AO2: Data Communication Methods Flashcards Preview

AQA Cyber Security UNIT 2: Communication Tech > AO2: Data Communication Methods > Flashcards

Flashcards in AO2: Data Communication Methods Deck (9)
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1

5 Different transmission media features

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

2

What is simplex

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

3

What is half-duplex

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

4

What is duplex

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

5

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

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

6

SIM form factors

mini-sims
micro-sims
nano-sims

7

What are:
SIM
IMSI
PIN
PUK

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

8

Name the four different mobile services

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

9

Features of 2.5G

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