Anna University Model Papers – IT – Telecommunication switching techniques

MODEL PAPER

B.Tech. DEGREE EXAMINATION.

Fourth Semester

Information Technology

IF 251 — TELECOMMUNICATION SWITCHING TECHNIQUES

Time : Three hours                                                                        Maximum : 100 marks

Answer ALL questions.

PART A — (10 ´ 2 = 20 marks)

  1. What are the four fundamental functions of a switching system?
  2. What do you mean by step by step switching?
  3. Define Time Switch.
  4. Draw the schematic of a PSTN and distinguish it from ISDN.
  5. Draw the architecture of SS N07 protocol.
  6. Define grade of service.
  7. Write down the specifications of the TDM frame of a T1 carrier.
  8. What is the fundamental method for synchronising a transmitter and receiver?
  9. What are the features of a connection oriented protocol?
  10. Define Time Division Multiple Access.

PART B — (5 ´ 16 = 80 marks)

  1. With a neat diagram describe a cross bar switching system.
  2. (a)     Describe a digital switching system generic hardware.

Or

             (b)     Describe a digital switching system software.

  1. (a)     Describe the common channel signalling scheme.

Or

             (b)     Show that the telephone traffic is modelled as a poisson process.

  1. (a)     Describe FDM transmission system and crosstalk.

Or

             (b)     Describe a three stage switching network.

  1. (a)     Describe ISO–OSI reference architecture.

Or

             (b)     Describe a satellite based data network.

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