signal transmission

{{Short description|Process of sending or propagating a signal}}

{{Other uses of|Transmission}}

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{{Use American English|date=March 2021}}

File:TV antenna.JPG used for transmission of radio signals]]

In telecommunications, transmission (sometimes abbreviated as "TX") is the process of sending or propagating an analog or digital signal via a medium that is wired, wireless, or fiber-optic.{{cite journal |title=Telecommunications Technology Fundamentals |url=http://www.informit.com/articles/article.aspx?p=24687 |website=informit.com |date=28 December 2001}}{{cite journal |title=Telecommunications Media |url=http://www.britannica.com/EBchecked/topic/585825/telecommunications-media/279805/Transmission-media-and-the-problem-of-signal-degradation |website=britannica.com|date=21 January 2014}}

Transmission system technologies typically refer to physical layer protocol duties such as modulation, demodulation, line coding, equalization, error control, bit synchronization and multiplexing, but it may also involve higher-layer protocol duties, for example, digitizing an analog signal, and data compression.

Transmission of a digital message, or of a digitized analog signal, is known as data transmission.

Examples of transmission are the sending of signals with limited duration, for example, a block or packet of data, a phone call, or an email.