905U-E Wireless Ethernet Bridge
User Manual
Man_905U-E Rev 1.0
Page
34
A network device transmits data after detecting that a channel is available.
However, if two devices transmit data simultaneously, the sending devices
detect a collision and retransmit after a random time delay.
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