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Chapter 3: WLAN RF Principles

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Exam Preparation Tasks

Review All Key Concepts

Review the most important topics from this chapter, noted with the Key Topics icon in the

outer margin of the page. Table 3-2 lists a reference of these key topics and the page num-

ber where you can find each one.

Table 3-2

Key Topics for Chapter 3

Key Topic Item

Description

Page Number

Figure 3-1

The Free Path Loss model

36

Figure 3-3

The absorption issue

38

Figure 3-4

The reflection issue

39

Figure 3-5

The multipath issue

39

Figure 3-9

Line of sight

45

Definition of Key Terms

Define the following key terms from this chapter, and check your answers in the Glossary:

wavelength, frequency, amplitude, EIRP, Free Path Loss, absorption, reflection, multipath,

phase (in-phase/out-of-phase), scattering, refraction, line of sight, SNR, link budget

This chapter covers the following subjects:

General Wireless Topologies:

Discusses wire-

less LAN topologies from a high-level perspective.

Original 802.11 Topologies:

Discusses wireless

network topologies defined by the IEEE.

Vendor-Specific Topology Extensions:

Explains

how vendors extend network topologies.