Tellabs Inc. (TLAB) posted a wider-than-expected second-quarter loss and announced a restructuring plan that will cut annual expenses by about $50 million.

The company also forecast third-quarter revenue of $325 million to $345 million, while analysts surveyed by Thomson Reuters currently expect $350 million.

Tellabs plans to eliminate about 330 jobs, or 10% of its work force, through the second quarter of 2012. The company estimated pretax charges at $13 million for the reductions and $9 million for facility and asset-related charges.

"We are investing aggressively in research and development, devoting one-fourth of our revenue to growth products, as we focus on next-generation platforms to help customers succeed in the mobile Internet," said President and Chief Executive Rob Pullen.

This is the third consecutive quarterly loss for the telecommunications-equipment maker, which has lately had a decline in revenue in North America, the biggest contributor to its top line. Tellabs has been increasing its research and development spending to focus more on mobile Internet. This long-term growth plan has also hurt the company's bottom line and margins in recent quarters.

Tellabs reported a loss of $20.1 million, or 6 cents a share, compared with a profit $64.1 million, or 16 cents, a year earlier. Analysts polled by Thomson Reuters had most recently forecast a loss of 3 cents.

Revenue dropped 21% to $334.2 million, compared with its April forecast of $325 million to $345 million.

Gross margin fell to 37.4% from 53.5%.

Revenue from customers in North America dropped 46% to $177.2 million, while revenue outside North America increased 70% to $157 million.

Revenue for broadband--the company's biggest segment--declined 29%, while transport and services revenue fell by 14% and 6%, respectively.

Shares closed Monday at $4.19 and were inactive premarket. The stock has fallen 46% over the past year.

-By Melodie Warner, Dow Jones Newswires; 212-416-2283; melodie.warner@dowjones.com

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