102
www.cooperbussmann.com/wirelessresources
Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
Rev Version 2.19
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).
MAC Address
Media Access Control (MAC) address is a unique code that is permanently assigned to
most forms of networking hardware. 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 (NAT) is 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 (NIC) is 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.
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 connectors have four.
Server
A computer that provides its resources to other computers and devices on a network.
These include print servers, Internet servers, and data servers. A server can also be
combined with a hub or router.
Site Survey
The process whereby a wireless network installer inspects a location prior to installing a
wireless network. Site surveys are used to identify the radio- and client-use properties of a
facility so that access points can be optimally placed.
SSL
Secure Sockets Layer (SSL) is an encryption scheme commonly used by many online retail
and banking sites to protect the financial integrity of transactions. When an SSL session
begins, the server sends its public key to the browser. The browser then sends a randomly
generated secret key back to the server in order to have a secret key exchange for that
session
Sub Network or Subnet
Found in larger networks, these smaller networks are used to simplify addressing between
numerous computers. Subnets connect together through a router.
