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LDCE Wireless > Pothi book > Flashcards

Pothi book Flashcards

1
Q

TCH/F
1) grouped in 30 multiframe
2) lasts 120 msec
3) uses 200KHz frq band
4) all the above

A

lasts 120 msec

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2
Q

?? Burst structure in GSM
1) 0.577msec duration
2) contains 156.25 bits
3) guard period of 8.25 bits
4) all the above

A

?? contains 156.25 bits

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3
Q

Role of base stations in freq hopping
1) must support freq hopping
2) decides when to use freq hopping
3) no influence on freq hopping

A

must support freq hopping

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4
Q

GSM release for GPRS

A

release 97
General Packet Radio Service

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5
Q

GPRS stands for
1) Global Packet Radio Service
2) General Packet Radio Service

A

General Packet Radio Service

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6
Q

additional services introduced in GPRS phase 2 (release 99)
1) enhanced QoS support
2) IPv6 support
3) point-to-multipoint connections
4) all the above

A

all the above

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7
Q

Role of PCU (packet control unit) in GPRS
1) routing packet switched data
2) separating circuit switched and packet switched data

A

separating circuit switched and packet switched data

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8
Q

equivalent of MSC in GPRS

A

SGSN: service GPRS Support Node

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9
Q

_____ is used to interconnect PCU (packet control unit) to GPRS core
1) ATM
2) SDH
3) Frame Relay
4) TDMA

A

Frame Relay

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10
Q

?? in GPRS phase 2, PTM stands for

A

??

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11
Q

GSM384 indicates
1) GPRS
2) EDGE

A

EDGE

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12
Q

objective of Project Vijay

A

to increase market share

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13
Q

purpose of market retailer survey in Project Vijay

A

to baseline existing retail universe and develop channel norms

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14
Q

in Project Vijay, MBO stands for

A

Multi-Brand Telecom Outlets

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15
Q

sancharsoft uses
1) PHP
2) ASP

A

ASP

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16
Q

in Sanscharsoft FMT stands for
1) Franchise Management Tool
2) Franchise Management Team

A

Franchise Management Team

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17
Q

what is the purpose of TRAU in GSM
1) to encrypt signals between BSS and MSC
2) to provide data rate control and protocol conversion for data services
3) to manage billing info
4) to handle authentication

A

to provide data rate control and protocol conversion for data services
TRAU: Transcoder/Rate Adapter Unit

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18
Q

What does HLR store permanently for a user
1) subs current location
2) subs temporary roaming number
3) subs authentication and encryption parameters
4) subs call history

A

subs authentication and encryption parameters

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19
Q

function of IWF in GSM
1) to provide internet service only
2) to interface with various data networks

A

to interface with various data networks
IWF: interworking Function

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20
Q

which contains IMEI
1) HLR
2) AUC
3) EIR
4) IWF

A

EIR

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21
Q

how many dominant interfaces in GSM
1) one
2) two
3) three
4) four

A

three

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22
Q

what does EIR store?
1) IMEI of all registered MS
2) IMEI of vising MS
3) subscriber identities
3) all of the above

A

IMEI of all registered MS

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23
Q

OMC fault management allows manual or automatic removal of network devices from service

A

T

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24
Q

purpose of extra interference margin
1) to minimize blocking rate
2) to ensure coverage quality
3) to maximize spectral efficiency
4) to enhance call success rate

A

to ensure coverage quality

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25
Q

in radio network planning, GoS Grade of Service represents
1) probability of a lost call
2) probability of successful handover
3) probability of a dropped call
4) probability of interference

A

probability of a lost call

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26
Q

in WiFi SSID stands for

A

Service Set Identifier

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27
Q

How is USSD different from SMS in terms of message delivery

A

USSD has a dialog concept, but no store&forward

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28
Q

significant advantage of WiMAX over WiFi

A

WiMAX has a range of security features including robust encryption

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29
Q

where is number portability permitted in India
1) across country
2) Internationally
3) within the same LSA
4) Within same city

