Appendix B: Glossary - aqprox appPCI300 Guía De Usuario

300Mbps Wireless N PCI Adapter – APPPCI300

Appendix B: Glossary

802.11b - The 802.11b standard specifies a wireless product networking at 11 Mbps using
direct-sequence spread-s
spectrum at 2.4GHz, and
as Wi-Fi networks.
802.11g - specification for wireless networking at 54 Mbps using direct-sequence
spread-spectrum (DSSS
unlicensed radio spectrum at
and WEP encryption for security.
Ad-hoc Network - An ad-hoc network is a group of computers, each with a Wireless Adapter,
connected as an indepen
peer-to-peer basis, communicating dir
Ad-hoc mode is also re
peer-to-peer mode, and is
DSSS - (Direct-Sequence
data transmitted. This bit pattern is called a chip (or chipping code). Even if one or more bits
in the chip are damaged d
can recover the original d
DSSS appears as low power wi
receivers. H owever, to an
signal is recognized as the only valid signal, and interference is inherently rejected (ignored).
FHSS - (Frequency Hopp
carrier frequency of a
m set of c
pseudo-rando
transmitter and receiver know the hop patterns, interception of FHSS is extremely difficult.
Infrastructure Net
each with a Wireless
the wireless devices communicate with each other and to a wired network by first going
through an access point. An infrastructure wireless network connected to a wired network is
referred to as a Basic Service Set (BSS).
referred to as an Extended Se
scale, or when it i s neces
Spread Spectr um - Spre
developed by the military for use in reliable, secure, mission-critical communications systems.
It is designed to tr ade of
words, more bandwidth is consumed than in the case of narrowband transmission, but the
trade off produces
receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is
not tuned to the right frequency, a spread-spectrum signal looks like background noise.
There are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency
Hopping Spread Spectrum (FHSS).
User's Guide
pectrum (DSSS) technology and operating in the unlicensed radio
WEP encryption for s
) technology, using OFDM modulation and operating in
2.4GHz, and backward compatibility with IEEE 802.11b devices,
dent 802.11 wireless LAN. Ad-hoc wireles
ectly with each other with
ferred to as an Independent Basic Service Set (IBSS) or
useful at a departmental scale or S
Spread Spectrum
uring transmission, st
ata without the need of r
deband noise and i
intended receiver
ing Spread Spectrum)
conventional carrier
hannels. Because a fixed frequency is not
work - An infrastructure network is a group of computers or other devi
Adapter, connected as an 802.11 wireless LAN. In infrastructure mode,
rvice Set (ESS). Infrastructure mode is useful at a corporation
sary to connect the wired
ad Spectrum technology is a wideband radio fre
f bandwidth efficiency for reli
a signa l that is, in effect, louder and thus e
ecurity. 802.11b networks are also referred to
out the use of an access point.
OHO operation.
) - DSSS generates a redundant bit pattern for all
atistical techniques embedded in the receiver
etransmission. To an unintended receiver,
s rejected (ignored) by most narrowband
(i.e. another wireless LAN endpoint), the DSSS
- FHSS continuously changes (hops) the
several times per second according to a
A set of two or more BSS in a single network is
and wireless networks.
ability, integrity, and security. In other
asier to detect, provided that the
English
the
s computers operate on a
used, and only the
ces,
quency technique
73
as