AO2: Data Communication Methods

Question 1

5 Different transmission media features

Answer 1

Reliability
Flexibility
Susceptibility to signal noise
Ease of installation
Effective operational range
Security.

Question 2

What is simplex

Answer 2

unidirectional
sender can only send data
worst performing mode of transmission
radio

Question 3

What is half-duplex

Answer 3

Two-directional, one at the time
sender can send and receive
better than simplex
walkie-talkie

Question 4

What is duplex

Answer 4

Full duplex
two-directional, simultaneously
Sender can send and receive data simultaneously
Best performing mode of transmission
telephone

Question 5

What does GSM (2G) stand for? What are the key features?

Answer 5

Global System for Mobile
released in 1991
worldwide expect japan and south korea
Used a SIM card
Max speed of 384 kbit/s

Question 6

SIM form factors

Answer 6

mini-sims
micro-sims
nano-sims

Question 7

What are:
SIM
IMSI
PIN
PUK

Answer 7

Starts:
Subscriber identity module (SIM)
International mobile subscriber identity (IMSI)
Personal identification number (PIN) 
Personal unblocking key (PUK)

Question 8

Name the four different mobile services

Answer 8

Short message service
Over the air programming
Global Positioning System
Mobile broadband and tethering.

Question 9

Features of 2.5G

Answer 9

Speeds of 56kbps to 115Kbps
allows MMS Services
Used to provide higher seeds than 2G
Packet-based wireless communication