AO2: Data Communication Methods Flashcards
1
Q
5 Different transmission media features
A
Reliability Flexibility Susceptibility to signal noise Ease of installation Effective operational range Security.
2
Q
What is simplex
A
unidirectional
sender can only send data
worst performing mode of transmission
radio
3
Q
What is half-duplex
A
Two-directional, one at the time
sender can send and receive
better than simplex
walkie-talkie
4
Q
What is duplex
A
Full duplex two-directional, simultaneously Sender can send and receive data simultaneously Best performing mode of transmission telephone
5
Q
What does GSM (2G) stand for? What are the key features?
A
Global System for Mobile released in 1991 worldwide expect japan and south korea Used a SIM card Max speed of 384 kbit/s
6
Q
SIM form factors
A
mini-sims
micro-sims
nano-sims
7
Q
What are: SIM IMSI PIN PUK
A
Starts: Subscriber identity module (SIM) International mobile subscriber identity (IMSI) Personal identification number (PIN) Personal unblocking key (PUK)
8
Q
Name the four different mobile services
A
Short message service
Over the air programming
Global Positioning System
Mobile broadband and tethering.
9
Q
Features of 2.5G
A
Speeds of 56kbps to 115Kbps
allows MMS Services
Used to provide higher seeds than 2G
Packet-based wireless communication