Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-E-G/A User Manual
Rev.
2.16
www.weidmuller.com
98
server or a workstation) within that network.
IPX-SPX
Internetwork Packet Exchange, 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 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.
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. The number of decibels
difference between the signal strength and
background noise.
Transmit Power
The power usually expressed in mW or dBm that
the wireless device transmits at.
MAC Address
Media Access Control address. A unique code
assigned to most forms of networking hardware.
The address is permanently assigned to the
hardware, so limiting a wireless network's access
to hardware -- such as wireless cards -- is a
security feature employed by closed wireless
networks. But an experienced hacker -- armed with
the proper tools -- can still figure out an authorized
MAC address, masquerade as a legitimate address
and access a closed network.
Every wireless 802.11 device has its own specific
MAC address hard-coded into it. This unique
identifier can be used to provide security for
wireless networks. When a network uses a MAC
table, only the 802.11 radios that have had their
MAC addresses added to that network's MAC table
will be able to get onto the network.
NAT
Network Address Translation: A network capability
that enables a number of computers to dynamically
share a single incoming IP address from a dial-up,
cable or xDSL connection. NAT takes the single
incoming IP address and creates new IP address
for each client computer on the network.
NIC
Network Interface Card. A type of PC adapter card
that either works without wires (Wi-Fi) or attaches
to a network cable to provide two-way
communication between the computer and network
devices such as a hub or switch. Most office wired
NICs operate at 10 Mbps (Ethernet), 100 Mbps
(Fast Ethernet) or 10/100 Mbps dual speed. High-
speed Gigabit and 10 Gigabit NIC cards are also
available. See PC Card.
Proxy Server
Used in larger companies and organizations to
improve network operations and security, a proxy
server is able to prevent direct communication
between two or more networks. The proxy server
forwards allowable data requests to remote servers
and/or responds to data requests directly from
stored remote server data.
RJ-45
Standard connectors used in Ethernet networks.
RJ-45 connectors are similar to standard RJ-11
telephone connectors, but RJ-45 connectors can
have up to eight wires, whereas telephone
