SAN FRANCISCO -- Shares of Tellabs slid more than 20% to $5.63 Tuesday morning after the company reported disappointing results for the fourth quarter and issued a forecast that was also below Wall Street's expectations. Earnings on a non-GAAP basis fell to 2 cents per share from 9 cents in the same period last year; analysts were expecting earnings of 8 cents a share. The company predicted a revenue range of $315 million to $335 million for the first quarter -- well below the $403 million expected by analysts.

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