Using the Node Management Services (NMS) Utilities (32022-90053)

Glossary 323
Glossary
passed with the token until they
arrive at the node to which they
are addressed.
Token Ring 3000/iX Network
Link Hardware and software
required to connect a HP 3000
Series 900 system to a token ring
network.
topology The physical
arrangement of nodes in a
network. Some common
topologies are bus, star, and ring.
transmission control protocol
A network protocol that
establishes and maintains
connections between nodes. TCP
regulates the flow of data, breaks
messages into smaller fragments
if necessary (and reassembles the
fragments at the destination),
detects errors, and retransmits
messages if errors have been
detected.
Transpac The national public
PSN of France.
transparent mode Data
transfer scheme in which only a
limited number of special
characters retain their meaning
and are acted on by the system.
All other characters are
considered to be data and are
passed through with no control
actions being taken.
transport, network Software
that corresponds to layers 4 and 3
of the OSI network architecture
model. The function of this
software is to send data out over
the appropriate communications
link, to receive incoming data,
and to route incoming or outgoing
data to the appropriate
destination node.
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
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.
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.