Page 18 - KEC Khaitan C8.5 Flipbook
P. 18

Coaxial Cable: It contains  a  central  conductor
                    surrounded by an insulator and a shield. It is used
                    to  connects  satellite  dishes  to  TV  receivers  and
                    to  connect  cable  modems  to  the  internet  service
                    provider.

                     Fiber Optic Cable: It uses glass or plastic fibers to
                    transmit light pulses. It is used to provide very fast
                    internet connections.

                  UNGUIDED TRANSMISSION MEDIA
                  The unguided transmission media are categorised into two types: long distance wireless and

                  short distance wireless media.

                  Long Distance Wireless Media
                  It can support communication over longer distances up to thousands of kilometres. Long distance
                  wireless communication media includes microwaves, radio waves, and satellites.

                     Microwaves: It refers to microwave radio transmission which is commonly used to send signals
                    from the earth to the satellites and vice-versa. These wavers are also used for deep space
                    communications, radar systems, radio astronomy, etc.
                     Radio waves: These waves are commonly used for long distance communication or sending
                    messages, information for communication for aircraft or naval communication. The information

                    is sent in the form of electromagnetic waves.


                  Short Distance Wireless Media
                  Short distance wireless communication media includes Wi-Fi, Bluetooth, and satellites.
                     Wi-Fi: It stands for Wireless Fidelity, which lets you connect to the Internet without any wired

                    connection from your PC. It is a popular form of wireless connection as it does not require
                    cables.
                     It  can  be  used  to  get  connected  through  a  variety  of

                    devices like laptops, digital cameras, smartphones, gaming
                    consoles, etc. To connect to a Wi-Fi network a hotspot is
                    required. The hotspot acts as a gateway to the Internet, you

                    need to connect to hot-spot to be able to connect to the
                    Internet.

                                                               Bluetooth: This wireless technology creates a small wireless

                                                          network called Personal Area Network between personal
                                                          computers and peripheral devices such as printers, mouse,
                                                          keyboards, headphones, etc. It is used to exchange data
                                                          over a short distance from fixed or mobile devices.




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