Interview Questions.

Q1. What Are The Three Phases In Ey-npma?

Prioritization: Determine the highest priority of a statistics packet prepared to be despatched on competing nodes.

Contention: Eliminate all but one of the contenders, if more than one sender hasthe maximum present day priority.

Trmission: Finally, trmit the packet of the closing node.

Q2. What Is Meant By Gprs?

The General Packet Radio Service presents packet mode trfer for applications that exhibit traffic styles inclusive of frequent trmission of small volumes.

Q3. What Is Fdd?

In FDMA, the bottom station and the cellular station set up a duplex channel. The  instructions, cellular station to base station and vice versa are separated the use of distinctive frequencies. This Scheme is called Frequency Division Duplex (FDD)

Q4. What Do You Meant By Roaming?

Moving among get entry to factor is referred to as roaming. Even wireless networks may also require a couple of get right of entry to factor to cover all rooms. In order to provide uninterrupted provider, we require roaming while the consumer actions from one get right of entry to point to any other.

Q5. What Are The Goals Of Dvb?

The aim of DVB is to introduce digital TV broadcasting the use of satellite tv for pc trmission (DVB-5) cable technology (DVB-c) and terrestrial trmission (DVB-7).

Q6. What Is Meant By Geo?

GEO me Geostationary or Geosynchronous earth orbit. GEO satellites have a distance of virtually 36000 km to the earth. Examples are nearly all TV and radio broadcast satellites, many weather satellites and satellites working as spine for the cellphone community.

Q7. What Is The Primary Goal Of Iee 802.Eleven?

The number one intention of the same old changed into the specification of a easy, strong, WLAN which gives time bounded and asynchronous offerings additionally it should be capable of operate with a couple of physical layers.

Q8. What Are The Functions Which Support Service And Connection Control?

Access factor control function

Call control and connection control feature

Network safety agent

Service manipulate characteristic

Mobility control characteristic

Q9. What Are The Advantages Of Dvb?

Data rates deliberate for customers are 6-38mbit/s for the downlink and 33-100kbit/s for the uplink.

Trmitted together with TV programmes and doesn’t require additional strains or hardware per consumer.

Can be utilized in remote areas and developing countries wherein there's no excessive band width stressed out network.

Q10. What Are Subsystems In Gsm System?

Radio subsystem (RSS)

Network & Switching subsystem(NSS)

Operation subsystem(OSS)

Q11. What Is Object Repetition?

DAB can repeat gadgets numerous times. If an item A consists of 4 segments (A1, A2, A3, A4) a unmarried repetition sample might be A1A2A3A4A1A2A3A4A1A2A3A4……..

Q12. What Are The Four Types Of Handover Available In Gsm?

Intra cellular Handover

Inter mobile Intra BSC Handover

Inter BSC Intra MSC handover

Inter MSC Handover

Q13. What Are The Registers Maintained By The Gateway Of Satellite?

Home Location Register (HLR).

Visitor Location Register (VLR).

Satellite User Mapping Register (SUMR).

Q14. What Are Types Of Handover?

Intra-cellular handover

Inter-cell ,intra- BSC handover

Inter-BSC, intra-MSC handover

Inter MSC handover

Q15. What Are The Services Provided By Supplementary Services?

User identity

Call redirection

Call forwarding

Closed person organizations

Multiparty Communication

Q16. What Are Advantages And Disadvantages Of Infrared?

Advantages:

Simple and extraordinarily reasonably-priced senders and receivers which incorporated in nearly all cell devices

No licenses are wished for infrared era and defensive is very simple.

Electrical devices do no longer intervene with infrared trmission.

Disadvantages:

Low bandwidth

Quite without difficulty shielded

Cannot Penetrate

Q17. What Is Fic?

The Fast Information Channel(FIC) consists of Fast Information Block(FIB) with 256bits every(sixteen bit checksum). An FIC includes all control statistics that's required for decoding the configuration and content material of the MSC.

Q18. What Is Meant By Non-chronic Csma?

In, non-persistent CSMA, stations feel the provider and start sending right now if the medium is idle., if the medium is busy, the station pauses a random amount of time earlier than sensing the medium again and repeating this sample.

Q19. Name Some Of The Formats Supported By Mot?

Multimedia and Hypermedia statistics coding professionals    group(MHEG)

Join image’s professionals institution(JPEG)

American widespread code for information interchange(ASCII)

Moving pix professional group(MPEG)

Hypertext markup language(HTML)

Hypertext trfer protocol(HTTP)

Bitmap(BMP)

Graphics interchange layout(GIF)

Q20. Define Cdma?

Code Division Multiple Access structures use codes with positive characteristics to split exclusive customers. To allow get entry to to the shared medium without interference. The users use the same frequency and time to trmit facts. The essential hassle is to find good codes and to split this signal from noise. The right code can be located the subsequent 2 characteristic

Orthogonal.

AutoCorrelation.

Q21. What Is Meant By Sifs?

SIFS me Short Inter Frame Spacing. The shortest ready time defined for quick manage message such as acknowledgements or polling response.

Q22. What Is Handover?

The satellite tv for pc is the bottom station in satellite tv for pc communication structures and that it self is moving. So, additional instance of handover are vital because of the movement of the satellite

Intra Satellite handover:

Inter Satellite handover.

Gateway handover.

Inter System handover.

Q23. What Are The Advantages Of Leo?

Data price is 2400 bit/s

Packet delay is enormously low

Smaller footprints of LEO permits frequency reuse

Provide excessive elevations

Q24. What Is Meant By Beacon?

