Multilaser RE025 Manual Del Usuario página 42

• FHSS - (Frequency Hopping Spread Spectrum) - FHSS continuously changes (hops) the carrier fre-
quency of a conventional carrier several times per second according to a pseudo-random set of channels.
Because a fixed frequency is not used, and only the transmitter and receiver know the hop patterns, inter-
ception of FHSS is extremely difficult.
• Infrastructure Network - An infrastructure network is a group of computers or other devices, each with
a Wireless Adapter, connected as an 802.11 wireless LAN. In infrastructure mode, the wireless devices
communicate with each other and to a wired network by first going through an access point. An infras-
tructure wireless network connected to a wired network is referred to as a Basic Service Set (BSS). A set
of two or 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 ne-
tworks.
• 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 consu-
med 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).
• SSID - A Service Set Identification 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 wire-
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less 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.
• WEP - (Wired Equivalent Privacy) - 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 determi-
ne 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 cha-
racters) 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.
• 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 interope-
rability among 802.11b devices.
• WLAN - (Wireless Local Area Network) - A group of computers and associated devices communicate
with each other wirelessly, which network serving users are limited in a local area.
• WPA - (Wi-Fi Protected Access) - A wireless security protocol uses TKIP (Temporal Key Integrity Proto-
col) encryption, which can be used in conjunction with a RADIUS server
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