This document outlines the contents and structure of an examination for the subject of Internet Engineering. It is divided into two parts - Part A and Part B. Part A covers topics related to communication protocols including SMTP, TCP/IP protocol suite, DNS servers, FSM specifications for RSVP and QA protocols, SDL specifications for ABP and QA protocols, protocol validation, and conformance testing. Part B covers testing of protocols including types of testing, SDL based performance testing of TCP, interoperability testing of CSMA/CD and CSMA/CA using a bridge, conformance testing architecture, testing architecture for video and audio synchronization, protocol synthesis using an interactive synthesis algorithm, and protocol re-synthesis. The document

1. USN
Eighth Semester B.E.
Digital
Time: 3 hrs.
10EC82
20ts
Max. Marks:100
(10 Marks)
(06 Marks)
(04 Marks)
switching system.
(10 Nlarks)
activation, feature
(10 Marks)
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PART-A
I a. With a neat diagram of a four wire circuit connected to two wire circuit through a hybrid
transformer and equation for line attenuation, explain singing and two types of echo's.
b. calculate the total bit rate for a 30 channel pcM system and draw figure a, rn.
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all the details included. AIso show calculations for ihe frame length. (10 Marks)
a. Differentiate between circuit switching and message switching. (06 trarks)
b. With a neat block diagram, explain subscribers line interface circuit for a digital switch.
(07 Marks)
c. With the help of a neat diagram, explain the intra LM call and inter LM call processing.
(07 Marks)
3 a. Derive an expression for the second Erlang's distribution starting from basic principles.
b. Calculate Ez,x (A) from Er,N (A).
c. A group of 20 trunks provide a GOS of 0.01 when offered l2E traffic.
i) How much GOS is improved if one extra is added to the group?
ii) How much does the GOS deteriorate if one trunk is out of service?
Design a progressive grading system connecting 20 outgoing trunks and havilg switches
with availability of 10. Draw the grading diagram. (10 Marks)
Design a three-stage network for 100 incoming trunks to 400 outgoing trunks. l)raw the
diagram. (10 Marks)
PART _ B
5 a. With a neat diagram, explain the operation of a time switch and discuss its limitations. Also
illustrate how a S-T or T-S switch overcome these limitations. (12 IVIarks)
b. Explain synchrontzation and frame alignment of PCM signals in digital exchange.
(08 Marks)
6 a. With neat diagram explain level 1, level 2 and level 3 control of a digital
b. What are feature flow diagram? Draw feature flow diagram for feature
operation and feature deactivation for a call forwarding feature.
7 a. With a neat block diagram, explain organizational interfaces of a digital
central office.
b.
b. Explain system outage and its impact on digital switching system reliability.
a. Explain the three level scheme of recovery strategy in a digital switch.
b. write the common characteristics of digital switching system.
c. Explain with aneat diagram, a generic switch hardware and software architecture.
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2. USN 10EC82
Eighth Semester B.E. 20ts
Tirne: 3 hrs.
Digital Switching System
Note: Answer any FIVE full questions, selecting
atleast TWO questions from each part.
PART- A
I a. With a neat diagram of a four wire circuit connected to two wire circuit through a hybrid
transformer and equation for line attenuation, explain singing and two tpes of echo's.
b. Calculate the total bit rate for a 30 channel PCM system and draw figure for the JlLTTir?
all the details included. Also show calculations for the frame length. (10 Marks)
a. Differentiate between circuit switching and message switchiag. (06 Marks)
b. With aneat block diagram, explain subscribers line interface circuit for a digital switch.
(07 Marks)
c. With the help of a neat diagram, explain the intra LM call and inter LM call processing.
(07 Marks)
3 a. Derive an expression for the second Erlang's distribution starting from basic
b. Calculate Ez,x (A) from Er,x (A).
c. A group of 20 trunks provide a GOS of 0.01 when offered l2F,traffic.
i) How much GOS is improved if one extra is added to the group?
ii) How much does the GOS deteriorate if one trunk is out of service?
Design a progressive grading system connecting 20 outgoing trunks and having switches
with availability of 10. Draw the grading diagram. (10 Marks)
Design a three-stage network for 100 incoming trunks to 400 outgoing trunks. Draw the
diagram. (10 Marks)
PART _ B
With a neilt diagram, explain the operation of a time switch and discuss its limitations. AIso
illustrate how a S-T or T-S switch overcome these limitations. (12 Marks)
Explain synchronrzattonand frame alignment of PCM signals in digital exchange.
(08 Marks)
6 a. With neat diagram explain level 1, level 2 and level 3 control of a digital switching system.
