iB-WPA300N
300M MIMO Wireless-N PCI-E Adapter
37
more BSS in a single network is referred to as an Extended Service Set (ESS).
Infrastructure mode is useful at a corporation scale, or when it is necessary to connect
the wired and wireless networks.
¾
Spread Spectrum -
Spread Spectrum technology is a wideband radio frequency
technique developed by the military for use in reliable, secure, mission-critical
communications systems. It is designed to trade off bandwidth efficiency for reliability,
integrity, and security. In other words, more bandwidth is consumed than in the case of
narrowband transmission, but the trade off produces a signal that is, in effect, louder and
thus easier to detect, provided that the 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).
¾
SSID -
A
S
ervice
S
et
Id
entification is a thirty-two character (maximum) alphanumeric key
identifying a wireless local area network. For the wireless devices in a network to
communicate with each other, all devices must be configured with the same SSID. This
is typically the configuration parameter for a wireless PC card. It corresponds to the
ESSID in the wireless Access Point and to the wireless network name.
See also
Wireless
Network Name and ESSID.
¾
WEP -
(
W
ired
E
quivalent
P
rivacy)
-
A data privacy mechanism based on a 64-bit or
128-bit or 152-bit shared key algorithm, as described in the IEEE 802.11 standard. To
gain access to a WEP network, you must know the key. The key is a string of characters
that you create. When using WEP, you must determine the level of encryption. The type
of encryption determines the key length. 128-bit encryption requires a longer key than
64-bit encryption. Keys are defined by entering in a string in HEX (hexadecimal - using
characters 0-9, A-F) or ASCII (American Standard Code for Information Interchange –
alphanumeric characters) format. ASCII format is provided so you can enter a string that
is easier to remember. The ASCII string is converted to HEX for use over the network.
Four keys can be defined so that you can change keys easily.
¾
Wi-Fi -
A trade name for the 802.11b wireless networking standard, given by the
Wireless Ethernet Compatibility Alliance (WECA, see http://www.wi-fi.net), an industry
standards group promoting interoperability among 802.11b devices.
¾
WLAN -
(
W
ireless
L
ocal
A
rea
N
etwork) - A group of computers and associated devices
communicate with each other wirelessly, which network serving users are limited in a
local area.
¾
WPA -
(
W
i-Fi
P
rotected
A
ccess)
-
A wireless security protocol uses TKIP (Temporal Key
Integrity Protocol) encryption, which can be used in conjunction with a RADIUS server.
