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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
Infrastructure Mode
An 802.11 setting providing connectivity to an access point. As compared to ad-hoc
mode, whereby 802.11 devices communicate directly with each other, clients set
in Infrastructure mode all pass data through a central AP. The AP not only mediates
wireless network traffic in the immediate neighborhood, but also provides
communication with the wired network.
I/O
Input/Output. The term used to describe any operation, program, or device that
transfers data to or from a computer.
Internet Appliance
A computer that is intended primarily for Internet access, is simple to set up, and
usually does not support installation of third-party software. These computers
generally offer customized Web browsing, touch-screen navigation, e-mail services,
entertainment, and personal information management applications.
IP
Internet Protocol. A set of rules used to send and receive messages across local
networks and the Internet.
IP Telephony
Technology that supports voice, data, and video transmission via IP-based LANs,
WANs, and the Internet. This includes VoIP (Voice over IP).
IP Address
A 32-bit number that identifies each sender or receiver of information that is
sent across the Internet. An IP address has two parts—an identifier of a particular
network on the Internet and an identifier of the particular device (a server or a
workstation) within that network.
IPX-SPX
Internetwork Packet Exchange (IPX) is a networking protocol used by the Novell
NetWare
®
operating systems. Like UDP/IP, IPX is a datagram protocol used for
connectionless communications. Higher-level protocols, such as Sequenced Packet
Exchange (SPX) and NCP, are used for additional error recovery services. SPX
is a transport layer protocol (layer 4 of the OSI Model) used in Novell Netware
networks. The SPX layer sits on top of the IPX layer (layer 3) and provides
connection-oriented services between two nodes on the network. SPX is used
primarily by client/server applications.
ISDN
A type of broadband Internet connection that provides digital service from the
customer’s premises to the dial-up telephone network. ISDN uses standard POTS
copper wiring to deliver voice, data, or video.
ISO Network Model
A network model developed by the International Standards Organization (ISO)
that consists of seven different levels, or layers. By standardizing these layers, and
the interfaces in between, different portions of a given protocol can be modified
or changed as technologies advance or systems requirements are altered. The
seven layers are Physical, Data Link, Network, Transport, Session, Presentation,
Application.
LAN
Local Area Network. A system of connecting PCs and other devices within the same
physical proximity for sharing resources such as an Internet connections, printers,
files, and drives.
Receive Sensitivity
The minimum signal strength required to pick up a signal. Higher bandwidth
connections usually have less receive sensitivity than lower bandwidth connections.
Router
A device that forwards data from one WLAN or wired local area network to another.
SNR
Signal to noise ratio (SNR) is the number of decibels difference between the signal
strength and background noise.
Transmit Power
The power at which the wireless devices transmits (usually expressed in mW or
dBm).