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Glossary 269
URL
Uniform Resource Locator. A standard way of
specifying the location of an object, such as an HTML
document, on the Internet. Examples of URLs
include the following:
• http://www.dell.com
• http://support.dell.com
• ftp.dell.com
• mailto:info@dell.com
The part before the first colon specifies the access
scheme or protocol. Commonly implemented
schemes include FTP and http. The part after the
colon is interpreted according to the access scheme
and can introduce an IP address, indicate a path or
file on a server, or locate a particular position within
a specified document.
USB
Universal Serial Bus. An interface for devices such as
keyboards, joysticks, scanners, speakers, or printers,
that provides a maximum transfer speed of
12 Mb/second. Devices plug directly into a four-pin
connector on your computer or into a multiport hub
that connects to your computer. USB is hot-
swappable, and up to 127 devices can be connected
in daisy-chain manner.
UTP
Unshielded twisted pair. A common type of copper
wiring used for telephone systems and Ethernet
networks. To reduce electromagnetic induction
between pairs of wires, sometimes called "crosstalk,"
two insulated copper wires are wound around each
other to form a "twisted pair." See also STP.
V
Volt. A measurement of electric potential and
electromotive force. If one volt is applied to a
resistance of one ohm, a current of one ampere will
flow across the resistance.
VAC
Volt(s) alternating current (AC).
VDC
Volt(s) direct current (DC).
VRM
Voltage regulator module. A component installed on
the system board that senses the voltage
requirements for a microprocessor and ensures that
the correct voltage is maintained.
W
Watt. A measurement of electrical power that equals
1 ampere of current flowing at 1 volt.
WBEM
Web-Based Enterprise Management. A set of systems
management and Internet standard technologies
developed to unify the management of computing
environments. The core set of WBEM standards,
developed by DMTF, include a data model, the CIM
standard, a coding specification, and an http
transport mechanism.
WfM
Wired for management. A specification developed by
Intel to improve the manageability of desktop,
mobile, and server computers. WfM defines software,
hardware, and other capabilities that enhance
computer network operations and reduce support
costs by allowing remote management application
programs to access client computers over a network.
WfM technology is used in a client computer, in such
components as circuitry, power supply, network
adapter, and so on. Remote management application
programs can use WfM technology to access a client
computer and gather information about it, monitor
its status, or change its operational state. WfM
standards include DMI, PXE, and Remote Wake Up.
WfM is also compatible with current and emerging
industry specifications, such as ACPI, CIM,
SMBIOS, SNMP, and WBEM.
WOL
Wake-on LAN. Technology that allows a computer on
a network to be remotely turned on or awakened from