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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.
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Library function : These are the functions supplied with the programming language. The code or definition of library functions does not have to be written in a user program w
#questionConsider the one-time pad encryption scheme to encrypt a 1-bit message m, and assume m is chosen with uniform distribution from message space M={0,1}. Let E1 be the event
QUESTION (a) Define z-transform of sequence x[n]. (b) A causal LTI system has impulse response h[n], for which the z-transform is H(z) = (1+z -1
Synchronous and Asynchronous Transmission: Another method of setting of terminals denotes synchronous or asynchronous transmission. Many terminals can only communicate in one
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Magnetic tapes and Magnetic Disk: Magnetic tapes are very commonly used for storing large quantum of data for which rapid access is not necessary; specially for archival data
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