User manual

Point Coordination Function (PCF)
An IEEE 802.11 mode that enables contention-free frame transfer based on a
priority mechanism. Enables time-bounded services that support the transmission
of voice and video.
Preamble
In Ethernet, a 64-bit pattern of alternating 1’s and 0’s, ending in two 1’s, to
synchronize transceivers and indicate the start of data.
Quadrature Phase Shift Keying (QPSK)
A modulation technique that changes the phase of a signal to represent different,
four-bit binary words.
Radio Frequency (RF) Terms: GHz, MHz, Hz
The international unit for measuring frequency is Hertz (Hz), which is equivalent to
the older unit of cycles per second. One Mega-Hertz (MHz) is one million Hertz.
One Giga-Hertz (GHz) is one billion Hertz. For reference: the standard US electrical
power frequency is 60 Hz, the AM broadcast radio frequency band is 0.55 -1.6
MHz, the FM broadcast radio frequency band is 88-108 MHz, and microwave ovens
typically operate at 2.45 GHz.
Roaming
Movement of a wireless node between two micro cells. Roaming usually occurs in
infrastructure networks built around multiple access points.
Shared key authentication
A type of authentication that assumes each station has received a secret shared
key through a secure channel independent from an 802.11 network. Stations
authenticate through shared knowledge of the secret key. Use of shared key
authentication requires implementation of the 802.11 WEP algorithms.
Wired Equivalent Privacy (WEP)
An optional IEEE 802.11 function that offers frame transmission similar to a wired
network. The WEP generates secret shared encryption keys that both source and
destination stations can use to alter frame bits to avoid disclosure to
eavesdroppers.
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