WiMax is a wireless digital communications system.
WiMax can provide BWA (Broadband Wireless Access) up to the 30 miles, means 50 km, for fixed stations, and 3-10 miles, means 5-15 km, for mobile stations.
WiMax requires a tower called WiMax Base Station similar to a cell phone tower, which is connected to the Internet using a standard wired high-speed connection. But as opposed to a traditional ISP (Internet Service Provider), which divides that bandwidth among the customers via wire, it uses a microwave link to establish a connection. In other words, WiMax doest not depend on cables to connect each endpoint, the Internet connectivity to an end-user is provided through microwave link between the tower and the user-endpoint, known as WiMax Subscriber unit.
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