CS601 Current Midterm Paper Fall 2013 File 1

CS601 Solved Current Paper

Q)) define Null Modem?
Answer:A null modem cable allows you to connect your PC to another nearby PC or serial device using its modem protocol. A popular use of null modem cables is for setting up "head-to-head" gaming between two players at different computers in the same room. (A null modem cable is limited to 30 feet in length.)
Q))What is the Band width of Fm?
Answer: 88 MHz-108MHz
Q))NRZ and RZ which require more band width
Aswer:RZ using twice the bandwidth to achieve the same data-rate as compared to NRZ format.
Q)) How to calculate Bit rate and Baund rate?
Answer))
(((Bit Rate)))
The speed of the data is expressed in bits per second (bits/s or bps). The data rate R is a function of the duration of the bit or bit time (TB)
R=1/TB
(((Baund rate)))
Baud rate refers to the number of signal or symbol changes that occur per second. A symbol is one of several voltage, frequency, or phase changes.
R = baud rate x log2S = baud rate x 3.32 log10S