Led by Intel, True Believers In Wi-Fi Say It Will Endure
Businesses hoping to ride Wi-Fi wave are encouraged by leadership role taken by Intel Corp, whose wireless PC chips now dominate W-Fi market; Intel is teaming with Alvarion, small Israeli company, to back free wireless standard that is intended to send data over distances of as much as 30 miles and at speeds of up to 70 megabits a second; data rate is high enough to comfortably stream high-definition television video broadcasts, and range makes it possible to quickly deploy system in large urban or suburban area, allowing businesses to deliver interactive entertainment and host of other digital products and services right into America's living rooms and dens; is putting WiFi circuitry in all of its chip sets for portable computers, investing widely in Wi-Fi industry start-ups and spending almost its entire annual marketing budget in $300 million ad campaign extolling virtues of its unwired Centrino brand; photos (M)