www.cooperbussmann.com/wirelessresources
Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
101
Rev Version 2.19
DNS
Domain name service (DNS) is a program that translates URLs to IP addresses by
accessing a database maintained on a collection of Internet servers. The program works
behind the scenes to facilitate surfing the Web with alpha versus numeric addresses. A
DNS server converts a name like mywebsite.com to a series of numbers like 107.22.55.26.
Every website has its own specific IP address on the Internet.
DSL
Digital subscriber line (DSL) is a family of technology protocols for high-speed data, voice
and video transmission over ordinary twisted-pair copper plain old telephone service
(POTS) telephone wires.
Encryption Key
An alphanumeric (letters and/or numbers) series that enables data to be encrypted and
then decrypted so it can be safely shared among members of a network. WEP uses an
encryption key that automatically encrypts outgoing wireless data. On the receiving side,
the same encryption key enables the computer to automatically decrypt the information so
that it can be read. Encryption keys should be kept secret.
Firewall
A device or computer program that keeps unauthorized users out of a private network.
Everything entering or leaving a system’s internal network passes through the firewall and
must meet the system’s security standards in order to be transmitted. Often used to keep
unauthorized people from using systems connected to the Internet.
Hub
A multiport device used to connect PCs to a network via Ethernet cabling or via 802.11.
Wired hubs can have numerous ports and can transmit data at speeds ranging from
10 Mbps to multi-Gigabyte speeds per second. A hub transmits packets it receives to all
the connected ports. A small wired hub may only connect 4 computers; a large hub can
connect 48 or more.
Hz
Hertz. The international unit for measuring frequency, equivalent to the older unit of cycles-
per-second. One megahertz (MHz) is one million hertz. One gigahertz (GHz) is one billion
hertz. The standard US electrical power frequency is 60 Hz, the AM broadcast radio
frequency band is 535–605 kHz, the FM broadcast radio frequency band is 88–108 MHz,
and wireless 802.11b/g LANs operate at 2.4 GHz.
IEEE
Institute of Electrical and Electronics Engineers, New York, www.ieee.org. A membership
organization that includes engineers, scientists and students in electronics and allied fields.
IEEE has more than 300,000 members and is involved with setting standards for computers
and communications.
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.
