# Flash cut

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> Markdown URL: https://mediated.wiki/source/Flash_cut.md
> Source: https://en.wikipedia.org/wiki/Flash_cut
> Source revision: 1353203227
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{{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](/source/United_States), some telephone [area code](/source/area_code)s were [split](/source/area_code_split) without a period to allow customers to readjust, learn, or change equipment, such as a [permissive dialing](/source/permissive_dialing) period.

Another example is an immediate switch from an [analog television](/source/analog_television) channel to a [digital television](/source/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](/source/Big_bang_adoption)
* [Flag day (software)](/source/Flag_day_(software))
* [Dagen H](/source/Dagen_H), when Sweden switched from driving on the left-hand side of the road to the right
* [Smash cut](/source/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](/source/AT%26T)'s archives

Category:Telephone numbers
Category:Digital television

{{telecom-stub}}

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Adapted from the Wikipedia article [Flash cut](https://en.wikipedia.org/wiki/Flash_cut) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Flash_cut?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.