Deemed University 2009 A.M.I.E.T.E Electronics

h. The kind of hand-off obtained in CDMA system is

(A) hard hand-off. (B) medium hand-off.
(C) soft hand-off. (D) None.

i. Decryption and encryption of data are the responsibility of ________ layer.

(A) Physical (B) Data link
(C) Presentation (D) Session

j. The bandwidth of an optical fiber is

(A) 1300-1550 nm. (B) 1300-1550 .
(C) 1300-1550 mm. (D) None.


ans any 5 ques. out of 8 ques..
every ques. carries 16 marks.


Q.2 a. What do you understand by a switching system? Classify various switching systems and discuss every 1 of them, briefly. (10)

b. discuss the 2-wire and 4-wire transmission system. (6)

Q.3 a. discuss various switching network configurations in detail. (10)

b. discuss the concept Echoes and Singing. (6)

Q.4 a. explain the subsequent with reference to telecommunication traffic.
(i) Traffic characterization.
(ii) Loss systems.
(iii) Delay systems. (10)

b. Determine the implementation complexity of a 2048-channel STS switch implemented for 16 TDM links with 128 channels on every link. The desired maximum blocking probability is 0.002 for channel occupancies of 0.1. (6)

Q.5 a. elaborate the basic advantages of a cellular architecture in mobile telephony? (5)

b. discuss the structure of a GSM channel. (5)

c. What do you understand by the term CDMA? Draw and discuss the architecture of a CDMA system. (6)

Q.6 a. discuss various elements of optical fiber transmission system. (8)

b. Write a short note on line codes used in optic transmission. (6)

c. Determine the difference in wavelength of 2 optical signals separated by two GHz and centered at 1500 nm. (2)


Q.7 a. elaborate the factors responsible for the developments towards ISDN? (4)

b. Draw the architecture of ISDN network and discuss. (6)

c. discuss briefly the various schemes of signalling used in ISDN systems. (6)

Q.8 Write short note on the following:

(i) Circuit switching.
(ii) ISO-OSI reference model
(iii) LAN, MAN and WAN.
(iv) ATM networks (4 four = 16)

Q.9 a. define the advantages and disadvantages of optic fibre used as a transmission medium. Also define its different applications. (8)

b. A subscriber makes 3 phone calls of 3 minutes, 4 minutes and 2 minutes duration in a 1 hour period. compute the subscriber traffic in Erlangs, CCS and CM. (6)

c. discuss VPCs and VCCs supported by ATM. (2)

Earning:   Approval pending.