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MLR Institute of TechnologyLaxma Reddy Avenue, Dundigal, Quthbullapur (M), Hyderabad – 500 043

Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit – I)

Subject: DCCNBranch: ITAcademic Year: 2014-15 Semester: IFaculty: K.ARCHANA

Question Number Previous Questions Date

Conducted

1For an electric device operating at 170 C with a bandwidth of 10 kHz, determine the thermal Noise power in watts and dBm.

2For a ckt with a signal power of 10 W and a thermal noise power of 0.01W, determine the signal-to-noise power ratio.

3

DetermineI. The peak frequency deviation Minimum

bandwidth II. Buad for a binary FSK signal with a mark

frequency of 49 kHz, a space frequency of 51 kHz , and input bit rate 2kbps

4 What are the key elements of a protocol? List out various standard organization that develop protocol standards.

5 Explain the uses of a computer network?

MLR Institute of Technology

Laxma Reddy Avenue, Dundigal, Quthbullapur (M), Hyderabad – 500 043Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –II)


Question

NumberDate Previous Questions Date

Conducted

1Determine the characteristics of impedance for an air dielectric two-wire parallel transmission line with a D/r ratio of 12.22

2Determine the characteristic of impedance for a coaxial cable with the following specifications:D=0.025 in, D=0.15 in, and €r= 2.223

3

For a given length of coaxial cable with distributed capacitance C=96.6 pF/m and distributed inductance L=241.56 nH/m, and Dielectric constant €r= 2.3 , determine the a. Velocity of propagation.b. Velocity factor

4 Distinguish between Synchronous and Statistical TDM

5 Briefly explain the characteristics of Guided media.


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –III)


Question

NumberPrevious Questions Date

Conducted

1.

1. For a PCM system with the following parameters, determine a. Minimum sampling rateb. Minimum number of bitsc. Resolutiond. Quantization error

2.2. For a single channel PCM system with a

sample rate Fs=6000 samples per second and a 7-bit compressed PCM code, determine Line Speed.

3.3. For a 20-channel PCM/TDM system with an

8 KHz sample rate, 10 bits per sample, and one framing bit per frame determine Line speed.

4. Explain function and frame formats of MAC and physical layers of IEEE 802.11

5. Explain the concept of Selective Repeat ARQ protocol with a suitable example


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions

(Unit –IV) Subject: DCCNBranch: ITAcademic Year: 2014-15 Semester: IFaculty: K.ARCHANA

Question

NumberPrevious Questions

Date Conducte

d

1For an isotropic radiator emitting 10W of power, determine the power density 1000 meters from the source.

2 Determine the wave attenuation b/w two points with power density of p1=10µW/m2 and p2=0.1W/m2

3 Determine the path loss for frequency of 6 GHz, travelling a distance of 50 km

4 Define FDMA,TDMA and CDMA, and what are the difference among FDMA,TDMA and CDMA ?

5


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –V)

Subject: DCCNBranch: ITAcademic Year: 2014-15 Semester: I

Faculty: K.ARCHANA

Question

NumberPrevious Question Date

Conducted

11. Explain the operation of a telephone set with

the help of block diagram (Nov-2010)

2

2. Interpret the following Hex code for a caller ID message04 12 31 31 32 37 31 35 35 37 33 31 35 37 33 36 31 30 35 33 xx

3

3. Determine a. The power levels in dBm for signal levels of

10mW and 0.5 mWb. The difference between the two power levels

in dB.

4Explain with an example Distance Vector routing Algorithm.

5 Name the ATM layers and list their functions.


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –VI)


Question

NumberPrevious Question Date

Conducted

1.Determine the transmit and receive carrier frequencies for a. AMPS channel 3b. AMPS channel 991

2.Determine the transmit power for a CDMA mobile unit that is receiving a signal from the base station at – 100 dBm

3.Explain about GSM architecture with neat Diagram

4. Explain the Integrated Services QoS model

5. What is NAT? How can NAT help in IPv4 address depletion?


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –VII)


Question

NumberDate Previous Questions Date

conducted

1Compute check characters for the code 39 message * C O D E space 3 9 *

2Determine the single –precision checksum for the following 5 character ASCII message. H E L L O

3Determine the honey well check sum for the following four character ASCII message H E L P

4

5 Explain the flow control mechanism used in TCP.


Phone Nos: 08418 – 204066 / 204088, Fax : 08418 – 204088

Previous Questions (Unit –VIII)


Question

NumberPrevious Question

Date conducte

d

1

Determine the character sequence for the following:a. General poll of station 8b. Specific poll of device 10 at station 6

2 Determine the character sequence for BSC selection of device 22 at station 18

3

Determine the bit pattern for the control field of an information frame sent from the primary to secondary station for the following conditions:Primary is sending information frame 3(ns=3)Primary is polling the secondary(p=1)Primary is confirming correct reception of frames 2,3 and 4 from the secondary(nr=5)

4 Write a brief note on

i. Web documents ii. Audio & Video Compare.

5Write a brief note on

i. Network Management System. ii. Streaming Live Audio / Video.

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