 1953). "Transmission Loss in Radio Propagation". Proceedings of the IRE. 41 (1): 146–152. doi:10.1109/JRPROC.1953.274172. hdl:2027/mdp.39015077289554. ISSN 2162-6634. S2CID 51651739.
^"The FOA Reference For Fiber Optics - Measuring Power in dB and dBm". www.thefoa.org. Retrieved 2023-04-21.
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