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.
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2
Q

What is simplex

A

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

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3
Q

What is half-duplex

A

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

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4
Q

What is duplex

A
Full duplex
two-directional, simultaneously
Sender can send and receive data simultaneously
Best performing mode of transmission
telephone
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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
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6
Q

SIM form factors

A

mini-sims
micro-sims
nano-sims

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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)
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8
Q

Name the four different mobile services

A

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

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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

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