Jaypee Institute of Information Technology (JIIT) 2008 B.E Electronics & Tele-Communication Engineering Test 1 : Telecommunication Switching & Networks - Question Paper

Jaypee University of Information Technology, Waknaghat Test-1 EOF. 3^rd Year 6^,h Semester Subject: EC112 (Telecommunication switching and networks) Duration: 1 Hr    Max Marks 20

All Questions are compulsory

Ql. For 2 bit message, write 5 bit codewords with hamming distance 3 (assume one codeword as 00000). How many errors can be detected and corrected with codewords designed. If data 10100 appears at the receiver, explain the procedure to identify the codeword closest to data.    (5)

Q2.(a) Apply the bit stuffing to the data 11101111110101000111101111111011 where flag is 011110.    (2)

(b) Compare circuit switching, message switching and packet switching for redundant information, reliability and channel utilization.    (3)

Q3. Differentiate

(a)    Services provided by OSI model and TCP/IP model at network/transport layers

(b)    CSMA and CSMA/CD multiple access methods

(c)    Stop*wait and sliding window flow control mcchanism    (2,2,2) Q4. Explain near far and exposed terminal limitations of mobile/wireless LANs. How to avoid it? (4)