Since the inception of Communication, there have been two ways of Communication. Wired and Wireless.
We humans also interact in these 2 forms. When we speak and interact, it is wireless communication, and when we shake hands and hug, it’s a wired communication.
Same is the scenario in Network Communication and today we will discuss both forms of Communications.
i) Wired Communication
Wired Communication is the secure transmission of audio and visual data using cables. Cable televisions, internet access from desktop computers and local telephone, are common examples of wired communication technology. Fibre Optics Communication uses optical fibres for transmitting clear signals over long distances. It is made of glass that transmits data as light waves. Coaxial cable has an inner conductor (aluminium or copper wire) surrounded by a flexible insulating layer which is surrounded by a conductive sheath. It is used as a transmission line for radio signals. Twisted pair consists of twisted copper wires and is the most widely used medium for transmission. Waveguide used for transmission of the high power electromagnetic signal is also considered a wired line.
Telephone service providers often use the same wire for providing internet connection and telephone services. This requires the use of a splitter, which is a filtering device and splits the signal for providing both the services using a single higher capacity outlet wire.
ii) Wireless Communication
Wireless communication transmits information over a long distance without the use of wires. It uses radio waves, electromagnetic waves, light waves and sound waves. It is cheaper option to gain internet access from anywhere, even in remote locations. Satellite communication uses microwaves to communicate along with orbit based transmitters and receivers. There is terrestrial microwave system for communicating over long distance using earth based transmitters and receivers. Optical communication uses line-of-sight method for transmitting information using light waves. Cellular networks use radio technologies.
Bluetooth is a wireless technology standard that describes specifications for transferring data among fixed and mobile devices in a short distance creating Adhoc networks. Bluetooth enabled devices can connect up to seven devices simultaneously, however 3-4 is a practical number. It uses the globally available frequency band of 2.45 GHz and can operate in a maximum range of 10 metres(for class 2) and up to 100 metres (for class 1)with speeds up to 2 Mbps. It is a low cost, robust technology and consumes the low power of 2.5 mW.
Wi-Fi is a popular wireless technology based on IEEE 802.11 standards and uses the frequency of 2.4 GHz or 5 GHz. Each Wi-Fi enabled devices has a network card to block and broadcast radio waves. The router is connected to the wired network and converts the binary data into radio waves for transmission through air. The network adapter blocks specifically tune radio waves and convert these radio signals to binary data. It can operate indoor offering range up to 20 metres and greater outdoor range. Encryption protocols such as WPA and WPA2 secure the connection from illegal intruders. It allows direct communication between computers, digital cameras, mobiles and for internet access. Wi-Fi Direct is a secure method for file transfer.
Infrared wireless communication uses Infrared having a wavelength longer than red light. For IR communication, it uses the Line-of-Sight mode that means there should be no obstruction between LED transmitter and Photo-sensitive receiver. Laptop, mobile and television support this wireless communication.
Wireless communication allows flexibility to work from anywhere within the range. It is cheaper and easy to install. In the case of wired communication, a lot of planning is required for placing the wires and avoid obstructions. Wireless trans-receivers can be placed anywhere according to convenience. Although wireless communication has become more popular in recent years, still wired communication can’t be wiped out in the near future as they provide the most stable communication mode and superior speed compared to some form of wireless communication.
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