81. A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?
82. X.21 is
83. What is the minimum number of wires required for sending data over a serial communications links?
84. In cyclic redundancy checking, the divisor is _____ the CRC.
85. Which command-line tool is included with every Microsoft TCP/IP client?
86. If odd parity is used for ASCII error detection, the number of 0s per eight-bit symbol is _____.
87. An error-detecting code inserted as a field in a block of data to be transmitted is known as
88. Number of bits per symbol used in Baudot code is
89. Working of the WAN generally involves
90. What does the acronym ISDN stand for?
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