US Robotics USR2450 manuals

Us robotics USR2450 Technical Information (106 pages)

Brand: Us-robotics | Category: WLAN access points | Size: 2.19 MB |

English

Table of contents

Practical Wireless IP:

1

Course Contents

2

Course Objectives

2

What is Wireless

3

Wireless Component Overview

4

Wireless Devices

4

General Purpose Devices

5

FH, DS, IR, CCK(b), OFDM(a)

6

Physical Layer

7

802.11b Frame Control

8

802.11b IBSS

8

802.11b BSS

9

802.11b ESS

9

Exposures

10

Technology Problems

10

Theft of hardware

11

Registry Permissions

12

Masquerading

13

Eavesdropping

14

MAC Layer

14

MAC address configuration

15

Where are We?

17

Section Contents

17

Key Factors in Technology

18

Cellular Basics

18

Major Cellular Systems

19

GSM Security

20

Today’s Data Systems

20

CDPD Security

21

Other Popular Systems

22

What is 3G?

22

In a box …

23

Observations

23

Mobile Data Services

24

Uses a micro-browser

25

Popular delivery standards

25

Web Clipping

26

WAP Protocol Layers

28

The Gap in WAP

28

Gap in WAP

29

What Really Matters?

30

Wireless LAN Technologies

32

Upcoming WLAN

32

802.11 Local Area Wireless

33

802.11b Components

33

Current 802.11 Security

34

More on WEP Keys

35

Access Points and WEP

35

WEP Encryption Steps

36

WEP Encryption

36

WEP Decryption Steps

37

WEP Decryption

37

128-bit Version (WEP2)

38

WEP Key Management

38

The Major WEP Problems

39

Problem: Keystream Reuse

40

-- as key length increases

41

Current Status of WEP

42

Current Status of WEP (cont)

43

Current 802.11 Authorization

44

Wireless EAP: Cisco’s Version

45

Let’s take a look…J

47

Access Points 101

49

Frequency Overlap

50

Access Point Usage

50

Extension Point

51

Access Point Placement

51

Placement (cont.)

52

Placement, 3 Dimensional

53

Capacity and Bandwidth

53

Bandwidth Aggregation

54

Anatomy of 802.11b

55

Anatomy of 802.11b: the bits

55

Anatomy of 802.11b: the wave

56

Congestion (cont.)

57

Hidden Node Problem

58

Finding those Hidden Nodes

59

Surprising Results

60

What Does This Mean?

60

Anatomy of 802.11b: Roaming

61

Roaming (cont.)

61

Roaming Activities

62

IEEE IAPP

63

Wi-FI Roaming (cont.)

64

Configuring an Access Point

65

Access Point Medicine

65

Wireless at Home

67

Wireless at a Conference

68

Industry Setup: Ariba

68

CyberCafe

69

Architectural Considerations

69

Linux Wireless RF Sniffer

71

Linux Sniffer: How-To

72

How-To (cont.)

72

Sniffer Observations

73

AirSnort

73

Home Spun Access Point

74

Building your own AP

74

My Problems

75

My Observations

76

How Does it Work?

77

IEEE 802.11a

79

1W5.725-5.825

80

802.11a Coverage

81

802.11a Coverage Graphic

81

802.11a Problems

82

802.11 Thoughts

82

Antennas: The Skinny

84

Antennas: Basics

85

Antennas: Basics (cont.)

85

Antennas: Dipole

86

Dipole Radiation

86

Antennas: Directional

87

Directional Radiation: Biquad

87

Antennas: PCMCIA Cards

88

Typical PCMCIA Radiation

88

Antennas: More Facts

89

Antennas: More Facts (cont.)

89

Thanks to …

92

References

93

References (cont.)

93

Wireless Stuff

95

Mailing Lists

95

Glossary

96

Glossary (cont.)

96

Glossary(cont.)

97

End Matter

98

Apple Airport

99

Building your own AP (cont.)

100

Directions (cont.)

101

Floppy based Wireless Gateway

103

WFG Internals

103

WFG Internals (cont.)

104

Consultant

106

Brad C. Johnson

106

Vice President

106

Philip Cox

106

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