NS3000/iX NMMGR Screens Reference Manual - Edition 8 (36922-90038)

Glossary 343
Glossary
transport, network Software
that corresponds to layers 4 and 3
of the OSI network architecture
model. It sends data out over the
communications link, receives
incoming data, and routes
incoming or outgoing data to the
appropriate destination node.
TTUTIL Also known as the
Workstation Configurator. A
program, TTUTIL.PUB.SYS, on
the HP 3000 that is used to create
and modify terminal and printer
type files.
Tymnet A proprietary public
data network in the USA.
typeahead A facility that allows
terminal users to enter data
before a read is actually posted to
the terminal.
U
UPS See uninterruptible
power supply.
unacknowledged frame
number (K) The number of
frames that can be transmitted
without receiving an
acknowledgment from the
destination address. When this
number (K) frame is reached, the
same K frames are retransmitted.
unedited mode See
transparent mode.
uninterruptible power
supply A hardware device that
protects equipment from power
failures and contains an internal
storage battery to supply reserve
power.
V
V.24 The CCITT recommendation
that defines the function of the
interchange circuits between a
DTE and a DCE.
validation The process of
ascertainingwhether thenetwork
transport configuration file has
been correctly configured. In
guided NMMGR, you do this by
pressing the Validate Netxport
key.
VAN Value-Added Network. A
datacommunicationnetwork that
uses and pays for facilities
belonging to another carrier. The
value-added package is then sold
to a user.
VC See virtual circuit.
virtual circuit A logical
association between two
physically separate DTEs.
virtual terminal A network
service that allows a user to
establish interactive sessions on a
node.
VPLUS Software used to
generate screens such as those
displayed by NMMGR.