A

within the same LSA
Licensed Service Area

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30
Q

the purpose of LRN (Location Routing Number) in MNP
1) Assigning unique porting codes
2) verifying subscriber eligibility
3) implementing portability
4) correct routing of calls based on operator’s location

A

correct routing of calls based on operator’s location

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31
Q

validity period of UPC in most service areas
1) 5 days
2) 15 days
3) 30 days
4) 60 days

A

15 days

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32
Q

how can a subscriber withdraw from porting request
1) sending email to MCHA
2) by informing the recipient operator in writing within 24 hrs
3) calling donor operator
4) withdrawal is not allowed after making a request

A

by informing the recipient operator in writing within 24 hrs

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33
Q

major subsystems of a power plant
1) float rectifier
2) battery charger
3) switching cubicle
4) all the above

A

all the above

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34
Q

which earth electrode is system is recommended when rock is encountered
1) spike
2) Lead strip
3) earth plate
4) all the above

A

Lead strip

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35
Q

How is the resistance of a single spike buried in ground calculated
1) e(4L/a)-1
2) L/a
3) L-a
4) e^2(L/a)

A

e(4L/a)-1

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36
Q

what is the primary condition for choosing the type of earth electrode system
1) soil resistivity
2) space availability
3) budget constraints
4) type of telecom equipment

A

space availability

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37
Q

Frequency Hopping in GSM
a) Utilizes fast frequency hopping
b) Changes frequency every TDMA frame
c) Reduces co-channel interference
d) Only supported by base stations

A

Reduces co-channel interference

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38
Q

Frequency Hopping Algorithms:”
a) Transmitted over TCH channels
b) Sent through Broadcast Control Channels
c) Utilized in BCCH channels
d) Part of the SACCH structure

A

Sent through Broadcast Control Channels

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39
Q

Role of Base Stations in Frequency Hopping
a) Must support frequency hopping
b) Decides when to use frequency hopping
c) Always uses fast frequency hopping
d) Has no influence on frequency hopping
Answer: a)

A

Must support frequency hopping

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40
Q

EDGE uses
1) GMSK
2) QPSK
3) 8PSK
4) 16PSK

A

1) GMSK
3) 8PSK

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41
Q

RAN of WCDMA consisting of NodeB and RNC is called

A

UTRAN (UMTS Terrestrial Radio Access Network)

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42
Q

which factor is considered in cost considerations for design of a quality network
1) potential cost due to improper network planning
2) redesign cost to compensate for improper design

A

potential cost due to improper network planning

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43
Q

What is an example of a technical requirement following from a license?”
a. High airtime revenues
b. Grade Of Service (GOS) below 5%
c. 50% coverage of the population in 12 months
d. Unlimited bandwidth for handling traffic

A

50% coverage of the population in 12 months

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44
Q

What are GSM-specific parameters related to
a. Daily weather conditions
b. Radio transmission and reception
c. Cable losses and antenna performance
d. Spectral efficiency

A

Radio transmission and reception

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45
Q

what is the role of community phones in the coverage quality table
a. Illustrating in-car coverage probabilities
b. Providing supplementary coverage for highways or remote areas
c. Measuring spectral efficiency
d. Representing indoor coverage areas

A

Providing supplementary coverage for highways or
remote areas

46
Q

What does the 95% probability mean in coverage type definitions for
a. Probability of blocking in the busiest hour
b. Probability of successful handover
c. Probability of coverage averaged across the cell area
d. Probability of achieving Grade Of Service (GOS)

A

Probability of coverage averaged across the cell area

47
Q

How is blocking rate defined in the context of radio network planning?
a. Probability of a lost call
b. Probability of successful handover
c. Probability that a call cannot be handled due to resource unavailability
d. Probability of a dropped call

A

Probability that a call cannot be handled due to resource unavailability

48
Q

Which service is NOT offered under Project 1 of MB-II?
a. Layer 3 MPLS VPN Services
b. Internet Access services
c. Frame relay over MPLS
d. Narrowband Remote Access Server

