Shares of Ikanos Communications ( IKAN) were among technology's losers Thursday, plunging 33% after the maker of broadband-network-equipment chips warned that its third- and fourth-quarter revenue will miss expectations.

The company estimates third-quarter revenue of $36 million to $37 million, down from an earlier view of $40 million to $43 million. Analysts project revenue of $42 million. For the fourth quarter, the company sees revenue of $24 million to $26 million, substantially below the $43.3 million that analysts project.

"While we had orders for our fourth-generation and newly released fifth-generation chipsets in Q3, our shipments of these solutions were limited due to product delays and manufacturing constraints," Ikanos said. "Looking to our fourth quarter, we believe that revenue will be affected due to general weakness in the overall communications sector and some deployment delays." Shares were trading down $3.66 to $7.28.

Intermec ( IN) also slashed its revenue forecast, sending shares down 14%. The company expects to post third-quarter revenue of $192 million to $196 million, compared with its earlier forecast for revenue of $230 million to $240 million. Analysts polled by Thomson First Call project revenue of $237.2 million.

"The company's revised guidance reflects an estimated decrease of its systems and solutions revenues of about 20% and a decrease of service revenue of about 5% over the comparable prior-year quarter," Intermec said. Shares were trading down $3.69 to $23.62.

Dobson Communications ( DCEL) jumped 15% after the wireless provider posted solid third-quarter subscriber results. The company added about 23,500 net subscribers during the period, reversing the trend from last year when it lost 24,100 subscribers. With the third-quarter results, the company has already exceeded the guidance it gave for 2006 net subscriber additions. Dobson continues to see full-year average revenue per unit of $48 to $48.50 and earnings before interest, taxes, depreciation and amortization of $435 million to $445 million Shares were adding $1.01 to $7.75.

Par Technology ( PTC) tumbled 18% after the company warned that third-quarter results would be well below Wall Street's forecast. The company, a maker of software systems for the hospitality industry, expects to post earnings of 4 cents to 7 cents a share and revenue of $49 million to $50 million. Analysts project earnings of 15 cents a share and revenue of $55.7 million.

"Our anticipated results this quarter are lower than projections due to lower sales associated with software delays, both third party and our own, to our quick-serve restaurant customers," the Par said. Shares were trading down $1.61 to $7.50.

Shares of Diodes ( DIOD) slid 7% after the chipmaker lifted its third-quarter revenue guidance and announced a $200 million convertible notes offering. The company now sees sequential revenue growth of slightly better than 11.5%, up from an earlier view of 9% to 11%. Analysts project third-quarter revenue of $91.2 million, a sequential increase of about 10.3%.

As for the convertible notes offering, Diodes said it will sell $200 million in notes due 2026. The offering will include an overallotment option for the purchase of an additional $30 million in notes. Diodes will use the proceeds for working capital and general purposes. Shares were trading down $3.37 to $41.98.

Other technology movers included Microsoft ( MSFT), up 6 cents to $28; Sun Microsystems ( SUNW), down 2 cents to $4.99; Intel ( INTC), up 7 cents to $20.89; Cisco Systems ( CSCO), down 5 cents to $23.88; Sirius Satellite Radio ( SIRI), down 2 cents to $3.92; Apple Computer ( AAPL), down 43 cents to $74.95; Level 3 Communications ( LVLT), up 9 cents to $5.02; Applied Materials ( AMAT), down 2 cents to $18.07; and Oracle ( ORCL), up 2 cents to $18.19.

More from Stocks

General Electric Expulsion From Dow Symbolizes Unsettled Week in Markets

General Electric Expulsion From Dow Symbolizes Unsettled Week in Markets

How Small-Cap Stocks Can Protect Your Portfolio From a Trade War

How Small-Cap Stocks Can Protect Your Portfolio From a Trade War

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

Week Ahead: Trade Fears and Stress Tests Signal More Volatility To Come

3 Great Stock Market Sectors Millennials Should Invest In

3 Great Stock Market Sectors Millennials Should Invest In

Why Millennials Are Ditching Stocks for ETFs

Why Millennials Are Ditching Stocks for ETFs