The New York Stock Exchange early Wednesday put into effect its so-called "Rule 48" for the second time this week, aiming to smooth the opening of trading on a session that is expected to get volatile.

Rule 48 allows designated market makers on the NYSE to refrain from disseminating price indications ahead of the opening bell. The procedure makes it easier and faster to open stocks on days when trading could be rough.

Big Board parent NYSE Euronext put "Rule 48" into effect Monday for the first time since Jan. 27.

Dow Jones Industrial Average futures pointed to a sharply lower open Wednesday, falling 254 points to 10940 as 9:20 a.m. ET approached.

-By Brendan Conway, Dow Jones Newswires; (212) 416-2670; brendan.conway@dowjones.com

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