A

Narrowband Remote Access Server

49
Q

What is the main function of the Layer-2 Edge network in Project1 of NIB-II?
a. Enforcing QoS policies
b. Providing customer access
c. Forwarding high-speed packets
d. Supporting MPLS edge functionality

A

Enforcing QoS policies

50
Q

What services are offered under project-1 of MPLS-based IP network
1) only layer-2 MPLS VPN services
2) only layer-3 MPLS VPN services
3) both layer-2 and layer-3 MPLS VPN services

A

both layer-2 and layer-3 MPLS VPN services

51
Q

In Virtual Private Networks (VPNs), what is the purpose of the Provider Edge (PE) router?
a. Performing Layer 3 functions for CE devices
b. Providing Layer 2 services between CE devices
c. Enforcing QoS and administrative policies
d. Assigning labels to IP packets

A

Performing Layer 3 functions for CE devices

52
Q

Which model of VPN involves direct IP routing between Customer Edge (CE) devices?
a. Overlay VPN Model
b. Peer VPN Model
c. MPLS VPN Model
d. LSP VPN Model

A

Overlay VPN Model

53
Q

What is the revenue-sharing ratio Between BSNL and SaaS providers
a) 20:50
b) 30:70
c) 40:60
d) 50:50

A

40:60

54
Q

What is the revenue-sharing arrangement for partners using co-location facilities for cloud services
a) 15% of billed revenue
b) 20% of billed revenue in the first year, 25% subsequently
c) 25% of billed revenue in the first year, 35% subsequently
d) 30% of billed revenue

A

25% of billed revenue in the first year, 35% subsequently

55
Q

What is the business model for Satellite Business?
a) BSNL invests capital, and SBP provides satellite resources
b) BSNL and SBP jointly invest capital
c) SBP invests capital, and BSNL provides satellite resources
d) The govemment invests capital for both BSNL and SBP

A

SBP invests capital, and BSNL provides satellite resources

56
Q

How is call success rate often expressed, and what does it measure?
a. Proportion of calls connected and held for two minutes; measures interference
b. Proportion of calls connected and held for two minutes; measures call reliability
c. Proportion of dropped calls; measures network capacity
d. Proportion of blocked calls; measures coverage quality

A

Proportion of calls connected and held for two minutes; measures call reliability

57
Q

What does the dropped call rate measure in radio network
a. Probability of a lost call due to interference
b. Probability of a lost call due to handover failure or coverage holes
c. Probability of successful handover
d. Probability of a call being held for two minutes

A

Probability of a lost call due to handover failure or coverage holes

58
Q

What do roll-out plans in radio network planning consider?
a. Coverage quality
b. Traffic forecasts
c. Expansion of the network
d. Network optimization

A

Expansion of the network

59
Q

Why are traffic forecasts important in radio network planning?
a. To optimize radio propagation models
b. To identify design rules and parameters
c. To develop roll-out plans
d. To understand long-term network trends

A

To understand long-term network trends

60
Q

What does spectral efficiency relate to in the context of radio network planning?
a. System capacity to the occupied bandwidth
b. Probability of a lost call
c. Interference margin calculation
d. Blocking rate calculation

A

System capacity to the occupied bandwidth

61
Q

What are the three main goals for proper planning?
a. Coverage, Spectral Efficiency, Traffic Forecasts
b. Coverage, Quality, Capacity Requirements
c. Blocking Rate, Grade of Service, Call Success Rate
d. Traffic Forecasts, Spectral Efficiency, Roll-out Plans

A

Coverage, Quality, Capacity Requirements

62
Q

What is the importance of site configuration in coverage planning Strategy?”
a. To maximize spectral efficiency
b. To minimize blocking rate
c. To optimize radio propagation models
d. To select suitable antennas and cables

A

To select suitable antennas and cables

63
Q

What is NOT a step in the radio planning?
a. Optimize the network
b. Define design rules and parameters
c. Troubleshoot network issues
d. Produce frequency plan

