Rr321701-telecommunication-switiching-systems--and--networks

Set No. 1

Code No: RR321701

III B.Tech Supplimentary Examinations, Aug/Sep 2008 TELECOMMUNICATION SWITICHING SYSTEMS AND NETWORKS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Mention the typical centralized stored program control organization and mention various levels of controls (b) Given that MTBF = 2000 hours and MTTR = 4 hours calculate the un availability for single dual processor. [10+6] 2. (a) With the help of sketch illustrate the working of generalized time division space switch. (b) Show that Cost capacity index, CCI, is N/3 for non-folded networks with N switching elements each at input and output side with switching capacity N and Traffic handling capability, TC=1. [10+6] 3. Describe how a stochastic model is useful in modeling the behavior of a switching system? Distinguish between renewal process and pure birth process. [16] 4. Write in detail about Transmission Plan in Telephone Networks?

[16]

5. (a) What is the need for data encryption? Discuss in detail about data encryption in data networks? (b) Write about Application layer of ISO-OSI model with respect to data networks? [8+8] 6. Write in detail about Satellite Based Data Networks?

[16]

7. (a) Write about ISDN protocol architecture? (b) Explain about the transmission channels in ISDN?

[8+8]

8. (a) Write about components of an Expert System in ISDN? (b) A telephone company uses an expert system for fault registration. Describe a typical conversation between the subscriber and the expert system for the situation where the subscriber is able to dial out calls but unable to receive incoming calls? [8+8] ⋆⋆⋆⋆⋆

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Set No. 2

Code No: RR321701

III B.Tech Supplimentary Examinations, Aug/Sep 2008 TELECOMMUNICATION SWITICHING SYSTEMS AND NETWORKS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Distinguish between local battery and central battery exchanges? (b) A central battery exchange is powered with 48V battery. The carbon microphone requires a minimum of 24 mA as energizing current. The battery has a 400Ω resistance in series for short circuit protection. The d.c resistance of microphone is 50Ω. If the cable used for subscriber lines offers of 50Ω/Km, determine the maximum distance at which a subscriber station can be located. [8+8] 2. What are the different configurations of combinational switches? Explain the working of 2- stage TS switch. [16] 3. (a) Define Traffic Intensity? Distinguish between erlang (E), centum call second (CCS) , call minutes (CM). (b) A subscriber makes three phone calls of three minutes, four minutes and six Minutes in a one-hour period. Calculate the subscriber traffic in erlang, CCS and CM. [8+8] 4. (a) What is known as subscriber loop interface in Telephone networks? Write in detail about it? (b) What is Equalization? Write in detail about Coaxial cable amplitude equalizers in Telephone networks? [8+8] 5. What are the functions of a Network layer in data networks? Explain the classification of routing algorithms? List out the measures used in assessing the performance of a routing algorithm. Explain some widely used algorithms? [16] 6. (a) Explain about IEEE 802.5 and IEEE 802.6 in data networks? (b) Discuss Internetworking in Data Networks?

[8+8]

7. (a) What are reference points? Explain about functional groupings and ISDN reference points ? (b) Distinguish between basic rate access and primary rate access in ISDN?[8+8] 8. (a) What is Artificial Intelligence? How to justify than an AI system is truly intelligent. Give some examples of Expert systems and their application areas in ISDN? (b) Explain in detail about the knowledge representation techniques to design an expert system in ISDN? [8+8] 1 of 2

Set No. 2

Code No: RR321701 ⋆⋆⋆⋆⋆

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Set No. 3

Code No: RR321701

III B.Tech Supplimentary Examinations, Aug/Sep 2008 TELECOMMUNICATION SWITICHING SYSTEMS AND NETWORKS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. A 1000-line exchange is partly folded and partly nonfolded. Forty percent of the subscribers are active during peak hour. If the ratio of local to external traffic is 4:1,estimate the number of trunk lines required. [16] 2. What are the various ways of managing the control memory? With the help of sketch show how the list management implemented. [16] 3. (a) Define Traffic Intensity? Distinguish between erlang (E), centum call second (CCS) , call minutes (CM). (b) A subscriber makes three phone calls of three minutes, four minutes and six Minutes in a one-hour period. Calculate the subscriber traffic in erlang, CCS and CM. [8+8] 4. Discuss about the signaling techniques in a Telecommunication Network?

[16]

5. Explain the data link frame structure? Explain different types of frames. Discuss in detail the ARQ protocols used for transmission and retransmission in data networks? [16] 6. Write in detail about the three combinations of access techniques and topologies popularly used in LANs? [16] 7. (a) Explain about the typical configuration of an electronic mail system and X.400 in the context of OSI model in ISDN? (b) Explain the two compression techniques in facsimile transmission standardized by CCITT in ISDN? [8+8] 8. (a) Explain about ISDN− Bearer services? (b) Write about coexistence of ISDN with other networks? ⋆⋆⋆⋆⋆

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[10+6]

Set No. 4

Code No: RR321701

III B.Tech Supplimentary Examinations, Aug/Sep 2008 TELECOMMUNICATION SWITICHING SYSTEMS AND NETWORKS (Electronics & Telematics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Distinguish between local battery and central battery exchanges? (b) A central battery exchange is powered with 48V battery. The carbon microphone requires a minimum of 24 mA as energizing current. The battery has a 400Ω resistance in series for short circuit protection. The d.c resistance of microphone is 50Ω. If the cable used for subscriber lines offers of 50Ω/Km, determine the maximum distance at which a subscriber station can be located. [8+8] 2. Describe the principle of Time division space switching (PAM). Distinguish the simultaneous conversion in input controlled time division space switch and output controlled space switch. [16] 3. (a) Define Traffic Intensity? Distinguish between erlang (E), centum call second (CCS) , call minutes (CM). (b) A subscriber makes three phone calls of three minutes, four minutes and six Minutes in a one-hour period. Calculate the subscriber traffic in erlang, CCS and CM. [8+8] 4. Explain in detail about Cellular Mobile Telephony?

[16]

5. (a) What is the need for data encryption? Discuss in detail about data encryption in data networks? (b) Write about Application layer of ISO-OSI model with respect to data networks? [8+8] 6. Write in detail about Fiber Optic Networks in data networks?

[16]

7. (a) Explain about the typical configuration of an electronic mail system and X.400 in the context of OSI model in ISDN? (b) Explain the two compression techniques in facsimile transmission standardized by CCITT in ISDN? [8+8] 8. (a) Justify the selection of voice and data traffic for integration studies. List out the differences between the voice and data traffic in ISDN? (b) Explain the interworking of ISDN with other networks? ⋆⋆⋆⋆⋆

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[8+8]