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Wireless EXAM ACE IT > Frequency Bands > Flashcards

Frequency Bands Flashcards

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1
Q

List of unlicensed frequencies

A

ISM (Industrial, scientific, medical)
Personal Communication Systems
National Information Infrastructure
Milimeter Wave

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2
Q

Info of ISM

A 
Frequency
902 - 928 mhz
2.4 - 2.4835 ghz
5.725 - 5.825 ghz
Total bandwidth
234.5 mhz
Cordless phone
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3
Q

Info of Personal Communcation System

A

1910 - 1930 mhz
2390 - 2400 mhz
30 mhz
WLANs, wpbe

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4
Q

Info of national information infrastructure

A

5.15 - 5.25
5.25 - 5.35
5.725 - 5.85
300 mhz
Wlan, wpbe, campus application

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5
Q

What is milimeter wave?

A

59.64 ghz

5 ghz Home network applications

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6
Q

Three spots of ISM

A

900 mhz: 902-928mhz

  1. 4 ghz: 2.4 - 2.5
  2. 8 ghz: 5.725 - 5.875
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7
Q

What is 900 mhz ism band?

A

902 - 928 mhz

used for baby monitors

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8
Q

2.4 Ghz band

A

Most common

used my microwaves, cordless home telephones, baby monitors

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9
Q

5.8 ghz band

A

5.725 - 5.875

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10
Q

What is UNII?

A

Unlicensed National Information Infrastructure bands

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11
Q

Types of UNII?

A

UNII 1 - Lower
UNII 2 - Middle
UNII 2 Ext - Middle Extended
UNII 3 - Upper

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12
Q

UNII 1

A

5.15 Ghz - 5.25 Ghz
40 mW
Indoors

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13
Q

UNII 2

A

5.25 ghz - 5.35 ghz
200 mW IR
FCC 250 mW IR
Indoor or outdoor

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14
Q

UNII 2 Ext

A 
5.470 - 5.725 GHZ
255 Mhz wide
11 channels
200 mW
Indoor - Outdoor
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15
Q

What is DFS?

A

Dynamic Frequency Selection

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16
Q

What is TPC?

A

Transmit Power Control

17
Q

UNII 3

A

5.725 - 5.825 Ghz
800 pW
Outdoor point to point

18
Q

Why would white space?

A

Because of the longer range

19
Q

What is a narrowband?

A

Its a signal that uses very little bandwidth

Transmitted using higher power

20
Q

What is a spread spectrum?

A

Uses more bandwidth than is necessary to carry its data

Spreads the data accross frequencies

21
Q

What is FHSS?

A

Frequency Hopping Spread Spectrum

22
Q

What is DSSS?

A

Direct Sequence Spread Spectrum

23
Q

What does DSSS do?

A

Transmits data across a frequency wide range
DSSS - 1 - 2 mbps
HR-DSSS - 5.5 - 11 mbps

24
Q

How is narrowband spread?

A

By chiping sequence

25
Q

What is OFDM?

A

Ortogonal Frequency Division Multiplexing
It divides the whole bandwidth into 52 subcarriers
48 of them carry data
4 of them are pilot subcarriers that contain reference to phase or ampitude

26
Q

Throughput vs Bandwidth?

A

Bandwidth is the maximum amount of data that can travel

Throughput how much data actually travels

27
Q

What does data throughput depend on?

A 
Frequency bandwidth
Data encoding
Modulation
Medium contention
Encryption
Number of current users

Wireless EXAM ACE IT (5 decks)

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