Telecom Switching Past Papers Important Questions

By Prof. Fazal Rehman Shamil
Last modified on March 3rd, 2022

Telecom Switching Past Papers 1

Time Allowed: 3 hours

Examination: 

Total Marks:    70, Passing Marks (35)

 

Q-1: Write a suitable answer for the following MCQs. (20)
1) TDM telecom switches are:
i- Analog ii- Digital iii- IP based
2) Which one switching system is IP based?
i- Circuit Switching ii- Packet Switching iii- both of them
3) E1 interface is used between two switches for circuit switching, what is data rate?
i- 8 Mbps ii- 16 Mbps iii- 2 Mbps iv- 1 Mbps
4) Integrated service over digital network provide two basic services.
i- PSTN ii- Digital iii- BRI and PRI
5) SPC addresses allocate for:
i- Source switch ii- Destination switch iii- Source and Destination
6) Trunk system uses interface between the sources and destination switches.
i- T1 ii- E1 iii- Fiber optic iv- all of them
7) Telecom Switching traffic unit is:
i- Hertz ii- Erlang iii- Baud
8) Which one signaling system having maximum bandwidth?
i- CAS ii- E1 iii- SS7 iv- None of them
9) Trunk layer of switching system consists of
i- Trunks ii- OPC and DPCs iii- Trunk Group iv- all of them
10) PRI support for data transmission.
i- 2-channels ii- 3-channels iii- 30-channels

Q. 2. What are telecom switching elements which causes voice/data communication. (12)
Q. 4 Explain the format of signaling system SS7 (signaling system no.7). (12)
Q. 5. PRI and BRI are basic services of ISDN, explain with implementation. (12)
Q. 6. 500 calls were offered to a trunk group and 05 calls were lost, call holding average time duration was 3.5 minutes. Find traffic intensity of successful calls. (12)

Q. 7. During the busy hour, 630 calls were offered to a Trunk Group and 15 calls were lost. The average call duration was 2.5 minutes. Find:
i. Total Traffic Intensity (14)
ii. Carried Traffic Intensity
iii. Traffic Lost
iv. Grade of Service
v. Congestion duration in seconds

Q. 8. Write short notes on any two of the following.
a) FDM and TDM
b) Frame Relay
c) Digital Switching System (12)

Telecom Switching Past Papers 2

Time Allowed: 3 hours

Examination: 

Total Marks:    70, Passing Marks (35)

 

 

Q.1. Draw and Explain Open System Interconnection (OSI) reference model in detail. (14)

Q.2. Define Multiplexing and also Explain Frequency and Time Division Multiplexing in detail. (14)

Q.3. Explain in detail the basic elements of strowger switch and it’s step by step Switching process. (14)

Q.4. Discuss the traffic performance in Local call system in detail (14)

Q.5 Briefly discuss the FDM carrier systems in detail

Q.6 Discuss the basic principle of Link Systems and Grades of several links and also explain the application
of graph theory to link systems.
. (14)
Q.7 State and Explain the control of Switching systems and call processing function in detail. (14)

Q.8. Write short notes on any TWO of the following.
(a) Queuing Systems (07)
(b) LANs and WANs (07)
(c) IDN & ISDN (07)

Telecom Switching Past Papers 3

Time Allowed: 3 hours

Examination: 

Total Marks:    70, Passing Marks (35)

 

Q.1. Discuss the Development of Telecommunications, Network Structures and Network Services in detail. (14)

Q.2. Define Multiplexing and also Explain Frequency and Time Division Multiplexing in detail. (14)
Q.3. Explain in detail the basic elements of strowger switch and it’s step by step Switching process. (14)
Q.4. Define Telecom Traffic. Explain the unit of Traffic, congestion, traffic measurement and Mathematical
modelling. (14)

Q.5 (a) What is blocking and probability of blocking?
(b)What are the two ways for handling blocked calls (14)
Q.6 Discuss the basic principle of Link Systems and Grades of several links and also explain the application of graph theory to link systems.
. (14)
Q.7 State and explain the control of Switching systems and call processing function in detail. (14)

Q.8. Write short notes on any TWO of the following.
(a) FDM Carrier systems (07)
(b) Packet Switching & Statistical Multiplexing (07)
(c) IDN & ISDN (07)

Telecom Switching Past Papers 4

Time Allowed: 3 hours

Examination: 

Total Marks:    70, Passing Marks (35)

 

Q-1: Write suitable answer with the following statements. (20)

1) Which telecom switching system has programmed data base?
i- Analog ii- Digital iii- SPC iv- ii and iii
2) OPC is the address of:
i- Source switch ii- destination switch iii- Local iv- Transit
3) Which one interface carried traffic between exchanges?
i- T1 ii- E1 iii- Fiber optic iv- ii and iii
4) Telecom Switching traffic unit is:
i- Hertz ii- Erlang iii- Baud iv- None of them
5) Which one signaling system having maximum bandwidth?
i- CAS ii- E1 iii- SS7 iv- None of them
6) Trunk layer of switching system consists of
i- Trunks ii- OPC and DPCs iii- Trunk Group iv- all of them
7) Users ports are terminated on the layer is called:
i- Control Layer ii- Physical/Access Layer iii- Application Layer
8) OPC/DPC is address of:
i- 8 bit code ii- 16 bit code iii- 32 bit code iv- 14 bit code
9) Which one switching system is IP based?
i- Circuit Switching ii- Packet Switching iii- both of them
10) E1 interface is used between two switches what is data rate?
i- 8 Mbps ii- 16 Mbps iii- 2 Mbps iv- 1 Mbps

Q. 2. Write down comparison between Crossbar and Strowger switching system. (12)

Q. 3. Explain four elements which are responsible to send voice/data from source to destination in telecom
switching system (12)

Q. 4. During the busy hour, 1200 calls were offered to a trunk group and 06 calls were lost the average call
duration was 3 minutes. Find actual traffic carried in the hour (12)

Q. 5. Briefly explain PSTN telecom switching signaling system No. SS7 (signaling system no.7)
with merits and demerits over CAS (channel associated signaling system) (12)

Q. 6. Briefly explain ISDN technology (Integrated Services Digital Network) and its Implementation in
different organization (12)

Q. 7. During the busy hour, 1000 calls were offered to a Trunk Group and 06 calls were lost.
The average call duration was 3 minutes. Find:
i- Total Traffic Intensity (14)
ii- Carried Traffic Intensity
iii- Traffic Lost
iv- Grade of Service
v- Congestion duration in seconds

Q. 8. What is Grade of Service of a telecom switch and discuss the basic parameter on which a
telecom switch is design (12)

 

Prof.Fazal Rehman Shamil (Available for Professional Discussions)
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