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Wireless Networks 89
electromagnetic interference. The delicate nature of fiber-optic requires special expertise to
install, which can be costly. Figure 3-7 depicts an example of fiber-optic cable.
Figure 3-7
Fiber-Optic Network
Wireless Networks
Cables are one way to transmit data between computers. Air is another medium that allows
transmission between networks. Wireless networks can provide a missing ingredient of network
design. Wireless networks can provide temporary connections to an existing network. Wireless
networks can grant the user portability and can extend the physical length of the network. They
might be the perfect solution for granting network access from lobbies and reception areas.
Constantly mobile users would benefit from wireless networks because, no matter where they
are in the building, they've got an instant LAN connection.
Infrared wireless networks function by using an infrared light beam to carry the data between
devices. Because transmission signals are susceptible to interference, the system must generate
strong signals. A infrared network can normally broadcast at 10 Mbps.
NOTE
Infrared is subject to interference from the strong ambient light found in most business
environments. Infrared might not be effective beyond 100 feet.
Optical fiber (core)
Glass cladding
Protective outer sheath
(jacket)
Kevlar
Fiber-optic connector
87200333.book Page 89 Wednesday, August 22, 2001 2:18 PM