line-to-line voltage of 200-240 V ac.
Sometimes referred to as single phase
power.
U
Ultra SCSI
See Small Computer Systems Interface.
Ultra160 SCSI
See Small Computer Systems Interface.
Ultra2 SCSI
See Small Computer Systems Interface.
Ultra3 SCSI
See Small Computer Systems Interface.
Ultra320 SCSI
See Small Computer Systems Interface.
uniform resource locator (URL)
The address of an item on the World
Wide Web. It includes the protocol
followed by the fully qualified domain
name (sometimes called the host name)
and the request. The web server typically
maps the request portion of the URL to a
path and file name. For example, if the
URL is http://
www.networking.ibm.com/nsg/
nsgmain.htm, the protocol is http; the
fully qualified domain name is
www.networking.ibm.com; and the
request is /nsg/nsgmain.htm.
unload
Pertaining to the TS4500 tape library, a
term that is used to describe the act of the
drive unthreading the tape from the
internal tape path and returning the
leader block to the tape cartridge.
URL See uniform resource locator.
V
V Volt.
V ac Volts ac (alternating current).
vital product data (VPD)
Pertaining to the TS4500 tape library,
information about a product such as a
library, drive, or node card. The VPD
might include a machine type, model
number, serial number, part number, or
level of firmware.
void In character recognition, the inadvertent
absence of ink within a character outline.
VOLSER
Volume serial number.
VOLSER ranges
With the TS4500 tape library, a method
that is used to automatically assign
cartridges to a logical library by using
beginning and ending volume serial
number ranges that are set by the user.
See also Cartridge assignment policy.
volt The SI (international) unit of potential
difference and electromotive force,
formally defined to be the difference of
electric potential between two points of a
conductor that is carrying a constant
current of 1 ampere, when the power
dissipated between these points is equal
to 1 watt.
volume serial number (VOLSER)
A number that a computer assigns to a
tape cartridge when it prepares
(initializes) the cartridge for use.
VPD See vital product data.
W
W Watts.
watt A metric unit of measure of power; the
power that is required to keep a current
of 1 ampere flowing under a potential
drop of 1 volt; about 1/736 of 1
horsepower.
Web See World Wide Web.
wet bulb temperature
The temperature at which pure water
must be evaporated adiabatically at
constant pressure into a sample of air to
saturate the air under steady-state
conditions. Read from a wet-bulb
thermometer.
World Wide Node Name
In Fibre Channel technology, the fixed,
64-bit name that is assigned to a device
by its manufacturer and used to identify
participants in a topology. The World
Wide Node Name is unique if the
manufacturer registered a range of
addresses with the IEEE.
World Wide Port Name
Within a parent node, a unique 64-bit
name that is assigned to a node port. The
World Wide Port Name aids the
accessibility of the port.
Glossary 189
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