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Wireless Networks

Notes
Figure 7.4: Many Different Types of User Devices Operate on Wireless PANs

Source: http://etutorials.org/Networking/wn/Chapter+4.+Wireless+PANs+Networks+for+Small+Places/Wireless+PAN
+Components/
7.3.2 Radio NICs

Radio NICs are available for wireless PANs in PC Card and Compact Flash (CF) form factors.
If you have a laptop, for example, it’s easy to add wireless PAN connectivity by installing a
PC Card. These products are available from different vendors. Many of the newer PDAs and
laptops come equipped with one or more wireless PAN interfaces. This makes these wireless
devices ready to connect with other devices, such as printers, PDAs, and cell phones that also
have wireless PAN interfaces. The larger PC Cards are uncommon for wireless PANs, mainly
because wireless PAN technologies are ideal for small devices.

7.3.3 Access Points

In computer networking, a wireless access point (WAP) is a device that allows wireless devices
to connect to a wired network using Wi-Fi, or related standards. The AP usually connects to a
router (via a wired network) as a standalone device, but it can also be an integral component of
the router itself.

7.3.4 Routers

Most wireless PAN applications simply involve cable replacement, but some vendors sell
Bluetooth-equipped routers to support wireless connections to the Internet. Because of limited
range, though, these wireless PAN routers are primarily for home and small office use. In order
to satisfy more connectivity needs, some wireless PAN routers also support wireless LAN
interfaces, such as 802.11.

7.3.5 Repeaters

A wireless repeater (also called wireless range extender) takes an existing signal from a wireless
router or access point and rebroadcasts it to create a second network. When two or more hosts
have to be connected with one another over the IEEE 802.11 protocol and the distance is too long
for a direct connection to be established, a wireless repeater is used to bridge the gap. It can be
a specialized stand alone computer networking device. Also, some WNICs optionally support
operating in such a mode. Those outside of the primary network will be able to connect through
the new “repeated” network. However, as far as the original router or access point is concerned
only the repeater MAC is connected. So safety features must be enabled on the wireless repeater
as well. Wireless repeaters are commonly used to improve signal range and strength within
homes and small offices.

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