A beacon carries a timestamp and other management records used for strength control and roaming. E.G., identification of the base station subsystem (BSS).

Q25. What Are The Service Information Sent By Dvb?

Digital Video Broadcast Containers are basically MPEG-2 frames. DVB sends carrier records. This records is, 

Network records table(NIT).

Service Description Table(SDT).

Event Information Table(EIT).

Time and Date Table(TDT)

Q26. What Are The Logical Channels In Gsm?

Traffic channel (TCH)

Control channel (CCH)

Q27. What Is Eit?

Event Information Table (EIT) contains reputation statistics about the modern trmission and some additional statistics for set-pinnacle containers.

Q28. What Are The Advantages Of Geo?

Three GEO satellites are enough for a whole insurance of almost any spot on earth, senders and receivers can use constant antennas positions, and no adjusting is wanted. Therefore GEO’s are best for T.V and radio broadcasting.

Q29. What Is Mobile Routing?

Even if the place of a terminal is thought to the system, it nonetheless has to course the visitors thru the community to the get admission to point presently accountable for the wi-fi terminal. Each time a consumer moves to a new get admission to factor, the device should reroute visitors. This is referred to as mobile routing.

Q30. Define Sama?

Spread Aloha Multiple Access is a combination of CDMA and TDMA. The CDMA better fits for connection orientated services most effective and no longer for connection less bursty records visitors as it calls for to software both sender and receiver to access different customers with different codes.

Q31. What Is Tetra?

TETRA (Terrestrial Trunked Radio) structures use special radio provider frequencies, but they assign a particular service frequencies for a quick time frame in line with call for. 

Q32. What Is Passive Scanning?

Passive Scanning Simply me listening into the medium to locate other networks, i.E. Receiving the beacon of every other network issued through the synchronization characteristic inside an get admission to point.

Q33. What Is Sco?

SCO-stands for Synchronous Connection Oriented Link Standard phone (voice) connection require symmetrical, circuit-switched, point-to-point connections. For this type of link, the grasp reserves  consecutive slots at constant intervals.

Q34. What Is Msc?

Main Service Channel(MSC) includes all person facts. Eg. Audio, multimedia statistics.

Q35. What Are Different Interleaving And Repetition Schemes Applied By Dab To Objects And Segments?

Object Repetition.

Interleaved Objects.

Segment repetition.

Header repetition.

Q36. What Are The Categories Of Mobile Services?

Bearer services

Tele services

Supplementary offerings

Q37. What Are The 2 Sub Layers In Dlc?

Logical Link Control(LLC)

Media Access Control(MAC)

Q38. What Is Sdma?

Space Division Multiple Access (SDMA) is used for allocating separated areas to customers in wireless networks. The basis for the SDMA set of rules is shaped with the aid of cells and sectorized antennas which represent the infrastructure imposing space department multiplexing (SDM)

Q39. What Do You Mean By Polling?

Polling is a strictly centralized scheme with one grasp and numerous slave stations. The master can collect the listing of stations at some point of the contention section and can ballot  those slaves consistent with many schemes like round robin, random get right of entry to, reservation scheme etc.

Q40. What Are Advantages Of Wireless Lan?

Flexibility,

Planning,

Design,

Robustness,

Quality Service,

Cost,

Proprietary Solution,

Restriction,

Safety and Security

Q41. Define The Elevation Angle And Footprint?

The elevation perspective is defined as the angle between the centre of satellite tv for pc beam and the plane tangential to the earth’s floor. The foot-print may be described because the region in the world in which the indicators of the satellite tv for pc can be received.

Q42. What Are The Several Versions In Csma?

There are several versions in CSMA, they're as follows

non-continual CSMA

p-continual CSMA

1-continual CSMA

Q43. What Are The Applications In Satellites?

Weather forecasting satellites

Radio & TV broadcast satellites

Military satellites

Satellites for navigation

Mobile communication

Q44. What Are The Information In Sim?

Card type, serial no, list of subscribed offerings

Personal Identity Number (PIN)

Pin Unlocking Key (PUK)

An Authentication Key (KI)

Q45. What Are The Advantages Of Dab?

DAB can offer sound in CD like best.

DAB can use single frequency network where all senders trmitting the identical radio program can operate at the equal frequency.

DAB use VHF and UHF frequency bands.

DAB uses DQPSK modulation scheme.

DAB person COFDM and FEC.

DAB can trmit up to 6 stereo audio programmes with a records rate of 192kbit/s each.

Q46. What Is Ey-nmpa?

Elimination yield –Non Pre-emptive Multiple Access (EY-NMPA) is a scheme which makes use of several stages to feel the medium. Access the medium and for competition decision... Priority schemes also can be protected. This is surely utilized in HIPERLAN1 specification.

Q47. What Are Design Goals Of Wireless Lan?

Global Operation

Low Power

License-loose Operation

Robust trmission technology

Simplified spontaneous co-operation

Easy to use

protection of funding

Safety and Security

Trparency for application

Q48. What Is The Function Of Medium Access Control Layer?

The feature of Medium Access Control Layer is liable for establishes, continues, and releases channels for better layers through activating and deactivating bodily channels.

Q49. What Are The Three Low Power States Provided By Bluetooth?

PARK country

HOLD kingdom

SNIFF country

Q50. Define The Inclination Angle And Perigee?

The inclination angle is defined as the angle among the equatorial aircraft and the plane defined by the satellite orbit. An inclination perspective of 0 levels me that the satellite tv for pc is precisely above the equator. If the satellite tv for pc does no longer have a circular orbit, the nearest factor to the earth is referred to as the perigee.