Editing Signal transmission (section)

{{Short description|Process of sending or propagating a signal}}
{{Other uses of|Transmission}}
{{More citations needed|date=December 2006}}
{{Use American English|date=March 2021}}

[[File:TV antenna.JPG|thumb|[[Antenna (radio)|Antenna]] used for transmission of radio signals]]

In [[telecommunications]], '''transmission''' (sometimes abbreviated as "TX") is the process of [[sending]] or propagating an [[Analog signal|analog]] or [[digital signal]] via a [[transmission medium|medium]] that is [[wired communication|wired]], [[wireless]], or [[fiber-optic communication|fiber-optic]].<ref>{{cite journal |title=Telecommunications Technology Fundamentals |url=http://www.informit.com/articles/article.aspx?p=24687 |website=informit.com |date=28 December 2001}}</ref><ref>{{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}}</ref>

[[Transmission system]] technologies typically refer to [[physical layer]] protocol duties such as [[modulation]], [[demodulation]], [[line coding]], [[Equalization (communications)|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 [[Network packet|packet]] of data, a phone call, or an email.