Mobile devices

Question 1

NFC stands for ?

Answer 1

Near Field Communication

Question 2

What is a digitizer ?

Answer 2

Device that can be written and the content will be converted from analog input (light, touch, sound,…) to digital images on the computer (touchscreen)

Question 3

LCD = ?

Answer 3

Liquid Crystal Display

Question 4

Explain LCD screens

Answer 4

• Don’t produce light
• use a backlight

Question 5

What does CCFL mean ?

Answer 5

Cold Cathode Fluorescent Lamp -> used for LCD backlight

Question 6

What does an inverter do ?

Answer 6

Converts DC to AC for the backlight
-> If there are problems with flickering or dimness it might be the inverter ;)

Question 7

TN = ?

Answer 7

Twisted Nematic
- Very old
- Good response time
- Very little lag, high refresh rate (240 Hz)
- Bad color
- Problem: bad viewing angles

Question 8

IPS = ?

Answer 8

In-plane Switching
- Great color
- Good viewing angles
- Little lag

Question 9

VA = ?

Answer 9

Vertical alignment
- Great color
- Ok response

Question 10

OLED = ?

Answer 10

Organic Light-Emitting Diode
- Light emitting compound
- No need for backlight
- Contrast ratio of OLED displays exceeds that of LCD panels
- OLED are the highest quality
- Found in smaller devices

Question 11

Port replicator = ?

Answer 11

Reproduces the function of the ports on laptop

Question 12

Docking station = ?

Answer 12

• similar to port replicator
• offers more funcionality
• also replicates ports
• can contain e.g. full-sized drive bays, expansion bus slots, optical drives, memory card slots, ports that are otherwise not available on a laptop

Question 13

Name 6 most common connection methods

Answer 13

• USB (-c, miniUSB, microUSB)
• lightning
• serial interfaces
• NFC
• bluetooth
• hotspot

Question 14

MDM = ?
MAM = ?

Answer 14

• Mobile Device Management
• Mobile Application Management

Question 15

Explain 2G

Answer 15

digital technology
Able to handle phone calls, SMS, sending out limited amounts of data

Question 16

GSM = ?

Answer 16

Global System for Mobile communications

Question 17

CDMA = ?

Answer 17

Code Division Multiple Access
Uses a PRL (preffered roaming list):
indicates which radio-bands, sub-bands, and service provider IDs will be searched for, then allows the phone to connect to the correct tower

Question 18

explain 3G

Answer 18

Allows aditional features such as mobile internet access, video calls and mobile TV

Question 19

explain 4G

Answer 19

WIMAX and Long Term Evolution (LTE) were the 2 standards
- LTE won
- faster than 3G Max 300Mbps down, 75 up
- no need for GSM and CDMA
-one standard

Question 20

explain 5G

Answer 20

100x faster than 4G
- may hit speeds of 20Gbps
- used to stream large amounts of data such as video/movies
- low-latency links:
able to cummunicate much faster, minimal delay (latency)
-> designed to support operations that require near real-time access to rapidly changing data