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Unit 7: Wireless LAN
z Augmentative communication devices Notes
z Car locking systems
z Computers
z Emergency response systems
z Environmental control systems
z Headphones
z Home security systems
z Navigation systems
z Signage
z Telephones
z TVs, VCRs, CD players, stereos
z Toys
Self-Assessment
Fill in the blanks:
1. The basic building block of the WLAN network is the ............................. basic service set
(BSS).
2. In Infrastructure BSS Networks topology, all stations within the BSS communicate with
each other through an .............................
3. ............................. Spectrum (DSSS) generates a redundant bit pattern for each bit to be
transmitted.
4. In the study of wired channels, ............................. implies that the channel over consideration
is sufficiently narrow that its frequency response can be considered flat.
5. In telephony, narrowband is usually considered to cover frequencies ............................. Hz.
6. Spread spectrum enables a signal to be transmitted across a frequency band that is much
wider than the ............................. bandwidth required by the information signal.
7. ............................. is the region of the electromagnetic spectrum between microwaves and
visible light
7.3 Wireless LAN Components
The different WLAN components are discussed below.
7.3.1 User Devices
Wireless PANs don’t require much battery power to operate, making them ideal for small user
devices, such as audio headsets, cell phones, PDAs, game controls, GPS units, digital cameras,
and laptops. Figure 7.4 illustrates several of these types of devices.
For example, a wireless PAN enables someone to listen to music on headsets wirelessly from
their PDA. Or a person can transfer his phone book from his laptop to a cell phone. As with these
cases, wireless PANs eliminate wires that often frustrate users.
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