The New York Stock Exchange early Monday put into effect its so-called "Rule 48," aiming to smooth the opening of U.S. stock trading on a session that is expected to get rocky.

Rule 48 allows designated market makers on the NYSE to refrain from disseminating price indications ahead of the opening bell. The idea is to make it easier and faster to open stocks on days when trading is poised to become especially volatile.

Big Board parent NYSE Euronext last put "Rule 48" into effect Jan. 27.

Futures on the Dow Jones Industrial Average pointed Monday to a sharply lower open, recently down 323 points at 11,154, in the first trading session after Standard & Poor's downgraded the U.S. credit rating.

-By Jacob Bunge, Dow Jones Newswires; 312 750 4117; jacob.bunge@dowjones.com

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