Dead Phones Sent Wall Street Message (Part 2): Bratton and Tumin

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Jan. 12 (Bloomberg) -- On Sept. 11, 2001, when the WorldTrade Center was destroyed in a terrorist attack, the New YorkStock Exchange closed. The enormous trading platform stayed darkfor four straight trading days, longer than at any time sincethe Great Depression.

The attack exposed a hidden risk -- not from terrorists,but from beneath the exchange itself: telecommunications.Service had been lost, and fixing it would take collaboration.