INTRODUCTION TO INTERNET PART :- 2
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COMMUNICATION CHANNEL A communication 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 in telecommunications and computer networking . 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 . A channel has a certain capacity for transmitting information, often measured by its bandwidth in Hz or its data rate in bits per second . Communicating data from one location to another requires some form of pathway or medium. These pathways, called communication channels, use two types of media : cable (twisted-pair wire, cable, and fiber-optic cable) and broadcast (microwave, satellite, radio, and infrared) . Cable or wire line media use physical wires of cables to transmit data and information. Twisted-pair wire and coaxial cables are made of