A

Troubleshoot network issues

64
Q

What does TEMS Investigation measure in real-time diagnostics?
a. Spectral efficiency
b. Blocking rate
c. Radio parameters, speech quality, and air interface messages
d. Interference margin

A

Radio parameters, speech quality, and air interface messages

65
Q

What is the definition of “Extraction” in Project Vijay?
a. The process of extracting information from retailers
b. the atio of telecom retail outlets selling BSNL products to total
outlets
c. The share of BSNL sales in the total sales of a retailer
d. The process of extracting value from the market

A

The share of BSNL sales in the total sales of a retailer

66
Q

Why is the existing manual accounting system for SIM/RC at
CSR/SSA considered problematic?
a. Lack of skilled personnel
b. Limited storage capacity
c. Difficulty in reconciliation
d. Inadequate reporting tools

A

Difficulty in reconciliation

67
Q

What is NOT a capability of Sancharsoft?
a. Auto activation of prepaid cards
b. Real-time utilization of infrastructure details
c. Damaged card blocking
d. Expiry/ missing cards blocking

A

Real-time utilization of infrastructure details

68
Q

What is the primary objective of the SIM module in Sancharsoft?
a. Real-time utilization monitoring
b. Management of CMTS network
c. Sales and distribution tracking
d. Broadband inventory management

A

Sales and distribution tracking

69
Q

module in Sancharsoft deals with the ease of distribution and sales of recharge
a. SIM Module
b. Recharge Module
c. C-TOP Module
d. Replacement Module

A

Recharge Module

70
Q

What is the role of the C-TOP Module in Sancharsoft?
a. Auto activation of prepaid cards
b. Sales and distribution tracking
c. Managing SIM and CAF information
d. Handling cash receipt and revenue reports

A

Handling cash receipt and revenue reports

71
Q

Which module handles activities like SIM allotment, invoice generation, and CAF monitoring in Sancharsoft?
a. Replacement Module
b. Recharge Module
c. C-TOP Module
d. SIM Module

A

SIM Module

72
Q
  1. ** What is a significant limitation of Wi-Fi networks related to
    a. Wide coverage with a single Access Point
    b. Seamless coverage in large areas
    c. Limited coverage of about 60 meters per Access Point
    d. Coverage exceeding 100 square kilometers with one Access Point
A

Limited coverage of about 60 meters per Access Point

73
Q

What is the typical coverage range of WiMAX under optimal
conditions?**
a. 100 meters
b. 5 kilometers
c. 25 kilometers
d. 50 km

A

5 kilometers

74
Q

What technology challenge does WiMAX overcome in comparison to WLAN?**
a. Limited security features
b. Higher cost
c. Grant-request MAC layer for better radio resource exploitation
d. Lack of mobility support

A

Grant-request MAC layer for better radio resource exploitation

75
Q

What does the IEEE 802.16e variant of WiMAX introduce?
a. Increased security
b. Support for mobility
c. Higher data rates
d. Improved coverage range

A

Support for mobility

76
Q

Which organization promotes the widespread adoption of WiMAX by establishing a brand for the technology?
a. IEEE
b. Wi-Fi Alliance
c. WiMAX Forum
d. WLAN Consortium

A

WiMAX Forum

77
Q

What happens during the porting process regarding the SIM card?
a. SIM card remains the same
b. Subscriber must buy a new SIM card
c. SIM card is required to be changed
d. SIM card is sent to the NPDB

A

SIM card is required to be changed

78
Q

What does MCHA stand for in the context of MNP?
a. Mobile Clearing House Administrator
b. Mobile Communications and Handling Agency
c. Mobile Charging and Billing Authority
d. Mobile Control and Handling Agent

A

Mobile Clearing House Administrator

79
Q

What is the responsibility of the Donor Operator in the MNP
a. Issuing bills to the ported-in subscribers
b. Clearing the porting request and verifying eligibility
c, Handling call routing for ported-out subscribers
d. Changing the SIM card for the subscriber

