What is WiMAX?
WiMax is a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless "metropolitan area networks". WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 - 10 miles (5 - 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 - 300 feet (30 - 100m).
With WiMAX, WiFi-like data rates are easily supported, but the issue of interference is lessened. WiMAX operates on both licensed and non-licensed frequencies, providing a regulated environment and viable economic model for wireless carriers.
WiMAX can be used for wireless networking in much the same way as the more common WiFi protocol. WiMAX is a second-generation protocol that allows for more efficient bandwidth use, interference avoidance, and is intended to allow higher data rates over longer distances.
The IEEE 802.16 standard defines the technical features of the communications protocol. The WiMAX Forum offers a means of testing manufacturer's equipment for compatibility, as well as an industry group dedicated to fostering the development and commercialization of the technology.
WiMax.com provides a focal point for consumers, service providers, manufacturers, analysts, and researchers who are interested in WiMAX technology, services, and products. Soon, WiMAX will be a very well recognized term to describe wireless Internet access throughout the world.
WiMAX and other service:
gneration is 1G, the first for using cell technology that let users place their own calls and continue their conversations seamlessly as they moved from cell to cell. AMPS uses what is called FDM or frequency division multiplexing. Each phone call uses separate radio frequencies or channels. You probably had a 1G phone, but never called it that. The next generation, quick on the heels of the first, is digital cellular. One standard uses a digital version of AMPS called D-AMPS using TDMA (Time division Multiple Access). A competing system also emerged using CDMA or Code Division Multiple Access. As you might suspect, the two are incompatible but you can have a phone that works with both. Europe embraced yet a third standard called GSM which is based on TDMA. Digital transmissions allow for more phone conversations in the same amount of spectrum. They also lay the groundwork for services beyond simple voice telephone calls. Data services such as Internet access, text messaging, sharing pictures and video are inherently digital. This is where the whole "G" thing got started. The original analog and digital cellular services were invented to cut the wire on landline phone service and give you regular telephone service you could take with you. As such, the bandwidth they offer for adding data services is pretty meager, in the low Kbps region. Now that a cell phone is not merely a cell phone, but also a PDA, a messaging system, a camera, an Internet browser, an email reader and soon to be a television set, true broadband data speeds are needed. That new generation of cell phone service has been dubbed 3G for 3rd generation. 3G has proven to be a tough generation to launch. The demand for greater bandwidth right now has spawned intermediate generations called 2.5G and even 2.75G. One such standard is GPRS (General Packet Radio Services) which is an extension of the GSM digital cellular service popular in Europe. It offers download speeds up to 144 Kbps. 3G phones and services are just starting to come into their own. One service you'll find is called EVDO which stands for EVolution Data Only. EVDO has download speeds up to 2.4 Mbps, which is faster than T1, DSL or Cable broadband service. There is also an evolution that includes voice called EVDV which is in the works. While 3G is going to enable telephones to also become Internet computers, video phones and television receivers, its maturity phase will find it...
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