Reference
Precautions when installing wireless LANs
A wireless LAN enables communication
within the range of radio waves, which
requires security considerations beyond
that of a cable-based LAN.
Authentication functions and communication encryption functions are often
used to provide security.
●Wireless LAN
Wireless LAN is a technology for building networks using radio waves or
infrared rays.
Since no cables are used, wireless LANs are used in places where the office layout is changed frequently, the wiring is complicated, or a tidier appearance is necessary.
Since there are several wireless LAN standards, care must be taken to
match the supported standards. If the standards are not the same, communications will not be possible.
Several types of wireless LANs are summarized below.
Standard
IEEE
802.11a
Frequency Transmission
band
rate
5.2GHz
IEEE
802.11g
54Mbps
Fast data rate.
Uses higher frequencies and is sometimes affected by obstructing objects,
but is resistant to noise as it uses a
frequency that is not usually shared
with other electronic equipment.
54Mbps
Fast data rate.
Compatible with 802.11b.
Low frequency band tends to be unaffected by obstructing objects. However, communication quality is inferior to
802.11a, as it uses a frequency that is
often shared with other electronic
equipment.
11Mbps
Technology is more affordable than
high-speed standards.
Low frequency band tends to be unaffected by obstructing objects. However, communication quality is inferior to
802.11a, as it uses a frequency that is
often shared with other electronic
equipment.
2.4GHz
IEEE
802.11b
Wireless LAN
Characteristics
Hub
Wired LAN (Ethernet)
Access point
Access point
Wireless LAN
(IEEE 802.11b)
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