Corinex Global ADSL2+ - Manual (Page 137)

136
Appendices
Corinex ADSL2+ Wireless Gateway G
provide sequencing of the packets that the data arrives in. This means that the
application program that uses UDP must be able to make sure that the entire mes-
sage has arrived and is in the right order. Network applications that want to save
processing time because they have very small data units to exchange (and therefore
very little message reassembling to do) may prefer UDP to TCP.
Upgrade - To replace existing software or firmware with a newer version.
Upload - To send a file transmitted over a network. In a communications session,
upload means transmit, and download means receive.
URL (Uniform Resource Locator) - The address that defines the route to a file
on the Web or any other Internet facility. URLs are typed into the browser to access
Web pages, and URLs are embedded within the pages themselves to provide the
hypertext links to other pages.
UTP - Unshielded twisted pair is the most common kind of copper telephone
wiring. Twisted pair is the ordinary copper wire that connects home and many busi-
ness computers to the telephone company. To reduce crosstalk or electromagnetic
induction between pairs of wires, two insulated copper wires are twisted around
each other. Each signal on twisted pair requires both wires. Since some telephone
sets or desktop locations require multiple connections, twisted pair is sometimes
installed in two or more pairs, all within a single cable.
VLAN (Virtual LAN) - A logical association that allows users to communicate as if
they were physically connected to a single LAN, independent of the actual physical
configuration of the network.
Virtual Server - Multiple servers that appear as one server, or one system image,
to the operating system or for network administration.
VPN (Virtual Private Network) - A security measure to protect data as it leaves
one network and goes to another over the Internet.
WAN - A communications network that covers a wide geographic area, such as a
state or country.
WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-bit
shared key algorithm, as described in the IEEE 802.11 standard.