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ICT > Digital communication 3 > Flashcards

Digital communication 3 Flashcards

1
Q

Describe how analogue television and Radio work-

A

Transmitters broadcast television and radio signals that are received by a viewers antenna. The antenna sends a signal through a wire to the television or radio receiver, which converts it into images and audio.

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2
Q

Describe how analogue television and Radio work-

A

Transmitters broadcast television and radio signals that are received by a viewers antenna. The antenna sends a signal through a wire to the television or radio receiver, which converts it into images and audio.

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3
Q

What is DVB-T

A

It is digital video broadcasting terrestrial which is a method of DVB where the transmitters are based on earth rather than in orbit as they were in DVB-S.

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4
Q

To receive digital television broadcasts transmitted by DVBT, do you need a special antenna?

A

No, the same antenna used to receive analogue broadcasts can be used.

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5
Q

What is the newer standard of DVB-T and what additional functionality does it provide?

A

DVB-T2
HDTV and interactive services.

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6
Q

Can broadcast communication televisions by pass tv and radio receivers?

A

Yes

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7
Q

Where is digital audio broadcasting mainly used in?

A

Europe and the Asia pacific region

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8
Q

How is DAB better than other traditional forms of radio broadcasting such as FM?

A

It provides more radio stations meaning listeners have wider variety of choice.
It can carry text data which the DAB receivers can display. The text can include the time, name of station and details of the music being played.

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9
Q

How can devices communicate with each other via a wired a connection-

A

Using cables

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10
Q

Define ethernet-

A

A network connectivity standard that provides a way for computers to communicate.

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11
Q

What are HDMI’s used for?

A

Digital video connections

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12
Q

S/PDIF

A

Digital audio connections

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13
Q

Minijack

A

Personal headphones

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14
Q

USB

A

Storage transfer

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15
Q

Ethernet

A

Netwoking

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16
Q

Why has the USB gone through multiple revisions?

A

Each revision allows faster data transfer speeds.

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17
Q

Why is the development of standards such as the multiple revisions of the USB common with all types of connectivity and why is it necessary.

A

Digital devices become more complex in their features and functionality.

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18
Q

What does ethernet allow the user to do?

A

Connect to a wired network.

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19
Q

What happens as ethernet technology develops?

A

The speed at which data can be transferred between devices is improved.

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20
Q

What is a cool fact about ethernet cables?

A

Ethernet cables can be a 100 meters long before the signals they carry start to lose quality.

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21
Q

How are WIFI and internet different from each other?

A

WIFI allows you to wirelessly access a network.
That network may or may not be connected to the internet.

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22
Q

Where is WIFI mainly used in?

A

Home and office networks. However some companies provide WIFI access in towns and cities.

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23
Q

What is WIFI

A

WIFI is a wireless technology used to connect devices to a network.

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24
Q

How can WIFI be used to connect to the internet?

A

The network itself , which WIFI connects devices to, can connect to the internet, so that the devices connected to the WIFI network can connected to the internet.

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25
Q

What specification does WIFI use for standard wireless communication?

A

IEEE 802.11

26
Q

Why is the WIFI specification regularly revised?

A

To take into account the improvements in technlogy.

27
Q

What was the first version of the WIFI specification?

A

802.11.a

28
Q

What 2 things does each revision to the specification do?

A

Improves the speed at which data can be transferred.
Increases the distance over which devices can connect.

29
Q

What is blue tooth

A

A type of wireless connectivity that lets devices connect over short distances.

30
Q

In what two ways is blue tooth different from WIFI?

A

Bluetooth cannot carry as much data as WIFI.
Blue tooth devices need to be paired with each other before they can communicate.

31
Q

Define paired-

A

Connect two devices(usually only with each other)

32
Q

Compare the range of blue tooth and WIFI

A

Blue tooth short
WIFI long

33
Q

Compare the bandwidth of blue tooth and WIFI-

A

Blue tooth low WIFI high

34
Q

Compare the power of WIFI and blue tooth-

A

WIFI high
blue tooth low

35
Q

Compare the security of WIFI and blue tooth.

A

WIFI high
blue tooth low

36
Q

Compare WIFI’s and blue tooth’s ability to connect multiple devices simultaneously.

A

WIFI- yes
Blue tooth limited (usually have to be paired)

37
Q

What are 3G and 4G sometimes referred to as?

A

Mobile broadband

38
Q

What are 3G and 4G used for?

A

To provide internet access to mobile devices such as smart phones and tablet devices when a WIFI signal is not available.

39
Q

Future generations of broadband technology are designed to?

A

Improve the speed
improve the availability of the signal.

40
Q

Why are 3G or 4G and WIFI not the same?

A

3G or 4G connectivity is provided by mobile phone companies. Some people say they have WIFI when they have a mobile broadband connection.

41
Q

Define infra-red-

A

Type of electromagnetic radiation with a longer wavelength than that of visible light.

42
Q

Why is Infra-red connectivity disadvantageous?

A

Infra-red signals cannot carry much data and only have a short range.
The signal is also affected by sunlight.

43
Q

Why must infra-red have clear line of site to receivers?

A

This allows the signals to travel in a straight line without being blocked by solid objects like walls.

44
Q

What is infra-red often used in?

A

Remote control devices such as television remote controls.

45
Q

What does NFC use?

A

close proximity radio frequency identification chips.

46
Q

What is NFC used in?

A

Smartphones, payment cards and travel cards.

47
Q

What is cellular network another name for?

A

Mobile phone network.

48
Q

Compare the cost of wired and wireless connections.

A

Wired connections- cables are cheap for a small number of devices.
Wireless connections- No need to buy cables.
May need a wireless access point for multiple connections.

49
Q

Compare the safety of wired and wireless connections.

A

Wired connection-Risk of tripping over cables
Wireless connections- None

50
Q

Compare the speed of wired and wireless connections.

A

Wired connections are faster.

51
Q

Compare the stability of wired and wireless connections.

A

Wired connections are less affected by interference.
Wireless connections are affected by interferences and obstacles.

52
Q

Compare the portability of wired and wireless connections.

A

Wired connections are not portable as limited by connecting cables.
They may require a signal booster if the connection is more than 100m long.
Wireless connections are portable within the signal range.

53
Q

Compare the mess of wired and wireless connections.

A

Wired connections can look untidy if lots of cables are used.
Wireless connections are tidy.

54
Q

Compare the security of wired and wireless connections.

A

Wired connections are the most secure and wireless connections are less secure as it is easier to intercept a wireless signal.

55
Q

Compare the maintenance of wired and wireless connections.

A

Wired connections- using cables and ports continuously over long periods of time may damage them.
No maintenance required for wireless connections

56
Q

How are ISP’s and broadbands related?

A

Mobile broadbands provide fast access to the internet through a connection to an internet service provider.

57
Q

What two cable networks do broadband networks use?

A

Fiber optic cable and copper cable networks.

58
Q

Define internet service provider-

A

A company that provides customers with access to the internet.

59
Q

Fiber optics cable

A

a cable that sends data using light signals.

60
Q

copper cable

A

A cable that sends data using electric signals, which are conducted through copper.

61
Q

What does a mobile broadband provide?

A

Mobile broadband provides high speed wireless connectivity using 3G or 4G technology to connect the mobile phone to the network, which acts as the user ISP

ICT (8 decks)

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