Shares of

PLX Technology

(PLXT)

were among technology's losers Wednesday, falling 9% after the supplier of semiconductor devices posted first-quarter results that fell short of expectations and warned that second-quarter sales would fall below expectations.

The company posted pro forma earnings of $70,000, or break even, on sales of $13.2 million. Analysts surveyed by Thomson First Call were expecting earnings of 1 cent a share on sales of $14 million. A year ago the company earned $600,000, or 2 cents a share, on sales of $11.6 million. Looking ahead, PLX forecast second-quarter sales of $13.2 million to $14.2 million. Analysts are expecting sales of $15.1 million and earnings of 2 cents a share. Shares were trading down 94 cents to $9.41.

Radvision

( RVSN) rose 16% after the company posted first-quarter earnings and sales above expectations and said second-quarter results would top expectations as well. The company earned $2.5 million, or 11 cents a share, on sales of $16.3 million. Analysts were expecting earnings of 4 cents a share on sales of $16 million. The company's technology business unit showed 36% growth on a year-over-year basis, while its networking business segment rose by 5%. Looking ahead, Radvision forecast second-quarter earnings of $2.7 million, or 12 cents a share, on sales of $18 million. During last year's second quarter, the company earned $1.1 million, or 5 cents a share, on sales of $15.7 million. Analysts are expecting earnings of 8 cents a share on sales of $17.6 million. Shares were trading up $1.71 to $12.20.

Shares of

Tellabs

( TLAB) rose 10% after the company posted first-quarter earnings that topped expectations. Excluding items, the telecom gearmaker earned $26.2 million, or 6 cents a share, on sales of $435.6 million. Analysts were expecting earnings of 2 cents a share on sales of $408.4 million. A year ago the company earned $25.4 million, or 6 cents a share, on sales of $263.8 million. Shares were trading up 70 cents to $7.76.

RealNetworks

(RNWK) - Get Report

rose 4% after the company previewed first-quarter sales that are above current Wall Street estimates. The maker of digital media services and software said that it expects to post sales of $76.6 million when it issues first-quarter results on May 4. Previously, the company said that it would post sales of $73 million to $74.5 million. Analysts had been expecting sales of $74 million. During last year's first quarter the company posted sales of $60.4 million. Shares were trading up 24 cents to $6.03.

Shares of

Avaya

(AV)

fell 23% after the company posted second-quarter results that fell below expectations and warned that it would not meet several of its 2005 goals. The software maker posted earnings of $36 million, or 7 cents a share, on sales of $1.22 billion. Analysts were expecting earnings of 17 cents a share on sales of $1.29 billion. Second-quarter results include dilution of 6 cents a share, which relates to the company's acquisition of Tenovis.

Avaya said that its implementation of a new sales channel model in the U.S. (which caused disruption in U.S. sales), the impact of its Tenovis integration and early signs of potential softness in the U.S. technology market impacted its second-quarter results. Looking ahead, Avaya said that it no longer believes that it will meet its previously stated goals for sales growth, operating income and operating margin. Analysts are expecting 2005 earnings of 80 cents a share on sales of $5.15 billion. Shares were trading down $2.49 to $8.20.

Other technology movers included

Intel

(INTC) - Get Report

, up 67 cents to $23.30;

Yahoo!

(YHOO)

, up $1.68 to $34.90;

Microsoft

(MSFT) - Get Report

, down 7 cents to $24.56;

Cisco

(CSCO) - Get Report

, up 23 cents to $17.41;

Lucent Technologies

( LU), up 7 cents to $2.68;

Oracle

(ORCL) - Get Report

, up 7 cents to $11.95;

Applied Materials

(AMAT) - Get Report

, up 6 cents to $15.06;

Juniper Networks

(JNPR) - Get Report

, up $1.91 to $23.17;

eBay

(EBAY) - Get Report

, up $1.15 to $33.32;

Apple Computer

(AAPL) - Get Report

, down 1 cent to $37.08; and

Sun Microsystems

(SUNW) - Get Report

, up 2 cents to $3.58.