{{short description|Immediate change in a complex system with no phase-in period}} {{ic|date=October 2017}}
A '''flash cut''', also called a '''flash cutover''', is an immediate change in a complex system, with no phase-in period.
In the United States, some telephone area codes were split without a period to allow customers to readjust, learn, or change equipment, such as a permissive dialing period.
Another example is an immediate switch from an analog television channel to a digital television channel on the same frequency, where the two cannot operate in parallel without interference.
A flash cut can also define a procedure in which multiple components of computer infrastructure are upgraded in multiple ways, all at once, with no phase-in period.
== See also == * Big bang adoption * Flag day (software) * Dagen H, when Sweden switched from driving on the left-hand side of the road to the right * Smash cut, an abrupt change of scene in a motion picture
== External links == * [http://www.nap.edu/openbook.php?record_id=11027&page=2 Letter Report to the FBI (2004), Computer Science and Telecommunications Board (CSTB)] * [https://patents.google.com/patent/US5764754 US Patent 5764754 - Subscriber loop reconnection device and method] * {{YouTube|saRir95iIWk|Speedy Cutover Service, SXS Switching Cutover to ESS Filmed Live at Glendale CA Central Office, 1984}} – From AT&T's archives
Category:Telephone numbers Category:Digital television
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