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Patching points ( insert points) on a wide range of equipment. An unusual example is the Enigma machine, which featured a plugboard as part of its encryption system.

Ranjan Parekh; Ranjan (2006). Principles of Multimedia. Tata McGraw-Hill Education. pp.225–. ISBN 978-0-07-058833-2. To achieve balanced mono, the sleeve acts as the return wire while the ring acts as the negative signal and the tip as the positive signal. To get unbalanced stereo signals, the sleeve serves as the ground/return wire while the ring acts as the right audio channel and the tip to act as the left audio channel.Xperia range uses different 3.5mm headset standard | Xperia Blog". www.xperiablog.net. 27 February 2012 . Retrieved 2017-08-17. Some sound recording devices use a three-conductor phone connector as a mono microphone input, using the tip as the signal path and the ring to connect a standby switch on the microphone. The ring which serves as a conductor introduces the possibilities of balanced or unbalanced mono and stereo signals. Commercial and general aviation (GA) civil aircraft headsets often use a pair of phone connectors. A standard 1⁄ 4-inch (6.3 mm) 2 or 3-conductor plug, type PJ-055, is used for headphones. For the microphone, a smaller 3⁄ 16-inch (0.206inch / 5.23 mm) diameter 3-conductor plug, type PJ-068, is used.

Before the CTIA was an older standard known as the OMTP. The difference between CTIA and OMTP is that in OMTP the sleeve served as the common return and ground wire while one ring conductor served as the microphone audio wire 5 Conductor Plugs/TRRRS Audio signals can be transmitted to the headphones via mono-aural (Mono) signal, or stereophonic (Stereo) signal. A stereo signal uses two audio channels (left and right) while a mono signal uses one audio channel.

MIL-P-642/2, also known as PJ-051. (Similar to Western Electric WE-310, and thus not compatible with EIA RS-453)

Modern phone connectors are available in three standard sizes. The original 1⁄ 4 inch (6.35mm) version descends from as early as 1877, when the first-ever telephone switchboard was installed at 109 Court Street in Boston in a building owned by Charles Williams, Jr.; [8] or 1878, when an early switchboard was used for the first commercial manual telephone exchange [9] [10] in New Haven, Connecticut created by George W. Coy. [11] [12] The 1877 switchboard was last known to be located in the lobby of 185 Franklin Street, Boston. [8] Chapuis, Robert J. (2003). 100 Years of Telephone Switching. Amsterdam, the Netherlands: IOS Press. p.51. ISBN 9784274906114.iphone - Why do Chinese EarPods not work with German MacBook Pro?". Ask Different . Retrieved 2020-04-24.

U.S. military versions of the Western Electric plugs were initially specified in Amendment No.1, MIL-P-642, and included:

Reference Designations for Electrical and Electronics Parts and Equipment: ASME Y14.44-2008 (Replaced IEEE 200-1975): Section 2.1.5.3. ASME, Fairfield, NJ. 2008. Archived from the original on 2010-03-13. When Phone Operators Were Unruly Teenage Boys". The Atlantic. 19 September 2014 . Retrieved 2017-10-25. The shorter 15mm TRRS variant is more common and physically compatible with standard 3.5mm TRS and TS connectors.