Weidmuller WI-MOD-945-E: 900Mhz Wireless Ethernet & Device Server v2.16 - Manual (Page 103)

Weidmuller Technologies Wireless Ethernet Modem & Device Server 945U-E User Manual
Page 103 www.weidmuller.com Rev 2.136
the Internet. An IP address has two parts: an identifier of a particular network on the
Internet and an identifier of the particular device (which can be a 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