2G
In mobile telephony, second-generation protocols use digital encoding and include GSM, D-AMPS (TDMA) and CDMA. 2G networks are in current use around the world. These protocols support high bit rate voice and limited data communications. They offer auxiliary services such as data, fax and SMS. Most 2G protocols offer different levels of encryption.
2.5G
In mobile telephony, 2.5G protocols extend 2G systems to provide additional features such as packet-switched connection (GPRS) and enhanced data rates (HSCSD, EDGE).
3G
In mobile telephony, third-generation protocols support much higher data rates, measured in Mbps, intended for applications other than voice. 3G networks trials started in Japan in 2001. 3G networks are expected to be starting in Europe and part of Asia/Pacific by 2002, and in the US later. 3G will support bandwidth-hungry applications such as full-motion video, video-conferencing and full Internet access.

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Agricultural engineers design farm and food processing equipment, construct crop storage and livestock buildings, and develop systems for drainage, irrigation, and waste disposal. Sometimes agricultural engineers work in labs like EPCOT’s Land Pavilion, where they experiment with promising indoor farming techniques such as hydroponics-the science of growing plants in fluids without dirt.

computers, microwave ovens, IPODs, MP3s, bicycles, video games, sports equipment, aircraft, athletic shoes, wheel-chairs, sunglasses, medical devices . . . every thing you see and use must be made – manufactured. Manufacturing engineers design, plan, develop, improve, and manage the machinery, processes, and systems that produce these products. Manufacturing engineers make industries and businesses competitive and innovative. They use knowledge of products, materials, processes, assembly methods, production equipment, systems capabilities, and quality standards to ensure that the products meet customers’ expectations and are produced at reasonable cost.

engineers organize the people, information, eergy, manterials, and machines involved in the production process. They are concerned with plant design and management, quality control, and the human factors of engineering. Industrial engineers perform tasks such as finding the best location for a high-tech company’s new plant.

Metallurgical and materials engineers extract, process, refine, combine, and manufacture natural substances to create new materials that are stronger and resist corrosion. Metallurgical engineers work with metal only. Teams of metallurgy and materials engineers created the US Air Force’s “stealth” technology that makes a fighter plane’s surface nearly invisible to radar.

Nuclear engineers design, develop, and control plants that use nuclear energy for fuel and medical purposes. Some nuclear engineers are busy working on a nuclear-powered spacecraft that will travel to Mars.
MINERAL AND MINING ENGINEERING
Mineral and mining engineers locate, remove, and appraise minerals they find in the earth. Mining engineers lay out the mines, supervise their construction, create a materials transportation system, and return the area to its natural state upon mining completion. Mineral and mining engineers need to know how to mine the natural wealth underground without destroying the land above or disrupting the people that live on it.