WI-MOD-E-100 & WI-MOD-E-300 Wireless Ethernet
User Manual
WI-MOD-E Manual v1.10
Page
86
DHCP
A utility that enables a server to dynamically assign IP addresses from a
predefined list and limit their time of use so that they can be reassigned. Without
DHCP, an IT Manager would have to manually enter in all the IP addresses of all
the computers on the network. When DHCP is used, whenever a computer logs
onto the network, it automatically gets an IP address assigned to it.
Dial-up
A communication connection via the standard telephone network, or Plain Old
Telephone Service (POTS).
DNS
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
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.
Firewall
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
WiFi. Wired hubs can have numerous ports and can transmit data at speeds
ranging from 10 Mbps to multigigabyte 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
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 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
