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Green box (phreaking)
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Green box (phreaking) : ウィキペディア英語版
Green box (phreaking)
In Phreaking, the green box was a device whose function was to manipulate the coin collection mechanism of payphones. It employed three of the MF (multi-frequency) tones used in the blue box and could be viewed as a subset of that device.
== Operation ==

There are three basic functions in a green box, and each one is activated with an MF tone. The green box's designers have noted that it is not possible to use the green box from the payphone being manipulated; it can only be used by the called party.

According to the text file "The Green Box" by "The Blue Buccaneer" and "The Tracker", each of these frequencies should be sounded for at least 900 milliseconds. Each should also be preceded with a 2600 Hz "wink", or an MF "8" symbol (900 Hz + 1500 Hz), of about 90 ms in duration, followed by about 60 ms of silence. Most software green boxes emulate this rather than the MF symbols alone.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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