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COMMUNICATION CHANNELS:
A wire pair connecting two telephones is the simplest circuit, allowing communication in both directions. Other channels include coaxial cables, optical fibres, satellites, a light beam, microwaves, and others. Whatever the physical medium over or through which message travels, transmission may take place in a number of different modes. They are :
Simplex Half-duplex and Full-duplex. Simplex In this type of channel, the message travels in only one direction, that is from point A to point B but not back again.
Half-Duplex: Transmission can take place in either direction, but not at the same time. In other words, message can be transmitted either from A to B or by B to A one at a time.
Full-Duplex: In this type of arrangement messages can be transmitted and received over the same channel at the same time. Many librarians and information scientists are familiar with the latter two types because database search terminals must be set to transmit full or half duplex in order to communicate with database vendors' computers.
Classification of Computers DIGITAL, ANALOG AND HYBRID Computers are of three basic types – Digital, Analog, and Hybrid. Current use of the word “computer” almost a
#queA register is a memory location surrounded by the CPU itself, designed to be rapidly accessed for purposes of fast data retrieval. Processors normally hold a register array, wh
Cache memory: To reduce the idle time of the CPU and increase the speed of processing, a fast memory can be used. This can be done by using a large size of main memory. But th
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Control Unit of the processor: The Control Unit of the processor is that unit which controls and coordinates the execution of instructions by the processor. It is responsibl
TELECOMMUNICATIONS STANDARDS: They are defined internationally by the CCITT (Consultative Committee for International Telegraphy and Telephones), but to deal with the rapidly
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Analog Transmission: In analog transmission, there is a continuous up and down pattern. For example, one wave constitutes one cycle, which is measured in the unit called Hertz
In view of the fact that processes frequently need to communicate with other processes therefore, there is require for a well-structured interaction, devoid of using interrupts, a
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