Updated from 12:46 p.m. EST

Shares of Sirenza Microdevices ( SMDI) were among technology's losers Tuesday, falling 16.5% after the company warned that fourth-quarter earnings and sales would fall below Wall Street expectations.

The maker of radio frequency components now expects adjusted earnings of 4 cents a share on sales of $15 million to $15.1 million. Previously, the company expected earnings of between 4 cents and 6 cents a share and sales of $15.7 million. Analysts polled by Thomson First Call had been expecting earnings of 5 cents a share on sales of $16.2 million. Sirenza said that sales were hurt by decreased demand and "year-end inventory balancing" at some of its OEM customers. Shares traded down 92 cents to $4.65.

I.D. Systems ( IDSY) rose 9.8% after the company received a three-year, $4 million contract from the U.S. Postal Service. The contract, which has a minimum guaranteed value of $4 million, involves vehicle management at eight USPS facilities. Shares traded up $1.65 to $18.45.

Shares of Faro Technologies ( FARO) fell 1% after the company previewed fourth-quarter results that were slightly lower than expected. The maker of computer-aided design products posted fourth-quarter sales of $28.8 million, up from year-ago levels of $23 million, but slightly less than the $28.9 million that analysts' were expecting. Faro plans to issue full fourth-quarter results some time in early March. Analysts are expecting the company to post earnings of 27 cents a share. Shares traded down 17 cents to $29.38.

JDS Uniphase ( JDSU) traded actively after the company trimmed its second-quarter earnings guidance. The company now expects to post a loss of 2 cents a share, down from previous guidance that called for a loss of 1 cent a share. Sales, meanwhile, are expected to be about $180 million. Analysts had been expecting a loss of 1 cent a share on sales of $187.2 million. The quarter's results were hurt by a decline in sales from an OEM customer, which accounted for $13 million in lost sales, and by new product startup costs. Shares ended the day unchanged at $2.78 on volume of more than 51 million shares.

Shares of Video Display ( VIDE) rose 6% after the maker of video display solutions posted a 190% jump in third-quarter earnings on a 19% increase in sales. The company earned $1.08 million, or 11 cents a share, on sales of $21.4 million. A year ago the company earned 372,000, or 4 cents a share, on sales of $18.1 million. During the most recent period, one analyst polled by Thomson First Call was expecting earnings of 10 cents a share on sales of $21 million. Shares traded up 72 cents to $12.72.

Other technology movers included Sun Microsystems ( SUNW), up 23 cents to $4.45; Microsoft ( MSFT), up 20 cents to $26.32; Lucent ( LU), up 19 cents to $3.70; Intel ( INTC), down 8 cents to $22.94; Oracle ( ORCL), up 15 cents to $13.78; Cisco ( CSCO), down 14 cents to $18.74; and Sirius Satellite Radio ( SIRI), down 21 cents to $6.24.

More from Stocks

Stocks Finish Higher After Release of Fed Minutes

Stocks Finish Higher After Release of Fed Minutes

Has Wall Street Completely Lost Its Mind on General Electric?

Has Wall Street Completely Lost Its Mind on General Electric?

Did Trump Just Torpedo the Stock Market Again?

Did Trump Just Torpedo the Stock Market Again?

10 Questions for PayPal Ahead of Its Big Investor Day

10 Questions for PayPal Ahead of Its Big Investor Day

Lowe's Taps Home Depot Veteran As New CEO

Lowe's Taps Home Depot Veteran As New CEO