Topology: Topology means the physical layout of a network. The main four kinds of topology are given below:
• Mesh topology• Bus topology• Star topology• Ring topology
Mesh topology: In Mesh topology all computer’s are connected to each other by a LAN. It is very expensive.
Internet: Network of network is called internet.
LAN: A Local Area Network is a computer network that connects computer and devices in a limited geographical area such as home, school, computer laboratory, office building, closely positioned group of buildings or an airport.
WAN: A Wide Area Network is a computer network that covers a broad area( i.e. any network whose communication links cross metropolitan, regional or national boundaries). This is in contrast with personal area network, local area networks, campus area networks, metropolitan area networks which are usually limited to a room, building, campus or specific metropolitan area respectively.
MAN: A metropolitan area network is a large computer network that usually spans a city or a large campus. A MAN usually interconnects a number of local area networks using a high-capacity backbone technology, such as fiber-optical links and provides up-link services to wide area network and the Internet.
Full-duplex: In full-duplex operation, a connection between two devices is capable of sending data in both direction.
Example: Mobile phone.
Half-duplex: In half-duplex operation, a connection between two devices is capable of sending data in one direction.
Example: Wakitaki.
Unicast: Unicast is communication between a single sender and a single receiver over a network.
Multicast: Multicast is communication between a single sender and multiple receivers on a network.
Backbone Line: A backbone is a larger transmission line that carries data gathered from smaller lines that interconnect with it.
Network: In information technology, a network is a series of points or nodes interconnected by communication paths. Networks can interconnect with other network and contain sub networks.
Broadcast: In computing, broadcasting refers to a method of transferring a message to all recipients simultaneously. Broadcasting can be performed as a high level operation in a program.
Repeater: In digital communication systems, a repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium.
Communication Channel: In telecommunications and computer networking, a communication channel, or channel, refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel. A channel is used to convey an information signal, for example a digital bit stream, from one or several senders (or transmitters) to one or several receivers.
Communication: Passing of date or information from one place to another.
Electric Communication: Passing of data or information by electric means signal. It can be analog or digital.
Wavelength: It is the distance travelled by the wave in the time in which the particle of the medium complete one vibration.
Frequency: It is the number of vibrations made by a particle in one second.
Amplitude: It is the maximum displacement of the particle from its mean position of rest.
Phase: It is defined as the ratio of the displacement of the vibrating particle or it is defined as the fraction of the time interval that has elapsed since the particle crossed the mean position of rest in the positive direction or it is equal to the angle swept by the radius vector since the vibrating particle last crossed its mean position of rest.
Time Period: It is the time taken by a particle to complete one vibration.
Receiver: Receiver is a such kind of device which can receive data.
Transducer: Transducer converts the message into electrical signal and fed into amplifier.
Modulator: Modulator helps to send signals over long distance.
Amplifier:
Antenna: Antenna is used to spread the amplifier and modulator signal.
Noise: On the transmission path which distorted the signal is called noise.
Amplifier: An amplifier is an electronic device that increase the voltage, current or power of a signal.
Wireless medium: Some wireless medium’s are given below:
• Infrared
• Bluetooth
• Radio Frequency
• Microwave
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