(10 Marks)
b. What are feature flow diagram? Draw feature flow diagram for feature activation, feature
operation and feature deactivation for a call forwarding feature. (10 Marks)
7 a. With a neat block diagram, explain organizational interfaces of a digital
central office.
switching system
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b. Explain system outage and its impact on digital switching system reliability.
8 a. Explain the three level scheme of recovery strategy in a digital switch.
b. Write the common characteristics of digital switching system.
c. Explain with aneat diagram, a generic switch hardware and software architecture.
Max. Marks:100
principles.
(10 Marks)
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(08 Marks)
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3. USN 10EC843
Eighth Semester B.E. Degree Examination, June/July 2015
GSM
Time: 3 hrs. Max. Marks:10Or
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! c. With a neat diagram, explain the mapping of GSM onto OSI layers.6( )
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g! 2 a. Explain the future techniques to rcduce interference in GslvL ".'; (10 Marks)
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b. What are the various bursb used in GSM? Explain with tffip ofdiagrams. (10 Marts)
f,f@.38 3 a. With relevant diagrarns, explain tlre data encrypl4grjn GSf4. (06 Marks)
H ; b. Explain the mobile identifcation process with t{gtrow diagram. (06 Marks)
I ; c. Explain the frame structur€ of GSM for bott{H{ffic and control channels. (08 Marks)
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4 a. What are vocoders?? Explain tnp@/e of n ll ratc vocodcr with relevant diagrami.r"*,
E I b. List the speech coding metho$enY exnlain the atributes of speech coder. (t0 Mrrks)
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5E 5 a. ExplaintheGSl(@PsetupbyMSflowscenario. (loMrrk)
E : b. What are thqg"Qf,ty Ago;ith;* used in GSM? Explain them briefly. (r0 Marks)
$.$ u ". r-u,ffiatdiagram,thefitestructr.rreofSrMcard. (06Mrrrrs)
E € b. lp@the token based registation with relevant diagrams. (0s Ma*0
E E c. .'tGflV exOlain SMS with relevant figure. (06 Marks)
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€s .'t E -$ a. Explain the planning of wireless network. (06 Marks)
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b. What are the frctors to be considered while designing a wireless system? (0E Mert<s)
.Sqg c . Write short notes on specfral efficiency of a wireless system. (06 Merks)
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c. Write short notes on specfral efficiency of a wireless system. (06 Merks)
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E t Write short notes on :
f; a. Teleraffic models
E b. NM architecture and interface
E c. Management requirements for wireless netwotk
d. TMN management services. (20 Marks)
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4. USN
Eighth
Time: 3 hrs.
lnternet Engineering
Note: Answer FIVE full questions, selecting
at leost TWO questions from each purt.
10EC835
2015
Max. Marks:100
(06 Marks)
(06 Marks)
(08 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
(08 Marks)
(12 Marks)
(04 Marks)
by using Global System
(08 Marks)
architecture and discuss
(08 Marks)
(06 Marks)
(06 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
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PART - A
a. What is a communication protocol? Explain with a flow chart, simple message transfer
protocol (SMTP) (06 Marks)
b. Briefly explain formal method of protocol development using FDT. (06 Marks)
c. Give the TCP/IP protocol suite and explain briefly the function of each layer. (08 Marks)
2a.
b.
c.
What is a DNS server? Explain its working.
Draw the FSM of senter entity specification and explain briefly each of them.
Give the FSMS of RSVP specifications at host level and Router level.
a. Explain the safety and liveness orooffirotocol.
b. Veri$r the ABP protocol for its safety and liveness properties
States.
4a.
b.
a. Give the components of a communication system structure
about each component.
in SDL giving brief description
b. Explain the predefined datatypes used in SDL giving two examples for each.
c. Give the salient features of SDL.
Explain SDL specifications of QA protocol.
Give the SDL specifications of all the components of an ABP protocol.
c. Define protocol validation. What are protocol design errors? Explain them briefly with the
help of a two process cofirmunication system. (0g Marks)
a. What is conformance testing? Draw a conceptual conformance test
each component involved in it.
a. What are the different types of testings to be carried out for a protocol before implementing
into the system? Also mention the perforrnance parameters of a protocol. (06 Marks)
b. Explain SDL based performance testing of TCp. (06 Marks)
c. What is interoperability testing? Explain with a MSC, SDL based interoperability testing of
csMA/cD and csMA/cA protocol using bridge. (08 Marks)
b. Describe the method of conformance testing using "distributed test architecture".
c. Explain testing architecture for video and audio synchronization.
What is protocol synthesis? Explain with an example.
Explain interactive synthesis algorithm, by mentioning different steps.
Write a brief note on protocol re-synthesis.
8a.
b.
c.
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