Physical Layer
Q22.
If the bandwidth of a signal is 5 kHz and the lowest frequency is 52 kHz, what is the highest frequencyQ24.
By using an eight bit optical encoder the degree of resolution that can be obtained is (approximately)Q26.
What is the bit rate of a video terminal unit with 80 characters/line, 8 bits/character and horizontal sweep time of 100 \mu \mathrm{s} (including 20 \mu \mathrm{s} of retrace time)?Q27.
How many bytes of data can be sent in 15 seconds over a serial link with baud rate of 9600 in asynchronous mode with odd parity and two stop bits in the frame?Q28.
What is the maximum number of characters (7 bits + parity) that can be transmitted in a second on a 19.2 Kbps line. This asynchronous transmission requires 1 start bit and 1 stop bit.Q29.
If there are n devices (nodes) in a network, what is the number of cable links required for a fully connected mesh and a star topology respectivelyQ30.
Let us consider a statistical time division multiplexing of packets. The number of sources is 10. In a time unit, a source transmits a packet of 1000 bits. The number of sources sending data for the first 20 time units is 6, 9, 3, 7, 2, 2, 2, 3, 4, 6, 1, 10, 7, 5, 8, 3, 6, 2, 9, 5 respectively. The output capacity of multiplexer is 5000 bits per time unit. Then the average number of backlogged of packets per time unit during the given period is