A

Clearing the porting request and verifying eligibility

80
Q

What is the time window for disconnecting the subscriber by the Donor Operator during porting?
a. 2 hours
b. 4 hours
c, 6 hours
d. 1 hour

A

1 hour

81
Q

Which database is responsible for correct call routing based on LRN
a. LPDB (Local Portability Database)
b. NPDB (National Number Portability Database)
c. B&CCS (Billing and Customer Care System)
d. MSISDN (Mobile Subscriber Integrated Services Digital Network)

A

NPDB (National Number Portability Database)

82
Q

What is the impact on BHCA handling capacity due to call routing in MNP?
a. 5-10%
b. 20-30%
c. 50-60%
d. No impact

A

5-10%

83
Q

w.r.t MNP, LRN stands for

A

Location Routing Numbers

84
Q

w.r.t MNP, NPDB stands for

A

Number Portability Database

85
Q

Which document contains details about the assigned Location Routing Numbers (LRN)?
a. MCHA Guidebook
b. TRAI Regulation dated 23.9.09
c. Operator Handbook
d. NPDB User Manual

A

TRAI Regulation dated 23.9.09

86
Q

What does the acronym LSMS stand for in the context of MNP?
a. Local Service Management System
b. Location Specific Mobile System
c. Longitudinal Subscriber Management System
d. License Service Management Solution

A

Local Service Management System

87
Q

organization issues guidelines on Unique Porting Code (UPC)
a. TRAI
b. DOT
c. MCHA
NPDB

A

TRAI

88
Q

How long is the validity of the UPC in Jammu & Kashmir, Assam, and North East licensed
a. 15 days
b. 30 days
c. 60 days
d. 10 days

A

30 days

89
Q

What is the role of the MCHA in the MNP process
a. Billing and Customer Care
b. Clearing Porting Requests
c. Mobile Network Provisioning
d. SIM Card Management

A

Clearing Porting Requests

90
Q
  1. What is the purpose of the Localized Service Management system (LSMS) in
    a. Call Routing
    b. Subscriber Billing
    c. Technical Implementation
    d. SIM Card Verification
A

Technical Implementation

91
Q

Which zones are catered to by the MCHA Licensees for Zone 1 and Zone 2?
a. North and West Zones
b. East and South Zones
c, Central and South Zones
d. North and East Zones

A

North and West Zones

92
Q

What happens during the registration process at switch-on or recovery from lack of coverage?**
- a) The MS scans the entire GSM frequency band
- b) MS ignores forbidden LAI and PLMN lists
- c) The PLMN identity is stored on the SIM card
- d) The MS attempts registration on the registered PLMN

A

The MS scans the entire GSM frequency band

93
Q

In automatic network selection mode, what is the order in which the MS attempts registration on other PLMNs?
- I. HPLMN (If not previously selected)
- II. PLNfNs in random order
- III. in “PLMN Selector” data field in the SIM (in priority order)
- IV. All other PLNfr4s in order of decreasing signal strength

A

in the given order

94
Q

What is National Roaming, and when does the MS attempt to obtain service on its HPLMN?**
a) Roaming between countries; attempts are made periodically when the MS is in automatic mode
b) Roaming within the same country; attempts are made periodically when the MS is on the VPLMN
c) Roaming with a foreign operator; attempts are made after switch-on with a specified timer
d) Roaming with a foreign MCC; attempts are made after a specified period of lack of coverage

A

Roaming within the same country; attempts are made periodically when the MS is on the VPLMN

95
Q

What is the purpose of the “EF HPLMN” value in National Roaming?
- a) To specify the frequency of LU attempts
- b) To indicate the maximum output power of the MS
- c) To define the period for attempting to obtain service on the HPLMN
- d) To set the priority order for PLMNs in manual mode

A

To define the period for attempting to obtain service on the HPLMN

96
Q

How is the random function in roaming strategies described?
- a) It is determined by the PLMN
- b) It is mobile-specific, influenced by the MS manufacturer
- c) It is standardized for all MSS
- d) It is not significant in roaming capture

