D-Link DSL-G684T Manual de usuario descargar pdf (Pagina 9)

1.2. Wireless Network  802.11

Since the beginning wires were the main restriction of every control mechanism.

Due to this limitation human factor at specified time and place to control every wired

device, or expensive and complicated wired network is needed. But what if we were able

ing many devices spread over a large

area without necessity of additional equipment.

To achieve this goal wireless networks were created. As development of wireless

networks and wireless networking from the very beginning goes hand in hand we can say

that 

The year was 1888, Hamburg. Here German physicist named Heinrich Rudolf Herz

produced first radio wave ever. It took only 6 years to introduce radio technology to

everyday use. By the 1984 radio waves became a way of communication. Herz opened the

way for radio, television, and radar with discovery of electromagnetic waves. But the title



who expanded the radius of radio wave sending to two miles. In the next step Marconi

could send signal 9 miles across the Bristol Channel and eventually expanded the radius to

31 miles across the English Channel to France. By 1901 the communication area stopped

becoming a boundary. Marconi was able to send signals across the entire Atlantic Ocean.

The biggest step for the radio wave was the World War II when for the first time

radio data transmission was used. The United States was the first party which managed to

control sending information via radio waves. Many people believe that this application

largely contributed to the final victory. After the WWII in 1971 a group of researchers

under the lead of Norman Abramson from the University of Hawaii created the first

packet-

first official WLAN(wireless local area network) with the application of star topology

created ever. In the 1972 the connection between ALOHAnet and Arpanet on the mainland

was achieved. The length of this connect was crucial in the telecommunications between

computers.

The first types of WLAN technology used and unlicensed band (902-928 MHz),

which later became crowded with interface from small appliances and industrial

machinery. A spread spectrum was used to minimize this interference which operated at

500 kilobits per second. The second generation of WLAN technology was operating at

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D-Link DSL-G684T Manual de usuario Pagina 9