B&B Electronics WLNN-AN(ER,SE,SP.EK)-DP551 - Manual - Manual (Page 261)

Airborne Enterprise CLI Reference Manual 261
Local Area Network A system of connecting PCs and other devices within the same physical
proximity for sharing resources such as Internet connections, printers, files,
and drives. When Wi-Fi is used to connect the devices, the system is known
as a wireless LAN or WLAN.
Media Access
Control (MAC) Layer One of two sub-layers that make up the Data Link Layer of the OSI reference
model. The MAC layer is responsible for moving data packets to and from
one network node to another across a shared channel.
MPDU MAC Protocol Data Unit, the unit of data exchanged between two peer MAC
entities using the services of the physical layer (PHY).
MSDU MAC Service Data Unit, information that is delivered as a unit between MAC
service Access Points (SAPs).
Peer-to-peer network A wireless or wired computer network that has no server, central hub, or
router. All the networked PCs are equally able to act as a network server or
client, and each client computer can talk to all the other wireless computers
without having to go through an Access Point or hub. However, since there is
no central base station to monitor traffic or provide Internet access, the
various signals can collide with each other, reducing overall performance.
PSK Pre-Shared Key and is used in authentication. This is a shared key between
the station and the AP and is entered as a passphrase.
RADIUS Remote Authentication Dial In User Service. A backend server that performs
authentication using Extensible Authentication Protocol (EAP). This server is
required by the IEEE 802.1X security standard.
RS-232 An EIA standard that specifies up to 20 Kbps, 50 foot serial transmission
between computers and peripheral devices.
RTOS An operating system implementing components and services that explicitly
offer deterministic responses, and therefore allow the creation of real-time
systems. An RTOS is characterized by the richness of the services it
provides, the performance characteristics of those services, and the degree
that those performance characteristics can be controlled by the application
engineer
(to satisfy the requirements of the application).
Service Set Identifier
(SSID) An identifier attached to packets sent over the wireless LAN that functions as
a "password" for joining a particular radio network (BSS). All radios and
Access Points within the same BSS must use the same SSID or their
packets will be ignored.
SPI Short for Serial Peripheral Interface, a full-duplex serial interface for
connecting external devices using four wires. SPI devices communicate
using a master/slave relationship over two data lines and two control lines.
Supplicant The entity being authenticated by the authenticator and desiring access to
the services of the authenticator.
Telnet A virtual terminal protocol used (e.g., with the Internet) to enable users to log
into a remote Host.
TKIP Temporal Key Integrity Protocol and is used in encryption. TKIP is an IEEE
802.11i standard and an enhancement to WEP security.
Transceiver A device for transmitting and receiving packets between the computer and
the medium.
Transmission Control
Protocol (TCP) A commonly used protocol for establishing and maintaining communications
between applications on different computers. TCP provides full-duplex,
acknowledged, and flow-controlled service to upper-layer protocols and
applications.
UDP Short for User Datagram Protocol, UDP is a connectionless protocol that, like
TCP, runs on top of IP networks. Unlike TCP/IP, UDP/IP provides very few
error recovery services, offering instead a direct way to send and receive
datagrams over an IP network. It's used primarily for broadcasting messages
or sending streaming data (e.g., video) over a network.
Wide Area Network
(WAN) A communication system of connecting PCs (and other computing devices)
across a large local, regional, national, or international geographic area. Also
used to distinguish between phone-based data networks and Wi-Fi. Phone
networks are considered WANs and Wi-Fi networks are considered wireless
LANs.
Wi-Fi Wi-Fi is a name for 802.11 wireless network technologies.
Wi-Fi Alliance A non-profit international association formed in 1999 to certify interoperability
of wireless LAN products based on the IEEE 802.11 specification.
Wired Equivalent
Privacy (WEP) A security protocol for wireless LANs defined in the IEEE 802.11 standard.
WEP is designed to provide the same level of security as a wired LAN.
WLAN Also referred to as a wireless LAN. A type of local-area network that uses
high-frequency radio waves rather than wires to communicate between
nodes and provide network connectivity.
WLN Short for Wireless LAN Node, this is the Ai rborne™ Module that provides
802.11 LAN connectivity.