Lesson 9 - Wireless or Unguided Media
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In wireless media data signal are free to move means they are not guided or bounded by cable and also they are not a path specific that why also known as unguided or unbounded Media.
There are two types of wireless media listed and describe below -
Long distance wireless media is a category of those medium which work on a large distance which they can communicate between the thousands of kilometers. This includes -
Like radio and television signal microwave signal are also transmitted data without the cabling system but with a different frequencies range. Here data signals are transmitted in straight path free of material obstacles that why also known as line-of-straight transmission.
When transmission is made via radio frequencies the transmission is known as radio-wave transmission.
In satellite communication the earth station consists of satellite dish. Satellite dish function as an antenna and communication equipment to transmit the signal which are later receive data from satellite passing overhead.
Communication satellite are owned by government or Private organization which are placed in stationary orbit about 22,300 miles above earth surface.
These satellite work as a relay station for data signals. Satellite accept data, amplify it, and retransmitted them to another earth station. This is a setup used to transmitted data to the other side of earth.
Short distance wireless medium supports the data transmission in as short range without any guidance or cable system.
Infrared transmission used infrared light to transmit data. You used this types of transmission in everyday life TV remote, automotive garage door, wireless speaker etc. Transmission of data is through the air and can propagate throughout a room, but can penetrate the wall.
Laser transmission is a direct line of straight but work on single direction like microwaves but have a much higher speed than microwave. It requires a laser transmitter and a photo sensitive receiver at the both end. It a point to point transmission.
Bluetooth is a medium of connection through which cellular phones, computer and PDAs (Personal Digital Assistance) are connected with each other in order to share information without the cables and any others guided media. This technology required the low cost transceiver chip on each device. The transceiver transmitted and receives data in a frequency of about 2.45 Ghz with some variation. Its help to synchronized data and information between mobile phone and computer devices.
Wi-Fi refers to the Wireless Fidelity, which help you to connect with the internet without a direct line from your PC to your ISP (Internet Service Provider). For a Wi-Fi connection you need :
Data transmission without the cable between computers makes your data susceptible to Hacker, who can steal your data by intercept your network. So be sure to use secure Wi-Fi connection.
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