Jawaharlal Nehru Technological University Hyderabad 2007 M.Tech VLSI system design -Digital data communication - Question Paper

Code No: 54108/MT
M.Tech. I-Semester Examinations, February-2007.
DIGITAL DATA COMMUNICATIONS
(Embedded Systems, Digital System and Computer Electronics,
Digital Electronics and Communication Systems, VLSI System
Design and Wireless and Mobile Communication)
Time: three hours Max. Marks: 60
ans any 5 ques.
All ques. carry equal marks
- - -
1.a) Derive the expression for MSK waveform from OQPSK signal.
b) With the use of suitable block diagram, discuss how can clock
signals be recovered in the receiver.

2.a) elaborate the kinds of errors occur in digital data communication?
discuss briefly the fault detection and correction methods.
b) A receiver receives the code 11001100111. When it uses Hamming
encoding algorithm, the outcome is 0101. Which bit is in error?
What is the accurate code?

3.a) explain about different circuit switching techniques with suitable
sketches.
b) provide block diagram of hybrid fiber coaxial network and define
the important components involved in it.
c) What is SONET and elaborate the services given by the SONET?

4.a) define bisyne protocol for the transmission of data.
b) elaborate the tree frame formats used with SDLC? discuss what
every format is used for.
c) Determine the hex code for the control field in an SDLC frame for
the subsequent conditions: info frame, not a poll,
transmitting frame number five and confirming the reception of
frames 0, 1, two and 3.

5.a) Draw the block diagram of physical layer for 10 Mbps Ethernet and
explain about every element in detail.
b) What is Gigabit Ethernet? discuss different sublayers involved in
the physical layer of Gigabit Ethernet.

6.a) provide the block diagram for long hand FDM hierarchy and briefly
define the importance of every sub block in it.
b) What is combo chip? With the help of block diagram, discuss the
principle of operation of combo chip and its functionality.

7.a) What is Bluetooth? explain the kinds of networks described by
Bluetooth technology.
b) define the physical layer methods used by wireless LANs.

8. Write the following:
(a) VOIP (b) MPEG

Earning:   Approval pending.