Chap 4(Digital Communication)

Question 1

Factors affecting speed and volume of data transfer

Answer 1

•Transfer Method:Wired>Wireless(More frequencies as copper>radio wave)

•Distance

•Blockage: Reduce strength of wireless signals

•Interference : Wired>Covered>less interference

Question 2

Types of wired connection?

Answer 2

•Minijack: Personal headphones
•S/PDIF: Digital Audio connection
•HDMI(High-Definition Multimedia Interface): Digital vd connection
•USB: Storage transfer
•Ethernet: Networking

Question 3

Alternative connectivity to Bluetooth?

Answer 3

-Wifi Direct(Low power version)
-connect 2 devices in short rang3

Question 4

Pros and Cons of Wired Connection

Answer 4

Pros
•Higher Bandwidth
•More secure( shielded)
•More stable connection
•No PW needed

Cons
•Cannot move around
•Cost of Cables
•Health hazard(Trailing wires)
•Waste time finding/connecting cables

Question 5

Pros and Cons of Wireless connection?

Answer 5

Pros
•Portability(Move around)
•No trialing wires(Health and safety)
•Saves cost of cables (cheaper)
•Doesnt waste time finding cables

Cons
•Less secure(No shielding->Easily intercepted)
•Less stable(Due to interference and blockage)
•Lower Bandwidth (Some signals are lost in air)
•Shorter range(Distance)

Question 6

Pros and Cons of connecting Tablet to TV

Answer 6

Pros
•Expanded screen as TV is larger and allow us to view bigger
•Higher resolution
•Less health and safety risk(eye strain)
•Better sound quality

Cons
•Lead to buffering/lagging
•Noti can be seen by others
•Drain tablet’s power quickly
•Greater demand on tablet’s resources

Question 7

Cons of IR?

Answer 7

•Requires clear line of sight between transmitter and receiver
•Cause interference by sunlight so low bandwidth
•Cannot carry as much data
•Short range

Question 8

Why distance affect speed of transfer?

Answer 8

Data packets have to be requested again as the signal strength degrade as it travels

Question 9

Why sharing internet connection would affect the bandwidth available?

Answer 9

-Bandwidth is fixed and it has to be divided between devices(less bandwidth)

Question 10

Pros and cons of streaming

Answer 10

Pros
•Doesn’t need to wait for full download
•Doesn’t require local storage
•Accessible from anywhere with a connection
•Suggestion can be shown

Cons
•Privacy risk while streaming(Digital Footprint)
•May lag due to latency
•Require strong internet
• resolution drop or pause due to bandwidth (Affect Quality)

Question 11

Pros and Cons of downloading?

Answer 11

Pros
•Offline access (No internet needed)(Any time)
•Can edit the files
•Can keep as long as they want
•Smooth play(Quality control as it is downloaded)
•Protect privacy by reducing digital footprint
•No buffering as it is stored locally.

Cons
•Need to wait to finish download
•Requires local storage
•Risk of malware if download from unreliable source

Question 12

Rank the speed of wireless connection.

Answer 12

1.5G
2.4G
3.Wi-Fi
4.W-Fi Direct
5.3G
6.Bluetooth
7.IR

Question 13

In what network is Wifi Direct used?

Answer 13

Peer to Peer network(One to one or one to many)
And
PAN

Question 14

What’s tethering?

Answer 14

Connecting to host device that uses mobile broadband with other devices so that they can use host’s broadband connection

Question 15

Ways to tethering?

Answer 15

•USB tethering
•WiFi Hotspot(Battery drainage)
•Bluetooth tethering

•NFC tethering
•QR tethering

Question 16

Cons of tethering?

Answer 16

•Power consumption (Battery drainage, especially with WiFi)

**(my thought)
•Lower Bandwidth as fixed bandwidth is shared
•Short range
•Might intercept?
•More data usage(Cost expensive)

Question 17

Rank all wired connection with bandwidth

Answer 17

1.Fibre Optics(Use light)
2.Ethernet(Cat5e, Cat6, Cat6a)
3.Copper Coaxial

4.Powerline communication
5.Digital Subscriber Line

Question 18

How is hotspot different from tethering?

Answer 18

A feature on mobile devices that allows it to act as portable WAP providing WiFi signal to other devices so they can access to the host’s broadband

Question 19

Examples of PAN?

Answer 19

•Bluetooth
•Wi-Fi Direct
•NFC
•Tethering
•IR

Question 20

Uses and technology of Satellites and broadcast?

Answer 20

Broadcast: TV shows, radio
Satellites: GPS, Telephone, TV, Military
Both: Radio waves technology