Changes between Initial Version and Version 1 of Definizioni

Timestamp:

Oct 28, 2006, 2:42:52 PM (18 years ago)

Author:

soujak

Comment:

Iniziata la presente pagina, riformattazione completa della prima parte di Definitions?

Definizioni

@@ +1 @@
+= Definizioni =
+[[PageOutline(3,Indice)]]
+=== Access control ===
+The prevention of unauthorized usage of resources.
+
+=== Access point (AP) ===
+Any entity that has station functionality and provides access to the
+distribution services, via the wireless medium (WM) for associated stations.
+
+=== Ad hoc network ===
+A network composed solely of stations within mutual communication range of each
+other via the wireless medium (WM). An ad hoc network is typically created in a
+spontaneous manner. The principal distinguishing characteristic of an ad hoc
+network is its limited temporal and spatial extent. These limitations allow the
+act of creating and dissolving the ad hoc network to be sufficiently
+straightforward and convenient so as to be achievable by nontechnical users of
+the network facilities; i.e., no specialized "technical skills" are required
+and little or no investment of time or additional resources is required beyond
+the stations that are to participate in the ad hoc network. The term ad hoc is
+often used as slang to refer to an independent basic service set (IBSS).
+
+=== Association ===
+The service used to establish access point/station (AP/STA) mapping and enable
+STA invo-cation of the distribution system services (DSSs).
+
+=== Authentication ===
+The service used to establish the identity of one station as a member of the set
+of stations authorized to associate with another station.
+
+=== Basic service area (BSA) ===
+The conceptual area within which members of a basic service set (BSS) may
+communicate.
+
+=== Basic service set (BSS) ===
+A set of stations controlled by a single coordination function.
+
+=== Basic service set (BSS) basic rate set ===
+The set of data transfer rates that all the stations in a BSS will be
+capable of using to receive frames from the wireless medium (WM). The BSS basic
+rate set data rates are preset for all stations in the BSS.
+
+=== Broadcast address ===
+A unique multicast address that specifies all stations.
+
+=== Channel ===
+An instance of medium use for the purpose of passing protocol data units (PDUs)
+that may be used simultaneously, in the same volume of space, with other
+instances of medium use (on other channels) by other instances of the same
+physical layer (PHY), with an acceptably low frame error ratio due to mutual
+interference. Some PHYs provide only one channel, whereas others provide
+multiple channels.
+
+=== Clear channel assessment (CCA) function ===
+That logical function in the physical layer (PHY) that determines the current
+state of use of the wireless medium (WM).
+
+=== Confidentiality ===
+The property of information that is not made available or disclosed to
+unauthorized individuals, entities, or processes.
+
+=== Coordination function ===
+The logical function that determines when a station operating within a basic
+service set (BSS) is permitted to transmit and may be able to receive protocol
+data units (PDUs) via the wire-less medium (WM). The coordination function
+within a BSS may have one point coordination function (PCF) and will have one
+distributed coordination function (DCF).
+
+=== Coordination function pollable ===
+A station able to (1) respond to a coordination function poll with a
+data frame, if such a frame is queued and able to be generated, and (2)
+interpret acknowledgments in frames sent to or from the point coordinator.
+
+=== Deauthentication ===
+The service that voids an existing authentication relationship.
+
+=== Directed address ===
+See: [wiki:Definizioni#Unicastframe Unicast frame].
+
+=== Disassociation ===
+The service that removes an existing association.
+
+=== Distributed coordination function (DCF) ===
+A class of coordination function where the same coordination function logic is
+active in every station in the basic service set (BSS) whenever the network is
+in operation.
+
+=== Distribution ===
+The service that, by using association information, delivers medium access
+control (MAC) service data units (MSDUs) within the distribution system (DS).
+
+=== Distribution system (DS) ===
+A system used to interconnect a set of basic service sets (BSSs) and integrated
+local area networks (LANs) to create an extended service set (ESS).
+
+=== Distribution system medium (DSM) ===
+The medium or set of media used by a distribution system (DS) for communications
+between access points (APs) and portals of an extended service set (ESS).
+
+=== Distribution system service (DSS) ===
+The set of services provided by the distribution system (DS) that enable the
+medium access control (MAC) to transport MAC service data units (MSDUs) between
+stations that are not in direct communication with each other over a single
+instance of the wireless medium (WM).[[BR]]
+These services include transport of MSDUs between the access points (APs) of
+basic service sets (BSSs) within an extended service set (ESS), transport of
+MSDUs between portals and BSSs within an ESS, and transport of MSDUs between
+stations in the same BSS in cases where the MSDU has a multicast or broad-cast
+destination address or where the destination is an individual address, but the
+station sending the MSDU chooses to involve DSS. DSSs are provided between pairs
+of IEEE 802.11 MACs.
+
+=== Extended rate set (ERS) ===
+The set of data transfer rates supported by a station (if any) beyond the
