Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

Glossary
terminal type
Glossary
128128
type, line speed, device class assignment, and other
values relevant to terminals connected through a
DTC.
terminal type A collection of characteristics that
cause a terminal connected to an MPE/iX system to
act and react in a specified manner. You can
configure a terminal to use one of the
system-supplied terminal types, or you can create
custom terminal types using the Workstation
Configurator.
ThinLAN 3000/iX A LAN that conforms to the
IEEE 802.3 Type 10 BASE 2 standard LAN.
throughput class A value assigned to a given
virtual circuit that defines how many network
resources should be assigned to a given call. It is
determined by the access line speed, packet and
window sizes, and the local network’s internal
mechanisms.
throughput class negotiation One of the
Network Subscribed Facilities defined at
subscription time. This allows the user to negotiate
the Throughput Class at call set-up time.
timer (T3) The length of time that a link can
remain in an idle state. After the expiration of the
timer, the link is considered to be in a non-active,
non-operational state and is automatically reset.
The value should be chosen carefully. In particular, it
must be sufficiently greater than the
Retransmission Timer (T1) so that no doubt exists
about the link’s state.
topology The physical arrangement of nodes in a
network. Some common topologies are bus, star, and
ring.
Transmission Control Protocol TCP. 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 TCP. The national public PSN of France.
transparent mode A 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 3 and 4 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.
TS8 See HP TS8.
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
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
V24 The CCITT recommendation that defines the
function of the interchange circuits between a DTE
and a DCE.
validation The process of ascertaining whether the
network transport configuration file has been
correctly configured. This is accomplished by using
the NMMGR Validate Configuration File screen
VAN Value-Added Network. A data communication
network that uses and pays for facilities belonging to
another carrier. The value-added package is then
sold to a user.
VC See virtual circuit.