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

Building Automation, Wireless Technology and the InternetThe first PDAs from Apple, Sharp, Tandy and Casio were designedas computing devices, with communications available as an option.Later devices like the Simon cellular telephone were designed as cellphones with computational functions added in. Developed by IBM, theSimon used a tap-sensitive LCD screen that you use to access built-infeatures or to dial a number. Most PDAs prefer PCMCIA interfaces.BellSouth’s Simon cellular phone uses a predictive keypad. Insteadof cramming a full set of tiny characters on the screen, it displays on apen-input screen only the characters most likely to follow the previouscharacter you entered. If it guesses incorrectly, you hit an icon to call upanother set of possibilities.Computers are getting more portable with units like Xybernault’swearable PC. It has a 233-MHz processor, 128 MB of RAM and a 4.3 GBhard drive. The 28-ounce processor units attaches to your belt and thekeyboard can be strapped to your arm. Qual Comm’s PdQ Smartphonecombines a 3 Com Palm III and a Qual Comm digital cellular phone.You can dial directly from the Palm III address book.Internet phones are another developing area. PC-based Internetphones use programs that let you talk to others on the Internet. Youneed a sound card, speakers, microphone and modem. IDT’s Net 2Phone is a program that connects your computer to a real phone.New generations of digital cellular modems will use the entirechannel for data and connect with any other modem. These modemsusing digital technology promise to be more immune to noise and tooffer higher data throughput rates.Third-generation WirelessThird-generation wireless phones will drive the convergency ofcomputing while creating a range of new wideband wireless multimediaproducts that are capable of delivering not only voice, but also videoand data-intensive information, such as real-time Internet access.QUALCOMM has been involved in next-generation mobile phonestandards which would integrate the well-entrenched Global System forMobile Communications (GSM) network with a standard known ascdmaOne, which depends on code-division multiple access (CDMA).Ericsson has been working with Japan Telecom to develop widebandCDMA (WCDMA) as an enabling technology for third-generation services.These new, emerging services may be developed for time-divi-©2001 by The Fairmont Press, Inc. All rights reserved.