+extended service set (ESS) basic rate set. This set may include data transfer
+rates that will be defined in future physical layer (PHY) standards.
+
+=== Extended service area (ESA) ===
+The conceptual area within which members of an extended service set
+(ESS) may communicate. An ESA is larger than or equal to a basic service area
+(BSA) and may involve several basic service sets (BSSs) in overlapping,
+disjointed, or both configurations.
+
+=== Extended service set (ESS) ===
+A set of one or more interconnected basic service sets (BSSs) and inte-grated
+local area networks (LANs) that appears as a single BSS to the logical link
+control layer at any station associated with one of those BSSs.
+
+=== Gaussian frequency shift keying (GFSK) ===
+A modulation scheme in which the data is first filtered by a Gaussian filter in
+the baseband and then modulated with a simple frequency modulation.
+
+=== Independent basic service set (IBSS) ===
+A BSS that forms a self-contained network, and in which no access to a
+distribution system (DS) is available.
+
+=== Infrastructure ===
+The infrastructure includes the distribution system medium (DSM), access point
+(AP), and portal entities. It is also the logical location of distribution and
+integration service functions of an extended service set (ESS). An
+infrastructure contains one or more APs and zero or more portals in addition
+to the distribution system (DS).
+
+=== Integration ===
+The service that enables delivery of medium access control (MAC) service data
+units (MSDUs) between the distribution system (DS) and an existing, non-IEEE
+802.11 local area network (via a portal).
+
+=== Medium access control (MAC) management protocol data unit (MMPDU) ===
+The unit of data exchanged between two peer MAC entities to implement the MAC
+management protocol.
+
+=== Medium access control (MAC) protocol data unit (MPDU) ===
+The unit of data exchanged between two peer MAC entities using the services of
+the physical layer (PHY).
+
+=== Medium access control (MAC) service data unit (MSDU) ===
+Information that is delivered as a unit between MAC service access points
+(SAPs).
+
+=== Minimally conformant network ===
+An IEEE 802.11 network in which two stations in a single basic service area
+(BSA) are conformant with ISO/IEC 8802-11: 1999.
+
+=== Mobile station ===
+A type of station that uses network communications while in motion.
+
+=== Multicast ===
+A medium access control (MAC) address that has the group bit set. A multicast
+MAC service data unit (MSDU) is one with a multicast destination address. A
+multicast MAC protocol data unit (MPDU) or control frame is one with a multicast
+receiver address.
+
+=== Network allocation vector (NAV) ===
+An indicator, maintained by each station, of time periods when transmission onto
+the wireless medium (WM) will not be initiated by the station whether or not the
+station’s clear channel assessment (CCA) function senses that the WM is busy.
+
+=== Point coordination function (PCF) ===
+A class of possible coordination functions in which the coordination function
+logic is active in only one station in a basic service set (BSS) at any given
+time that the network is in operation.
+
+=== Portable station ===
+A type of station that may be moved from location to location, but that only
+uses net-work communications while at a fixed location.
+
+=== Portal ===
+The logical point at which medium access control (MAC) service data units
+(MSDUs) from a non-IEEE 802.11 local area network (LAN) enter the distribution
+system (DS) of an extended service set (ESS).
+
+=== Privacy ===
+The service used to prevent the content of messages from being read by other
+than the intended recipients.
+
+=== Reassociation ===
+The service that enables an established association [between access point (AP)
+and station (STA)] to be transferred from one AP to another (or the same) AP.
+
+=== Station (STA) ===
+ Any device that contains an IEEE 802.11 conformant medium access control (MAC)
+and physical layer (PHY) interface to the wireless medium (WM).
+
+=== Station basic rate ===
+A data transfer rate belonging to the extended service set (ESS) basic rate set
+that is used by a station for specific transmissions. The station basic rate may
+change dynamically as frequently as each medium access control (MAC) protocol
+data unit (MPDU) transmission attempt, based on local considerations at that
+station.
+
+=== Station service (SS) ===
+The set of services that support transport of medium access control (MAC)
+service data units (MSDUs) between stations within a basic service set (BSS).
+
+=== Time unit (TU) ===
+A measurement of time equal to 1024 µs.
+
+=== Unauthorized disclosure ===
+The process of making information available to unauthorized individuals,
+entities, or processes.
+
+=== Unauthorized resource use ===
+Use of a resource not consistent with the defined security policy.
+
+=== Unicast frame ===
+A frame that is addressed to a single recipient, not a broadcast or multicast
+frame. Syn: [wiki:Definizioni#Directedaddress Direct sddress].
+
+=== Wired equivalent privacy (WEP) ===
+The optional cryptographic confidentiality algorithm specified by IEEE 802.11
+used to provide data confidentiality that is subjectively equivalent to the
+confidentiality of a wired local area network (LAN) medium that does not employ
+cryptographic techniques to enhance privacy.
+
+=== Wireless medium (WM) ===
+The medium used to implement the transfer of protocol data units (PDUs) between
+peer physical layer (PHY) entities of a wireless local area network (LAN).
+
+ ,,Copyright © 1999 IEEE. All rights reserved.,,