Flash cut
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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.
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. Letter Report to the FBI (2004), Computer Science and Telecommunications Board (CSTB) US Patent 5764754 - Subscriber loop reconnection device and method – From AT&T's archives
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