Weidmuller WI-MOD-945-E: 900Mhz Wireless Ethernet & Device Server v2.16 - Manual (Page 102)

Weidmuller Technologies Wireless Ethernet Modem & Device Server 945U-E User Manual
Page 102 www.weidmuller.com Rev 2.136
Dial-up A communication connection via the standard telephone network, or Plain Old Telephone
Service (POTS).
DNS Domain Name Service 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 Various technology protocols for high-speed data, voice and video
transmission over ordinary twisted-pair copper POTS (Plain Old Telephone Service)
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
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
—1605 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. It 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 AP. 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 neighbourhood, but also provides communication with the wired network. See
Ad-Hoc and AP.
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