A

It is mobile-specific, influenced by the MS manufacturer

97
Q

What is the role of the “Idle mode BA list” in roaming
- a) It influences active mode behavior
- b) It determines the MS’s home network
- c) It guides cell re-selection after successful registration
- d) It specifies the signal strength for network access

A

It guides cell re-selection after successful registration

98
Q

What is the recommended setting for ACCMIN to make MSs camp as long as possible on the network?
- a) -110 dBm
- b) -85 dBm
- c) EF HPLMN
- d) CCHPWR

A

-110 dBm

99
Q

What is the purpose of the setting CCHPWR in relation to roaming performance?**
- a) It influences the registradon success rate
- b) It affects the calculation of the cell selection quantity (Cl criterion)
-c) It determines the PLMN Selector data field priority
- d) It guides the MS in automadc mode

A

It affects the calculation of the cell selection quantity (Cl criterion)

100
Q

What parameter should be set to HIGH to reduce cell reselection times
A) PT
B) TO
C) CBQ
D) CRO

A

CBQ

101
Q

Which parameter gives a “bonus” to the signal strength of a cell, making mobile stations camp longer on it?**
A) PT
B) TO
C) CBQ
D) CRO

A

CRO

102
Q

What is the purpose of the PLMN selector field on the SIM card
- A) It influences radio network parameters.
- B) It determines the country of the network.
- C) It impacts the roaming performance.
- D) It defines the type of cell.

A

It impacts the roaming performance

103
Q

How does BSNL handle roaming agreements with
foreign operators?
- A) Through individual agreements for each circle.
- B) By establishing a nodal network for all circles.
- C) By having separate agreements for each service area.
D) Through direct agreements with every foreign operator.

A

By establishing a nodal network for all circles.

104
Q

Why might a mobile subscriber need to replace their SIM card for international out-roaming ?**
- A) TO switch to a higher frequency band.
- B) To enable triple IMSI support.
- C) To enhance network coverage.
- D) To comply with radio network regulations.

A

To enable triple IMSI support.

105
Q

What is the purpose of document AA-13 in the context of international roaming agreements?
- A) Legal framework
- B) Operational procedures
- C) Technical details
- D) Billing and account procedures

A

Operational procedures

106
Q

How can a BSNL subscriber select the intemational roaming opdon in their SIM card?
- A) Through the network menu under Cellone.
* B) By sending an SMS to a specific number.
- By visiting a BSNL service center.
- D) Through the phone’s display settings.

A

Through the network menu under Cellone.

107
Q

IO. Which frequency bands are mainly used by GSM networks in North and South American Continents?
A) 900/1800 Mhz
B) 1900/850 Mhz
C) 850/1900 Mhz
D) 1800/850 Mhz

A

1900/850 Mhz

108
Q

What does CRO (Cell reselection offset) provide a “bonus” to?
- A. Signal strength
- B. Handset compatibility
- C. Penalties
- D. Temporary offset

A

Signal strength

109
Q

What should be checked to improve roaming performance in border areas?
- A. Idle mode BA lists
- B. SIM card details
- C. and TO settings
- D. selector on SIM card

A

Idle mode BA lists

110
Q

How is the selector field on the SIM card suggested to be used to increase international roaming users?
A. By setting it to LOW
B. By placing foreign network identities
C. By ignoring its impact
D. By setting it to HIGH

A

By placing foreign network identities

111
Q

How did BSNL facilitate intemational roaming in areas where it didn’t have agreements with foreign operators directly?
A. bilateral agreements
B. Through CRO adjustments
C. By piggybacking on M/ s Roamware
D. By setting PINN selector to HIGH

A

By piggybacking on M/ s Roamware

112
Q

What is the significance of Triple IMSI SIM cards in international roaming for BSNL?
- A. They provide three times the network coverage.
- B. facilitate communication with three different networks.
- C. They enable selection between home, sponsor, and foreign networks.
D. They are used for high-speed data roaming.

A

They enable selection between home, sponsor, and foreign networks.

LDCE Wireless (15 decks)

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