Westermo RM-80 - Manual (Page 53)

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IPX-SPX IPX, short for Internetwork Packet Exchange, a networking proto-
col used by the Novell NetWare operating systems. Like UDP/IP,
IPX is a datagram protocol used for connectionless communica-
tions. Higher-level protocols, such as SPX and NCP, are used for
additional error recovery services. Sequenced Packet Exchange,
SPX, 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. Whereas the IPX protocol is similar to IP, SPX is simi-
lar to TCP. Together, therefore, IPX-SPX provides connection serv-
ices similar to TCP/IP.
ISA A type of internal computer bus that allows the addition of card-
based components like modems and network adapters. ISA has been
replaced by PCI and is not very common anymore.
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 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 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. The number of decibels difference between the
signal strength and background noise.
Transmit Power The power usually expressed in mW or db that the wireless device
transmits at.