HVAC Control in the New Millennium.pdf - HVAC.Amickracing

PC-based Control, Software and Bus TrendsTable 5-1. Automotive Control Trends————————————————————————————————• Front touch-screen LCD for car controls, e-mail, navigation system,and phone• Rear flat-panel display for Web surfing, games and movies• Seeing-eye cameras and embedded roadway transponders forsteering• Radar-based adaptive cruise control for maintaining a safe followingdistance• Smart sensors in run-flat tires eliminate spares————————————————————————————————energy as products and services are delivered on-line.Networking progress continues in wide area networks, the Internetand corporate Intranets. New developments include Internet2 and otherprojects to link industry, government and universities.One part of Internet2 is known as Abilene. It uses over 10,000 milesof fiber-optic cable and operates at a 2.4-Gbps with a growth potentialof 10-Gbps. More than 70 universities and research facilities are connectedto Abilene.The Internet Protocol (IP) version 4 was heading for a crash becauseof address saturation, but the Network Address Translation (NAT)saved it by relieving the pressure on the number of available IP addresses.IP does not tell you enough about the data it transports.The Internet needs to have greater numbering capacities for morenodes and more capacity to set priorities for different categories of data.Version 6 should provide these features for the increased loads of Internetand Intranet traffic.There has been a massive increase of digital subscriber line (DSL)connections for businesses. Cable modems will be used for additionalhome subscribers. Both techniques will run into limitations on distanceand the cost of installing new copper lines.Early in the millennium, there will be fixed-point wireless with microwavesto carry high-speed data. It will be employed in many rural areas.Cable modem, DSL and wireless will all find their application areas.©2001 by The Fairmont Press, Inc. All rights reserved.